Author Topic: CCENT Questions and Answers  (Read 3937 times)

Offline certforumz

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CCENT Questions and Answers
« on: September 08, 2013, 02:20:42 AM »
CCENT Questions and Answers

http://www.certexams.com/cisco/ccent/exam-details.htm

A catalyst switch must be in which VTP mode in order to delete and add VLANs to a management domain?

a. Server
b. Designated
c. Client
d. Domains
e. Transparent

ans.

2. Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?

a.  network
b. session
c. transport
d. presentation
e application

Ans.

3. How many bits are used for a MAC address and how is number expressed?

a.  48 bits expression as a decimal number
b. 24 bits expression as a decimal number
c. 24 bits expression as a hexadecimal number
d. 36 bits expression as a binary number
e. 48 bits expression as a hexadecimal number

4. Which command will provide you with information regarding the Layer 3 configuration of directly
connected router interfaces?

a. show ip route
b. show ip interface
c. show cdp neighbors detail
d. show ip link status
e. show cdp neighbors
f. telnet

5. What are three reasons that an organization with multiple branch offices and roaming users might implement a Cisco VPN solution instead of point-to-point WAN links? (Choose three.)

a. better throughput
b. reduced cost
c. broadband incompatibility
d. reduced latency
ie. ncreased security
f. scalability

6. A network administrator is explaining VTP configuration to a new technician. What should the network administrator tell the new technician about VTP configuration? (Choose three.)

a.  A switch in the VTP server mode can update a switch in the VTP transparent mode
b. A switch in the VTP server mode will update switches in the VTP client mode regardless of the configured VTP domain membership
c. A switch in the VTP server mode only updates switches in the VTP client mode that have a higher VTP revision number
d. A switch in the VTP transparent mode will forward updates that it receives to other switches
e. A trunk link must be configured between the switches to forward VTP updates
f. A switch in the VTP client mode cannot update its local VLAN database

7. Your trainee Ellen is studying the basic of distance vector and link state routing protocols.
As her mentor, what could you tell her? (Choose two)

a.  Link state protocols send the entire routing table to all routers in the network.
b. Distance vector protocols send the entire routing table to directly connected neighbors.c.
c. Distance vector protocols send updates about directory connected neighbors to all networks listed in the routing table.
d. Link state protocols send updates containing the state of their own links to all other routers on the network.

8. A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?

a.  the OSPF route
b.  the RIPv2 route
c.  the EIGRP route
d.  the OSPF and RIPv2 routes
e.  all three routes

9. Which statement is correct regarding the operation of DHCP?

a.  If an address conflict is detected, the address is removed from the pool and will not be reused until the server is rebooted.
b. If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
c. If an address conflict is detected, the address is removed from the pool for an amount of time configurable by the administrator.
d. A DHCP client uses a ping to detect address conflicts.
e. A DHCP server uses a gratuitous ARP to detect DHCP clients.
f. A DHCP client uses a gratuitous ARP to detect a DHCP server.

10. An administrator must assign static IP addresses to the servers in a network. For network 192.168.20.24/29, the router is assigned the first usable host address while the sales server is given the last usable host address. Which of the following should be entered into the IP properties box for the sales server?

a. IP address: 192.168.20.30 Subnet Mask: 255.255.255.240 Default Gateway: 192.168.20.17
b. IP address: 192.168.20.30 Subnet Mask: 255.255.255.240 Default Gateway: 192.168.20.25
c. IP address: 192.168.20.254 Subnet Mask: 255.255.255.0 Default Gateway: 192.168.20.1
d. IP address: 192.168.20.14 Subnet Mask: 255.255.255.248 Default Gateway: 192.168.20.9
e. IP address: 192.168.20.30 Subnet Mask: 255.255.255.248 Default Gateway: 192.168.20.25

ans.

11. What command will configure an interface on a Catalyst 2960 series switch to carry traffic from all VLANs to another directly connected switch? (Choose two)

a. Switch(config-if)# switchport mode trunk
b. Switch(config-if)# switchport access vlan all
c. Switch(config-if)# switchport access vlan 30
d. Switch(config-if)# switchport trunk encapsulation dot1q
e/ Switch(config-if)# vlan all

12. What are options for Frame LMI types. (Choose three)

a. IETF
b. Q933a
c. Q.931
d. Cisco
e. IEEE
f. ANSI

13. Your trainee Jose is interested in ACLs (access control lists). He asks you want they can be used for. What should you tell him? (Choose three)

a. Classify network traffic.
b. Protect hosts from viruses
c. Provide high network availability.
d. Monitor the number of bytes and packets.
e. Identify interesting traffic for DDR.
f. IP route filtering.

Ans.

14. Which form of NAT maps multiple private IP addresses to a single registered IP address by using different ports?

a. port loading
b. static NAT
c. overlapping
d. dynamic NAT
e. overloading

Ans.

15. Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)

a. MAC address
b. IP address
c, IOS version
d. speed of the links
e. bridge priority
f. amount of RAM


16. For what purpose does Frame Relay use DLCIs?

a. They identify the logical circuit between a local router and a Frame Relay WAN switch
b. They determine the Frame Relay encapsulation type
c. The represent the keepalives used to maintain the PVC in an active state
d. They represent the physical address of the router attached to a Frame Relay network

17. Before installing a new, upgraded version of the IOS, what should be checked on the router, and which command should be used to gather this information? (Choose two.)

a. The version of the bootstrap software present on the router
b. The amount of available ROM
c. The amount of available flash and RAM memory
d. show running-config
e. show version
f. show processes

18. A Cisco router is booting and has just completed the POST process. It is now ready to find and load an IOS image. What function does the router perform next?

a. It loads the first image file in flash memory.
b. It attempts to boot from a TFTP server.
c. It checks the configuration register.
d. It inspects the configuration file in NVRAM for boot instructions.

19. The Defense Advanced Research Projects Agency (DAPRA) developed the TCP/IP suite of protocols.

Which layer in that TCP/IP model corresponds to the OSI model’s network layer?

a. Internet
b. Application
c. Transport
d. Network
e. Physical

20. Which two of these statements are true of IPv6 address representation? (Choose two.)

a. A single interface may be assigned multiple IPv6 addresses of any type.
b. Every IPv6 interface contains at least one loopback address.
c. There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.
d. Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.
e. The first 64 bits represent the dynamically created interface ID.

21.

You are the network administrator of the company and receive a call from a user who is unable to reach a server at a remote site. After further review your discover the following information.

local PC 10.0.3.35/24
default gateway 10.0.3.1
remote server 10.0.5.250/24

You then conduct the following tests from the offending local PC.

ping 127.0.0.1 – unsuccessful
ping 10.0.3.35 – unsuccessful
ping 10.0.3.1 – unsuccessful
ping 10.0.5.250 – unsuccessful

Which of the following problems would create the test results listed above?

a. TCP/IP not correctly installed
b. Local physical layer problem
c. Default gateway down
d. Remote physical layer problem












« Last Edit: September 08, 2013, 03:08:26 AM by certforumz »

Offline Abool

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Re: CCENT Questions and Answers - More Questions
« Reply #1 on: March 11, 2015, 11:54:01 PM »
CCENT Final Exam 1 — 50 Question SetQuestion 1:
We want to assign port 3 of our Catalyst 2950 switch to VLAN 3. What command will achieve this?
1. switch(config)#switchport access vlan 3
2. switch#switchport access vlan 3
3. switch(config-if)#switchport vlan 3
4. switch(config-if)#switchport access vlan 3
———————————————
Correct answer(s): 4
Explanation: The switchport access vlan [number] command will configure a switch port to that VLAN. You can also use the switchport access vlan dynamic command to configure the switch port automatically in a certain VLAN depending on the VLAN membership of the incoming packets. For both commands to work properly the switch port needs to be in access mode.
[Implement a small switched network]
——————————————————————————–
Question 2:
Which command will allow only ssh connections to the router?
1. transport input telnet ssh
2. transport input ssh
3. transport ssh
4. transport ssh enable
———————————————
Correct answer(s): 2
Explanation: The transport input ssh line configuration commands allows ssh connections only to the router.
[Implement a small switched network]
——————————————————————————–
Question 3:
Which utility would we use to test all 7 OSI layers?
1. Ping
2. Trace route
3. Telnet
4. Show arp
———————————————
Correct answer(s): 3
Explanation: If we can telnet from one device to the other we have proven that the routing (layer 3) and the physical layer are working properly. Since telnet is an application layer utility it gives us confirmation that all 7 OSI layers are working correctly between the two devices.
[Implement a small switched network]
——————————————————————————–
Question 4:
You are the network administrator and are given the tasks to plan for the future expansion of the network. You decide to subnet the current network of 172.15.0.0. What will be the subnet mask be if every subnet has to allocate 500 hosts.
1. 255.255.0.0
2. 255.0.0.0
3. 255.255.240.0
4. 255.255.254.0
———————————————
Correct answer(s): 4
Explanation: The requirement of having to allocate 500 hosts on each subnet can be achieved by the following: 2^9 = 512. So deducting the broadcast and network address we have 510 possible hosts on each subnet. We used 9 bits to allocate the hosts, this leaves us 7 bits for possible subnets. Those 7 bits in binary is 1111 1110 or 254 in decimal.
[Implement an IP addressing scheme and IP services to meet network requirements for a small branch office]
——————————————————————————–
Question 5:
What address range is commonly used for testing purposes?
1. 10.0.0.0/16
2. Any available IP Address
3. 127.0.0.0/8
4. 240.0.0.0 – 255.255.255.255
———————————————
Correct answer(s): 3
Explanation: The 127.0.0.0/8 address range in the Class A range is a reserved address range and used for testing purposes.
[Implement an IP addressing scheme and IP services to meet network requirements for a small branch office]
——————————————————————————–
Question 6:
If we have multiple IOS versions on our router, how can we view which ones are available?
1. Show version
2. Show memory
3. Show file systems
4. Show flash:
———————————————
Correct answer(s): 4
Explanation: The show flash: command displays the contents of the flash file system.
[Implement a small routed network]
——————————————————————————–
Question 7:
What do you use when you want to display a message to all the terminals connected to a router?
1. banner login
2. banner motd
3. banner exec
4. banner slip-ppp
———————————————
Correct answer(s): 2
Explanation: This MOTD banner is displayed to all terminals connected and is useful for sending messages that affect all users (such as impending system shutdowns). Use the no exec-banner or no motd-banner command to disable the MOTD banner on a line. The no exec-banner command also disables the EXEC banner on the line. When a user connects to the router, the MOTD banner appears before the login prompt. After the user logs in to the router, the EXEC banner or incoming banner will be displayed, depending on the type of connection. For a reverse Telnet login, the incoming banner will be displayed. For all other connections, the router will display the EXEC banner. Connection, Menu, and System Banner Commands
[Implement a small switched network]
——————————————————————————–
Question 8:
Given the following IP Address 172.16.0.0/27 what is the 4th subnet’s network address, host range and broadcast address? The router is running IOS version 12.2.
1. Subnet address 172.16.1.0, host range 172.16.1.1 – 172.16.1.30, broadcast address 172.16.1.31
2. Subnet address 172.16.0.128, host range 172.16.0.129 – 172.16.0.158, broadcast address 172.16.0.159
3. Subnet address 172.16.0.96, host range 172.16.0.97 – 172.16.0.126, broadcast address 172.16.0.127
4. Subnet address 172.16.1.128, host range 172.16.1.129 – 172.16.1.158, broadcast address 172.16.0.159
———————————————
Correct answer(s): 3
Explanation: The default subnet mask for a class B address is /16 so we will have 11 bits for subnets.
12.2 is the IOS mentioned and that has the IP Subnet-Zero command enabled by default.
So the total amount of subnets is 2^11 = 2048 subnets. On each subnet we will have 2^5 – 2 = 30 hosts on each subnet.
Now we will calculate the subnet ranges. The following table is the binary version of the last octet.
subnet bits host bits IP address role
000 00000 172.16.0.0 1st subnet network address
000 00001 172.16.0.1 host # 1
000 00010 172.16.0.2 host # 2
000 11110 172.16.0.30 host # 30
000 11111 172.16.0.31 broadcast address for 1st subnet
001 00000 172.16.0.32 2nd subnet network address
001 00010 172.16.0.34 host # 2 on 2nd subnet
001 11111 172.16.0.63 broadcast address for 2nd subnet
010 00000 172.16.0.64 3rd subnet network address
010 11111 172.16.0.95 broadcast address 3rd subnet
011 00000 172.16.0.96 4th subnet network address
011 11111 172.16.0.127 broadcast address 4th subnet
[Implement an IP addressing scheme and IP services to meet network requirements for a small branch office]
——————————————————————————–
Question 9:
Which of the following symbols indicate that a ping was successful?
1. !
2. .
3. ?
4. U
———————————————
Correct answer(s): 1
Explanation: The following table explains the output generated by ping:
! – reply received
. – timed out
U – unreachable
C – congestion
? – unknown packet type
& packet lifetime exceeded
[Implement a small routed network]
——————————————————————————–
Question 10:
Which layer of the OSI Model does a gateway operate at?
1. Session
2. Application
3. Network
4. Datalink
5. Physical
———————————————
Correct answer(s): 2
Explanation: [Describe the operation of data networks]
——————————————————————————–
Question 11:
What are the 2 sublayers of the Data Link layer of the OSI model?
1. Logical Layer Control
2. Logical Link Control
3. Media Access Control
4. Medium Access Control
———————————————
Correct answer(s): 2 3
Explanation:
Layer Name Protocol/Services Details
7 Application Telnet, FTP, WWW, SMTP Provides and interface by which user applications access the network
6 Presentation ASCIIm, EBCDICm JPG, MIDI Encryption, compression and translation
5 Session RPC, NetBIOS Establishing, maintaining and mananging communication sessions
4 Transport TCP, UDP, SPX Flow and error control but for the end-to-end connection of 2 devices whose logical connection traverses a series of data links
3 Network IP, IPX, ARP, ICMP Routing of data across logical network paths is enabled here and defines packet and addressing format
2 Data Link (Sub-layers are Media Access Control and Logical Link Control) Frame Relay, LAPB, PPP, Ethernet, Token Ring, FDDI Controls how the medium is shared and accessed, how the devices are identified, how data is framed before transmission on the medium
1 Physical Electrical/optical protocols Voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, physical connectors and other similar attributes are defined here
[Describe the operation of data networks]
——————————————————————————–
Question 12:
Which of the following are valid actions of port-security?
1. shutdown
2. restrict
3. protect
4. reset
———————————————
Correct answer(s): 1 2 3
Explanation: The switchport port-security violation interface configuration command has the following options:
Shutdown (the default)
Restrict
Protect
[Implement a small switched network]
——————————————————————————–
Question 13:
Why would a network administrator implement VLANs?
1. Security
2. Higher latency
3. Performance enhancement
4. No more need for routers
5. Broadcast control
———————————————
Correct answer(s): 1 3 5
Explanation: Here are some common reasons that a company might have VLANs:
Security – Separating systems with sensitive data from the rest of the network decreases the chance that someone will gain access to information they are not authorized to see.
Projects/Special applications – Managing a project or working with a specialized application can be simplified by the use of VLAN that brings all of the required nodes together.
Performance/Bandwidth – Careful monitoring of network use allows the network administrator to create VLANs that reduce the number of router hops and increase the apparent bandwidth for network users.
Broadcasts/Traffic flow – Since a principle element of a VLAN is the fact that it does not pass broadcast traffic to nodes that are not part of the VLAN, it automatically reduces broadcasts. Access lists provide the network administrator with a way to control who sees what network traffic. An access list is a table the network administrator creates that lists what addresses have access to that network.
Departments/Specific job types – Companies may want VLANs set up for departments that are heavy network users (such as Multimedia or Engineering) or a VLAN across departments that is dedicated to specific types of employees (such as managers or sales people).
[Implement a small switched network]
——————————————————————————–
Question 14:
Which of the following describe full-duplex Ethernet?
1. it uses point-to-point connections
2. is limited to speeds of 100Mb
3. stations can transmit and receive at the same time
4. it uses point-to-multipoint connections
———————————————
Correct answer(s): 1 3
Explanation: Using full-duplex Ethernet makes it possible for devices to transmit and receive at the same time which results in bandwidth optimization. Point-to-point connections are used between the device and switch. The IEEE802.x committee designed a standard for full duplex that covers 10BaseT, 100BaseX and 1000BaseX.
[Implement a small switched network]
——————————————————————————–
Question 15:
Which of the following would you use if you wanted to transfer data securely across the internet?
1. VPN
2. Leased Line
3. URL Filtering
4. Anti-x
———————————————
Correct answer(s): 1
Explanation: A VPN is used to securely transfer data across insecure media, like the Internet.
[Identify security threats to a network and describe general methods to mitigate those threats]
——————————————————————————–
Question 16:
The address field in a frame-relay header is called?
1. MAC
2. DLCI
3. PVC
4. SVC
———————————————
Correct answer(s): 2
Explanation: The DLCI (Data-Link Connection Identifier) is the address field in a frame-relay header.
[Implement and verify WAN links]
——————————————————————————–
Question 17:
What is the default encapsulation on a Cisco router serial interface?
1. Frame-Relay
2. SDLC
3. PPP
4. HDLC
———————————————
Correct answer(s): 4
Explanation: High-Level Data Link Control. Bit-oriented synchronous data link layer protocol developed by ISO. Derived from SDLC, HDLC specifies a data encapsulation method on synchronous serial links using frame characters and checksums. [Describe the operation of data networks]
——————————————————————————–
Question 18:

What type of cable is shown in the exhibit?
1. AEIA/TIA-232
2. EIA-530
3. X.21
4. V.35
———————————————
Correct answer(s): 4
Explanation: [Implement and verify WAN links]
——————————————————————————–
Question 19:
Which of the following OSI layers is responsible for reliable transmission of data segments?
1. Session
2. Application
3. Transport
4. Data-Link
———————————————
Correct answer(s): 3
Explanation: Layer Name Protocol/Services Details
7 Application Telnet, FTP, WWW, SMTP Provides and interface by which user applications access the network
6 Presentation ASCIIm, EBCDICm JPG, MIDI Encryption, compression and translation
5 Session RPC, NetBIOS Establishing, maintaining and mananging communication sessions
4 Transport TCP, UDP, SPX Flow and error control but for the end-to-end connection of 2 devices whose logical connection traverses a series of data links
3 Network IP, IPX, ARP, ICMP Routing of data across logical network paths is enabled here and defines packet and addressing format
2 Data Link (Sub-layers are Media Access Control and Logical Link Control) Frame Relay, LAPB, PPP, Ethernet, Token Ring, FDDI Controls how the medium is shared and accessed, how the devices are identified, how data is framed before transmission on the medium
1 Physical Electrical/optical protocols Voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, physical connectors and other similar attributes are defined here
[Describe the operation of data networks]
——————————————————————————–
Question 20:
Which of the following protocols operate at Layer 3 of the OSI model? [Select all that apply]
1. IP
2. TCP
3. ICMP
4. UDP
5. ARP
6. SPX
———————————————
Correct answer(s): 1 3 5
Explanation: Layer Name Protocol/Services Details
7 Application Telnet, FTP, WWW, SMTP Provides and interface by which user applications access the network
6 Presentation ASCIIm, EBCDICm JPG, MIDI Encryption, compression and translation
5 Session RPC, NetBIOS Establishing, maintaining and mananging communication sessions
4 Transport TCP, UDP, SPX Flow and error control but for the end-to-end connection of 2 devices whose logical connection traverses a series of data links
3 Network IP, IPX, ARP, ICMP Routing of data across logical network paths is enabled here and defines packet and addressing format
2 Data Link (Sub-layers are Media Access Control and Logical Link Control) Frame Relay, LAPB, PPP, Ethernet, Token Ring, FDDI Controls how the medium is shared and accessed, how the devices are identified, how data is framed before transmission on the medium
1 Physical Electrical/optical protocols Voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, physical connectors and other similar attributes are defined here
[Describe the operation of data networks]
——————————————————————————–
Question 21:
What command will change the hostname of a router?
1. router#host name new name
2. router(config-router)#hostname new name
3. router>host name new name
4. router(config)#hostname new name
———————————————
Correct answer(s): 4
Explanation: To specify or modify the host name for the network server, use the hostname command in global configuration mode.
[Implement a small switched network]
——————————————————————————–
Question 22:
What command do we use to find out how long our router has been online?
1. Show version
2. Show hardware
3. Show uptime
4. Show history
———————————————
Correct answer(s): 1
Explanation: The results of the show version command are shown below:
[Implement a small routed network]
——————————————————————————–
Question 23:
802.11a uses which frequency range?
1. 900 MHz
2. 2.4 GHz
3. 5 GHz
4. 7 GHz
———————————————
Correct answer(s): 3
Explanation: The 5GHz frequency band is used by 802.11a wireless standard.
[Explain and select the appropriate administrative tasks required for a WLAN]
——————————————————————————–
Question 24:
Which of the following protocols are routing protocols? [Select all that apply]
1. BGP
2. FTP
3. OSPF
4. SMTP
5. SNMP
6. RIP
7. NNTP
8. IGRP
———————————————
Correct answer(s): 1 3 6 8
Explanation: Routing protocols are used by intermediate systems to build tables used in determining path selection of routed protocols. Examples of these protocols include Interior Gateway Routing Protocol (IGRP), Enhanced Interior Gateway Routing Protocol (Enhanced IGRP), Open Shortest Path First (OSPF), Exterior Gateway Protocol (EGP), Border Gateway Protocol (BGP), Intermediate System-to-Intermediate System (IS-IS), and Routing Information Protocol (RIP).
[Implement a small routed network]
——————————————————————————–
Question 25:
What is the meaning of amber SYST led on a 2960 switch?
1. This is normal operation
2. There is a bridging loop
3. The switch IOS is loading
4. The switch failed its POST
———————————————
Correct answer(s): 4
Explanation: When the switch failed its POST, Power-On Self Test, the SYST led will turn amber and the IOS did not load.
[Implement a small switched network]
——————————————————————————–
« Last Edit: May 14, 2015, 04:58:42 AM by certforumz »

Offline Abool

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  • Posts: 29
Re: CCENT Questions and Answers
« Reply #2 on: March 11, 2015, 11:56:17 PM »
Question 26:
We want to go back to user EXEC from privileged EXEC. What command do we use to achieve this without exiting the session?
1. Exit
2. Log out
3. Disable
4. Logout
———————————————
Correct answer(s): 3
Explanation: Click here for more information.
[Implement a small switched network]
——————————————————————————–
Question 27:
As a network administrator we want to make it easy to assign IP addresses to hosts. What protocol do we use?
1. DNS
2. DHCP
3. HSRP
4. NTP
———————————————
Correct answer(s): 2
Explanation: DHCP, as described by RFC 1541, or Dynamic Host Configuration Protocol is used for dynamically assigning network addresses and host specific configuration parameters.
[Implement an IP addressing scheme and IP services to meet network requirements for a small branch office]
——————————————————————————–
Question 28:
Which of the following Routing Protocols are considered Interior Protocols?
1. OSPF
2. EGP
3. RIP
4. EIGRP
5. BGP
———————————————
Correct answer(s): 1 3 4
Explanation: Interior protocols are used for routing networks that are under a common network administration. All IP interior gateway protocols must be specified with a list of associated networks before routing activities can begin. A routing process listens to updates from other routers on these networks and broadcasts its own routing information on those same networks. Cisco IOS software supports the following interior routing protocols:
Internet Gateway Routing Protocol (IGRP)
Enhanced Internet Gateway Routing Protocol (Enhanced IGRP)
Open Shortest Path First (OSPF)
Routing Information Protocol (RIP)
Intermediate System-to-Intermediate System (IS-IS)
[Implement a small routed network]
——————————————————————————–
Question 29:
Wireless LANs are defined by which IEEE standard?
1. 802.10
2. 802.5
3. 802.3
4. 802.11
———————————————
Correct answer(s): 4
Explanation: Introduction to Wireless LANs
[Explain and select the appropriate administrative tasks required for a WLAN]
——————————————————————————–
Question 30:
What are some advantages of having a layered OSI Model? [Select all that apply]
1. Changes at one layer do not affect the other layers
2. Networks are harder to design
3. Different vendor’s equipment can easily interoperate
4. Changes at one layer are propagated throughout the other layers
5. Prevents routing loops
———————————————
Correct answer(s): 1 3
Explanation: The main goal of the OSI model is to allow different vendors’ networks to interoperate. Some benefits of the OSI model are:
changes at a certain layer do no affect the other layers.
various types of hardware & software can communicate with each other.
networks are more extensible.
[Describe the operation of data networks]
——————————————————————————–
Question 31:
Given the following network range 192.168.0.0/24. We want minimum 50 hosts on each of the available subnets. What will be the subnet mask?
1. /24
2. /25
3. /26
4. /27
———————————————
Correct answer(s): 3
Explanation: 50 hosts require 6 bits of the last octet giving us 64 -2 = 62 possible hosts this satisfies our requirement and leaves us 2 bits over for the subnets. The default mask is /24 or 255.255.255.0 adding the 2 bits for the subnets it becomes 255.255.255.192 or /26.
[Implement an IP addressing scheme and IP services to meet network requirements for a small branch office]
——————————————————————————–
Question 32:
Which key-sequence would you use to move the cursor to the beginning of the line?
1. CTRL+ P
2. CTRL+ E
3. CTRL + A
4. CTRL + F
———————————————
Correct answer(s): 3
Explanation: Keystrokes Purpose
Press Ctrl-B or press the left arrow key Moves the cursor back one character
Press Ctrl-F or press the right arrow key Moves the cursor forward one character
Press Ctrl-A Moves the cursor to the beginning of the command line
Press Ctrl-E Moves the cursor to the end of the command line
Press Esc B Moves the cursor back one word
Press Esc F Moves the cursor forward one word
Ctrl-P or the up arrow key Recalls commands in the history buffer, beginning with the most recent command. Repeat the key sequence to recall successively older commands
Ctrl-N or the down arrow key Returns to more recent commands in the history buffer after recalling commands with Ctrl-P or the up arrow key. Repeat the key sequence to recall successively more recent commands
[Implement a small switched network]
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Question 33:


You are the administrator of network X. You decided to implement RIP in the following topology (see exhibit). You do not want R3 to receive RIP updates. What configuration changes need to be implemented?
1. Implement a passive-interface on R1
2. Nothing needs to be configured
3. Create a sub-interface on R1
4. Change the routing protocol to OSPF
———————————————
Correct answer(s): 1
Explanation: To block RIP broadcasts on an interface connected to a subnet of a RIP-enabled network add the passive-interface command to the RIP Process.
[Implement a small routed network]
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Question 34:
How do you enable SSH on your switch?
1. switch(config-line)#input ssh
2. switch(config-line)#transport input ssh
3. switch(config-line)#transport ssh
4. SSH is enabled by default
———————————————
Correct answer(s): 3
Explanation: The transport input ssh command will allow SSH sessions to your switch. You also need to create a user and password and generate a public and private key pair.
[Implement a small switched network]
——————————————————————————–
Question 35:
When we have a variation in delay it is called?
1. Loss
2. Latency
3. Delay
4. Jitter
———————————————
Correct answer(s): 4
Explanation: Jitter occurs when there is a variation in the delay.
[Describe the operation of data networks]
——————————————————————————–
Question 36:

After connecting two routers back-to-back we are unable to ping across the serial connection. A closer look reveals that both serial interfaces have the following status:
‘Serial0 is up, line protocol is down’
What needs to be configured on one of the routers to bring the serial interface up? [See the exhibit for network topology]
A) router1(config)# interface serial 0
router1(config-if)#clock rate 64000
B) router1(config)#interface serial 0
router1(config-if)#clockrate 64000
C) router2(config)#interface serial 0
router2(config-if)#clockrate 64000
D) router2(config)#interface serial 0
router2(config-if)#clock rate 64000
1. A
2. B
3. C
4. D
———————————————
Correct answer(s): 4
Explanation: When connecting router back-to-back with a DTE/DCE cross-over cable we need to set the clocking on the DCE side of the connection. The show controllers serial [interface nr] command tells you what side is DTE or DCE.
[Implement and verify WAN links]
——————————————————————————–
Question 37:

We try to look at the log on the router but we get the following [see exhibit]. What do we need to do in order to view the log?


1. Reboot the router
2. Use the logging buffered global configuration command
3. Use the enable log all global configuration command
4. We can not do anything since there is no such thing as a log
———————————————
Correct answer(s): 2
Explanation: To enable system messages to a local buffer use the logging buffered [size] command in global configuration mode. The default size is 4096k and once this is full older messages will be overwritten with newer ones.
[Implement a small routed network]
——————————————————————————–
Question 38:
HTTP and FTP are found at which OSI layer?
1. Network layer
2. Transport layer
3. Application layer
4. Presentation layer
———————————————
Correct answer(s): 3
Explanation:
Layer Name Protocol/Services Details
7 Application Telnet, FTP, WWW, SMTP Provides and interface by which user applications access the network
6 Presentation ASCIIm, EBCDICm JPG, MIDI Encryption, compression and translation
5 Session RPC, NetBIOS Establishing, maintaining and mananging communication sessions
4 Transport TCP, UDP, SPX Flow and error control but for the end-to-end connection of 2 devices whose logical connection traverses a series of data links
3 Network IP, IPX, ARP, ICMP Routing of data across logical network paths is enabled here and defines packet and addressing format
2 Data Link (Sub-layers are Media Access Control and Logical Link Control) Frame Relay, LAPB, PPP, Ethernet, Token Ring, FDDI Controls how the medium is shared and accessed, how the devices are identified, how data is framed before transmission on the medium
1 Physical Electrical/optical protocols Voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, physical connectors and other similar attributes are defined here
[Describe the operation of data networks]
——————————————————————————–
Question 39:
For the network 192.168.1.0/27, what is the 5th subnet’s network address, broadcast address and host range? IP Subnet-zero is configured.
1. Subnet 192.168.1.0, Broadcast 192.168.1.31, hosts 192.1683.1.1 – 192.168.1.30
2. Subnet 192.168.1.160, Broadcast 192.168.1.191, hosts 192.168.1.161 – 192.168.1.190
3. Subnet 192.168.1.96, Broadcast 192.168.1.127, hosts 192.168.1.97 – 192.168.1.126
4. Subnet 192.168.1.128, Broadcast 192.168.1.159, hosts 192.168.1.129 – 192.168.1.158
———————————————
Correct answer(s): 4
Explanation: The default subnet mask for a class C address is /24 so we will have 3 bits for subnets.
So the total amount of subnets is 2^3 = 8 subnets
On each subnet we will have 2^5 – 2 = 30 hosts on each subnet
Now we will calculate the subnet ranges:
The following table is the binary version of the last octet.
Subnet bits Host Bits IP Address Role
000 00000 192.168.1.0 1st subnet network address
000 00001 192.168.1.1 host nr 1
000 00010 192.168.1.2 host nr 2
000 11110 192.168.1.30 host nr 30
000 11111 192.168.1.31 broadcast address for 1st subnet
001 00000 192.168.1.32 2nd subnet network address
001 00010 192.168.1.34 host nr 2 on 2nd subnet
001 11111 192.168.1.63 broadcast address for 2nd subnet
011 00000 192.168.1.96 4th subnet network address
011 11111 192.168.1.127 broadcast address 4th subnet
100 00000 192.168.1.128 5th subnet network address
100 11111 192.168.1.159 broadcast address 5th subnet
[Implement an IP addressing scheme and IP services to meet network requirements for a small branch office]
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Question 40:
What kind of attack is designed to gather information?
1. DoS attack
2. DDoS attack
3. Reconnaissance attack
4. Access attack
———————————————
Correct answer(s): 3
Explanation: A reconnaissance attack is an attack aimed at gathering information as preparation for further attacks.
[Identify security threats to a network and describe general methods to mitigate those threats]
——————————————————————————–
Question 41:
Which of the following are considered CPE?
1. CSU/DSU
2. Telco switch
3. Router
4. Demarcation point
———————————————
Correct answer(s): 1 3
Explanation: The CSU/DSU and router are considered CPE, Customer Premises Equipment.
[Implement and verify WAN links]
——————————————————————————–
Question 42:
What command do we use to determine if a Serial interface on a Cisco router is either DTE or DCE?
1. Show interface serialx
2. Show ip interface serialx
3. Show controllers serial x
4. Show role serial x
———————————————
Correct answer(s): 3
Explanation: Click here for sample output of this command.
[Implement and verify WAN links]
——————————————————————————–
Question 43:
Which of the following protocols can you find at the Transport layer of TCP/IP model? [Select all that apply]
1. ICMP
2. TCP
3. IP
4. FTP
5. ARP
6. UDP
———————————————
Correct answer(s): 2 6
Explanation: The Transport layer of the TCP/IP model corresponds with the Transport layer of the OSI model. TCP and UDP is found at these layers of the TCP/IP or OSI model.
[Describe the operation of data networks]
——————————————————————————–
Question 44:
Our router has restarted and we want to know what caused this. Which command can we use to find out?
1. Show history
2. Show version
3. Show startup-config
4. Show ip protocols
———————————————
Correct answer(s): 2
Explanation: When issuing the show version command we the output displays a line ‘System restarted by’ followed by a reason. This line will give a good indication what the reason was why the router restarted.
[Implement a small routed network]
——————————————————————————–
Question 45:
Which of the following statements are true? [Select all that apply]
1. Switches control broadcast domains
2. Hubs control collision domains
3. Routers control broadcast domains
4. Hubs control broadcast domains
5. Switches control collision domains
———————————————
Correct answer(s): 3 5

Explanation: Routers are the border of a broadcast domain because they don’t forward broadcasts by default. A switch can control a broadcast domain if VLANs are configured on the switch otherwise they divided the network in separate collision domains.

[Implement a small switched network]
——————————————————————————–
Question 46:
What is described by a self-propagating piece of software that replicates itself on the network and usually used in DoS attacks?
1. Virus
2. Trojan
3. Spyware
4. Worm
———————————————
Correct answer(s): 4
Explanation: A worm is a program that self-propagates on the network without user intervention and is commonly used in DoS attacks.
[Identify security threats to a network and describe general methods to mitigate those threats]
——————————————————————————–
Question 47:
Which of the following terms describes an IP address that represents a host on an enterprise network?
1. Inside global
2. Inside local
3. Outside global
4. Outside local
———————————————
Correct answer(s): 2
Explanation: The inside local address is the IP Address of a host that is local to the enterprise network.
[Implement and verify WAN links]
——————————————————————————–
Question 48:
How many bytes make up the network portion of a class C address?
1. 1
2. 2
3. 3
4. 4
5. 6
6. 8
———————————————
Correct answer(s): 3
Explanation: The first 3 octets of a class C address represents the network part, an octet is 1 byte long.
[Implement an IP addressing scheme and IP services to meet network requirements for a small branch office]
——————————————————————————–
Question 49:
We want to create an additional VLAN on our Catalyst 2950 switch. Which command do we use?
A) Switch1(config)#vlan 45
Switch1(config-vlan)#end
B) Switch1(config-vlan)#vlan 45
Switch1(config-vlan)#end
C) Switch1(enable)#vlan 45
D) Switch1(config-vlan)#vlan 45
Switch1(config-vlan-database)#end
1. A
2. B
3. C
4. D
———————————————
Correct answer(s): 1
Explanation: We create a new VLAN in global configuration mode. After creating the VLAN with the vlan VLAN_ID command we exit the VLAN database by using the end command to update this database.
[Implement a small switched network]
——————————————————————————–
Question 50:
Which of the following is a mechanism used by TCP/IP to protect buffer space and routing devices?
1. Flow control using windowing
2. Connection establishment and termination
3. Error recovery
4. Multiplexing using ports
———————————————
Correct answer(s): 1
Explanation: Flow control using windowing is a mechanism used by TCP/IP to protect buffer space and routing devices in the transport layer of the OSI model.
[Describe the operation of data networks]

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