Author Topic: CCNA Questions - VLANs  (Read 5441 times)


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CCNA Questions - VLANs
« on: June 26, 2010, 02:18:30 AM »
            VLANs and VTP

Q1: Which of the following is not a valid VTP mode?

                A. Server
                B. Client
                C. Transparent
                D. Hybrid

Ans: D

VTP, short for VLAN Trunking Protocol, is a Layer 2 messaging protocol. It is used to carry VLAN configuration information between VLANs.  VTP ensures that all switches in the VTP domain are aware of all VLANs.  VTP operates in one of three modes:

1. Server mode
2. Client mode
3. Transparent mode

VTP Servers can create, modify, or delete VLANs and other configuration parameters for the specified VTP domain.

A switch configured as VTP client can't create, change, or delete VLANs for the specified VTP domain.

A VTP transparent mode is used when a switch is not required to participate in VTP, but only pass the information to other switches. Transparent switches don't work either as Server or clients.

Configurations made to a single switch, called VTP server, are propagated across the switch fabric under a single domain control. Other switches, configured as VTP clients, learn the configuration information from the server. It is important to know that, Cisco switches such as Catalyst 1900,  acting as VTP servers save the VLAN configuration information in their Non volatile memory (NVRAM), whereas client keep the information only in running configuration.

Q2: Which of the following are valid VLAN Trunk Protocols over Fast Ethernet? [Select 2].

            A. Inter-Switch Link
            B. 802.10
            C. LANE
            D. 802.1Q

Ans: A, D

Explanation: Inter-Switch Link and 802.1Q are two VLAN Trunking Protocols used with Fast Ethernet, that Cisco supports. LANE is associated with ATM and 802.10 is associated with FDDI. Also, it is important to note that ISL, 802.1Q, and 802.10 use Frame Tagging to identify the VLANs.

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« Last Edit: September 02, 2011, 03:03:17 PM by certforumz »

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CCNA Questions - VLANs Access and Trunk Links/Interfaces
« Reply #1 on: July 27, 2011, 11:10:25 PM »
What is a trunk link?

   1. A link that is only part of one VLAN and is referred to as the native VLAN of the port
   2. A link that can carry multiple VLANs
   3. A switch port connected to the Internet
   4. Data and voice capability on the same interface

Answer :B

VLAN Links - Interfaces

VLANs have two types of interfaces, or links. These links allow us to connect multiple switches together or just simple network devices e.g PC, that will access the VLAN network. Depending on their configuration, they are called Access Links, or Trunk Links.

Access Links

Access Links are the most common type of links on any VLAN switch. All the host computers connect to the switch's Access Links in order to gain access to the local network. You are able to plug a computer into them and access your network.

It is important to note that any device connected to an Access Link (port) is totally unaware of the VLAN assigned to the port. The device simply assumes it is part of a single broadcast domain, just as it happens with any normal switch. During data transfers, any VLAN information or data from other VLANs is removed so the recipient has no information about them.

Trunk Links:

A Trunk Link, or 'Trunk' is a port configured to carry packets for one or more VLAN. These type of ports are usually found in connections between switches or between a switch and a router. These links require the ability to carry packets from multiple VLANs because VLANs span over multiple switches.

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« Last Edit: September 02, 2011, 03:06:41 PM by certforumz »