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What is CCNA?

CCNA is a well-known entry-level certification exam offered by Cisco. CCNA is a certification that certifies you of having knowledge regarding establishing, maintaining and troubleshooting any network which consists of ROUTERS, SWITCHES, NETWORK PRINTERS, SERVERS, FIREWALLS, etc.

The process to Get CCNA Certificate

To achieve CCNA either you can directly pass the CCNA routing and switching exam or to go with two certifications like CCENT (ICND1) and ICND2. If you have zero knowledge of CCNA it is recommended to take two certifications to achieve CCNA. Registration for the exam can be done directly at Cisco or with the help of a Cisco Learning Partner. Cisco learning partners are known for their unmatched quality training and providing quality learning resources along with certified instructors.
Register for the exam at VUE (www.vue.com/cisco)

Benefits of CCNA Certification

1.   For sure you are going to increase the knowledge and broaden your understanding of this concept on how it works.
2.   The chance of getting promoted is easy with a good hike.
3.   CCNA Certification helps in stable employment in the reputed IT firms
4.   Even if you are from a non-technical background you can become a CCNA certified by clearing the examination.
5.   The certification keeps you active in all the latest trends and technology.
6.   CCNA certification will lead to many other certifications like CCNA security, CCNA wireless, and many other professional certifications

Good Resources to Prepare CCNA

1.   Cisco CCNA Practice test from simulationexams.com and certexams.com
2.   CCNA cram notes from examguides.com
3.   CCNA practice labs from certexams.com
4.   CCNA Android and CCNA 200–125 iOS mobile practice apps
5.   YouTube videos from professor messer
6.   official cert guide of CCNA

Disclaimer: Simulationexams.com and certexam.com is neither associated nor affiliated with Cisco® or any other company. CCNA™, CCNP™, CCENT™, CCDA™ are trademarks of Cisco® and duly acknowledged

[edit system]
user@switch# authentication-order [ tacacplus password ];

[edit]
user@host# show system authentication-order
authentication-order [password, tacplus];

shared secret: testing123

set system tacplus-server address 172.16.98.24
set system tacplus-server 172.16.98.24 secret Testing123
set system tacplus-server 172.16.98.24 source-address 10.0.0.1

[edit]
user@host# show system tacplus-server
tacplus-server 172.16.98.24 {
secret Tacacssecret1;
source-address 10.0.0.1;
}

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/user-access-tacacs-authentication.html#id-example-configuring-a-tacacs-server-for-system-authentication

Authentication order using tacacs+ password (local):
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/junos-os-authentication-order.html#id-junos-os-authentication-order-for-radius-tacacs-and-password-authentication

The steps include the following:
1. Configuring authentication on TACACS+ server (say, Ubuntu Linux OS)
2. Configuring authorization on TACACS+ server
3. Configuring accounting on TACACS+ server

Next,
1. Configuring TACACS+ on Juniper devices for authentication, authorization, and accounting.

Check out these resources (Found it a bit hard to get relevant resources for TACACS+ config for Juniper):
a) Configuring authentication order on Juniper devices:
[edit system]
authentication-order tacplus password ;
    Try configured TACACS+ authentication servers.
    If TACACS+ server is available and authentication is accepted, grant access.
    If TACACS+ servers fail to respond or return a reject response,  try password authentication, because it is explicitly configured in the authentication order.

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/junos-os-authentication-order.html#id-junos-os-authentication-order-for-radius-tacacs-and-password-authentication

To edit config file:

admin@ubuntu:~$ vi /etc/tacacs+/tac_plus.conf

Using config file, define all required attributes, including the following:
key=testing123 ;change as required. The same needs to be configured on each juniper device for aaa.

Create user accounts and groups. It is easy to administer if you create groups.
user = NetworkEngineer1 {
        member = Network_Engineers
}
user = Admin1 {
        member = Admins
}
user = Monitor1 {
        member = Managers
}

login = file /etc/passwd
enable = file /etc/passwd

group =  Admins {
        default service = permit
        login = file /etc/passwd
        enable = file /etc/passwd
}

group = Network_Engineers {
        default service = deny
        login = file /etc/passwd
        enable = file /etc/passwd
        service = exec {
        priv-lvl = 2
        }
        cmd = enable {
                permit .*
        }
        cmd = show {
                permit .*
        }
        cmd = do {
                permit .*
        }
        cmd = exit {
                permit .*
        }
        cmd = configure {
                permit terminal
        }
        cmd = interface {
                permit .*
        }
        cmd = shutdown {
                permit .*
        }
        cmd = no {
                permit shutdown
        }
        cmd = speed {
                permit .*
        }
        cmd = duplex {
                permit .*
        }
        cmd = write {
                permit memory
        }
        cmd = copy {
                permit running-config
        }
}

group = Managers {
        default service = deny
        login = file /etc/passwd
        enable = file /etc/passwd
        service = exec {
        priv-lvl = 2
        }
        cmd = enable {
                permit .*
        }
        cmd = show {
                permit .*
        }
        cmd = exit {
                permit .*
        }
}

Creating a test user account and the group might be a good idea, so you can test things out that have been added to this configuration. This particular test user will only have a cleartext password.

user = test {
        member = Test_Group
}
group = Test_Group {
        default service = deny
        service = exec {
        priv-lvl = 2
        login = password1
        enable = password1
}

admin@ubuntu:~$ sudo /etc/init.d/tacacs_plus restart
password for admin:
 * Restarting TACACS+ authentication daemon tacacs+                      [ OK ]
admin@ubuntu:~$

User Accounts

It is now time to create the user account under Linux.

admin@ubuntu:~$ sudo adduser test
Adding user `test' ...
Adding new group `test' (1001) ...
Adding new user `test' (1001) with group `test' ...
The home directory `/home/test' already exists.  Not copying from `/etc/skel'.
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
Changing the user information for test
Enter the new value, or press ENTER for the default
   Full Name []:
   Room Number []:
   Work Phone []:
   Home Phone []:
   Other []:
Is the information correct? [Y/n] y

To remove a user:
admin@ubuntu:~$ sudo deluser test
 password for admin: Removing user `test' ... Warning: group `test' has no more members. Done.

https://networkjutsu.com/tacacs-ubuntu/

Note: You can use a different password file for tacacs. You need not have the user registered using Add User in Linux. If you want tacacs+ not to use Linux users, use different password file and call it in .conf.

Check this out for boot rom upgrade (boot image)
https://www.cisco.com/c/en/us/support/docs/routers/1600-series-routers/6301-rommon-boot-image.html