Passing The Cisco Ccna Exam An Illustrated Guide To Router Modes

Passing The Cisco Ccna Exam An Illustrated Guide To Router Modes



Passing The Cisco CCNA Exam: An Illustrated Guide To Router Modes
When you're getting started on your CCNA studies, learning the different router modes is​ key to​ passing your Intro and ICND exams .​
But keeping those modes straight can be very difficult .​
(At least it​ was for me!) Let's take a​ look at​ the various router modes you'll need to​ know about to​ pass your CCNA, and use IOS Help to​ illustrate the different uses of​ each mode.
The first mode you'll see on a​ router (if the person before you logged off as​ they should have) is​ user exec mode .​
This is​ also the default mode a​ user is​ placed into when using Telnet to​ connect to​ a​ router .​
The prompt will look like this:
R1>
You can't write or​ add to​ a​ configuration in​ this mode, but you can run quite a​ few show commands .​
This is​ a​ good mode to​ have users in​ who need to​ see the configuration, but shouldn't be allowed to​ change it.
To get to​ the next level, type enable at​ the user exec prompt:
R1>enable
R1#
Notice that the prompt changed .​
This mode has two names, the official one being privileged exec mode .​
It's more commonly referred to​ as​ enable mode, since enable is​ what you type to​ get into this mode.
This mode gives you more options for show and other commands, but you still can't configure anything .​
To configure global commands, use configure terminal, or​ conf t, to​ enter global configuration mode.
R1#conf t
Enter configuration commands, one per line .​
End with CNTL/Z.
R1(config)#
The prompt has changed again, and now global configuration commands such as​ hostname and no ip domain-lookup can be entered.
From here, you've got a​ lot of​ options, but we'll look at​ three you need to​ know for your CCNA exams .​
To apply configuration commands to​ an​ interface, enter interface configuration mode, as​ shown here:
R1(config)#interface serial0
R1(config-if)#
You must be in​ global config mode to​ get into interface config mode you cannot go from enable mode straight to​ interface configuration mode.
R1#interface serial0
^
% Invalid input detected at​ '^' marker.
Interface configuration mode allows you to​ apply an​ IP address to​ the interface, as​ well as​ many other commands related to​ frame relay, ISDN, and dynamic routing protocols.
For the CCNA, you need to​ know about two other configuration modes .​
To configure console commands (such as​ password protection), enter line configuration mode as​ shown here:
R1#conf t
Enter configuration commands, one per line .​
End with CNTL/Z.
R1(config)#line console 0
R1(config-line)#password cisco
R1(config-line)#login
The prompt (config-line) indicates that you're in​ line configuration mode .​
Your console line is​ not the only line you'll be configuring for the CCNA, though your vty lines are used for incoming telnet connections and must be configured in​ a​ similar fashion.
R1#conf t
Enter configuration commands, one per line .​
End with CNTL/Z.
R1(config)#line console 0
R1(config-line)#password cisco
R1(config-line)#login
R1(config-line)#line vty 0 4
R1(config-line)#password cisco
R1(config-line)#login
Notice that you do not have to​ exit one interface mode to​ go to​ another one .​
Let's say that you've configured your vty lines and now want to​ put an​ IP address on your Ethernet interface .​
You don't have to​ go out with ctrl-z and then start again you can go straight to​ interface config mode from line config mode .​
Just make sure you see the prompt change!
R1(config-line)#line vty 0 4
R1(config-line)#password cisco
R1(config-line)#login
R1(config-line)#interface ethernet0
R1(config-if)#ip address 15.1.1.1 255.255.255.0
When you're preparing for CCNA exam success, there's a​ lot to​ absorb .​
Just take it​ one piece at​ a​ time, get some hands-on experience to​ go with your theory, and before you know it​ you're moving around in​ the different Cisco router configuration modes without giving it​ a​ second thought .​
Keep studying and your CCNA exam success is​ assured!




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