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Router Commands Overview

Router Commands are the on board functions of the router to give specific commands. There are large numbers of fundamental and professional commands and remembering all of them is an uphill task. However, frequently used commands can be remembered easily. Below is a guide which will give you the most frequently used commands but before that are the keyboard shortcuts which will assist you in using router:-
SHIFT + CTRL + 6 = Break
CTRL + P =     Previously used command is displayed
CTRL + N=     Next Command is displayed
There are different codes used which are organized according to their functions and usage in different categories. The important commands are appended below:-
1.         User Mode Command
            a.         Enable
            b.         Disconnect
            c.         Ping
2.         Privilege Mode Command:       
            a.         Configure Terminal
            b.         Clear arp-cache
            c.         Debug ip packet
            d.         Disconnect
            e.         Show interfaces loopback 0
            f.          Copy running-config startup-config
            g.         erase startup-config
            h.         how interfaces ethernet 0
            i.          Show interfaces serial 0
3.         Global Configuration Mode Commands
            a.         Access list (permit | Deny)
            b.         access-list {permit | deny}
c.         access-list {permit | deny}
d.         access-list {permit | deny}
e.         access-list {permit | deny}
f.          ip default-gateway
g.         interface fastethernet
h.         dialer-list protocol ip permit
i.          enable password
4.         Interface Sub- Configuration Mode Commands:
            a.         Dialer-Group
            b.         Description
            c.         Compress stac in
            d.         Clock rate
            e.         CDP enable
            f.          Bandwith
5.         Line Sub Configuration Mode Command:
            a.         Password
            b.         Logging synchronous
            c.         Exec-timeout (seconds)
6.         Sub interface Sun-Configuration Mode Commands:
            a.         IP Address
            b.         Frame-relay map broadcast ietf
            c.         Frame-relay map broadcast
            d.         Frame-relay map
            e.         Frame-relay interface DLCI
7.         IP Routing Protocol Sub Configuration Mode Commands:
            a.         Network.        
            To get the desired results, it is very important to use these commands accurately and these guidelines will assist you in getting those desired results.
            Routing Information Protocol (RIP) is a protocol used in a network for selection of routes of different packets. It is an open standard dynamic routing protocol which cannot be related to a specific vendor. The latest version of RIP is RIP v2 with advanced features like it supports VLSM (variable length subnet masking) and also transmit routing updates with subnet mask information.
To enable passwords, configure hostname, then configure console from the global configuration mode.
To prevent the router from interrupting the command you are typing use the second command. If you are interrupted with a logging message while you are in the middle of typing a command, it can be very disturbing as we want the router to display a message but not in the middle of entering a data. To prevent it, the command is logging synchronous and it is done as:-
            a.         R1 (config) #line console0
            b.         R1 (config – line) # exec – timeout 0 0
            c.         R1 (config – line) # logging synchronous

These commands will not be seen in the exams but once configured, one wonders how he did it without them. These tips will give you a precise way of getting configured your router at initial level easily.