CCNA Certification/Appendix B - Cisco Router Commands and their Usages
Acknowledgements — Introduction — The OSI Model — Application Layer — Transport Layer — Network Layer — Addressing — Routing Protocols — Data Link Layer — Switching — Physical Layer — Router Operation — Advanced Addressing Topics — Advanced Routing Topics — Advanced Switching Topics — Security — WAN — Configuration — Conclusion — References — About the Exam — Cisco Router Commands — Quick Reference Sheet
Cisco Router Commands and their UsagesEdit
User Mode CommandsEdit
These commands can only be entered from user mode.
|SHOW||show ?||This is used to view the available commands set to this layer, use this to learn and navigate the Router/Switch.|
|OSPF||show ip ospf nei||This is used from the basic user prompt to view neighbor details for WAN connection. To view details, use the "det" after the original command. This is a very helpful trouble shooting command for user level access.|
Privileged Mode CommandsEdit
These commands can only be entered from privileged mode. To enter privileged mode, use the enable command.
|enable||enable||Switches to privileged mode. If the enable password has been set, you will be prompted to enter it.|
|disable||disable||changes to user mode|
|configure terminal||conf[igure] t[erminal]||switches to config mode, this will allow you to make critical changes to the Router/Switch|
|terminal editing||terminal editing||enabled special unix-style editing commands|
|show||show ?||This is used to help the enabled user see the available commands on that specific layer. You may use this on each layer and after any command to help view the next part of syntax.|
|show||sh?||This will show options of what is available to you that has "sho" for the beginning of a command, in this case it will have "show" as it's only option. Try using other letters or beginnings to see more variety such as: "s?" or "a?" These will give you a larger list.|
|cdp||show cdp nei det||this will show all used connections to your ports and whom they are connected to. This is very helpful when drawing out a system diagram.|
These commands can only be entered from config mode. To enter config mode, use the "conf t" command.
|Enable||enable secret Justin||This will set a Password to get to enable mode so others cannot make changes with out proper access. In this case we are making the password Justin (case sensitive).|
|config-register||config-register 0xnnnn||This command modifies the boot settings on the router.
Example settings are:
|hostname||hostname NAME||changes the router name to NAME|
|router rip||router rip||enables the RIP routing protocol and switches to router configuration mode|
|int||int s0||Switches to interface configuration mode (s0 stands for Serial 0 but interfaces naming may vary). It is possible to use other interfaces such as Consoles (local), vty 0 ? (telnet), and much more.. You may also create passwords within those layers for more security using the "password" command at that interfaces layer.|
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