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There are a lot of commands with Cisco Router and Switch IOS, whereas If I talk about the survival command list top 10 at associate level, these are the top 10 ccna survival commands which each network administrator must know.

No. 1: HELP ?

That is the actual help on a specific mode. The question Mark shows the list of all available commands on that specific mode. 

There are a lot of options and human error can never be ignore, So being human if we forget what we have to apply ? Always help me and show me the list of available commands quickly. I spend a lot of time using this just to remember the other commands too. Always my best buddy during configuration. 

If you provide a few letters that can also show the rest of options, the match the letter as provided by you

Router(config)#b?

banner bba-group boot

No. 2: show running-config

This is the command which shows you where you are in router configuration, what is running, what is inside memory, the status.

The configuration of switch, router firewall. Whatever we configure that resident inside RAM (Show-Running) until and unless we apply the write command or copy command to save the data to another destination.

Router#show running-config

Building configuration…

No 3: Copy Command / Write

To save the data from RAM(Random Access Memory) to NVRAM(Non Volatile Random Access Memory)

When we configure, setting resident in RAM and save to be available in the next reload that should be in NVRAM, so we must apply the copy command to startup. Whereas we can also save the setting to any other like USB , tftp server. There is a difference between copy and write, write only saves the current terminal whereas the copy command saves all settings from RAM to mention destination.

No. 4: Show version Command

Memory, interfaces, ios version and software release. Excellent command to check the machine level to be used for specific purposes like K9 support etc.

No 5: Show interface Command

The exact situation and setting on a specific interface MTU, BW and Delay Line protocol status. Full duplex, ARP, ARPA , Input output , traffic collision , CRC, Frame etc

All kinds of information this command shows and best of best to check or troubleshoot purposes.

No 6: Show ip interface

This is the command with

All above variation and very best to briefly check the status of all your interface in a single page.

No 7: No and No Shutdown

There are a lot of commands we apply for the setting and might be later feel there is no need to remove all these commands mostly we can use the

no command

That will be removed from the router configuration.

Whereas the No Shutdown, administratively up the physical interface, we can check that by using the show ip interface command.

No 8: show ip route

The best and perfect command to check the routing table. The best command is to first also show the explanation of this result. The network administrator can verify the routes added in the routing table.

As the routing table gets the entry from the directly attached interface, manually added routes or the dynamically configured routing protocols like RIP, OSPF, EIGRP, IS-IS , BGP. The best part is to troubleshoot the missing routes or routing matters.

No 9: Configure Terminal Command

The command is actually the gateway for the rest of IOS commands. By using this command we can go to further configurations like Routing protocol, VLAN , DHCP, Access List, Enable password, Enable Secret, SSH Configuration, Interface Configuration, PPP/ HDLC etc.

THis command leads toward the global configuration mode also.

No. 10: Debug Command

Actually the debug command is used to identify the errors and after that to remove them. This feature is available in all language IDE for the support to developer and network administrator in GUI or CLI.

We have the option of debugging with further options after that. Check in below.