Commands

Modules: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | All |

Module 3: Troubleshooting at the Physical Layer

3.1.5

Noncritical characteristics - console messages

> Router#show interface
> Router(config-if)#no keepalive

3.3.1

End-system commands - common commands

> ping {host | ip-address}
> arp -a
> netstat -r
> netstat -n

3.3.2

End-system commands - Windows only

> ipconfig /all (Windows NT/2000/XP)
> tracert [destination]
> winipcfg (Windows 9x)

3.3.3

End-system commands - UNIX/Mac OS

> ifconfig -a
> traceroute

3.3.4

Common Cisco IOS commands

> Router#clear counters
> Router#debug {option}
> Router#diag [slot]
> Router#ping {host | ip-address}
> Router#traceroute {host | ip-address}
> Router#undebug all

3.3.5

Cisco IOS show commands

> Router#show arp
> Router#show buffers
> Router#show cdp neighbors
> Router#show context
> Router#show controllers
> Router#show diag [slot]
> Router#show diagbus [slot]
> Router#show environment
> Router#show interface
> Router#show ip interface [brief]
> Router#show logging
> Router#show mac-address table {module/port}
> Router#show memory
> Router#show module
> Router#show port {module/port}
> Router#show port status
> Router#show processes cpu
> Router#show processes memory
> Router#show running-config
> Router#show stacks
> Router#show tech-support
> Router#show version

3.4.2

Cabling faults - CAT5

> ipconfig /all (Windows NT/2000/XP)
> ifconfig -a (UNIX/Mac OS)

3.5.5

Interface configuration

> Switch#no switchport

3.6.2

ARP Command

> Router#arp -s ip-address mac address
> Router#arp -d ip address

3.6.3

Solving common problems - Windows, UNIX/Mac OS end-system commands

> For Windows 2000 and XP:
> ipconfig
> ipconfig /release
> ipconfig /renew

> For UNIX and Mac OS:
> ifconfig -a

3.6.4

Solving common problems - Cisco IOS commands

> Router#clock rate {value}
> Router#configure terminal
> Router#copy running-config starting-config
> Router#disable
> Router>enable
> Router(config-if)#encapsulation {options}
> Router(config)#exit
> Router(config)#interface {type} {slot/number}
> Router(cnofig-if)#no shutdown
> Router(cnofig-if)#shutdown

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