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clear arp-cache ” Clears the router's ARP cache.
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show ip int brief ” A summary of the IP status and configuration of the IP interfaces.
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show ip interface ” Displays a complete set of information on all the IP interfaces, including the configuration, status of each interface, and detected errors.
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ping ” Uses ICMP to test connectivity of a remote interface.
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The trace command output characters :
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msec ” The round trip time in milliseconds .
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* ” A timed out request.
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? ” An Unknown packet type.
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Q ” A source quench.
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P ” The protocol is unreachable.
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N ” The network is not reachable .
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U ” The port is not reachable.
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H ” A designated host is not reachable.
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no ip domain lookup ” Allows you to use only a host table on the router for DNS.
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show hosts ” Displays the host names table.
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show ip access-list ” Displays the access lists configured on installed IOS software.
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show ip route ” Displays information from the routers IP route table.
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ip helper-address ” Converts broadcast messages for specific protocols into directed broadcast or Unicast messages.
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show controllers ” Output shows the current state of the physical interface including errors and collisions.
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ip name -server ” This command followed by the IP address or addresses of DNS servers sets the DNS servers used by the Cisco IOS.