CDP protocol: Cisco Discovery Protocol
Show CDP
Show CPD Neighbors: see which Cisco devices are connected to the current device
CDP timer: Modify send interval time
CDP Holdtime: Modify retention time
CDP advertise-2: Modify version number
Debug CDP Packets
Show CDP traffic: View statistics about CDP packages
Show CDP interface: View Port CDP information
Show CDP entry: View details for all neighbors
CDP run: Global Open All Interface CDP protocol
No CDP run: Global disable CDP Protocol
CDP enable: Interface mode enables CDP protocol
No CDP enable: Interface mode disable CDP protocol
Ctrl+shift+6 simultaneously release press x: Telnet multiple devices simultaneously
Show Sessions: Check Telnet connection
Show Users: Check telnet user
IP host R1 192.168.1.10: Setting up the host table
No IP host R1: delete a host name
No IP domain-lookup: Disable DNS domain name resolution
Ping
Trace: As with Ping, the route can be displayed