IT-CMDS technician tool
Cisco Network Tools
Subnetting, wildcard masks, VLAN planning and Cisco command references.
Cisco utilities
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Wildcard mask
Use CIDR calculator page for wildcard masks.
Example /24 wildcard: 0.0.0.255
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VLAN planning
Document VLAN IDs, names, subnets and gateways.
VLAN 10 Users
VLAN 20 Voice
VLAN 30 Servers
VLAN 99 Management
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Useful commands
Common show commands.
show run
show ip int brief
show vlan brief
show mac address-table
show cdp neighbors
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Common ports
Network troubleshooting ports.
22 SSH
23 Telnet
80 HTTP
443 HTTPS
161 SNMP