Module 8.1 15 minIntermediate
The 50-command cheat sheet
Every core CLI command you should be able to type from memory, organized by mode.
Course plan — preview
Every core CLI command you should be able to type from memory, organized by mode.
enable ! drop into privileged mode
configure terminal ! enter global config
ping <ip> ! L3 reachability
traceroute <ip> ! per-hop path
show version ! OS version, uptime
show ip interface brief ! IP/up state per interface
show ip route ! routing table
show ip protocols ! dynamic protocols summary
show running-config ! current running config
show startup-config ! NVRAM saved config
show vlan brief ! VLAN/port mapping (switch)
show mac address-table ! learned MACs (switch)
show interfaces status ! link/speed/vlan per port (switch)
show interfaces trunk ! trunk negotiation/state
show ip ospf neighbor ! OSPF adjacencies
show cdp neighbors ! proprietary neighbour discovery
show ip dhcp binding ! handed-out leases
copy running-config startup-config ! save
write memory ! shorter alias
clear arp ! flush ARP cache
clear mac address-table dynamichostname <name>
ip route <net> <mask> <next-hop>
ip route 0.0.0.0 0.0.0.0 <next-hop> ! default
ip default-gateway <ip> ! L2 switch / endpoint
vlan <id> / name <text>
spanning-tree mode rapid-pvst
spanning-tree portfast default
ip dhcp pool <name>
ip dhcp excluded-address <start> <end>
router ospf <pid>
network <ip> <wildcard> area <id>
ip access-list extended <name>
crypto key generate rsa modulus 2048
ip ssh version 2
username <u> privilege 15 secret <pw>
banner motd # ...message... #
enable secret <pw>
line console 0 / line vty 0 4
service password-encryption
no ip domain-lookup1 more section in this chapter, plus a 1-question quiz.
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