no sh (no shutdown : start the interface)
router rspf 1
network x.x.x.x x.x.x.x area 0
int (interface)
show ip route (to see routing table entries)
RIP
Rtr(config)#router rip (enable RIP routing process)
Rtr(config-router)#network (associates a network with a RIP routing)
Rtr#debug ip rip (used to view real time RIP routing updates)
Rtr(config-router)#default-information (used by RIP to propagate default routes)
Rtr#show ip protocols (used to display times used by RIP)
Rtr(config)#no router rip (disables RIP routing process)
2 devices to protect a network :
- firewall
- IDS/IPS (instruction detection system / instruction prevention system)
show running-config (显示密码)
service password-encryption
end(和上面共同作用加密密码，是的show running-config不能再显示出密码)
show file system (show the file system used b Cisco)
show access-lists
show running-config | include access-list
no access-list 20
access-list 20 permit x.x.x.x
access-list 20 deny x.x.x.x x.x.x.x
access-list 1 permit x.x.x.x x.x.x.x (to create an entry in a standard IPv4 ACL)
interface FastEthernet 0/0 (to select an interface to which to apply the ACL)
ip access-group 1 out (to activate the existing ACL on an interface)
show run (show runningxxx?)
ifconfig (查看网络配置)
reload (to reload the operating system)