Network Configuration Cheat Sheet

Switch Basic Configuration
enable
configure terminal
hostname SWITCH1
no ip domain-lookup
service password-encryption
banner motd #Unauthorized access prohibited#
line console 0
 password cisco
 login
exit
line vty 0 4
 password cisco
 login
exit
VLAN Configuration
configure terminal
vlan 10
 name SALES
vlan 20
 name HR
exit
interface fastEthernet 0/1
 switchport mode access
 switchport access vlan 10
exit
interface fastEthernet 0/2
 switchport mode access
 switchport access vlan 20
exit
Inter-VLAN Routing (Router-on-a-Stick)
interface gigabitEthernet 0/0
 no shutdown

interface gig0/0.10
 encapsulation dot1Q 10
 ip address 192.168.10.1 255.255.255.0

interface gig0/0.20
 encapsulation dot1Q 20
 ip address 192.168.20.1 255.255.255.0
Router Basic Configuration
enable
configure terminal
hostname ROUTER1
no ip domain-lookup
service password-encryption
interface gig0/0
 ip address 10.0.0.1 255.255.255.0
 no shutdown
exit
interface gig0/1
 ip address 192.168.1.1 255.255.255.0
 no shutdown
exit
Static Routing
configure terminal
ip route 192.168.20.0 255.255.255.0 10.0.0.2
ip route 0.0.0.0 0.0.0.0 192.168.1.254
DHCP Server (Cisco Router)
configure terminal
ip dhcp pool SALES
 network 192.168.10.0 255.255.255.0
 default-router 192.168.10.1
 dns-server 8.8.8.8
exit
ip dhcp excluded-address 192.168.10.1 192.168.10.10
NAT Configuration
access-list 1 permit 192.168.1.0 0.0.0.255
interface gig0/1
 ip nat inside
interface gig0/0
 ip nat outside
ip nat inside source list 1 interface gig0/0 overload
ACL Configuration
access-list 100 deny tcp any any eq 23
access-list 100 permit ip any any
interface gig0/1
 ip access-group 100 in