CCNA Certification/Configuration

= Configuration =

Getting started with Cisco
The basic router prompt, called user exec mode, - If it's not properly configured means, Router >

If it's configured properly means, Hostname of router >

Modes Router>? or Router>show ? Router# - privileged exec mode

Configuring your Cisco Router Router#show interfaces Router#show ip protocols Router#show ip route Router#show ip arp

Then go to the global configuration mode... Router#config Router(config)#

Configuring Hostname

Router(config)#hostname ExampleName ExampleName(config)#

Designate the DNS server ExampleName(config)#ip name-server aa.bb.cc.dd ExampleName(config)#ctrl-Z ExampleName# Then save configuration using CTRL+Z

Configure Serial and Ethernet Interfaces ExampleName#config terminal ExampleName(config)#interface ethernet 0/1 ExampleName(config-if)#ip address 192.168.10.1 255.255.255.0 ExampleName(config-if)#[Ctrl-Z]

ExampleName#config ExampleName(config)#interface serial 1/1 ExampleName(config-if)#ip address 192.168.155.2 255.255.255.0 ExampleName(config-if)#no shutdown ExampleName(config-if)#ctrl-Z ExampleName#

Note the no shutdown command. An interface may be correctly configured and physically connected, yet be "administratively down". In this state it will not function. The command for causing an interface to be administratively down is shutdown.

Configuring Cisco Routing

ExampleName(config)#ip routing ExampleName(config)#ctrl-Z ExampleName#config ExampleName(config)#ip route 172.16.0.0 255.255.255.0 192.168.150.1 ExampleName(config)#ctrl-Z ExampleName#show ip route

Configuring Access Lists and Network Security

Interface Serial0 ip access-group 101 in ip access-group 6 out access-list 10 permit 234.5.6.12 access-list 10 deny 5.10.10.32 0.0.0.31 access-list 10 permit 5.10.0.0 0.0.255.255 access-list 10 permit 123.234.0.0 0.0.0.255

access-list 101 permit tcp any any established access-list 101 permit tcp any 204.34.5.25 host eq 80 access-list 101 permit ip 203.45.34.0 0.0.0.255 204.34.5.0 0.0.0.255 access-list 101 permit tcp 203.44.32.0 0.0.0.31 204.34.5.0 0.0.0.255 eq telnet access-list 101 permit tcp any 204.34.5.10 eq smtp