Configuring Network Services for the CCENT Certification Exam
This section reviews popular commands used when configuring a Cisco device for name resolution, DHCP services, and NAT. You’ll need to know these for the CCENT Certification exam.
The following commands configure the hostname table on a router and display the entries in the hostname table:
NY-R1>enable NY-R1#config term NY-R1(config)#ip host BOS-R1 126.96.36.199
To verify that the entry has been added:
NY-R1(config)#exit NY-R1#show hosts
The following commands enable DNS lookups and specify the DNS server of 188.8.131.52 to send DNS queries to. The domain name is also set to gleneclarke.com.
NY-R1>enable NY-R1#config term NY-R1(config)#ip domain-lookup NY-R1(config)#ip name-server 184.108.40.206 NY-R1(config)#ip domain-name gleneclarke.com
The following commands configure your router as a DHCP server by setting an address pool (range of addresses to give out) and setting up excluded addresses that are not to be given out. The lease time is set to 7 days in this example.
NY-R1(config)#ip dhcp pool NY_Network NY-R1(dhcp-config)#network 220.127.116.11 255.0.0.0 NY-R1(dhcp-config)#default-router 18.104.22.168 NY-R1(dhcp-config)#dns-server 22.214.171.124 NY-R1(dhcp-config)#lease 7 0 0 NY-R1(dhcp-config)#exit NY-R1(config)#ip dhcp excluded-address 126.96.36.199 188.8.131.52
The following commands configure NAT overload services on a router called NY-R1. In this example, a list of source addresses is created in access list #1, which is then used as the inside source list. The FastEthernet 0/0 port is the overloaded public address port that all inside addresses get translated to.
NY-R1(config)#Access-list 1 permit 10.0.0.0 0.255.255.255 NY-R1(config)#ip nat inside source list 1 interface FastEthernet 0/0 overload NY-R1(config)#interface FastEthernet0/0 NY-R1(config-if)#ip nat outside NY-R1(config-if)#interface FastEthernet0/1 NY-R1(config-if)#ip nat inside