Ccna - Configuring Ccna Dynamic Dhcp On A Cisco Router Part 2

For the CCNA certification you must have a solid understanding in how to configure Dynamic Host Configuration Protocol (DHCP) on a Cisco router to serve IP address information to one or multiple subnets

Step 1: The first step is to enable the DHCP service on the Cisco Router
Router(config)# service dhcp
This command enables the Cisco DHCP server on the Router and relay features on your router.
To remove the command use the same command with no at the beginning

Configuring the DHCP Pool Name
Configure the DHCP pool name and, use the following command in global configuration mode:
Router(config)# ip dhcp pool name
This command creates a name for the DHCP Server IP address pool and puts you into DHCP pool configuration mode, the prompt changes to dhcp-config# .

Setting up the DHCP Address Pool Subnet and Mask
Next step is to setup a subnet and mask for the DHCP address pool you just created. This pool contains the valid range of IP addresses which the DHCP Server will assign to DHCP clients:
Router(dhcp-config)# network network-number [mask | /prefix-length]
The prefix length indicates the number of bits which make up the address prefix. The prefix is the alternative way to specify the network mask of the client.

Setting up the Domain Name for the Client
The domain name for a DHCP client puts the client into that domain.
Router(dhcp-config)# domain-name domain
Setting up the IP Domain Name System Servers for the Client
When DHCP clients query DNS IP servers when they need to resolve host names or URLS to IP addresses.
Router(dhcp-config)# dns-server address [address2 ... address5]
Specifies the IP address of a DNS server that is available to a DHCP client. Only one IP address is needed but you can configure up to 8 of them.

Configuring the Default Router for the Client
The DHCP client needs to route off of the network and needs to know the IPaddress of the default gateway or default router. The IP address of the default router has to be on the same subnet as the DHCP client.
Router(dhcp-config)# default-router address [address2 ... address8]
Specifies the IP address of a DNS server that is available to a DHCP client. Only one IP address is needed but you can configure up to 8 of them.

Setting up the Address Lease Time
The default lease time for each IP address assigned by a DHCP Server one-day. This is the period of time which the leased address is valid. To change the lease value for an IP address:
Router(dhcp-config)# lease {days [hours][minutes] | infinite}


Configuring Dynamic DHCP on a Cisco Router Part 2
For the CCNA certification you must have a solid understanding in how to configure Dynamic Host Configuration Protocol (DHCP) on a Cisco router to serve IP address information to one or multiple subnets


Example Configuration of DHCP
Router(config)# service dhcp
Router(config)# ip dhcp pool CCNA
Router(dhcp-config)# network 10.1.1.0 255.255.255.0
Router(dhcp-config)# domain-name COMMSUPPORT.LOCAL
Router(dhcp-config)# dns-server 10.1.1.1
Router(dhcp-config)# default-router 10.1.1.254
Router(dhcp-config)# lease 5 2 3
The above configuration will assign an address in the range between 10.1.1.2 and 10.1.1.253 to any DHCP client, the DHCP server will also tell the DHCP client that the domain name is commsupport.local, that the DNS server on the subnet is 10.1.1.1, to use a gateway known as 10.1.1.254 and to hold onto the address for 5 days 2 hours and 3 minutes

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