CCNP Exam Prep Tips and Must Knows

Things You Need to Know About DHCP

DHCP service

• clients in access VLANs need DHCP service
• DHCP service can be provided by the Distribution Switches or external DHCP server elsewhere in the network

DHCP configuration

• switch (config) #ip dhcp excluded-address 10.1.10.1 10.1.10.20
• switch (config) #ip dhcp pool Test
• switch (config-dhcp)# network 10.1.10.0 255.255. 255.0
• switch (config-dhcp)#default-router 10.1.10.1
• switch (config-dhcp)#option 150 10.1.1.50
• switch (config-dhcp)#lease 0 8 0
• switch (config)#interface vlan10
• switch (config-if)#IP address 10.1.10.1 255.255.255.0

DHCP with the IP helper command

• switch (config)# interface vlan 10
• switch (config-if)#ip address 10.1.10.1 255.255.255.0
• switch (config-if)#ip helper 10.1.100.1

Make sure you can configure:

• DHCP Pool
• Excluded addresses
• Helper Address          

Make sure you are familiar with:

• Show ip dhcp binding
• Show ip dhcp conflict