DNS/DHCP configuration

Question 1

How do you enable a router to act as a DNS server?

Answer 1

()ip dns server

Question 2

What command would you use to verify DHCP configuration on a Cisco device?

Answer 2

sh dhcp lease

Question 3

What command would you use to enable DHCP on a router if you didn’t have a static public ip?

Answer 3

Enable on the ISP-facing interface:

(if)ip address dhcp

Question 4

What command would you use to verify IP settings on Mac?

Answer 4

ip address show

ifconfig

Question 5

What command would you use to verify IP settings on Linux?

Answer 5

ifconfig

Question 6

How do you view the default gateway on Mac?

Answer 6

Netstat -rn

Question 7

How do you view the default gateway on Linux?

Answer 7

ip route show

Question 8

How do you configure IP relay capability on a Cisco router?

Answer 8

On the client facing interface enable ip helper and point it to the DHCP server’s address:

(if)ip helper-address 10.10.10.10

Question 9

What should you specify first when using a router as a DHCP server?

Answer 9

List excluded addresses from the DHCP pool:

()ip dhcp excluded-address 1.1.1.1

A good one to add is router’s own interfaces:
show ip interface brief

Question 10

How do you give a name to a DHCP pool?

Answer 10

()ip dhcp pool 10.10.10.0 namehere

Question 11

How do you specify the network range and subnet mask for cisco DHCP?

Answer 11

()ip dhcp pool namehere

(dhcp)network 10.10.10.0 255.255.255.0

Question 12

How do you view the dhcp pool on a router?

Answer 12

show ip dhcp pool

Question 13

how do you view the distributed addresses on a router?

Answer 13

show ip dhcp binding

Question 14

How do you configure the default route for IOS DHCP?

Answer 14

To the default gateway for the devices:

()ip dhcp pool namehere
(dhcp) default-router 10.10.10.1

Question 15

How do you specify the DNS server for IOS DHCP server?

Answer 15

Then specify the DNS server for the devices

()ip dhcp pool namehere
(dhcp)dns-server 10.10.20.10