Module 2 / Unit 4 / DHCP and APIPA

Question 1

What is the advantage of having a DHCP server in a TCP/IP network?

Answer 1

It simplifies the configuration of TCP/IP on the client computers and reduces the chance of errors.

Question 2

What port should be open on the client for it to negotiate with a DHCP server?

Answer 2

UDP port 68.

Question 3

True or false? If a client accepts a DHCPOFFER, the DHCPREQUEST packet is broadcast on the network.

Answer 3

True.

Question 4

If a network adapter is using the address 169.254.1.10 on a host connected to the LAN, what would you suspect?

Answer 4

That a DHCP server is offline (the system is configured to obtain an address automatically but cannot contact a DHCP server and is using APIPA).

Question 5

On the DHCP server, what is a range of IP addresses that are available to be leased or assigned to clients called?

Answer 5

Scope

Question 6

When configuring multiple DHCP servers for redundancy, what should you take care to do?

Answer 6

Configure the servers with non-overlapping scopes.

Question 7

True or false? DHCP options can be configured on a per-scope basis.

Answer 7

True

Question 8

What is an RFC 1542 compliant router?

Answer 8

One that can forward DHCP traffic to and from remote networks (using IP helper for instance).

Question 9

What address is used to contact a DHCPv6 server?

Answer 9

IPv6 does not support broadcast so clients use the multicast address ff:02::1:2 to discover a DHCP server.

Question 10

In a stateless environment, what sort of information does DHCPv6 provide?

Answer 10

In a stateless environment, the host autoconfigures an address using a network prefix provided by the router (typically). DHCPv6 is then used to provide the IPv6 addresses used to access network services, such as DNS or SIP gateways.