DHCP Questions

Question 1

What is a reason to use DHCPv6 on a network that uses SLAAC?

A. to get a record of the IPs that are used by the clients
B. to push DNS and other information to the clients
C. no reason, because there is no need for DHCPv6 when using SLAAC
D. because DHCPv6 can be used only in stateful mode with SLAAC to record the IPs of the clients
E. because DHCPv6 can be used only in stateless mode with SLAAC to record the IPs of the clients
F. because DHCPv6 is required to use first-hop security features on the switches

Answer: B

Explanation

SLAAC is by far the easiest way to configure IPv6 addresses, simply because you don’t have to configure any IPv6 address. With SLAAC, a host uses the IPv6 Neighbor Discovery Protocol (NDP) to determine its IP address and default routers. Using SLAAC, a host requests and listens for Router Advertisements (RA) messages, and then taking the prefix that is advertised to form a unique address that can be used on the network. For this to work, the prefix that is advertised must advertise a prefix length of 64 bits (i.e., /64). But the most significant of Stateless Address Autoconfiguration (SLAAC) is it provided no mechanism for configuring DNS resolver information.

Therefore SLACC can be used along with DHCPv6 (Stateless) to push DNS and other information to the clients.

Question 2

Which two DHCP messages are always sent as broadcast? (Choose two)

A. DHCPOFFER
B. DHCPDECLINE
C. DHCPRELEASE
D. DHCPREQUEST
E. DHCPDISCOVER

Answer: D E

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