Answer: D) Broadcast a gratuitous ARP Explanation: To stop possible address conflicts , a DHCP client will use gratuitous ARP (broadcast an ARP request for its own IP address) to see if another host responds.

Answer: C) The administrator must fix the conflict by hand at the DHCP server Explanation: If a DHCP Conflict is detected, either by the server sending a ping and getting response or by a host using a gratuitous ARP (arp'ing for its own IP address and seeing if a host responds), then the server will hold that address and not use it again until it is fixed by an administrator.

Answer: C) 10xxxxxx Explanation: The range of a  Class B network address is 128 - 191. This makes our binary range 10xxxxxx.

Answer: C) Class C Explanation: Class C network address has only 8 bits for defining hosts : 28-2 = 256 - 2 = 254

Answer: C) Proxy ARP Explanation: Proxy ARP can help machines on a subnet reach remote subnets without configuring routing or a default gateway.

Answer: C) Internet Explanation: The four layers of the DoD model are Application/process, Host-to-Host, Internet, and Network Access. The Internet layer is equivalent to the Network layer of the OSI model.

Answer: B) Host-to-Host Explanation: The four layers of the TCP/IP stack (also called the DoD model) are Application/process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.

Answer: D) DNS Explanation: DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.