TCP/IP Questions and Answers

Answer: B

This seems like a hard question at first because it doesn't make sense. The listed answers are from the OSI model and the question asked about the TCP/IP protocol stack (DoD model). However, let's just look for what is wrong. First, the Session layer is not in the TCP/IP model; neither are the Data Link and Physical layers. This leaves us with the Transport layer (Host-to-Host in the DoD model), Internet layer (Network layer in the OSI), and Application layer (Application/Process in the DoD).

Answer: C

Dynamic Host Configuration Protocol (DHCP) is used to provide IP information to hosts on your network. DHCP can provide a lot of information, but the most common is IP address, subnet mask, default gateway, and DNS information.

Answer: D

Correct answer: 192.168.24.43

The private ranges defined by RFC 1918 are 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. Only the last option falls in one. The trap is 172.15.14.36, which is outside the private block - that range begins at 172.16 and ends at 172.31, so 172.15 and 172.32 are both public.

Answer: C

Correct answer: Proxy ARP

Proxy ARP lets a router answer an ARP request on behalf of a host on another network, supplying its own MAC address so that the sender forwards the frame to the router, which then routes it onward. It exists for hosts that have no default gateway configured or that believe the whole address range is local. RARP and inverse ARP work in the opposite direction, resolving an address from a known hardware or circuit identifier.