1. | What is the address range of a Class B network address in binary? |
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Answer: Option C Explanation: The range of a Class B network address is 128-191. This makes our binary range 10xxxxxx. |
2. | Which of the following protocols uses both TCP and UDP? |
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Answer: Option D Explanation: DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address. |
3. | What protocol is used to find the hardware address of a local device? |
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Answer: Option B Explanation: Address Resolution Protocol (ARP) is used to find the hardware address from a known IP address. |
4. | Which of the following are TCP/IP protocols used at the Application layer of the OSI model?
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Answer: Option C Explanation: Telnet, File Transfer Protocol (FTP), and Trivial FTP (TFTP) are all Application layer protocols. IP is a Network layer protocol. Transmission Control Protocol (TCP) is a Transport layer protocol. |
5. | Which statements are true regarding ICMP packets?
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Answer: Option B Explanation: ICMP is used for diagnostics and destination unreachable messages. ICMP is encapsulated within IP datagrams, and because it is used for diagnostics, it will provide hosts with information about network problems. |
6. | Which layer 4 protocol is used for a Telnet connection? |
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Answer: Option B Explanation: Although Telnet does use TCP and IP (TCP/IP), the question specifically asks about layer 4, and IP works at layer 3. Telnet uses TCP at layer 4. |
7. | Which of the following are layers in the TCP/IP model?
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Answer: Option B Explanation: 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). |
8. | Which statements are true regarding ICMP packets?
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Answer: Option C Explanation: Internet Control Message Protocol (ICMP) is used to send error messages through the network, but they do not work alone. Every segment or ICMP payload must be encapsulated within an IP datagram (or packet). |