CCNA (TCP/IP Question 19)

What is the address range of a Class B network address in binary?

A. 01xxxxxx

B. 0xxxxxxx

C. 10xxxxxx

D. 110xxxxx


Answer & Explanation
Answer: Option C

Explanation:

The range of a Class B network address is 128-191. This makes our binary range 10xxxxxx.

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CCNA (TCP/IP Question 18)

 
Which of the following protocols uses both TCP and UDP?

A. FTP

B. SMTP

C. Telnet

D. DNS



Answer & Explanation
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.

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CCNA (TCP/IP Question 17)

What protocol is used to find the hardware address of a local device?

A. RARP

B. ARP

C. IP

D. ICMP



Answer & Explanation
Answer: Option B

Explanation:

Address Resolution Protocol (ARP) is used to find the hardware address from a known IP address.

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CCNA (TCP/IP Question 16)

Which of the following are TCP/IP protocols used at the Application layer of the OSI model?

1. 
   
2. IP
3. TCP
4. Telnet
5. FTP
6. TFTP

A. 1 and 3

B. 1, 3 and 5

C. 3, 4 and 5

D. All of the above



Answer & Explanation
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.

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CCNA (TCP/IP Question 15)

 
Which statements are true regarding ICMP packets?

1. ICMP guarantees datagram delivery.
2. ICMP can provide hosts with information about network problems.
3. ICMP is encapsulated within IP datagrams.
4. ICMP is encapsulated within UDP datagrams.

A. 1 only

B. 2 and 3

C. 1 and 4

D. All of the above



Answer & Explanation
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.

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CCNA (TCP/IP Question 14)

Which layer 4 protocol is used for a Telnet connection?

A. IP

B. TCP

C. TCP/IP

D. UDP


Answer & Explanation
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.

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CCNA (TCP/IP Question 13)

Which of the following are layers in the TCP/IP model?

1. Application
2. Session
3. Transport
4. Internet
5. Data Link
6. Physical

A. 1 and 2

B. 1, 3 and 4

C. 2, 3 and 5

D. 3, 4 and 5



Answer & Explanation
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).

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