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CCNA QUESTIONS : PART 23

The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI model?

Application

Host-to-Host

Internet

Network Access

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Which of the following is the decimal and hexadecimal equivalents of the binary number 10011101?

155, 0x9B

157, 0x9D

159, 0x9F

 185, 0xB9

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Which statements are true regarding ICMP packets?

  1. They acknowledge receipt of a TCP segment.
  2. They guarantee datagram delivery.
  3. They can provide hosts with information about network problems.

They are encapsulated within IP datagrams.

1 only

2 and 3

3 and 4

2, 3 and 4

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

1. Application

2. Session

3. Transport

4. Internet

5. Data Link

6. Physical

1 and 2

1, 3 and 4

2, 3 and 5

3, 4 and 5

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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.

1 only

 2 and 3

1 and 4

All of the above

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

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

1 and 3

1, 3 and 5

3, 4 and 5

All of the above

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

RARP

ARP

IP

ICMP

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Which of the following protocols uses both TCP and UDP?

FTP

SMTP

 Telnet

DNS

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

01xxxxxx

0xxxxxxx

10xxxxxx

110xxxxx

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Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.

3, 3, 1, 7

3, 2, 1, none

 3, 2, 1, 7

3, 3, 2, none

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A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?

Send a different source port number.

Restart the virtual circuit.

Decrease the sequence number.

Decrease the window size.

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What is the purpose of flow control?

To ensure that data is retransmitted if an acknowledgment is not received

To reassemble segments in the correct order at the destination device.

To provide a means for the receiver to govern the amount of data sent by the sender.

To regulate the size of each segment.

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Which of the following are types of flow control?

  1. Buffering
  2. Cut-through
  3. Windowing
  4. Congestion avoidance

1 and 2

1, 3 and 4

2 only

3 only

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