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Chapter 2
The Open Systems Interconnection Specifications
Review Questions

Оглавление

You can find the answers in Appendix B.

1. Host 1 sent a SYN packet to Host 2. What will Host 2 send in response?

A. ACK

B. NAK

C. SYN/ACK

D. SYN/NAK

E. SYN

2. TCP and UDP reside at which layer of the OSI model?

A. 1

B. 2

C. 3

D. 4

3. Which layer of the OSI model provides a user interface in the form of an entry point for programs to access the network infrastructure?

A. Application

B. Transport

C. Network

D. Physical

4. You are connected to a server on the Internet and you click a link on the server and receive a time-out message. What layer could be the source of this message?

A. Application

B. Transport

C. Network

D. Physical

5. Which layer of the OSI model is responsible for code and character-set conversion as well as recognizing data formats?

A. Application

B. Presentation

C. Session

D. Network

6. At which layers of the OSI model do bridges, hubs, and routers primarily operate, respectively?

A. Physical, Physical, Data Link

B. Data Link, Data Link, Network

C. Data Link, Physical, Network

D. Physical, Data Link, Network

7. Which layer of the OSI model is responsible for converting data into signals appropriate for the transmission medium?

A. Application

B. Network

C. Data Link

D. Physical

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

A. Send a different source port number.

B. Restart the virtual circuit.

C. Decrease the sequence number.

D. Decrease the window size.

9. Which Layer 1 devices can be used to enlarge the area covered by a single LAN segment? (Choose two.)

A. Firewall

B. NIC

C. Hub

D. Repeater

E. RJ-45 transceiver

10. Segmentation of a data stream happens at which layer of the OSI model?

A. Physical

B. Data Link

C. Network

D. Transport

11. When data is encapsulated, which is the correct order?

A. Data, frame, packet, segment, bits

B. Segment, data, packet, frame, bits

C. Data, segment, packet, frame, bits

D. Data, segment, frame, packet, bits

12. What are two purposes for segmentation with a bridge? (Choose two.)

A. To add more broadcast domains

B. To create more collision domains

C. To add more bandwidth for users

D. To allow more broadcasts for users

13. Acknowledgments, sequencing, and flow control are characteristic of which OSI layer?

A. Layer 2

B. Layer 3

C. Layer 4

D. Layer 7

14. Which of the following is true regarding sequencing and acknowledgments? (Choose all that apply.)

A. The segments delivered are acknowledged back to the sender upon their reception.

B. If a segment is not received, the virtual circuit must be restarted from the beginning at a slower transmit interval.

C. Any segments not acknowledged are retransmitted.

D. Segments are sequenced back into their proper order upon arrival at their destination.

E. All segments are retransmitted on time slot intervals.

15. What is the purpose of flow control?

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

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

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

D. To regulate the size of each segment

16. At which layer of the OSI model would you find IP?

A. Transport

B. Network

C. Data Link

D. Physical

17. Of the following, which is the highest layer in the OSI model?

A. Transport

B. Session

C. Network

D. Presentation

18. Routers perform routing at which OSI layer?

A. Physical

B. Data Link

C. Network

D. Transport

E. Application

19. Which of the following mnemonic devices can you use to remember the first letter of the name of each layer of the OSI model in the proper order?

A. All People Seem To Need Processed Data.

B. Always Should People Never Threaten Dog Police.

C. Please Do Not Throw Sausage Pizza Away.

D. All Day People Should Try New Professions.

20. Which IEEE standard specifies the protocol for CSMA/CD?

A. 802.2

B. 802.3

C. 802.5

D. 802.11

CompTIA Network+ Study Guide

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