Computer Networks Questions & Answers – Reference Models – 1 MCQ أسئله شبكات بالأجابات الجزء الرابع

 Computer Networks Questions & Answers – Reference Models –1

1. The number of layers in Internet protocol stack
a) 5
b) 7
c) 6
d) None of the mentioned

Answer: a
Explanation: There are five layers in the Internet Protocol stack. The five layers in Internet Protocol stack is Application, Transport, Network, Data link and Physical layer.

2. The number of layers in ISO OSI reference model
a) 5
b) 7
c) 6
d) None of the mentioned

Answer: b
Explanation: The seven layers in ISO OSI reference model is Application, Presentation, Session, Transport, Network, Data link and Physical layer.

3. This layer is an addition to OSI model when compared with TCP IP model
a) Application layer
b) Presentation layer
c) Session layer
d) Both Session and Presentation layer

Answer: d
Explanation: The only difference between OSI model and TCP/IP model is that in OSI model two layers namely Presentation and Session layer have been added.

4. Application layer is implemented in
a) End system
b) NIC
c) Ethernet
d) None of the mentioned

Answer: a
Explanation: Not only application layer, but presentation layer, session layer and transport layer are also implemented in the end system.

5. Transport layer is implemented in
a) End system
b) NIC
c) Ethernet
d) None of the mentioned

Answer: a
Explanation: Application, Presentation, Session and Transport layer are implemented in the end system.

6. The functionalities of presentation layer includes
a) Data compression
b) Data encryption
c) Data description
d) All of the mentioned

Answer: d
Explanation: Some functions of the presentation layer include character-code translation, data conversion, data encryption and decryption, and data translation.

7. Delimiting and synchronization of data exchange is provided by
a) Application layer
b) Session layer
c) Transport layer
d) Link layer

Answer: b
Explanation: The session layer provides the mechanism for opening, closing and managing a session between end-user application processes. The session layer 5 is responsible for establishing managing synchronizing and terminating sessions.

8. In OSI model, when data is sent from device A to device B, the 5th layer to receive data at B is
a) Application layer
b) Transport layer
c) Link layer
d) Session layer

Answer: d
Explanation: In OSI reference model, the fifth layer is Session layer. Session layer provides the mechanism for opening, closing and managing a session between end-user application processes.

9. In TCP IP Model, when data is sent from device A to device B, the 5th layer to receive data at B is
a) Application layer
b) Transport layer
c) Link layer
d) Session layer

Answer: a
Explanation: In TCP/IP model, the fifth layer is application layer. when data is sent from device A to device B, the 5th layer to receive data at B is application layer.

10. In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______
a) Added
b) Removed
c) Rearranged
d) None of the mentioned

Answer: b
Explanation: In OSI reference model, when data packet moves from lower layers to higher layer, headers get removed. Whereas when data packet move from higher layer to lower layers, headers are added.

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