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PHYSICAL LAYER

1. The IETF standards documents are called

a) RFC
b) RCF
c) ID
d) None of the mentioned

Answer: a
2. In the layer hierarchy as the data packet moves from the upper to the lower layers, headers are
a) Added
b) Removed
c) Rearranged
d) Modified
Answer: a
Explanation: Every layer adds its own header to the packet from previous layer.

3. The structure or format of data is called
a) Syntax
b) Semantics
c) Struct
d) None of the mentioned
Answer: a
Explanation: Semantics defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation.

4. Communication between a computer and a keyboard involves ______________ transmission
a) Automatic
b) Half-duplex
c) Full-duplex
d) Simplex

Answer: d
Explanation: Data flows in single direction.

5. The first Network
a) CNNET
b) NSFNET
c) ASAPNET
d) ARPANET
Answer: d
Explanation: None.

6. The _______ is the physical path over which a message travels
a) Path
b) Medium
c) Protocol
d) Route
Answer: b
Explanation: Message travel from sender to reciever via a medium using a protocol.

7. Which organization has authority over interstate and international commerce in the communications field?
a) ITU-T
b) IEEE
c) FCC
d) ISOC
Answer: c
Explanation: None.

8. Which of this is not a network edge device?
a) PC
b) Smartphones
c) Servers
d) Switch
Answer: d
Explanation: Network egde devices refer to host systems, which can host applications like web browser.

9. A set of rules that governs data communication
a) Protocols
b) Standards
c) RFCs
d) None of the mentioned
Answer: a
Explanation: None.

10. Three or more devices share a link in ________ connection
a) Unipoint
b) Multipoint
c) Point to point
d) None of the mentioned
Answer:b
Explanation: None.

11. The physical layer concerns with
a) bit-by-bit delivery
p) process to process delivery
c) application to application delivery
d) none of the mentioned
Answer: a
Explanation: None.

12. Which transmission media has the highest transmission speed in a network?
a) coaxial cable
b) Twisted pair cable
c) Optical fiber
d) electrical cable

      Answer: c

Explanation: None.

13. Bits can be send over guided and unguided media as analog signal by
a) Digital modulation
b) Amplitude modulation
c) Frequency modulation
d) Phase modulation

Answer: a
Explanation: None.

14. The portion of physical layer that interfaces with the media access control sublayer is called
a) physical signalling sublayer
b) physical data sublayer
c) physical address sublayer
d) none of the mentioned

Answer: a
Explanation: None.

15. physical layer provides
a) mechanical specifications of electrical connectors and cables
b) electrical specification of transmission line signal level
c) specification for IR over optical fiber
d) all of the mentioned

Answer: d
Explanation: None.

16. In asynchronous serial communication the physical layer provides
a) start and stop signalling
b) flow control
c) both start & stop signalling and flow control
d) none of the mentioned

Answer: c
Explanation: None.

17. The physical layer is responsible for
a) line coding
b) channel coding
c) modulation
d) all of the mentioned

Answer: d
Explanation: None.

18. The physical layer translates logical communication requests from the ______ into hardware specific operations.
a) data link layer
b) network layer
c) trasnport layer
d) application layer

Answer: a
Explanation: None.

19. A single channel is shared by multiple signals by
a) Analog modulation
b) Digital modulation
c) Multiplexing
d) None of the mentioned

Answer: c
Explanation: None.

20. Wireless transmission can be done via
a) radio waves
b) microwaves
c) infrared
d) all of the mentioned

Answer: d
Explanation: None.

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

Answer: a
Explanation: None.

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

Answer: b
Explanation: None.

23. 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: None.

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

Answer: a
Explanation: None.

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

Answer: a
Explanation: None.

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

Answer: d
Explanation: None.

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

Answer: b
Explanation: None.

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

Answer: d
Explanation: None.

29. 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: None.

30. 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: None.

31. Identify the statement which cannot be associated with OSI model
a) A structured way to discuss and easier update syatem components
b) One layer may duplicate lower layer functionality
c) Functionality at one layer no way requires information from another layer
d) None of the mentioned

Answer: c
Explanation: One layer may use the information from another layer Ex: time stamp value.