Physical Layer Computer Networks Questions & Answers

1.

The physical layer is responsible for

   A.) line coding
   B.) modulation
   C.) channel coding
   D.) all of these

Answer: Option 'D'

all of these

2.

Wireless transmission can be done via

   A.) radio waves
   B.) microwaves
   C.) infrared
   D.) all of these

Answer: Option 'D'

all of these

3.

The portion of physical layer that interfaces with the media access control sublayer is called

   A.) physical data sublayer
   B.) physical signalling sublayer
   C.) physical address sublayer
   D.) none of these

Answer: Option 'B'

physical signalling sublayer

4.

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 these

Answer: Option 'D'

all of these

5.

Which transmission media has the highest transmission speed in a network?

   A.) twisted pair cable
   B.) coaxial cable
   C.) optical fiber
   D.) electrical cable

Answer: Option 'C'

optical fiber

6.

The physical layer concerns with

   A.) bit-by-bit delivery
   B.) process to process delivery
   C.) application to application delivery
   D.) none of these

Answer: Option 'A'

bit-by-bit delivery

8.

In asynchronous serial communication the physical layer provides

   A.) start and stop signalling
   B.) flow control
   C.) both (a) and (b)
   D.) none of these

Answer: Option 'C'

both (a) and (b)

9.

The physical layer translates logical communication requests from the ______ into hardware specific operations.

   A.) network layer
   B.) data link layer
   C.) trasnport layer
   D.) application layer

Answer: Option 'B'

data link layer

10.

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: Option 'A'

digital modulation


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