Computer Networks multiple choice questions set 04

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Computer Networks MCQ - SET 04

 

1. Hubs and switches are similar in that they both:

(a) are passive devices

(b) are manufactured by Microsoft

(c) use MAC address

(d) work in physical layer

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Ans : (c)

Answer: (c) use MAC address A network switch is a computer networking device which connects various devices together on a single computer network. A hub is the most basic networking device that connects multiple computers or other network devices together. Both hub and switch use MAC address for data transmission. [Refer here]

 

2. The Cyclic Redundancy Check (CRC) used on data frames in Ethernet LANs provides:

(a) very powerful error detection

(b) very powerful error correction

(c) very powerful error detection and error correction

(d) very strong encryption

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Ans : (a)

Answer: (a) very powerful error detection Cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. A cyclic redundancy check (CRC) calculation is superior to a checksum; however, the calculation is much more complex. The cyclic redundancy check (CRC) method is particularly effective for dealing with burst errors caused by impulsive noise, and is extensively used for magnetic recording of data.

 

3. CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is a data link layer protocol that does the following.

(a) Allows client browser to request Web pages (objects) from a Web server

(b) Efficient MAC protocol for classic Ethernet LANs

(c) Shares use of a physical channel on a time slot basis

(d) All of the above

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Ans : (b)

Answer: (b) Efficient MAC protocol for classic Ethernet LANs Carrier-sense multiple access with collision detection (CSMA/CD) is a media access control (MAC) method used most notably in early Ethernet technology for local area networking. It uses carrier-sensing to defer transmissions until no other stations are transmitting. CSMA/CD is a type of contention protocol. Standard Ethernet networks use CSMA/CD to physically monitor the traffic on the line at participating stations.

 

4. Making decisions about the paths used for datagrams to reach destination is called ______ .

(a) routing

(b) forwarding

(c) translating

(d) networking

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Ans : (a)

Answer: (a) routing Routing is the process of moving the packet along the route. Routing is the process of selecting a path for traffic in a network or between or across multiple networks. Broadly, routing is performed in many types of networks, including circuit-switched networks, such as the public switched telephone network (PSTN), and computer networks, such as the Internet. [Wikipedia]  The network layer provides host-to-host communication and is responsible for routing packets (called datagrams at the network layer) from a source host to a destination host.

 

5. Which of the following technology/concept shares the use of physical channel on a time slot basis?

(a) IP (Internet Protocol)

(b) HTTP (Hyper Text Transfer Protocol)

(c) CSMA/CD (Carrier Sense Multiple Access with Collision Detection)

(d) TDM (Time Division Multiplexing)

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Ans : (d)

Answer: (d) TDM (Time Division Multiplexing) Multiplexing allows for a physical link to be shared by multiple users to fully use the link and reduce the number of input/output (I/O) ports required for a computer. Time division multiplexing (TDM)—synchronous TDM: Multiple digital signals or analog signals carrying digital data can be carried on a single transmission path by interleaving portions of each signal in time. The interleaving interval can be one bit, one octet, or one block of a fixed size of octets. Each signal or connection path takes a fixed time slot but use the whole bandwidth of the link. [Reference: Chen, W. K. (2004). The electrical engineering handbook. Elsevier.] Time division multiplexing uses the fact that light takes a finite time to travel the distance from the source to the FBG and back. This time increases as the distance between the FBG and the source increases.

 

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Related links

 

• Computer Networks MCQ home page

 

How hubs and switches are similar

Cyclic redundancy check (CRC) provides powerful error detection

What is the role of CSMA/CD

MCQ with answer in IoT

What is routing? Who facilitates routing?

On which fact does the Time Division Multiplexing (TDM) work?