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Computer Networks MCQ | IBPS RRB Computer Awareness Questions & Answers
1. Which is the name of the network topology in which there are bi-directional links between each possible node?
a.Star
b.Ring
c.Tree
d.Mesh
Answer: (d)
2. While transmitting odd-parity coded symbols, the number of zeros in each symbol is
a. odd
b. a and b both
c. even
d.unknown
e.None of these
Answer: (d)
3. What is the default subnet mask for a class C network?
a. 127.127.0.0.1
b. 127.255.255.0.0
c. 127.255.0.0.0
d. 127.255.255.255.0
e. 127.None of these
Answer: (d)
4. A communications device that combines transmissions from several I/O devices into one line is a ____________
a. concentrator
b. multiplexer
c. modifier
d. full-duplex line
e. None of these
Answer: (b)
5. In OSI network architecture, the routing is performed by
a. network layer
b. transport layer
c. data link layer
d. session layer
e. None of these
Answer: (a)
6. What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?
a. 4
b. 6
c. 2
d. 3
e. None of these
Answer: (d)
7. How much power (roughly) a light emitting diode can couple into an optical fiber?
a. 100 microwatts
b. 100 picowatt
c. 440 microwatts
d. 10 miliwatts
e. None of these
Answer: (a)
8. Which of the following statement is correct?
a. terminal section of a synchronous modem contains the scrambler
b. transmission section of a synchronous modem contains the scrambler
c. receiver section of a synchronous modem contains the scrambler
d. control section of a synchronous modem contains the scrambler
e. None of these
Answer: (b)
9. Which of the following statements is correct for the use of packet switching?
a. the subdivision of information into individually ad- dressed packets in conjunction with alternative rout- ing arrangement enabled the transmission path to be altered in the event of congestion or individual link failure
b. by employing wide bandwidth circuits for the trunk networks substantial economies through extensive shar- ing of capacity could be achieved.
c. the employment of additional intelligence within the network enabled more sophisticated error control and link control procedures to be applied
d. All of these
e. None of these
Answer: (d)
10. You are working with three networks that have the network IDs 192.168.5.0, 192.168.6.0, and 192.168.7.0. What subnet mask can you use to combine these addresses into one?
a. 255.255.252.0
b. 255.255.255.240
c. 225.255.254.0
d. 255.255.255.252
e. None of these
Answer: (a)
11. Which of the following might be used by a company to sat- isfy its growing communications needs?
a. front end processor
b. controller
c. multiplexer
d. concentrator
e. None of these
Answer: (e)
12. With an IP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts?
a. 192
b. 240
c. 224
d. 248
- 252
Answer: (e)
13. Which of the following transmission systems provide the highest data rate to in individual device?
a. computer bus
b. voice and mode
c. telephone lines
d. lease lines
e. None of these
Answer: (a)
14. A protocol is a set of rules governing a time sequence of events that must take place?
a. between an interface
b. between peers
c. between modems
d. across an interface
Answer: (d)
15. Mobile phone is an example of which type of communication channel?
a. Half duplex
b. Simplex
c. Full duplex
d. None of these
Answer: (c)
16. Ethernet, token ring and token bus are types of
a. LAN
b. WAN
c. communication channels
d. physical media
e. None of the above
Answer: (a)
17. ……… allows LAN users to share computer programs and data.
a. Print server
b. Communication server
c. File server
d. All of the above
Answer: (c)
18. Which of the following items is not used in Local Area Network (LANs)?
a. Cable
b. Interface card
c. Computer
d. Modem
Answer: (d)
19. What do we call a network whose elements may be separated by some distance? It usually involves two or more network and dedicated high speed telephone lines.
a. WAN
b. LAN
c. URL
d. Server
e. World Wide Web
Answer: (b)
20. Switches work on which OSI layer?
a. Physical layer
b. Data link layer
c. Transport layer
d. Network layer
e. Application layer
Answer: (b)