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UGC NET · Computer Science

Computer Networks Previous Year Questions (page 2)

58 Computer Networks (Computer Science) questions asked in UGC NET previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.

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Other Computer Science topics

DBMS & SQL 85Operating Systems 66Data Structures 57Digital Logic & Number Systems 41Computer Organization & Architecture 29Algorithms 25OOP 24Programming in C/C++ 19Software Engineering 17Java 11Discrete Mathematics 9AI, ML & Data Science 8Web Technologies 8Computer Graphics & Multimedia 8
Q51UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
The IP address ______ is used by hosts when they are being booted.
  1. A0.0.0.0
  2. B1.0.0.0
  3. C1.1.1.1
  4. D255.255.255.255
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Correct answer: (A) 0.0.0.0

Explanation

The address 0.0.0.0 is used by a host as its source address while it is booting (e.g. in a DHCP request) before it knows its own IP address.

Q52UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
Which of the given wireless technologies used in IoT, consumes the least amount of power?
  1. AZigbee
  2. BBluetooth
  3. CWi-Fi
  4. DGSM/CDMA
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Correct answer: (B) Bluetooth

Explanation

As keyed by the book, Bluetooth (in its low-energy form) consumes the least power among the options; Wi-Fi and GSM/CDMA consume much more.

Q53UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
Which of the following is correct statement?
  1. AIn memory-mapped I/O, the CPU can manipulate I/O data residing in interface registers that are not used to manipulate memory words
  2. BThe isolated I/O method isolates memory and I/O addresses so that memory address range is not affected by interface address assignment
  3. CIn asynchronous serial transmission of data the two units share a common clock
  4. DIn synchronous serial transmission of data two units have different clocks
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Correct answer: (B) The isolated I/O method isolates memory and I/O addresses so that memory address range is not affected by interface address assignment

Explanation

The isolated I/O method isolates memory and I/O addresses so that the memory address range is not affected by interface address assignment. Memory-mapped I/O uses the same address space for memory and I/O devices. In asynchronous serial transfer the two units do not share a common clock; in synchronous serial transfer they do.

Q54UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
Quadrature Amplitude Modulation means changing both :
  1. AFrequency and phase of the carrier
  2. BFrequency and amplitude of the carrier
  3. CAmplitude and phase of the carrier
  4. DAmplitude and wavelength of the carrier
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Correct answer: (C) Amplitude and phase of the carrier

Explanation

Quadrature amplitude modulation means changing both amplitude and phase of the Carrier.

Q55UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
Match the following : List-I A. Data link layer B. Network layer C. Transport layer D. Presentation layer List-II i. Encryption ii. Connection control iii. Routing iv. Framing Code : A B C D
  1. Aiv iii i ii
  2. Biii iv ii i
  3. Civ ii iii i
  4. Div iii ii i
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Correct answer: (D) iv iii ii i

Explanation

Data link layer - framing (iv); Network layer - routing (iii); Transport layer - connection control (ii); Presentation layer - encryption (i).

Q56UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
The address of a class B host is to be split into subnets with a 6-bit subnet number. What is the maximum number of subnets and maximum number of hosts in each subnet?
  1. A62 subnets and 1022 hosts
  2. B64 subnets and 1024 hosts
  3. C62 subnets and 254 hosts
  4. D64 subnets and 256 hosts
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Correct answer: (A) 62 subnets and 1022 hosts

Explanation

Class B has 16 host bits. Using 6 bits for the subnet leaves 10 host bits. Number of subnets = 2⁶ − 2 = 62; hosts per subnet = 2¹⁰ − 2 = 1022.

Q57UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
Which of the following statements are true? (A) The fragmentation field in the base header section of IPv4 have moved to the fragmentation extension header in IPv6 (B) The authentication extension header is new in IPv6 (C) The record route option is not implemented in IPv6 Code :
  1. A(A) and (B) only
  2. B(B) and (C) only
  3. C(A) and (C) only
  4. D(A), (B) and (C)
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Correct answer: (D) (A), (B) and (C)

Explanation

In IPv6 the fragmentation fields of the IPv4 base header have moved to the fragmentation extension header, the authentication extension header is new in IPv6, and the record route option is not implemented in IPv6. So all the given statements are correct.

Q58UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
A signal processor software is expected to operate for 91.25 days after repair, and the mean software repair time is expected to be 5 minutes. Then, the availability of the software is :
  1. A96.9862%
  2. B97.9862%
  3. C98.9962%
  4. D99.9962%
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Correct answer: (D) 99.9962%

Explanation

Availability = MTBF / (MTBF + MTTR). MTBF = 91.25 × 24 × 60 = 131,400 minutes and MTTR = 5 minutes, so availability = 131,400 / 131,405 = 99.9962%.

How to use these UGC NET Computer Science questions

Every question here was asked in a real UGC NET paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full UGC NET papers as timed tests to check your speed under exam conditions.