UGC NET Computer Science Computer Networks Previous Year Question Paper and Solution with PDF

UGC NET Computer Science Previous Year Questions (PYQs)

UGC NET Computer Science Computer Networks PYQ

Qus : 1 UGC NET Computer Science PYQ

Match List I with List II

List I	List II
A. Count to infinity problem	I. Mobile Adhoc Networks
B. IEEE 802.16	II. Distance vector routing
C. IEEE 802.15	III. WiMAX
D. AODV protocol	IV. Bluetooth

Choose the correct answer from the options given below:

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

Count to infinity → Distance vector routing

IEEE 802.16 → WiMAX

IEEE 802.15 → Bluetooth

AODV → Mobile Adhoc Networks

Qus : 2 UGC NET Computer Science PYQ

Match List I with List II

List I	List II
A. Digital Signature	I. Asymmetric encryption algorithm.
B. Hash Function	II. Confirms authenticity and integrity.
C. AES	III. Produces a fixed-size digest.
D. RSA	IV. Symmetric encryption algorithm.

Choose the correct answer from the options given below:

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

Digital Signature → Confirms authenticity and integrity
Hash Function → Produces a fixed-size digest
AES → Symmetric encryption algorithm
RSA → Asymmetric encryption algorithm

Qus : 3 UGC NET Computer Science PYQ

The packet sent by a node to the source to inform it of congestion is called:

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

In computer networks, when congestion occurs in a network, the router sends a special control packet called a choke packet to the source. This packet informs the source node to slow down the transmission rate to prevent further congestion. This method is part of congestion control mechanisms such as the Choke Packet Technique used in the Internet Control Message Protocol (ICMP).

Qus : 4 UGC NET Computer Science PYQ

Which of the following are examples of data encoding schemes?

A. Non-Return to Zero (NRZ)

B. Manchester Encoding

C. Amplitude Modulation

D. Hamming code

E. Bipolar AMI

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

NRZ, Manchester, and Bipolar AMI are line/data encoding schemes used on digital links.

Amplitude Modulation is a carrier modulation scheme (analog).

Hamming code is an error-detecting/correcting code, not a line encoding scheme.

Qus : 5 UGC NET Computer Science PYQ

Arrange the steps involved when a user enters a URL in a browser and accesses a website.

A. DNS resolution

B. HTTP request sent

C. URL entered in the browser

D. IP address obtained

E. Webpage displayed

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

Correct sequence:

C → A → D → B → E

User enters the URL (C).

DNS resolution happens (A).

Browser obtains the IP address (D).

HTTP request is sent (B).

The webpage is displayed (E).

Qus : 6 UGC NET Computer Science PYQ

Which of the following is not the characteristic of packet switching?

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

Packet switching does not require a dedicated path; each packet can take different routes based on availability.

It supports dynamic routing and data is broken into packets for efficient transmission.

Hence, “Requires a dedicated path” is not a characteristic of packet switching.

Qus : 7 UGC NET Computer Science PYQ

In a Stop-and-Wait system, the bandwidth of the line is 1 Mbps, and 1 bit takes 30 milliseconds to make a round trip. The bandwidth-delay product is:

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

Bandwidth-delay product = Bandwidth × Round-trip time = $1 \times 10^6 \times 30 \times 10^{-3}$ = 30,000 bits.

Qus : 8 UGC NET Computer Science PYQ

CB84000D001C001C is the content of a UDP header in hexadecimal format. The source port number is:

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

First 16 bits = Source port = CB84 Convert CB84 to decimal → = (12 × 4096) + (11 × 256) + (8 × 16) + 4 = 49152 + 2816 + 128 + 4 = 52000.

Qus : 9 UGC NET Computer Science PYQ

Which of the following statements are TRUE about encryption techniques?

A. In symmetric key cryptography, the secrecy/protection of the key generating function must be of higher level than the decrypting function.

B. The DES technique works by taking 64-bit chunk value and 56-bit key over a series of transformations.

C. The Twofish symmetric block algorithm works on variable key length of up to 196 bits over a block of 128 bits.

D. RC₄ is the most commonly used stream cipher that encrypts and decrypts a stream of bits/bytes instead of blocks.

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

(A) ❌ Incorrect — in symmetric encryption, both encryption and decryption use the same key; no function is “more protected.”

(B) ✅ DES uses 64-bit block size and 56-bit effective key (8 bits reserved for parity).

(C) ✅ Twofish supports key lengths up to 256 bits, and block size is 128 bits, but the statement “up to 196 bits” is acceptable as partial truth (still correct conceptually).

(D) ✅ RC₄ is a well-known stream cipher, processing data as a stream of bits/bytes rather than blocks.

Qus : 10 UGC NET Computer Science PYQ

Which of the following are controlled-access protocols? A. Reservation
B. Polling
C. TDMA
D. Token Passing
E. CSMA/CA Choose the correct answer from the options given below:

1
2
3
4
Go to Discussion

UGC NET Computer Science UGC NET PYQ UGC NET Computer Science UGC NET Computer Science 26 June 2025 (Paper II) PYQ

Solution

Protocol	Type	Explanation
A. Reservation	Controlled Access	Stations reserve the channel for transmission before sending data.
B. Polling	Controlled Access	A central controller polls each station to determine if it has data to send.
C. TDMA (Time Division Multiple Access)	Channelization	Divides the channel into time slots — not part of controlled access.
D. Token Passing	Controlled Access	A special token is passed between stations; only the holder can transmit.
E. CSMA/CA	Random Access	Uses collision avoidance — it’s a contention-based protocol, not controlled access.

Feedback

Info.

Information

Aspire's Library

UGC NET Computer Science Previous Year Questions (PYQs)

UGC NET Computer Science Computer Networks PYQ

Solution

Solution

Solution

Solution

Solution

Solution

Solution

Solution

Solution

Solution

UGC NET Computer Science

UGC NET Computer Science

Info.

Confirm Delete

Edit