WB JECA MCA Computer Networks Previous Year Question Paper and Solution with PDF

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WB JECA MCA Previous Year Questions (PYQs)

WB JECA MCA Computer Networks PYQ

Qus : 1 WB JECA MCA PYQ

In User Datagram packet format, the size of the header is ________.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

The UDP header is 8 bytes (64 bits) long — containing source port, destination port, length, and checksum.

Qus : 2 WB JECA MCA PYQ

Transmission Control Protocol (TCP) offers __________ service in which data can flow in both directions at the same time.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

TCP provides a full-duplex service — meaning data can flow simultaneously in both directions.

Qus : 3 WB JECA MCA PYQ

Example of a two-layer switch is ____________.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

A bridge operates at Layer 2 (Data Link Layer) and is considered a two-layer switch.

Qus : 4 WB JECA MCA PYQ

A ____________ routing table contains information entered manually.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

A static routing table is manually configured by the administrator.

Qus : 5 WB JECA MCA PYQ

BOOTP is ____________ layer protocol.
(A) application
(B) physical
(C) network
(D) datalink

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

BOOTP (Bootstrap Protocol) works at the application layer of the OSI model.

Qus : 6 WB JECA MCA PYQ

ICMP always reports error messages to the original ____________.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

ICMP error messages are always sent back to the source of the packet.

Qus : 7 WB JECA MCA PYQ

The ____________ program uses ICMP messages and TTL field in IP packet to find route.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

traceroute uses ICMP Echo and TTL fields to determine the route to a destination.

Qus : 8 WB JECA MCA PYQ

SNMP is ____________ level protocol.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

SNMP (Simple Network Management Protocol) is an application layer protocol.

Qus : 9 WB JECA MCA PYQ

Packet switching means:

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Data is divided into packets and transmitted independently.

Qus : 10 WB JECA MCA PYQ

In the OSI model, which layer is responsible for detecting errors caused during physical transmission?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Data link layer handles error detection.

Qus : 11 WB JECA MCA PYQ

In the TCP/IP model, ______ is responsible for determining the best path for data packets to travel across interconnected networks.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Internet layer handles routing.

Qus : 12 WB JECA MCA PYQ

Which type of routing automatically changes its path selection based on current network conditions like congestion or link failures?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Adaptive routing adjusts based on network conditions.

Qus : 13 WB JECA MCA PYQ

Which of the following protocols is connectionless and provides unreliable data delivery?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

IP and UDP are connectionless and unreliable.

Qus : 14 WB JECA MCA PYQ

Which field in the IPv4 header helps uniquely identify fragments of a datagram so they can be reassembled correctly?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Identification field helps in fragment reassembly.

Qus : 15 WB JECA MCA PYQ

The IP address 10.5.6.7 belongs to which class?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Class A range: 1–126.

Qus : 16 WB JECA MCA PYQ

Which application layer protocol is primarily used for sending email?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

SMTP is used for sending emails.

Qus : 17 WB JECA MCA PYQ

What does a firewall primarily do?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Firewall filters incoming/outgoing traffic.

Qus : 18 WB JECA MCA PYQ

Which attack involves intercepting and altering communication between two parties without their knowledge?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

MITM attack intercepts communication.

Qus : 19 WB JECA MCA PYQ

Which device is used to connect multiple devices within the same network segment and operates at the data link layer?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Switch works at data link layer.

Qus : 20 WB JECA MCA PYQ

The number of cross point needed for 10 lines cross point switch in full duplex in nature and there are no self connection is

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Crosspoints = n(n−1)/2 = 45.

Qus : 21 WB JECA MCA PYQ

Maximum data rate of a channel for noiseless 3 KHz binary channel is

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Nyquist: 2B log2M = 2×3000×1 = 6000 bps.

Qus : 22 WB JECA MCA PYQ

The store and forward mechanism is used in

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

In message switching, the entire message is stored at intermediate nodes and then forwarded → store and forward.
Answer = (B) Message Switching

Qus : 23 WB JECA MCA PYQ

The _____ is an asymmetric key cryptographic algorithm.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution:
- RSA is an asymmetric key cryptographic algorithm.
- Others are not asymmetric cryptography.
Answer = (A) RSA

Qus : 24 WB JECA MCA PYQ

Baud means

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: Baud = number of signal changes per second, not bits/bytes directly.
Answer: (C)

Qus : 25 WB JECA MCA PYQ

Which layer of the OSI model is responsible for routing and forwarding packets ?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: Routing and forwarding are functions of the Network Layer (Layer 3).
Answer: (A)

Qus : 26 WB JECA MCA PYQ

Which one of the following does not have a Net ID and Host ID ?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: Class D addresses (224.0.0.0–239.255.255.255) are multicast, not divided into NetID/HostID.
Answer: (D)

Qus : 27 WB JECA MCA PYQ

In the OSI model, encryption and decryption are functions of the ____.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: The Presentation Layer handles encryption/decryption and data translation.
Answer: (C)

Qus : 28 WB JECA MCA PYQ

A Port address in TCP/IP is ____ bits long.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: TCP/UDP port numbers are 16-bit integers.
Answer: (C) 16

Qus : 29 WB JECA MCA PYQ

In IPv4 network ID and host ID in Class A is:

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: Class A: 1 byte netID, 3 bytes hostID ⇒ 8+24 bits.
Answer: (A)

Qus : 30 WB JECA MCA PYQ

____ server is used to create a secure tunnel connection.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: Secure tunnel is provided by a VPN server.
Answer: (B)

Qus : 31 WB JECA MCA PYQ

Hamming code is used for ____.

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: Hamming code detects and corrects single-bit errors ⇒ both detection & correction.
Answer: (D)

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