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

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 : 10 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 : 11 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 : 12 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 : 13 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 : 14 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 : 15 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 : 16 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 : 17 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 : 18 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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