WB JECA MCA Computer Networks Previous Year Questions (PYQs) – Page 3 of 4
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Maximum data rate of a channel for noiseless 3 KHz binary channel is
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Solution
Nyquist: 2B log2M = 2×3000×1 = 6000 bps.
The store and forward mechanism is used in
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Solution
In message switching, the entire message is stored at intermediate nodes and then forwarded → store and forward.
Answer = (B) Message Switching
Answer = (B) Message Switching
The _____ is an asymmetric key cryptographic algorithm.
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Solution
Solution:
- RSA is an asymmetric key cryptographic algorithm.
- Others are not asymmetric cryptography.
Answer = (A) RSA
- RSA is an asymmetric key cryptographic algorithm.
- Others are not asymmetric cryptography.
Answer = (A) RSA
Baud means
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Solution
Solution: Baud = number of signal changes per second, not bits/bytes directly.
Answer: (C)
Answer: (C)
Which layer of the OSI model is responsible for routing and forwarding packets ?
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Solution
Solution: Routing and forwarding are functions of the Network Layer (Layer 3).
Answer: (A)
Answer: (A)
Which one of the following does not have a Net ID and Host ID ?
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Solution
Solution: Class D addresses (224.0.0.0–239.255.255.255) are multicast, not divided into NetID/HostID.
Answer: (D)
Answer: (D)
In the OSI model, encryption and decryption are functions of the ____.
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Solution
Solution: The Presentation Layer handles encryption/decryption and data translation.
Answer: (C)
Answer: (C)
A Port address in TCP/IP is ____ bits long.
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Solution
Solution: TCP/UDP port numbers are 16-bit integers.
Answer: (C) 16
Answer: (C) 16
In IPv4 network ID and host ID in Class A is:
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Solution
Solution: Class A: 1 byte netID, 3 bytes hostID ⇒ 8+24 bits.
Answer: (A)
Answer: (A)
____ server is used to create a secure tunnel connection.
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Solution
Solution: Secure tunnel is provided by a VPN server.
Answer: (B)
Answer: (B)
WB JECA MCA
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and More.
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