22 Computer Networks (Computer Science) questions asked in CIL MT previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
Which of the following statements best reflects a comprehensive layered design issue in computer networks?
AEach layer must handle key issues like addressing, error control, flow control, sequencing and data direction, ensuring reliable communication between entities without breaking layer abstraction.
BThe design issues of addressing and error control are handled exclusively by the network layer, while flow control and sequencing are managed solely by the transport layer.
CLayered design primarily concerns selecting the physical transmission medium and ensuring minimal propagation delay across all layers.
DOnce error control and sequencing are implemented at the data link layer, upper layers are exempt from such design considerations.
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Correct answer: (A) Each layer must handle key issues like addressing, error control, flow control, sequencing and data direction, ensuring reliable communication between entities without breaking layer abstraction.
Which of the following statements best distinguishes the relationship between a service and a protocol in a layered network architecture?
ABoth services and protocols define the message formats and meanings used between the same layer entities, but at different abstraction levels.
BA service specifies what operations a layer offers to the layer above, whereas a protocol defines how peer entities within the same layer communicate to provide that service.
CA service is the physical implementation of a protocol; thus, changing the protocol automatically changes the provided service.
DA protocol defines the interface between two adjacent layers, while a service specifies the message exchange rules between peer entities.
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Correct answer: (B) A service specifies what operations a layer offers to the layer above, whereas a protocol defines how peer entities within the same layer communicate to provide that service.
A team develops a text-mining tool that highlights sequences in security logs where a server's alert code is immediately followed by an IP address in the format
10.0.X.Y (where X and Y are integers). Which regular expression most efficiently
identifies these patterns without false positives?
Two concurrent processes P and Q execute the following code.
Process P:
while(True){
W: ____
print('0'); print('0');
X: ____
}
Process Q:
while(True){
Y: ____
print('1'); print('1');
Z: ____
}
Given S and T are binary semaphore variables, and P() and V() as standard "wait" and "signal" functions respectively. What should be the semaphore operations W, X, Y, and Z for the output string: 11001100…?
Which of the following protocols is built on client-server architecture and uses separate control and data connections between the client and the server?
Match the following.
List I: I) Attenuation, II) Shannon capacity, III) Nyquist bit rate, IV) Distortion
List II: P) Loss of energy, Q) Changes in shape of the signal, R) Noisy channel, S) Noiseless channel
AI – P, II – Q, III – R, IV – S
BI – P, II – R, III – S, IV – Q
CI – S, II – R, III – Q, IV – P
DI – Q, II – P, III – S, IV – R
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Correct answer: (B) I – P, II – R, III – S, IV – Q
Match the following.
List-1: I) Class-A IP address, II) Class-B IP address, III) Class-C IP address
List-2: A) 8 bit host id and 24 bit network id, B) 16 bit host id and 16 bit network id, C) 24 bit host id and 8 bit network id
Assume that source S and destination D are connected through five intermediate routers R1, R2, R3, R4 and R5. Determine how many times each packet has to visit the Network layer and the Data Link layer during transmission from S to D?
ANetwork Layer: 7 times, Data Link Layer: 12 times
BNetwork Layer: 5 times, Data Link Layer: 12 times
CNetwork Layer: 12 times, Data Link Layer: 12 times
DNetwork Layer: 7 times, Data Link Layer: 7 times
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Correct answer: (A) Network Layer: 7 times, Data Link Layer: 12 times
State TRUE or FALSE for the following.
(i) A sine wave with a phase of 180° starts at time 0 with a zero amplitude. The amplitude is decreasing.
(ii) If a signal changes instantaneously, its frequency is zero.
(iii) In bipolar encoding, we use three voltage levels: positive, negative and zero.
(iv) Infrared signals can be used for short-range communication in a closed area using ground propagation.
Consider the following statement.
I. Packet Filter Firewall analyze network traffic at transport layer.
II. Circuit Level Firewall operate at transport and session layer of OSI Model.
From the above statement which statement/s is/are True
How to use these CIL MT Computer Science questions
Every question here was asked in a real CIL MT 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 CIL MT papers as timed tests to check your speed under exam conditions.