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cs4024_2026T1_Q1_NA.pdf

Computer Networks · Quiz 1 · Jan 2026

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Questions and published explanations below are available without starting a test. Some questions may not have a published solution yet.

Question 2 MCQ · 1.0 marks

In computer networks, a **client-server model** allows multiple clients to request services from a single server.
  1. True
  2. False

A published solution is not available for this question yet.

Question 3 MCQ · 1.0 marks

An **IP address** is used to identify a device’s location in the network rather than its hardware.
  1. True
  2. False

A published solution is not available for this question yet.

Question 4 MCQ · 1.0 marks

In circuit-switched networks, resources are reserved for the entire duration of the communication session.
  1. True
  2. False

A published solution is not available for this question yet.

Question 5 MCQ · 1.0 marks

UDP provides reliable, in-order delivery of packets similar to TCP.
  1. True
  2. False

A published solution is not available for this question yet.

Question 6 MCQ · 1.0 marks

If **packet #6** is lost in **Selective Repeat ARQ** with a window size of **4**, only **4 packets** must be retransmitted.
  1. True
  2. False

A published solution is not available for this question yet.

Question 7 MCQ · 3.0 marks

A switch needs to transmit a packet of size 10,000 bits over a link with a transmission rate of 100 Mbps. What is the transmission delay?
  1. [[IMAGE:bd3b5a85a43d11b7_4_2]]
    Source diagram or notation
  2. [[IMAGE:bd3b5a85a43d11b7_4_3]]
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  3. [[IMAGE:bd3b5a85a43d11b7_4_4]]
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  4. [[IMAGE:bd3b5a85a43d11b7_4_5]]
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A published solution is not available for this question yet.

Question 8 MCQ · 5.0 marks

A communication link has a bandwidth of [[IMAGE:bd3b5a85a43d11b7_5_6]] and a round-trip time (RTT) of [[IMAGE:bd3b5a85a43d11b7_5_7]] . The sender uses a **sliding window protocol** with a window size of [[IMAGE:bd3b5a85a43d11b7_5_8]] packets. Each packet is of size [[IMAGE:bd3b5a85a43d11b7_5_9]] . What is the **maximum achievable throughput** of the link?
Source diagram or notationSource diagram or notationSource diagram or notationSource diagram or notation
  1. [[IMAGE:bd3b5a85a43d11b7_5_10]]
    Source diagram or notation
  2. [[IMAGE:bd3b5a85a43d11b7_5_11]]
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  3. [[IMAGE:bd3b5a85a43d11b7_5_12]]
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  4. [[IMAGE:bd3b5a85a43d11b7_5_13]]
    Source diagram or notation

A published solution is not available for this question yet.

Question 9 MSQ · 3.0 marks

Consider the undirected network graph shown below: [[IMAGE:bd3b5a85a43d11b7_5_14]] Which of the following is/are a **critical nodes**?
Source diagram or notation
  1. P
  2. Q
  3. R
  4. T

A published solution is not available for this question yet.

Question 10 NAT · 3.0 marks

A download completes in 2 seconds with an average throughput of 180 KB/s using curl. Calculate the size of the downloaded file (in KB).

    A published solution is not available for this question yet.

    Question 11 NAT · 3.0 marks

    Assume a host in Chennai wants to send a packet to a server in Hyderabad, approximately 650 km away. If the signal travels at [[IMAGE:bd3b5a85a43d11b7_6_15]] , calculate the one-way propagation delay in milliseconds.
    Source diagram or notation

      A published solution is not available for this question yet.

      Question 12 NAT · 3.0 marks

      The propagation delay of a signal in a fiber-optic link is measured as [[IMAGE:bd3b5a85a43d11b7_6_16]] . If the signal propagation speed in the fiber is [[IMAGE:bd3b5a85a43d11b7_6_17]] , what is the length of the fiber link (in km)?
      Source diagram or notationSource diagram or notation

        A published solution is not available for this question yet.

        Question 13 NAT · 3.0 marks

        A web server has, on average, [[IMAGE:bd3b5a85a43d11b7_7_18]] requests present in the system. The server receives [[IMAGE:bd3b5a85a43d11b7_7_19]] requests per second. What is the average time (in seconds) a request spends in the system?
        Source diagram or notationSource diagram or notation

          A published solution is not available for this question yet.

          Question 14 NAT · 3.0 marks

          In a **Selective Repeat ARQ** protocol, the sender uses a window size of **10**. What is the **minimum** **number of bits** required for the sequence number field?

            A published solution is not available for this question yet.

            Question 15 NAT · 3.0 marks

            In the **Go-Back-N ARQ** protocol, the sender uses a window size of [[IMAGE:bd3b5a85a43d11b7_7_20]] and transmits packets #21, #22, #23, #24, and #25. Assume that packets #21 to #24 are received correctly and acknowledged, but packet #25 is lost. When the timeout occurs for packet #25, how many packets will the sender retransmit?
            Source diagram or notation

              A published solution is not available for this question yet.

              Question 16 NAT · 3.0 marks

              A [[IMAGE:bd3b5a85a43d11b7_8_21]] Mbps communication link has a one-way propagation delay of [[IMAGE:bd3b5a85a43d11b7_8_22]] . The transmitter uses the **Stop-and-Wait** protocol. Each data frame is [[IMAGE:bd3b5a85a43d11b7_8_23]] bytes long. Assuming that acknowledgment frames are negligible in size, what is the **maximum achievable** **data rate**? Note: Write your answer in Mbps correct to two decimal places.
              Source diagram or notationSource diagram or notationSource diagram or notation

                A published solution is not available for this question yet.

                Question 17 SHORT_TEXT · 5.0 marks

                Consider the following 16-bit words (in hexadecimal) that are used to compute a UDP checksum: [[IMAGE:bd3b5a85a43d11b7_8_24]] After performing the UDP checksum steps (one’s-complement addition of all words, folding any overflow, and taking the one’s complement), what will be the final checksum value?
                Source diagram or notation

                  A published solution is not available for this question yet.

                  Question 18 NAT · 4.0 marks

                  A communication channel has a bandwidth-delay product (BDP) of [[IMAGE:bd3b5a85a43d11b7_9_25]] . If each packet transmitted over the channel has a size of [[IMAGE:bd3b5a85a43d11b7_9_26]] , what is the **minimum window size (in packets)** required to fully utilize the link?
                  Source diagram or notationSource diagram or notation

                    A published solution is not available for this question yet.

                    Question 19 NAT · 4.0 marks

                    You are designing a **Selective Repeat sliding window protocol** over a link with a data rate of [[IMAGE:bd3b5a85a43d11b7_9_27]] Mbps and a one-way propagation delay of [[IMAGE:bd3b5a85a43d11b7_9_28]] seconds. Each data frame carries [[IMAGE:bd3b5a85a43d11b7_9_29]] kB of payload. What is the **minimum number of bits required for the sequence number**?
                    Source diagram or notationSource diagram or notationSource diagram or notation

                      A published solution is not available for this question yet.