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cs4024_2025T3_Q2_NA.pdf

Computer Networks · Quiz 2 · Sep 2025

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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 24 MCQ · 3.0 marks

[[IMAGE:9d6c49e65f983867_2_1]]
Source diagram or notation
  1. CWND before new ACK = 8 MSS, after new ACK = 8 MSS
  2. CWND before new ACK = 12 MSS, after new ACK = 8 MSS
  3. CWND before new ACK = 12 MSS, after new ACK = 4 MSS
  4. CWND before new ACK = 4 MSS, after new ACK = 12 MSS

A published solution is not available for this question yet.

Question 25 MCQ · 3.0 marks

[[IMAGE:9d6c49e65f983867_3_2]]
Source diagram or notation
  1. Port 1
  2. Port 2
  3. Port 3
  4. Port 4

A published solution is not available for this question yet.

Question 26 NAT · 3.0 marks

A TCP receiver has a buffer size of 30 KB. The sender transmits data at 10 KB/s, while the receiver’s application reads data from the buffer at 6 KB/s. Assuming the buffer is initially empty, after how many seconds will the receiver buffer become full ? Note: Give your answer to two decimal places.

    A published solution is not available for this question yet.

    Question 27 NAT · 3.0 marks

    A TCP connection has an advertised window size of 32 KB and a Round Trip Time (RTT) of 80 ms. Ignoring congestion effects, compute the maximum achievable through-put based solely on flow control. Note: Write the answer in KB/s.

      A published solution is not available for this question yet.

      Question 28 NAT · 3.0 marks

      An organization has been assigned an address block of 10.25.4.0/26. How many usable host addresses can be assigned to devices in this network?

        A published solution is not available for this question yet.

        Question 29 NAT · 3.0 marks

        An organization has 1,800 devices connected in a private network. Each NAT router can handle up to 80,000 simultaneous connections and can serve 300 devices comfortably. If the organization uses NAT (one public IP address per NAT router), how many public IP addresses are required?

          A published solution is not available for this question yet.

          Question 30 NAT · 3.0 marks

          An administrator is given the private IP block 192.168.0.0/16. They need to create subnets that can each support at least 500 hosts. What is the smallest subnet mask prefix they can use, in CIDR notation?

            A published solution is not available for this question yet.

            Question 31 NAT · 4.0 marks

            At the start of an RTT, the congestion window (CWND) is 15 MSS where the Maximum Segment Size (MSS) is 1200 bytes. TCP is operating in the congestion avoidance phase, and there is one ACK per segment. What will be the new value of CWND (in bytes) after receiving 15 ACKs (i.e., one RTT worth of ACKs)?

              A published solution is not available for this question yet.

              Question 32 NAT · 4.0 marks

              A TCP connection has a round-trip time (RTT) of 80 ms and a maximum segment size (MSS) of 1200 bytes. If the steady-state congestion window is 50 MSS, what is the maximum achievable throughput (in Mbps)? Note: Give your answer to two decimal places.

                A published solution is not available for this question yet.

                Question 33 NAT · 4.0 marks

                [[IMAGE:9d6c49e65f983867_6_3]]
                Source diagram or notation

                  A published solution is not available for this question yet.

                  Question 34 NAT · 4.0 marks

                  [[IMAGE:9d6c49e65f983867_6_4]]
                  Source diagram or notation

                    A published solution is not available for this question yet.

                    Question 35 SHORT_TEXT · 4.0 marks

                    Given IP address A = 172.25.50.22 and B = 172.25.63.10 with netmask 255.255.240.0, compute the **network address** of A (iexpressed in dotted-decimal form).

                      A published solution is not available for this question yet.

                      Question 36 NAT · 4.0 marks

                      [[IMAGE:9d6c49e65f983867_7_5]]
                      Source diagram or notation

                        A published solution is not available for this question yet.

                        Question 37 NAT · 5.0 marks

                        [[IMAGE:9d6c49e65f983867_7_6]]
                        Source diagram or notation

                          A published solution is not available for this question yet.