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Question 2 NAT · 2.0 marks
Assume a host in Mumbai wants to send a packet to a server in Delhi, approximately 1510 km
away. If the signal travels at 2 × 10\(^{6}\) m/s, what is the one-way propagation delay in milliseconds?
NOTE: Assume no processing or queuing delay(in ms).
A published solution is not available for this question yet.
A transmitter sends packets of size 2000 bits at a rate of 3 Mbps from node X to node Y. The one-
way delay is observed to vary between 20 ms (no queueing) and 120 ms (maximum queue), with
an average of 60 ms. Assume queuing occurs only at one router along the path and there is no
packet loss. What is the mean number of packets in the queue at the bottleneck link?
A published solution is not available for this question yet.
In a circuit-switched network, a source communicates with a destination through 5 intermediate
switches. Each switch takes 3 ms to process a reservation request before forwarding it to the next
node. The propagation delay between each pair of nodes (i.e., source/switch/destination) is 2 ms.
What is the total time (in milliseconds) taken for the reservation request to reach the destination?
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A TCP connection uses the following identifiers:
• Source IP = 192.168.1.10
• Destination IP = 10.0.0.5
• Source Port = 55000
• Destination Port = 80
Assuming that TCP port numbers range from 0 to 65535, but 0–1023 are the well-known
(privileged) ports and are excluded, how many additional TCP connections can this host
theoretically open to the same server (IP 10.0.0.5, port 80) using different source ports?
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A 20 Mbps link has a propagation delay of 400 μs. The transmitter employs the Stop-and-Wait
protocol. Assuming each frame is 100 bytes long, what is the maximum data rate possible?
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If you are designing sliding window protocol (assume selective repeat) of 7 Mbps which has one
way delay of 1.55 seconds. Assuming each frame carries 1kB of data, what is the minimum
number of bits you need for the sequence number?
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In a network with a bottleneck bandwidth of 25 Mbps and a round-trip time of 400 ms,what should
be the minimum congestion window size (in bytes) to fully utilize the link?
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In TCP BBR’s bottleneck bandwidth estimation, the ACK arrival rate measured over an epoch gives
a delivery rate of 48 Mbps. If the minimum measured RTT (RTTmin) is 100 ms, what is BBR’s
current estimate of the bottleneck bandwidth (in Mbps)?
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A TCP Reno connection detects congestion when CWND = 100 KB. After triple duplicate ACK,
CWND is reduced to 3/4, and additive increase resumes with +1 KB per RTT. Compute the CWND
after 3 RTTs post-loss.(in KB)
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An ISP manages a network block of 200.8.0.0/10. it partitions and assigns a customer a smaller
block 200.8.4.128/22. Calculate the number of network bits that were added to the prefix length
during this delegation process and then find how many total subnets could the ISP theoretically
create from the original /10 block if it subdivides it all the way down to /22 subnets?
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An organization has 2,200 devices connected in a private network. Each NAT router can handle up
to 80,000 simultaneous connections and can serve 290 devices comfortably. If they use NAT (one
public IP per NAT router), how many public IP addresses are required?
A published solution is not available for this question yet.
