1
GATE CSE 2021 Set 1
MCQ (More than One Correct Answer)
+2
-0.67

A TCP server application is programmed to listen on port number P on host S. A TCP client connected to the TCP server over the network.

Consider that while the TCP connection was active, the server machine S crashed are rebooted. Assume that the client does not use the TCP keepalive timer.

Which of the following behaviours is/are possible?

A
If the client sends a packet after the server reboot, it will receive a RST segment.
B
If the client was waiting to receive a packet, it may wait indefinitely.
C
It the client sends a packet after the server reboot, it will receive a FIN segment.
D
The TCP server application on S can listen on P after reboot.
2
GATE CSE 2020
Numerical
+2
-0.67
Consider a TCP connection between a client and a server with the following specifications: the round trip time is 6 ms, the size of the receiver advertised window is 50 KB, slow start threshold at the client is 32 KB, and the maximum segment size is 2 KB. The connection is established at time t = 0. Assume that there are no timeouts and errors during transmission.
Then the size of the congestion window (in KB) at time t + 60 ms after all acknowledgements are processed is ______.
Your input ____
3
GATE CSE 2018
MCQ (Single Correct Answer)
+2
-0.6
Match the following

Field Length in bits
P. UDP Header’s Port Number I. 48
Q. Ethernet MAC Address II. 8
R. IPv6 Next Header III. 32
S. TCP Header’s Sequence Number IV. 16

A
$$P - {\rm I}{\rm I}{\rm I},\,\,Q - {\rm I}V,\,\,R - {\rm I}{\rm I},S - {\rm I}$$
B
$$P - {\rm I}{\rm I},\,\,Q - {\rm I},\,\,R - {\rm I}V,S - {\rm I}{\rm I}{\rm I}$$
C
$$P - {\rm I}V,\,\,Q - {\rm I},\,\,R - {\rm I}{\rm I},S - {\rm I}{\rm I}{\rm I}$$
D
$$P - {\rm I}V,\,\,Q - {\rm I},\,\,R - {\rm I}{\rm I}{\rm I},S - {\rm I}{\rm I}$$
4
GATE CSE 2018
MCQ (Single Correct Answer)
+2
-0.6
Consider the following statements regarding the slow start phase of the $$TCP$$ congestion control algorithm. Note that $$cwnd$$ stands for the $$TCP$$ congestion window and $$MSS$$ denotes the Maximum Segment Size.

$$(i)$$ $$\,\,\,\,\,\,\,\,\,\,\,$$ The $$cwnd$$ increases by $$2$$ $$MSS$$ on every successful acknowledgment.
$$(ii)$$ $$\,\,\,\,\,\,\,\,\,$$ The $$cwnd$$ approximately doubles on every successful acknowledgement.
$$(iii)$$ $$\,\,\,\,\,\,\,$$ The $$cwnd$$ increases by $$1$$ $$MSS$$ every round trip time.
$$(iv)$$ $$\,\,\,\,\,\,\,\,\,$$ The $$cwnd$$ approximately doubles every round trip time.

Which one of the following is correct?

A
Only $$(ii)$$ and $$(iii)$$ are true
B
Only $$(i)$$ and $$(iii)$$ are true
C
Only $$(iv)$$ is true
D
Only $$(i)$$ and $$(iv)$$ are true
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