GATE CSE
Computer Networks
TCP UDP Sockets and Congestion Control
Previous Years Questions

## Marks 1

Consider a 100 Mbps link between an earth station (sender) and a satellite (receiver) at an altitude of 2100 km. The signal propagates at a speed of 3...
Consider the data transfer using TCP over a 1 Gbps link. Assuming that the maximum segment lifetime (MSL) is set to 60 seconds, the minimum number of ...
Which of the following protocol pairs can be used to send and retrieve e-mails (in that order)?
Consider a long-lived $$TCP$$ session with an end-to-end bandwidth of $$1$$ $$Gbps$$ ($$= {10^9}\,$$ bits-persecond). The session starts with a seque...
Consider the following statements. I. TCP connections are full duplex II. TCP has no option for selective acknowledgment III. TCP connections are m...
Identify the correct order in which a server process must invoke the function calls accept, bind, listen, and recv according to UNIX socket APL
Suppose two hosts use a TCP connection to transfer a large file. Which of the following statements is/are FALSE with respect to the TCP connection? I...
Which one of the following socket API functions converts an unconnected active TCP socket into a passive socket?
The transport layer protocols used for real time multimedia, file transfer, DNS and email, respectively are
Which of the following transport layer protocols is used to support electronic mail?
What is the maximum size of data that the application layer can pass on to the TCP layer below?
Which of the following system calls results in the sending of SYN packets?
Packets of the same session may be routed through different paths in
Which of the following functionalities must be implemented by a transport protocol over and above the network protocol?

## Marks 2

Consider two hosts P and Q connected through a router R. The maximum transfer unit (MTU) value of the link between P and R is 1500 bytes, and between ...
Consider the sliding window flow-control protocol operating between a sender and a receiver over a full-duplex error-free link. Assume the following: ...
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...
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 adver...
Match the following .tg {border-collapse:collapse;border-spacing:0;border-color:#999;} .tg td{font-family:Arial, sans-serif;font-size:14px;padding:...
Consider the following statements regarding the slow start phase of the $$TCP$$ congestion control algorithm. Note that $$cwnd$$ stands for the $$TCP... Consider an$$IP$$packet with a length of$$4,500$$bytes that includes a$$20$$-byte$$IPv4$$header and a$$40$$-byte$$TCP$$header. The packe... For a host machine that uses the token bucket algorithm for congestion control, the token bucket has a capacity of 1 megabyte and the maximum output r... Assume that the bandwidth for a TCP connection is 1048560 bits/sec. Let$$\alpha  be the value of RTT in milliseconds(rounded off to the nearest int...
Let the size of congestion window of a TCP connection be 32 KB when a timeout occurs. The round trip time of the connection is 100 msec and the maximu...
Consider an instance of TCP’s Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of the slow start phase is...
While opening a TCP connection, the initial sequence number is to be derived using a time-of-day (ToD) clock that keeps running even when the host is ...
A client process P needs to make a TCP connection to a server process S. Consider the following situation: the server process S executes a socket( ), ...
In the slow start phase of the TCP congestion control algorithm, the size of the congestion window
A computer on a 10 Mbps network is regulated by a token bucket. The token bucket is filled at a rate of 2 Mbps. It is initially filled to capacity wit...
Consider three IP networks A, B and C. Host HA in networks A sends messages each containing 180 bytes of application data to a host HC in network C. T...
Consider three IP networks A, B and C. Host HA in networks A sends messages each containing 180 bytes of application data to a host HC in network C. T...
A TCP message consisting of 2100 bytes is passed to IP for delivery across two networks. The first network can carry a maximum payload of 1200 bytes p...
Suppose that the maximum transmit window size for a TCP connection is 12000 bytes. Each packet consists of 2000 bytes. At some point of time, the conn...
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