Computer Networking

Select the correct answer for the following questions:

1) Despite that video and traffic data can tolerate some loss and UDP may be suitable for them, their traffic is often sent over TCP and not UDP in today's internet because most firewalls are configured to block UDP traffic, using TCP for video and voice traffic lets the traffic through the firewalls.

a)True

b)False

2)The size of the TCP rwnd never changes throughout the duration of the connection.

a) True

b) False

3) A process at Host C receiving two incoming UDP segments from two different hosts will know that they originated from two different hosts based on their respective originating IP addresses extracted by the operating system and provided to the process.

a) True

b) False

4) Consider a TCP connection between Host A and Host B. Suppose the TCP segments traveling from Host A to Host B have source port number x and destination port number y. The source and destination port numbers for the segments traveling from Host B to Host A are:

a) Source port number x and destination port number x.

b) Source port number y and destination port number y.

c) Source port number x and destination port number y.

d) Source port number y and destination port number x.

5) Suppose that two TCP connections are present over some bottleneck link of rate R bps. Both connections have a huge file to send in the same direction over the bottleneck link. The transmission of the files starts at the same time. What transmission rate would TCP eventually like to give to each of the connections?

a) 2 R bps

b) R bps

c) R/2 bps

d) R/10 bps

6) Suppose a process in Host C has a UDP socket with port number 6789. Suppose both Host A and Host B each send a UDP segment to Host C with dstination port number6789. Both of these UDP segments from Host A and Host B will be directed to the same socket at Host C.

a) True

b) False

7) the 1's complement of the sum of the following bytes is:

0101 1100

0110 0101

a) 1111 0000

b) 1100 1011

c) 0011 1110

d) 0000 1111

8) It is possible for an application to enjoy reliable data transfer over UDP if the application writes its own reliability protocol within the application layer protocols.

a) True

b) False

9) The sequence numbers were introduced in the development of the rdt protocol for a receiver ?____?.

a) to find out whether an arriving packet contains new data or is a retransmission.

b) to find out if the sender is down

10) Suppose that a Web server runs in Host C on Port 80. Suppose this Web server uses persistent connections and is currently receiving requests from two different Hosts, A and B. The requests from the Hosts A and B are being sent through the same connection socket at Host C.

a) True

b) False