Can you help answer these true/false and possibly provide explanations. Thanks 1

Question

Can you help answer these true/false and possibly provide explanations. Thanks

1. The TCP receiver sends an acknowledgment of sequence number n if it has correctly received byte n: T / F

2. A TCP connection always starts with an initial sequence number equal to zero.

T/F 3. The main motivation of TCP flow control at the sender is to avoid network congestion.

T/F 4. When errors are present, Selective Repeat schemes are more efficient than Go-Back-N schemes.

T/F 5. Congestion control can be implemented on an end-to-end basis or with network assistance.

T/F 6. Host A is sending host B data over a TCP connection, but host B has no data to send to host A. Host B will not send TCP acks to host A because host B has no data to piggyback the acks on.

T/F 7. Network connection setup is a function of some network architectures. T/F

8. TCP is always a Go-Back-N scheme. T/F

9. In packet switched networks, a short delay necessarily means a good throughput. T/F

10. In long fat pipes, a good TCP throughput requires a very low loss rate. T/F

Explanation / Answer

1. true (if the ACK (acknowlegement)flag is set, then the value of this field is the next sequence number that the receiver is expecting. This acknowledges receipt of all prior bytes (if any). The first ACK sent by each end acknowledges the other end's initial sequence number itself, but no data.)

2.false (TCP operates in a very hostile environment and hence, messages an be delayed for a prolonged period of time. and also certain errrors can compromise TCP's ability to provide reliability when a fixed initial state is used at connection establishment.)

3.false (because, the flow control mechanism is mainly used for maintaining and managing the rate of data transmission.)

4.true ( Go-back-N scheme is big enough to hold only 1 frame, while selective repeat has an ability to hold the maximum number od frames a sender can send./the reciever is willing to recieve.)

5.true.

6.false (piggyback is only for efficiency.If there is no packet to be piggybacked, then the packet b will just send acknowlgement to the packet A)

7.true, according to the OSI architecture.

8.false, it also uses, selective repeat and stop and wait arq.

9.according to the study,through put has 5 percentiles.

0% indicates purely bad, 25%,50%,75% (average),100% is purely good.

and hence, it is false.

10.false. (long fat pipes, necessarily, delays the process, and hence, it will have lower than the maximum throughput and hence.

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