Week 6 Summary

Question 1

UDP Header Fields:
Length
Source Port
Destination port
Checksum

Answer 1

True

Question 2

TCP Header fields:
Source Port
Header Length/Data Offset
Window Size
Sequence Number
Destination Port
Checksum

Answer 2

True

Question 3

TCP Connection Initialization: 3 steps:

Answer 3

1. Client sends segment with SYN set to 1
2. Server sends segment with SYN set to 1 and ACK set to Client’s SeqNum+1
3. Client sends segment with SYN set to 0 and ACK set to the Server’s SeqNum+1.

Question 4

Closing TCP Connection: 4 steps

Answer 4

1. Client sends segment with FIN bit set.
2. Server sends ACK of received segment.
3. Server sends segment with FIN bit set.
4. Client sends ACK of received segment.

Question 5

UDP uses an additive-increase multiplicative-decrease (AIMD) system to manage flows.

Answer 5

False.

Question 6

The rate of CongWin size increase (in terms of MSS) while in TCP’s Congestion Avoidance phase is _______ .

Answer 6

Linear

Question 7

TCP implements network fairness directly.

Answer 7

False. It does it indirectly.

Question 8

What do the following cause: 
Parallel TCP Connections
Typical Internet Usage
High Utilization
Dropped TCP Packets
Reliable Data Transfer Schemes

Answer 8

Network congestion

Question 9

UDP implements network fairness.

Answer 9

False.

Question 10

Possible consequences of network-core congestion:

Answer 10

Network collapse
Delayed packets
Out-of-order packet arrival
Dropped packets
Increased network congestion.

Question 11

Flow control is intended primarily to

Answer 11

keep a TCP sender from overwhelming receiver’s buffer.

Question 12

TCP sequence numbers used to implement

Answer 12

in-order delivery

Question 13

The rate of CongWin size increase (in terms of MSS) while in TCP’s Slow-Start phase is

Answer 13

exponential