1. Provided the network schematics as shown below. A special scenario where two
ID: 3679260 • Letter: 1
Question
1. Provided the network schematics as shown below. A special scenario where two hosts H H2 send TCP and UDP traffic to the same host H3 respectively both at 100MBits/s. All of the links are 100MBits/s FULL DUPLEX The Wireshark Capture on the link connected to Host 3(172.16.3.22/25) which is shared by both the TCP and UDP traffic is as shown below. 152 362435037 [PSH, ACK] Seq-1 Ack-1 win-14608 Len-86 TSval-4319063 TSecr 4255993 81 362435037 [PSH, ACK] Seq-87 Ack-1l win-14608 Len-15 TSval 4319063 Tsecr-4255993 66 503736243 [ACK] seq-1 Ack-87 win-14480 Len-0 Tsva1-4255993 TSecr-4319063 66 503736243 [ACK] Seq-1 Ack-102 win-14480 Len-0 TSval-4255993 TSecr-4319063 66 503734134 [ACK] Seq-1 Ack-84 win-14480 Len-0 TSval-4301309 TSecr-4319063 66 503734134 [ACK] Seq-1 Ack-99 win-14480 Len-0 TSval-4301309 TSecr 4319063 60056 > 5038 [SYN] seq-0 win»14600 Len-o MSS-1460 SACKBERM-1 TSva1-4301309 TSecr+0 WS-16 74 5038 60056 [SYN, ACK] Seq-0 Ack-1 win-14480 Len-0 MSS-1460 SACK PERM-1 Tsval 4319064 Tsecr-430130 31 4. 810877 33 4.811114 35 4. 811127 172.16.3.22 172.16.3.22 172.16. 3.22 60 Source port: 58133 Destination port: 5039 1042 source port: 58133 Destination port: 5039 1042 source port: 58133 Destination port: 5039 1042 Source port: 58133 Destination port: 5039 1042 Source port: 58133 Destination port: 5039 1042 source port: 58133 Destination port: 5039 1042 source port: 58133 Destination port: 5039 36 4.811363 38 4.811373 40 4.811607 42 4.811636 44 4. 811873 46 4.811897 172.16. 3.22 172.16.3.6 172.16.3.6 172.16.3.5 172.16.3.22 172.16. 3.5 66 600565038 [ACK] Seq-1 Ack-1 win-14608 Len-0 TSval-4301309 TSecr-4319064 66 5038 60056 [ACK] Seq-1 Ack-1001 Win-16480 Len-0 TSval-4319064 TSecr-4 301309 43 4.811865 172.16.3.22 172.16.3.5 1042 Source port: 58133 Destination port: 5039 66 5038> 60056 [ACK] Seq-1 Ack-2449 win-19376 Len-0 Tsval-4319064 TSecr 4301309 0Explanation / Answer
Time
A
R1
R1
R2
R3
R4
B
T
SENDS
QUEUES
SENDS
SENDS
SENDS
SENDS
ACKs
0
1,2,3
2,3
1
1
1
1
2
1
3
2
2
2
2
0
2
3
3
3
3
1
3
4
4
4
4
4
2
4
5
5
5
5
5
0
5
6
6
6
6
6
1
6
7
7
7
7
7
2
TO MINIMIZE INITIAL PILE_UP WE USE WINSIZE=1 THEN THERE IS NO NEED QUEUE PACKETS AT R1.
Time
A
R1
R1
R2
R3
R4
B
T
SENDS
QUEUES
SENDS
SENDS
SENDS
SENDS
ACKs
0
1,2,3
2,3
1
1
1
1
2
1
3
2
2
2
2
0
2
3
3
3
3
1
3
4
4
4
4
4
2
4
5
5
5
5
5
0
5
6
6
6
6
6
1
6
7
7
7
7
7
2
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