Question 4: Consider the network shown in Figure 1 below, where all the segments (A, B, …., J) are 100Mbps shared Ethernet. Assuming that the network bridges (B1 to B7) have not learnt any addresses yet, the following sequence of events occur at the times indicated, where tim 0 is the time at which the network is ready for forwarding. There is no other traffic on the network. Time 1 sec 5 sec 10 sec 15 sec 20 sec 25 sec Answer the following questions. a) Show the forwarding table of Bridge 1 at time = 14 sec b) Show the forwarding table of Bridge 3 at time = 28 sec c) List the segments on which the transmission at time = 5 sec is seen d) List the segments on which the transmission at time = 20 sec is seen с Note that the loops have to be removed before learning and forwarding happen. Therefore, the tree to be considered is the one obtained after the spanning tree protocol converges (see Module 10 Lesson Plan). E G Event Station A sends a frame to Station B Station C sends a frame to Station B Station B replies to station C Station B replies to station A Station A sends a frame to Station C Station C sends a frame to Station A A B2 B3 Port 2 Port 1 B6 Station C D Station A B1 B5 Table 1 Station B B4 B7 Port 3 Port 2 Port 1 fot F H B K

Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter20: Queuing Theory
Section20.10: Exponential Queues In Series And Open Queuing Networks
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Question 4:
Consider the network shown in Figure 1 below, where all the segments (A, B, ..., J) are 100Mbps shared Ethernet. Assuming that the
network bridges (B1 to B7) have not learnt any addresses yet, the following sequence of events occur at the times indicated, where time =
0 is the time at which the network is ready for forwarding. There is no other traffic on the network.
Time
1 sec
5 sec
10 sec
15 sec
20 sec
25 sec
Answer the following questions.
a) Show the forwarding table of Bridge 1 at time
b) Show the forwarding table of Bridge 3 at time = 28 sec
c) List the segments on which the transmission at time = 5 sec is seen
d) List the segments on which the transmission at time = 20 sec is seen
E
G
Event
Station A sends a frame to Station B
Station C sends a frame to Station B
Station B replies to station C
Station B replies to station A
Station A sends a frame to Station C
Station C sends a frame to Station A
A
Note that the loops have to be removed before learning and forwarding happen.
Therefore, the tree to be considered is the one obtained after the spanning tree protocol
converges (see Module 10 Lesson Plan).
B2
B3
Port 2
Port 1
B6
Station C
Station A
B1
= 14 sec
B5
=
Table 1
Station B
B4
B7
Port 3
Port 2
Port 1
F
H
B
K
Transcribed Image Text:Question 4: Consider the network shown in Figure 1 below, where all the segments (A, B, ..., J) are 100Mbps shared Ethernet. Assuming that the network bridges (B1 to B7) have not learnt any addresses yet, the following sequence of events occur at the times indicated, where time = 0 is the time at which the network is ready for forwarding. There is no other traffic on the network. Time 1 sec 5 sec 10 sec 15 sec 20 sec 25 sec Answer the following questions. a) Show the forwarding table of Bridge 1 at time b) Show the forwarding table of Bridge 3 at time = 28 sec c) List the segments on which the transmission at time = 5 sec is seen d) List the segments on which the transmission at time = 20 sec is seen E G Event Station A sends a frame to Station B Station C sends a frame to Station B Station B replies to station C Station B replies to station A Station A sends a frame to Station C Station C sends a frame to Station A A Note that the loops have to be removed before learning and forwarding happen. Therefore, the tree to be considered is the one obtained after the spanning tree protocol converges (see Module 10 Lesson Plan). B2 B3 Port 2 Port 1 B6 Station C Station A B1 = 14 sec B5 = Table 1 Station B B4 B7 Port 3 Port 2 Port 1 F H B K
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