Problem6 Consider an Ethernet with the topology shown in Figure 2. Suppose that
ID: 3710384 • Letter: P
Question
Problem6 Consider an Ethernet with the topology shown in Figure 2. Suppose that host A sends a frame to host I, and host I responds a frame to host A. Initially, all switch tables are empty. 4 3 2 3 4 3 4 2 3 4 Figure 2. lllustration of a multi-switch Ethernet. a) Suppose that the frame sent by A arrives at S1 at time t1, S4 at time t2, S2 at time t3, and S3 at time t4. Give the content of the switch tables at S1, ..., S4 (each entry contains fields "MAC address", "interface", "time") when the frame arrives at host I. Suppose that the response frame sent by I arrives at S3 at time t5, S4 at time t6, and S1 at time t7. Give the content of the four switch tables when the frame arrives at host A Is the response frame received by S2? Why? b) c)Explanation / Answer
Solution:
A) The content of the switch tables at S1, S2, S3 and S4 (Each entry contains MAC address, interface, time)
Entry at S1: (Mac Address of A, interface 2, t1) //interface 2, because S1 recieved frame from A at that interface
Entry at S4: (Mac Address of A, interface 1, t2)
Entry at S2: (Mac Address of A, interface 1, t3)
Entry at S3: (Mac Address of A, interface 1, t4)
-----------------------------------------------------------------------------------------------------------------------------------------------------
B) The content of the switch tables at S3, S4 and S1 (Each entry contains MAC address, interface, time)
Entry at S3: (MAC address of I, interface 4, t5)
Entry at S4: (MAC address of I, interface 3, t6)
Entry at S1: (MAC address of I, interface 1, t7)
---------------------------------------------------------------------------------------------------------------------------------------------------
C) No. The response frame is not recieved by S2. Because, S4 selects interface 1 to forward the frame destined to Node A. The forwarding is done based on the entry in the switching/forwarding table of S4.
---------------------------------------------------------------------------------------------------------------------------------------------------
PLEASE UPVOTE, IF YOU ARE HAPPY WITH THE ANSWER
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.