What is the answer to this question with this change : the 4th transmission (B s

Question

What is the answer to this question with this change: the 4th transmission (B sends to D) does not occur

2.7.0 Suppose we have the Ethernet switches S1 through S4 arranged as below. All forwarding tables are empty; each switch uses the learning algorithm of 2.4 Ethernet Switches. 54 S2 53 Now suppose the following packet transmissions take place: .A sends to D D sends to A .A sends to B B sends to D For each switch S1-S4, list what source addresses (eg A,B,C,D) it has seen (and thus what nodes it has learned the location 0

Explanation / Answer

When A sends to D, all the switches use fallback-to-flooding as no switch knows where D is.(flooding is the process in which incoming packet is sent to every outgoing link).
Now, all S1 to S4 know where A is.
When D send to A, Since all the swithes know where A is the packet is directly sent to S1 and then A.Now S2 knows where D is.
When A sends to B, all switches again use fallback-to-flooding, but no switch learns anything new.(since S2 does not know position of B).

Switch Known location S1 AD S2 AD S3 A S4 A

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