Answers to the “LAN Switching Logic” Question
I posted a question about LAN Switching a few days back. Here are the answers! Post with any related clarifications or comments.
The key to this question is that the scenario and the question tell us that the switches use all default configuration, and that the switches have not learned any information yet. That means that the switches have no dynamically-learned MAC table entries, and no statically-configured MAC table entries. Based on these facts, you can know that both SW1 and SW2 will flood the frame.
Flooding means that a switch forwards the frame out all ports in the same VLAN, except for the port in which the frame arrived. In this case, SW1 does no send the frame back out its F0/1 port, because the frame came in that port. SW1 does send it out it’s other three ports, F0/2, G0/,1 and G0/2.
SW2 receives the frame on its G0/2 port. SW2 uses the same flooding logic, because based on the scenario and question, SW2 has no MAC table entries. So, SW2 does not forward the frame out G0/2, but does forward it out F0/9.
Router R1 does not forward Ethernet frames, because routers remove the Ethernet header and trailer as part of the routing process. Just based on wording, routers in general do not forward Ethernet frames, but do forward the packets that might arrive at the router inside Ethernet frames. So, R1 will not forward the Ethernet frame, although R1 might forward the packet inside the frame. Note that this logic may seem a bit picky, but it is intended to help you notice the use of the words frame and packet, and recall that switches forward frames, and routers forward packets.
So, the answers in this case: B, C, D, and E.