Question 1
Explanation
Each port on a switch is a collision domain while each VLAN is a broadcast domain because broadcast is only forwarded within that VLAN so we have 48 collision domains and 4 broadcast domains on this switch (if all ports are used).
Question 2
Question 3
Explanation
When a switch receives a frame, it first checks for the destination MAC address and tries to find a matching entry in its MAC address table. If found, the switch then forwards that frame on the corresponding port associated with that MAC address. If no entry is found, the switch will flood that frame out of all (active) ports except the port that sent it.
Question 4
Question 5
Question 6
Explanation
A hub is not as “intelligent” as a switch because a hub does not try to remember anything passing to it. It just floods out all the ports (except the one that sent it) when it receives a frame.
Question 7
Explanation
When a switch receives a frame, it first checks for the destination MAC address and tries to find a matching entry in its MAC address table. If found, the switch then forwards that frame on the corresponding port associated with that MAC address. If no entry is found, the switch will flood that frame out of all active ports except the port that sent it. In this case, the destination MAC address 0000.00dd.dddd has not been in the MAC address table so the switch will flood the frame out all of its ports except fa0/0 (the port that it received the frame) -> D is correct.
Also, the switch learns that the MAC address 0000.00aa.aaaa is received on fa0/0 -> the switch adds 0000.00aa.aaaa and its corresponding port fa0/0 to the MAC address table -> A is correct.
Question 8
Explanation
The destination MAC address is ffff.ffff.ffff so this is a broadcast frame so the switch will forward the frame out all active switch ports except for port fa0/0.
Question 9
Explanation
In this case the destination MAC address has been learned so the switch just forwards the frame to the corresponding port. It also learn that the source MAC address of host A has not been existed in the MAC address table so it will add it (and port fa0/3) to its MAC address table.
Question 10
Question 11