Here follows a mix of various statements about link layer protocols and equipmen

Question

Here follows a mix of various statements about link layer protocols and equipment. Which of the statements are correct? Ethernet (IEEE 802.11) and WLAN (IEEE 802.11) both use the same MAC address format and the same MAC address space. Ethernet has gone from a shared bus topology to a star topology with an active switch in the middle. This was necessary in order to bring Ethernet to gigabit speed and beyond. Ethernet is for carrying Internet traffic. Hence, an Ethernet switch only knows how to switch IP datagrams. A switch that encounters a MAC destination address that it does not recognize, uses ARP to find out where the recipient is. An Ethernet switch forwards frames through broadcasting, so that each frame is sent on all ports.

Explanation / Answer

1. Ethernet (IEEE802.11) and WAN (IEEE802.11) both use the same MAC adress fromat and the same MAC address space.

Ans: Correct! VLAN is nothing but a subset of Ethernet to minimize the broadcast domain.

2. Ethernet has gone from a shared bus topology to a star topology with an active switch in the middle. This was necessary to bring Ethernet to gigabit speed or beyond

Ans: Correct! Switch moved to bus topology to Start topology to minimize the collision domain. Dedicated link will be there for each host which has high speed capable. So speed will be increased.

3. Ethernet is for carrying internt traffic. Hence, an Ethernet switch only knows how to switch ip datagrams.

Ans: Incorrect! Switch does more than that. It runs ARP, Creates VLAN, works for TCP as well.

4. A switch that encounters a MAC destination address that is does not recognize, uses ARP to find out where the recipient is.

Ans: Incorrect! Switch do not find the address, it will broadcast the packet to all the ports(Just like in learning stage of switch)

5. An Ethernet switch forwards frames through broadcasting, so each frame is sent on all ports.
Ans: Incorrect! Switch forwards packet/frames to dedicated port, using ARP protocal(or sometimes reffered as IP-MAP table)

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