Chapter 1 review question 2

[Spike700]

Hi,

In review question 2 for chapter 1, the question reads what is in the IEEE Ethernet Frame Header, but one of the answers is the FCS field which I thought was in the trailer. The FCS is shown in the trailer on pgs 76 and 85 of the pdf guide.


Q:

2. Which fields are contained within an IEEE Ethernet frame header? (Choose two.)
A. Source and destination MAC address
B. Source and destination network address
C. Source and destination MAC address and source and destination network address
D. FCS field
A:

2. A, D. An Ethernet frame has source and destination MAC addresses, an Ether-Type field
to identify the Network layer protocol, the data, and the FCS field that holds the answer
to the CRC.

Anyone care to comment? Am I missing something?

Thanks,

Grant

[pconlan]

I know that the word header can be confusing, and it is used in the book becasue that is the wording that you will encounter in other places. It is really referencing the entire encapsulation, which includes the FCS at the end. Some times when a word like that confuses you (especially in a question) just get rid of the other possible answers that it CAN'T be. The other two answers have network layer address in them. That can't be the answer because those are in the IP header.
Hope this helps some, and Good Luck!

[Spike700]

I thought the word header only applied to the front of the encapsulation because the word trailer is used as well. I thought they were two separate things. Also, the answer to the question never says anything about the header, leading me to believe that the question is asking something different then what the answer provides.