CCENT/CCNA ICND 1, Chapter 2

Unanswered Question
May 10th, 2010

I recently purchased the CCENT/CCNA ICND 1 Official Exam Certification Guide.  I am pretty familiar with network functionality but not the specifics, so I  am currently reading the book to get the CCENT certification.  I'm on chapter 2 and chose to take the "Do I Know This Already?" quiz before and after reading the chapter to see if my knowledge grew.  I definitely did better, but I did miss one and I'm a bit confused about the question/answer.  If you do not have access to this quiz, it states that Questions 1-6 will be in relation to the TCP/IP Protocol Architecture and Questions 7-10 will be in relation to the OSI Reference Model.  Question six goes as follows:

Which of the following terms is used specifically to identify the entity that is created when encapsulating data inside data link layer headers and trailers?

a. Data

b. Chunk

c. Segment

d. Frame

e. Packet

f. None of these--There is no encapsulation by the data link layer.

I chose F(None of these--There is no encapsulation by the data link layer), because according to Figure 2-7(Perspectives on Encapsulation and "Data), Segment, Packet, and Frame all refer to a different layer, which are segment - transport, packet - internet, and frame - network access.  When I look up the answers, it states that D(Frame) is the correct answer.  I was under the impression that this was saying that each term ONLY refers to THESE corresponding layers.  Am I understanding it wrong?

The only other thing I could think of is that when it says Data Link layer, it is referring to the OSI equivalent to that portion of the TCP/IP protocol.  However, it says nothing about the network access layer(unless it is just universally understood that data link=network access in these questions) and it specifically says that questions 1-6 will be on the TCP/IP protocol.  Is there in fact encapsulation by the data link layer and I missed that somewhere in the chapter?  I guess it would make sense, considering data link is encompassed inside the network access layer, but I'm still confused about the wording.  Does anyone have this book and can help out or know more about this than I do and can clarify?  Any help would be appreciated. 

I have this problem too.
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