Q: Parsing Layer and Header Terminology
One big challenge for #CCENT and #CCNA test takers is interpreting tons of new terminology. Today’s post poses a question about headers and encapsulation, with plenty of terms. You job is simple: interpret the scenario, the terms, and answer the question. As usual, feel free to post questions about this question. Is it clear? If you saw this on the actual exam, what would be clear, and what wouldn’t be? I’ll post an answer and some explanation in a few days!
Also, as a courtesy, if you want to offer your answer, please do so, but don’t put it in the heading for your comment, to avoid spoiling it for others. The answers post (posted a few days after this post) will be linked at the bottom of this post. Thanks!
The Figure shows a small network with two user PCs (hosts A and B) on the left, and a web server (host C) on the right. The LAN switches each use only the default VLAN 1, with all ports in that VLAN. The user at PCs A and B can connect to the web server to display its home page. The hosts use the IP addresses and subnets as shown in the figure.
Note that host A uses router B1 as its default gateway, and host B uses router B2 as its default gateway.
Amy and Bob use the free Wireshark network analyzer software on host A to examine the data host A sends and receives. They examine the Ethernet header of a frame, and then argue about terminology that accurately refers to this header and the data encapsulated between this header and the Ethernet trailer. Which of the following are true?
A. The header is a Data Link layer header
B. The header is a Physical layer header
C. The header is one header in a layer 3 PDU
D. The header is part of TCP/IP Network Access layer
E. The header is the only header in a layer 2 PDU