NTC/362: Fundamentals of Networking
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NTC/362: Fundamentals of Networking
Q: Refer to the exhibit; this output comes from a network analysis tool. It lists a group of lines for each header in a PDU, with the frame (data link) header at the top, then the next header (typically the IP header), and so on. The first line in each section has a gray highlight, with the indented lines below each heading line, listing details about the fields inside the respective header. You will need to remember some parts of the various headers and compare those concepts to this output, to answer this question.
In describing line A from the graphic with an OSI model perspective, which is the correct label to be used in combination with that PDU?
A: Frame
Explanation: At Layer 2 of the OSI model, the protocol data units (PDUs), including their header information at that layer, are called frames.
Segments refer to PDUs at Layer 4. Packets refer to PDUs at Layer 3. Bits are related to the Physical Layer, which is Layer 1. A PDU represents the bits that include the headers and trailers for that layer and the encapsulated data. The term datagram can be used generically but is also specifically part of the name in the User Datagram Protocol, which is at Layer 4.
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