Which of the following statements is/are true with regard to various layers in…
2019
Which of the following statements is/are true with regard to various layers in the Internet stack?
P: At the link layer, a packet of transmitted information is called a frame.
Q: At the network layer, a packet of transmitted information is called a segment.
- A.
P only
- B.
Q only
- C.
P and Q
- D.
Neither P nor Q
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Correct answer: A
Layer naming conventions: different layers in the Internet (TCP/IP) stack use specific names for the units of transmitted information.
Link layer: frames — the data units on a single physical link are called frames (link-layer frames).
Network layer: packets or datagrams — the network-layer unit is called a packet (for example, an IP packet).
Transport layer: segments — TCP uses segments (the term 'segment' belongs to the transport layer, e.g., TCP segment).
Conclusion: statement P is true and statement Q is false because Q incorrectly names the network-layer unit as a segment. Therefore only the statement that the link-layer unit is called a frame is correct.
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