How is the address field used in PPP? Justify your answer.
Try an answer before revealing the guidance below.
Key Concepts
- Point-to-point link
- Address field 11111111
- Only one receiver
- Header compression
Answer Approach
- Recall how many nodes are on a PPP link.
- Ask whether an address is needed to identify the receiver.
- Recall the fixed value used and whether the field can be omitted.
Full Answer
Answer status: Draft answer (unofficial). Revision notes, not an official marking scheme.
It is effectively unused. PPP runs over a point-to-point link with exactly one sender and one receiver, so there is no need to identify the destination. The address field is always set to 11111111 (all stations), and the two ends can negotiate to omit it (address/control field compression) to save overhead.
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