Arrange the following interframe time interval in increasing order. A. PIFS…
2025
Arrange the following interframe time interval in increasing order.
A. PIFS (PCF interframe Spacing)
B. DIFS (DCF interframe Spacing)
C. SIFS (Short interframe Spacing)
D. EIFS (Extended interframe Spacing)
Choose the correct answer from the options given below:
A, B, C, D
B, C, A, D
D, A, B, C
C, A, B, D
Answer: D. 4 — ConceptIEEE 802.11 uses interframe spaces to assign medium-access priority: a shorter waiting interval lets a transmission contend or respond sooner. The…
- A.
1
- B.
2
- C.
3
- D.
4
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Show answer & explanation
Correct answer: D
Concept
IEEE 802.11 uses interframe spaces to assign medium-access priority: a shorter waiting interval lets a transmission contend or respond sooner.
The basic timing relations are PIFS = SIFS + one slot time and DIFS = SIFS + two slot times. EIFS is an extended recovery interval used after a frame is received in error, so it is longer than the normal access intervals.
Application
SIFS comes first because it is the base short interval used for immediate response traffic such as acknowledgements.
PIFS comes next because it adds one slot time to SIFS.
DIFS follows because it adds two slot times to SIFS, making it longer than PIFS.
EIFS comes last because it is the extended waiting interval used after an erroneous frame reception.
Cross-check
The priority rule and the timing formulas agree: SIFS < PIFS < DIFS < EIFS. Substituting the stem labels gives C, A, B, D.
Therefore, the increasing-order sequence is C, A, B, D.