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)
Interframe Time Interval Ordering
Understanding the relative durations of interframe time intervals is essential for wireless network protocols like IEEE 802.11. These intervals manage medium access control.
Interval Definitions and Purpose
- SIFS (Short Interframe Space): The shortest interval. Primarily used for priority transmissions like Acknowledgements (ACK) and Clear to Send (CTS) frames, ensuring quick responses.
- PIFS (PCF Interframe Space): Defined as SIFS plus one slot time. Used by the optional Point Coordination Function (PCF) when it has control of the wireless medium.
- DIFS (DCF Interframe Space): Defined as PIFS plus one slot time (or SIFS plus two slot times). This is the standard interval used by stations employing the Distributed Coordination Function (DCF) before transmitting regular data frames.
- EIFS (Extended Interframe Space): The longest interval. It's used after a station receives a frame but cannot decode it properly. This extended period signals an error condition and allows others to access the medium.
Determining the Increasing Order
Based on their typical durations designed for protocol efficiency and error handling, the order from shortest to longest is:
- SIFS
- PIFS
- DIFS
- EIFS
Mapping to Option Letters
The question provides the following identifiers:
- A: PIFS
- B: DIFS
- C: SIFS
- D: EIFS
Matching the determined order (SIFS, PIFS, DIFS, EIFS) to these letters gives us C, A, B, D.
Final Answer Derivation
The sequence C, A, B, D represents the interframe time intervals arranged in increasing order.
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