ExamGecko
Question list
Search
Search

List of questions

Search

Related questions











Question 44 - CWAP-404 discussion

Report
Export

How is the length of an AIFS calculated?

A.
DIFS + SIFS + AIFSN
Answers
A.
DIFS + SIFS + AIFSN
B.
SIFS + AIFS * Time Unit
Answers
B.
SIFS + AIFS * Time Unit
C.
SIFS * Slot Time + AIFSN
Answers
C.
SIFS * Slot Time + AIFSN
D.
AIFSN * Slot Time + SIFS
Answers
D.
AIFSN * Slot Time + SIFS
Suggested answer: D

Explanation:

The length of an AIFS (Arbitration Interframe Space) is calculated by multiplying the AIFSN (Arbitration Interframe Space Number) by the Slot Time and adding the SIFS (Short Interframe Space). An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. Each AC has a different AIFSN value, which determines how long it has to wait before attempting to access the medium. A lower AIFSN value means a higher priority and a shorter waiting time. The Slot Time is a fixed value that depends on the PHY type and channel width. The SIFS is the shortest interframe space that is used for high-priority transmissions, such as ACKs or CTSs. The formula for calculating the AIFS length is: AIFS = AIFSN * Slot Time + SIFS.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 7: QoS Analysis, page 194-195

asked 16/09/2024
Simone Mento
28 questions
User
Your answer:
0 comments
Sorted by

Leave a comment first