Exam CWAP-402 topic 1 question 15 discussion

Actual exam question from CWNP's CWAP-402

Question #: 15
Topic #: 1

[All CWAP-402 Questions]

What is the Extended IFS used in 802.11 contention?

A. When the higher data rates are used and you want the fastest medium access times
B. When the lower data rates are used and you want the fastest medium access times
C. When 802.11ac must coexist with 802.11n
D. When a frame reception begins but the received frame is incomplete or corrupted based on the FCS

Show Suggested Answer

Suggested Answer: C 🗳️

by Truthliswhat at March 19, 2021, 6:34 p.m.

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tonydiamond

11 months, 2 weeks ago

EIFS The Extended Interframe Space (EIFS) is used when a station receives a frame which fails the Frame Check Sequence (FCS), in which case it waits an EIFS to give the sending station an opportunity the retransmit. The EIFS is the longest of all IFS and so is called “Extended”. I also like to think of the “E” representing that an error may have occurred which helps me to relate it back to a failed FCS.

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aniket2610

2 years, 1 month ago

Selected Answer: D

Agree with THruthliswhat. Correct answer is D

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Truthliswhat

4 years, 3 months ago

Answer is D - When a frame is received with errors or corrupted the receiver will respond with EIFS which tells the sender to wait for a longer period so it can see if the packet was delivered correctly. Once this happens, it will start go back to using a normal DIFS or AIFS

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