CWNP Exam CWAP-404 Topic 2 Question 21 Discussion

Actual exam question for CWNP's CWAP-404 exam

Question #: 21
Topic #: 2

[All CWAP-404 Questions]

Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection.

The CRC is calculated over what?

AMac Header and Frame Body only

BFrame Body only

CPHY Header, MAC Header and Frame Body

DPHY Header and Mac Header only

Show Suggested Answer

Suggested Answer: D

Every Beacon frame must contain a DTIM is not a true statement concerning DTIMs. DTIM stands for Delivery Traffic Indication Message, and it is a subfield within the TIM (Traffic Indication Map) element in a Beacon frame. The DTIM indicates how many Beacon frames (including the current one) will appear before the next DTIM. For example, if the DTIM interval is set to 3, it means that every third Beacon frame will contain a DTIM. Buffered broadcast and multicast traffic will be transmitted following a DTIM, so that STAs in power save mode can wake up and receive them. The DTIM interval can also dictate when an STA will wake up to listen to Beacon frames, as some STAs may choose to only listen to Beacon frames that contain a DTIM . Reference: CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 200; CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 201.

by Stephaine at Sep 16, 2024, 02:11 AM

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Helga

2 months ago

Wait, so the FCS is like a security guard for the frame? Better make sure they're checking the whole thing, or else it's like leaving the front door open while you're out back sunbathing. *laughs*

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Earleen

8 days ago

Exactly! The FCS needs to cover all parts of the frame to ensure no errors slip through.

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Mariann

12 days ago

C) PHY Header, MAC Header and Frame Body

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Brianne

1 months ago

A) Mac Header and Frame Body only

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France

2 months ago

I'm going with C. The whole frame needs to be protected from errors, not just the juicy bits. Although, I do wonder how they come up with these question options sometimes. *rolls eyes*

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William

10 days ago

I always find it interesting how they come up with the answer options for these questions.

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Noe

12 days ago

I'm not sure, but I think C makes the most sense for error detection.

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Lynelle

2 months ago

Yeah, I agree. It's important to detect errors in all parts of the frame.

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Gerri

2 months ago

I think C is the correct answer too. We need to protect the entire frame.

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Margurite

2 months ago

D has to be the correct answer. The PHY and MAC headers are the important parts, right? Who cares about the frame body anyway? *chuckles*

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Bobbye

2 months ago

Hmm, I'm not sure. I thought the CRC was just for the frame body, but now I'm second-guessing myself. I better review the material on error detection.

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