ExamGecko
Question list
Search
Search

List of questions

Search

Related questions











Question 29 - CWAP-404 discussion

Report
Export

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

The CRC is calculated over what?

A.
Mac Header and Frame Body only
Answers
A.
Mac Header and Frame Body only
B.
Frame Body only
Answers
B.
Frame Body only
C.
PHY Header, MAC Header and Frame Body
Answers
C.
PHY Header, MAC Header and Frame Body
D.
PHY Header and Mac Header only
Answers
D.
PHY Header and Mac Header only
Suggested answer: A

Explanation:

The CRC is calculated over the MAC Header and Frame Body only. The CRC (Cyclic Redundancy Check) is a 32-bit value that is used for error detection in wireless transmissions. The CRC is calculated over the MAC Header and Frame Body of a PSDU, which are the parts of the data unit that contain information such as source and destination addresses, frame type, frame control, sequence number, payload, etc. The CRC is appended to the end of the PSDU as a FCS (Frame Check Sequence) field. The CRC is not calculated over the PHY Header or PHY Preamble, which are parts of the PPDU that contain information such as modulation, coding, data rate, etc. The PHY Header and PHY Preamble are added or removed by the PHY layer during the conversion between PSDU and PPDU.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 4: 802.11 Physical Layer, page 97-98

asked 16/09/2024
Yves ADINGNI
37 questions
User
Your answer:
0 comments
Sorted by

Leave a comment first