Knowledge checks


Beacon Frames.



What is the purpose of a beacon frame in WiFi (802.11) networks?




 

That's Correct!

That's Incorrect. Try Again

1/6

Use of ACKs in WiFi.



Why are link-layer ACKs used in WiFi (802.11) networks? [Hint: check two of the boxes below].




 

That's Correct!

That's Incorrect. Try Again

2/6

Why three addresses?



  Why does the WiFi (802.11) link-layer frame have three addresses? [Note: WiFi actually has four MAC addresses in the frame, but we’re only focusing here on the three widely used ones].




 

That's Correct!

That's Incorrect. Try Again

3/6

RTS/CTS frames.



What is the purpose of RTS (request to send) and CTS (clear to send)  frames in WiFi (802.11) networks? Select one or more of the answers below. [Hint: check two answers below].




 

That's Correct!

That's Incorrect. Try Again

4/6

The 802.11 Media Access Control protocol.



  Which of the following statement are true about the 802.11 (WiFi) MAC protocol?




 

That's Correct!

That's Incorrect. Try Again

5/6

Bluetooth.



  Which of the following statement are true about the Bluetooth protocol?




 

That's Correct!

That's Incorrect. Try Again

6/6

We gratefully acknowledge the programming and problem design work of John Broderick (UMass '21), which has really helped to substantially improve this site.

Copyright © 2010-2021 J.F. Kurose, K.W. Ross
Comments welcome and appreciated: kurose@cs.umass.edu