MAC Architecture

Question 1

What does a DLL have?

Answer 1

Logical Link Control LCC
Maintains the flow control
MAC Media Access Control
where mac address resides

Question 2

What does MSDU have?

Answer 2

Contains data from Layers 3-7 and the LCC
The data payload
Maximum size of 2304 bytes

Question 3

What is MPDU?

Answer 3

Encapsulates the MSDU

Question 4

What does a physical layer have?

Answer 4

Physical Layer Convergence Protocol PLCP
Physical Media Dependent PMD
PSDU - services data unit
PLCP - protocol data unit

Question 5

802.11 Frame types

Answer 5

Management Frame
Control Frame
Data Frame

Question 6

Management Frames

Answer 6

Association request and response
Reassociation request and response
Probe request and response

Question 7

Beacon frame

Answer 7

Time stamp
SSID
Data rates

Question 8

Passive scanning vs active scanning

Answer 8

Passive scanning listens for Beacon Frames

Active scanning use probe request and response frames

Question 9

List states of the authentication

Answer 9

State 1:
Unauthenticated
Unassociated
State2:
Authenticated
Unassociated
State3:
Authenticated
Associated

Question 10

10 steps of authentication from the top

Answer 10

1. Listen for beacons
2. Probe request
3. Probe response
4. Authentication request
5. Authentication response
6. Association Request
7. Association Response
8. opt. EAPOL Authentication
9. opt Encrypt DATA
10. Move user DATA

Question 11

Whats a control frame?

Answer 11

Power Save Poll
Request to Send RTS
Clear to send

Question 12

What are data frames?

Answer 12

Can be pure data
Can be null data
Can be combined with other functions

Question 13

What is power management?

Answer 13

Saves battery life

Two modes used Active Mode Power saver mode