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Wireless Test 2 > Chapter 9 > Flashcards

Chapter 9 Flashcards

1
Q

Packets?

A

Data Units at the Network Layer

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2
Q

Frames?

A

Data Units at the Data Link Layer

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3
Q

Bits?

A

Binary Digits

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4
Q

Data Link Layer?

A

DLL has two sublayers
Logical Link Control (LLC)
and
Media Access Control (MAC)

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5
Q

Logical Link Control?

A

Establishing Flow Control

Maintains Flow Control

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6
Q

Media Access Control (MAC)

A

802.11 Specified Operations

Where the MAC address resides

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7
Q

What is MSDU?

A

MAC Service Data Unit

- Data portion of MAC coming from LLC

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8
Q

What is MPDU?

A

MAC Protocol Data Unit

- After encapsulation in MAC frame

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9
Q

Detailed MSDU?

A

Contains Data From Layers 3-7 and the LLC
The Data Payload
Only Data Frames Carry the MSDU
Maximum size of 2,304 bytes

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10
Q

Detailed MPDU?

A

Mac Protocol Data Unit
Encapsulates the MSDU
Is an 802.11 Frame

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11
Q

Physical Layer?

A

Has two Sub-Layers

  • Physical Layer Convergence Protocol (PLCP)
  • Physical Media Dependent (PMD)

PLCP Services Data Unit (PSDU)
PLCP Protocol Data Unit (PPDU)

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12
Q

PLCP Data Units?

A

PLCP Services Data Unit
- The same frame as the MPDU
PLCP Protocol Data Unit (PPDU)
- Adds Preamble and PHY Header

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13
Q

802.11 and 802.3 Interoperability

A
  1. 3 Frames are encapsulated within 802.11 frames for Transmisision
  2. 3 Standard frame Max Size = 1518 bytes
  3. 11 standard frame Max Size = 2347 bytes
  4. 11 has four addresses field in header
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14
Q

Possible addresses of 802.11 and 802.3

A 
Receiver Address (RA)
Transmitter Address (TA)
Basic Service Set Identifier (BSSID)
Destination Address (DA)
Source Address (SA)
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15
Q

802.11 Frames

A

Frame Types

  • Management Frame
  • Control Frame
  • Data Frame
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16
Q

Management Frames?

A 
Association request and response.
Reassociation request and response
Probe request, and response
Beacon
ATIM
Disassociation
Authentication, and Deauthentication
Action
Action No ACK
Timing advertisement
17
Q

Beacon Frame Content?

A 
Time Stamp
Parameter Sets
Channel Information
Data Rates
BSS Capabilities
SSID
TIM and DTIM
QoS Capabilities
Security Capabilities
Vendor Proprietary Information
18
Q

What is Passive Scanning?

A

Passive Scanning Stations Listen for Beacon Frames

19
Q

What is Active Scanning?

A

Active Scanning Stations use probe request and response frames

20
Q

Authentication?

A

Stations must authenticate to begin connection with an AP
Failed authentication is the #1 Cause of Failed Association
Many authentication methods exist:
- Open (no credentials required)
- Shared key (uses WEP key_

21
Q

Association?

A

Occurs AFTER authentication
Requires Mutually Supported Functions
Once Associated, Stations can contend for the Medium and Pass Data onto the network

22
Q

States of Authentication and Association?

A

State 1:
Unauthenticated
Unassociated.

State 2:
Authenticated
Unassociated

Stage 3:
Authenticated
Associated

23
Q

State 1 Contains?

A
  1. Listen to Beacons
  2. Probe Request
  3. Probe Response
  4. Authentication Request
  5. Authentication Response
24
Q

State 2 Contains?

A
  1. Association Request

7. Association Response

25
Q

State 3 Contains?

A
  1. (Optional: EAPOL Authentication)
  2. (Optional: Ecrypt Data)
  3. Move user data
26
Q

Basic and Supported Data Rates?

A

Basic Rates are the MANDITORY data rates of the BSS
Supported Rates are the OPTIONAL data rates of the BSS
Information is Found in the beacon management frame

27
Q

Control Frame?

A 
Power Save Poll
Request To Send
Clear to Send
Acknowledgment (ACK)
Contention Free-End
CF-End + CF-ACK
Block ACK Request
Block ACK
Control Wrapper
28
Q

ACK Frame?

A

Acknowledgement Frame
Every unicast frame bu the Standard should be acknowledged
Used due to Inability to Detect Collisions
Provide Delivery Verification

29
Q

Protection Mechanism?

A 
Request to Send / Clear to Send
Clear to Send to Self
Help Combat Hidden Node Issues
Allows Mixed Mode Operations
Creates Additional Overhead
Frames Sent at Lowest Basic Rate
30
Q

Clear to Send to Self

A 
Less overhead than RTS/CTS
From the station to itself
Used in Mixed Mode BSS Operations
Creates Additional Overhead
Frames Sent at Lowest Basic Rate
31
Q

Data Frames?

A

Can be Pure Data
Can be Null Data
Can be combined with other functions
Contains the MSDU

32
Q

Power Management?

A 
Conserves Battery Life
Require use of TIM, DTIM, or ATIM
Two Modes Used
- Active Mode (Always ON)
- Power Save Mode (ON and OFF)
Legacy Power Save Still Used
WMM-PS Used on Newer Devices

Wireless Test 2 (5 decks)

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