Chapter 10

Question 1

When a host scans the channels one after another to detect the beacons.

Answer 1

Passive Scanning

Question 2

Power Save Mode - lets us know if there is traffic buffered to send

Answer 2

Traffic indication map (TIM)

Question 3

empty message used to ask a node not to go to power save mode.

Answer 3

ATIM

Question 4

The total time Station ‘A’ waits to send its packet is called

Answer 4

Contention Window

Question 5

This is a reservation of the medium that includes the time to send the SIFS and the wait time to receive the ACK.

Answer 5

Network Allocation Vector (NAV)

Question 6

Total amount of time in the countdown of the slot timer

Answer 6

Back Off Timer

Question 7

The randomized period that CSMA/CA uses to count down to send a frame is called

Answer 7

Slot Timer

Question 8

Slot Time speed for 802.11b

Answer 8

20ms

Question 9

Slot Time speed for 802.11a/g

Answer 9

9ms

Question 10

The frame has the highest priority and has the shortest waiting period

Answer 10

Short Interframe Space (SIFS)

Question 11

Medium priority frame

Answer 11

Point-coordination Interframe Space (PIFS)

Question 12

Lowest priority frame for normal traffic

Answer 12

Distributed-Coordination IS

Question 13

This type of frame helps with the session

Answer 13

Control Frame

Question 14

This type of frame manages the sessions

Answer 14

Management Frames

Question 15

3 types of Management Frames

Answer 15

SIFS / PIFS / DIFS

Question 16

Wireless frame are sent in ____ Duplex known as _ _ _

Answer 16

Half HDX

Question 17

Function where No central device controls who sends packets first, commonly used media access function, Each device takes care of itself, and the AP don’t usually control this at all.

Answer 17

Distributed Coordination Function

Question 18

Function where the AP’s poll the devices to see if they have messages to send. Not commonly used.

Answer 18

Point coordination Function (PCF)

Question 19

What type of frame is this and will it have a preference of what network it joins? If so, which one?

Answer 19

Probe Request

It is an Active Scanning packet that is looking for the coherer network

Question 19

Know these!

Answer 19

Hope you know them!

Question 20

Uses Beacon Frames to join with a network

Answer 20

Passive Scanning

Question 21

Uses Probe Request and Probe Response to join a wireless network

Answer 21

Active Scanning

Question 23

Wireless Host Authentication Process

Steps and Packet Types

Answer 23

1. Client sends a authentication request
2. AP sends back a authentication response
3. The client sends back an association request

4.AP sends back an association response

Question 24

The AP sends a _________ Packet to disconnect a host

Answer 24

De-Authentication

Question 25

• A host sends a packet to disconnect from the AP

Answer 25

Dis-Association

Question 26

When an AP switches from DCF to PCF, what does the AP do every time?

Answer 26

Sends out a packet with a timer of

32786

Question 27

When an AP switches from DCF to PCF, this time period is called ____

Answer 27

Contention Free Window (CFW)

Question 28

Control packet that the AP sends out to see if a host has anything to send. It’s “surveying” its hosts.

Answer 28

CF-Poll (Contention Free - Poll)

Question 29

In an enterprise setting, the APs are managed by the WLC by this protocol.

Answer 29

LWAPP (In the Cisco environment)

Question 30

What protocol does a WLC use to differentate between different SSIDs

Answer 30

802.1q

DUH!

SSID = Logical Subnet = VLAN

Question 31

LWAPP encapsulates the packet in a __ byte header

and contains 2 values

Answer 31

6

Client SSID

SNR Value