Chapter 7 quiz

Question 1

What is the term used for the information received by the PHY and ready to be processed by the PHY (PLCP) for transmission?

PSDU

PPDU

MSDU

LSDU

Answer 1

PSDU (Physical service data unit)

Question 2

What does a PPDU have that a PSU does not?

Destination MAC address

A PLCP header and PHY preamble or training information

Frame Control field

Data Payload

Answer 2

A PLCP header and PHY preamble or training information

Question 3

The guard interval is a small space between what other 802.11 components?

Frames

IFS

Symbols

DIFS

Answer 3

Symbols

Question 4

What was the length of the original guard interval before it was shortened with the ratification of 802.11n?

800 ms

800 ns

400 ms

400 ns

Answer 4

800 ns

Question 5

What is the name of the first field in the 802.11 general frame format?

Duration/ ID

Frame Control

FCS

None of these

Answer 5

Frame Control

Question 6

What kind of frame must be transmitted by a STA when that STA successfully receives a data frame?

Beacon

Authentication

Probe response

ACK

Answer 6

ACK

Question 7

When active scanning is used, what frame types are involved in the exchange?

Beacon and Acknowledgment

Probe Request and Probe response

Beacon and Authentication

Beacon and Association

Answer 7

Probe Request and Probe Response

Question 8

How is State 2 of the 802.11 state machine described?

Unauthenticated and associated

Authenticated and associated

Authenticated and unassociated

None of these

Answer 8

Authenticated and unassociated

Question 9

After 802.1X/EAP or PSK authentication is successful, what needs to transpire?

Open System Authentication

802.11 association

4-way handshake

BSS selection

Answer 9

4-way handshake

Question 10

Which one of the following is not commonly used by clients in BSS selection, within known algorithms or metrics?

AP vendor ID

AP Beacon signal strength

Desired SSID

Band preference

Answer 10

AP vendor ID