Wireless Networking

Question 1

What information that comes from the wired network is used to assign traffic into access categories on a WLAN controller?

Answer 1

802.1D priority tags

Question 2

ACK and CTS-to-self frames follow which interframe space?

Answer 2

SIFS

Question 3

What QoS mechanism can be used to reduce medium contention overhead during a frame burst of low-latency traffic?

Answer 3

Immediate Block ACK

Question 4

Hybrid Coordination Function (HCF) defines what allotted period of time in which a station can transmit multiple frames?

Answer 4

TXOP

Question 5

After the station has performed the carrier sense and determined that no other devices are transmitting for a period of a DIFs interval, what is the next step for the station?

Answer 5

Select a random backoff value.

Question 6

The EDCA medium access method provides for the priortization of traffic via priority queues that are matched to eight 802.1D priority tags. What are the EDCA priority queues called?

Answer 6

Access categories

Question 7

The goal of allocating equal time as opposed to equal opportunity is known as what?

Answer 7

Airtime Fairness

Question 8

ACKs are required for which of the following frames?

Answer 8

Unicast

Question 9

What field in the MAC header of an 802.11 frame resets the NAV timer for all listening 802.11 stations?

Answer 9

Duration/ID

Question 10

The Wi-Fi Alliance certification called Wi-Fi Multimedia (WMM) is based on which media access method defined by the 802.11-2012 standard?

Answer 10

EDCA

Question 11

80211 collision detection is handled using which technology?

Answer 11

Positive collision detection cannot be determined