Deck 7: Wi-Fi Wireless Local Area Networks

Question 1

Power over Ethernet delivers power to an AP through the same wires used for data in a standard unshielded twisted pair (UTP) Ethernet cable.

Answer 1

True

Question 2

If the AP does not send the SSID of the WLAN in the beacon, client devices can still obtain the SSID by _______.

A) sending an associate request frame
B) transmitting an SSID request frame
C) sending a probe frame
D) transmitting a special data frame

Answer 2

C

Question 3

Network managers like to subdivide large networks into smaller units known as subnets because this makes it easier to manage the entire network.

Answer 3

True

Question 4

In PCF, the client devices cannot transmit unless ________.

A) the WLAN is operating in peer-to-peer mode
B) the AP sends an ACK frame
C) the AP sends data first
D) the client is "polled" by the AP

Question 5

The method used in 802.11 to implement CSMA/CA is based on ______.

A) DSSS
B) DCF
C) FHSS
D) PCF

Question 6

The PLCP frame preamble and header are always transmitted at ____ Mbps.

A) 2
B) 5.5
C) 1
D) 11

Question 7

The IEEE _____ standard defines a local area network that provides cable-free data access at a rate of up to 2 Mbps for clients that are either mobile or in a fixed location.

A) 802.3
B) 802.21
C) 802.11
D) 802.3.1

Question 8

A PLCP frame is made up of three parts, which are the preamble, the header, and the _____.

A) error correction
B) CRC
C) SIFS
D) data

Question 9

Some vendors have already integrated the components of a wireless NIC directly onto the notebook's _____.

A) motherboard's chipset
B) floppy drive
C) hard drive
D) CD-ROM drive

Question 10

In ad hoc mode, the wireless clients communicate directly with the AP.

Question 11

The range of an AP acting as the base station is approximately _____.

A) 573 feet
B) 375 feet
C) 750 feet
D) 735 feet

Question 12

The IEEE 802.11b standard that outlines the specifications for RF WLANs is based on _____.

A) FHSS
B) DSSS
C) infrared
D) OFDM

Question 13

An Extended Service Set (ESS) consists of two or more BSSs.

Question 14

IEEE 802.11 operates in ______ mode, and each frame must be acknowledged.

A) ACK
B) FDMA
C) half-duplex
D) full-duplex

Question 15

Which of the following is not a function of an AP?

A) sends and receives RF signals
B) connects to the wired network
C) serves as a router
D) acts as a bridge between the wired and wireless networks

Question 16

Because all the IEEE WLAN features are isolated in the PHY and _____ layers, any network operating system or LAN application will run on a WLAN without any modification.

A) MAC
B) network
C) PLCP
D) PMD

Question 17

The highest data rate for an 802.11 RF WLAN is about ______ Mbps.

A) 22
B) 1
C) 2
D) 54

Question 18

A wireless NIC performs the same functions as a wired NIC except that it_____.

A) does not transmit the packet
B) uses an antenna instead of a wired connection
C) contains special memory
D) does not use parallel transmission

Question 19

The Physical Layer Convergence Procedure (PLCP) standards for 802.11b are based only on _____ spread spectrum.

A) frequency hopping
B) QAM
C) direct sequence
D) BPSK

Question 20

On a regular basis, wireless clients will scan all the radio frequencies to determine if a different AP can provide better service.