ch.8.pgs.331-342.js

Question 1

What is (WLAN)?pg.332

Answer 1

Wireless LAN. Created standards and managed by Institute of Electrical and Electronics Engineers (IEEE).

Question 2

802.11 networks use Carrier Sense Multiple Access/Collision Avoidance(CSMA/CA) instead of Ethernet’s Carrier Sense Multiple Access/Collision Detection (CSMA/CD). T or F pg332

Answer 2

True. pg332

Question 3

802.11a standard provides WLAN bandwidth of up to ___Mbps in the ___GHz frequency spectrum.pg332

Answer 3

54 Mbps, 5GHz, pg.332

Question 4

802.11b and 802.11a standards are not incompatible. Tor F pg333

Answer 4

True. Because frequency and modulation. 802.11b operates 2.4 GHz and 802.11b at 5GHz.

Question 5

802.11g standard using what frequency spectrum ___,.

Answer 5

OFDM or DSSS encoding. pg.333

Question 6

Devices on the market that can operate with both 802.11b and 802.11g standards are labeled as ____. pg

Answer 6

802.11b/g. pg 333

Question 7

802.11n ratified in 2010 support bandwidth up to ____ but reality the typical throughput is about ___ to ____.pgs334

Answer 7

600 Mbps, 300 Mbps to 450 Mbps.

Question 8

802.11 ac can bond up ___ for a ___ bandwidth.pg335

Answer 8

eight, 160MHz. It doubles the MIMO capabilities of 802.11n to eight streams.pg.335

Question 9

The most important new feature of 802.11ac is ____.pg336

Answer 9

beamforming, can allow for range increases sending signal to specific direction.pg336

Question 10

What is FHSS.pg337

Answer 10

Frequency-hopping spread spectrum. It communicates by hopping transmissions over a range of frequencies.pg337

Question 11

What is DSSS pg.338

Answer 11

Direct-sequence spread spectrum. done by adding the data to be transmitted to a higher-speed transmission.pg338

Question 12

What is OFDM.pg338

Answer 12

Orthogonal frequency division multiplexing. Communicates by breaking data into subsignals and transmits them simultaneously.pg338

Question 13

What is one of the first security standards for wireless devices.pg.339

Answer 13

Wired Equivalent Privacy (WEP).pg339

Question 14

What is WPA2? pg 340

Answer 14

Wi-Fi Protected Access2. It uses the required 802.11i standards and also Counter Mode CBC-MAC Protocol(CCMP) based on Advanced Encryption Standard(AES).pg340

Question 15

What is DSL?pg

Answer 15

Digital Subscriber Line. pg345 Many people moved from ADSL to VDSL because of the 52Mbps downloads and 16Mbps uploads. SPEED!!!!

Question 16

DSL customers do not have to share there bandwidth unlike cable modems. T or F. pg345

Answer 16

True. You are sharing bandwidth within your distribution network. 100-2000 customers. But it is faster than DSL but speeds vary depending on the amount of users in your network.pg.347