Chapter 2

Question 1

help ensure different products from different vendors function in the same capacity.
Advantages of standards:

Answer 1

Standards

Question 2

ensures devices from one vendor will function with those from other vendors

Answer 2

Interoperability

Question 3

any vendor can create a device based on a recognized standard and will add additional features to their products to make them more competitive (increases value for users)

Answer 3

Competition

Question 4

Common practices that the industry follows for various reasons

Answer 4

De facto standards

Question 5

Official standards

Answer 5

De jure standards

Question 6

Usually industry-sponsored organizations that want to promote a specific technology

Answer 6

Consortia-created standards

Question 7

To reduce confusion, in 2007 IEEE combined the standards and amendments into a single standard

Answer 7

IEEE 802.11-2007

Question 8

All types of light

Answer 8

Light spectrum

Question 9

Can be used for wireless transmissions, Invisible

Answer 9

Infrared light

Question 10

Device that transmits a signal

Answer 10

Emitter

Question 11

Device that receives a signal

Answer 11

Detector

Question 12

requires that the emitter and detector be directly aimed at one another in a line of sight (LoS) path

Answer 12

Directed transmission

Question 13

relies on reflected light

Emitters have a wide-focused beam instead of narrow and are pointed at a ceiling (reflection point)

Answer 13

Diffused transmission

Question 14

can penetrate through objects
Provides mobility
Radio waves travel longer distances
Can be used indoors and outdoors
Radio waves can travel at much higher speeds than infrared transmissions
IEEE 802.11 standard outlining radio wave transmissions has become preferred method for wireless LANs

Answer 14

Radio Wave Transmissions

Question 15

amendment added two higher speeds (5.5 Mbps and 11 Mbps) to original 802.11 standard
Uses ISM band
Supports wireless devices up to 107 meters (350 feet) apart

Answer 15

802.11b

Question 16

official term given to a wireless device

Answer 16

Station (STA)

Question 17

theoretical maximum rated speed of a network

Answer 17

Data rate

Question 18

measure of how much actual data can be sent per unit of time across a network

Answer 18

Throughput

Question 19

standard specifies maximum rated speed of 54 Mbps

Range is less than that of 802.11b

Answer 19

IEEE 802.11a

Question 20

Effort to combine best features of 802.11a and 802.11b
Data transfer rates to 54 Mbps
Support devices up to 115 meters apart

Answer 20

IEEE 802.11g

Question 21

Speed: up to 600 Mbps
Coverage area: Double the indoor range and triple the outdoor range
Interference: uses different frequencies to reduce interference
Security: requires the strongest level of wireless security

Answer 21

IEEE 802.11n

Question 22

Connects computer to network so that it can send and receive data

Answer 22

Network interface card (NIC)

Question 23

Portable laptop computers often support wireless NICs in different form factors

Answer 23

PCMCIA (Personal Computer Memory Card International Association) cards

Question 24

enhanced type of PC Card that includes a bus mastering feature (allows a controller on the bus to talk to other devices or memory bypassing the CPU)

Answer 24

CardBus

Question 25

Wireless connection management utility (introduced in Windows XP) that operates as a Windows service Automatically determines which wireless network to connect to based on default settings and preference set by user

Answer 25

Wireless Zero Configuration (WZC) service:

Question 26

replace WZC in Windows 7

Answer 26

WLAN AutoConfig

Question 27

Two basic function: Base station for wireless network Bridge between wireless and wired networks

Answer 27

Access Points

Question 28

Considered independent because they are separate from other network devices Have intelligence to manage authentication, encryption, and other functions for wireless clients Also called fat access points

Answer 28

Autonomous Access Points

Question 29

Does not contain management and configuration functions | Those features are contained in a central device called wireless LAN controller (WLC) or wireless switch

Answer 29

Lightweight Access Points

Question 30

used to manage multiple WLCs at remote sites from a central location

Answer 30

Remote office WLAN controller

Question 31

communicates with the next closest mesh access point

Answer 31

Mesh Access Points

Question 32

created by dozens or even hundreds of mesh access points Also known as wireless mesh routers (function in a similar manner to routers) Only one mesh AP must be physically connected to the wired network

Answer 32

Wireless mesh network (WMN)

Question 33

connects mesh access points to an Internet connection

Answer 33

Backhaul wireless mesh network

Question 34

Connects two network segments together | Even if they use different types of physical media

Answer 34

Bridge

Question 35

used to connect a wired network segment to a wireless network segment Does not function as a an access point Only supports wired devices, not any other wireless devices

Answer 35

Wireless workgroup bridge

Question 36

Connects two or more wired or wireless networks together that are separated by a longer distance

Answer 36

Remote wireless bridge

Question 37

can only communicate with other bridges not in root mode

Answer 37

Root mode: Root bridge

Question 38

Can only transmit to another bridge in root mode

Answer 38

Non-root mode

Question 39

Extend distance between LAN segments | Placed between two other bridges

Answer 39

Repeater mode

Question 40

Functions as standard AP

Answer 40

Access point mode

Question 41

network device that acts as an entrance to another network

Answer 41

Gateway

Question 42

provides encryption and authentication services for a wireless network Typically serves as the entry point to the wired network Relieves an AP from burden of encryption and authentication

Answer 42

Enterprise Encryption Gateways (EEG)

Question 43

Combines features of an AP, firewall, router, DHCP server into a single hardware device

Answer 43

Residential WLAN Gateway

Question 44

computer can scan for a newly installed WCN capable device

Answer 44

Windows Connect Now (WCN)

Question 45

Devices that obtain power through the unused wires in a standard UTP Ethernet cable Eliminates the need to install electrical wiring where devices might need to be located

Answer 45

Power over Ethernet (PoE) Devices