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Wireless Tech > Chapter 2 > Flashcards

Chapter 2 Flashcards

1
Q

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

A

Standards

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2
Q

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

A

Interoperability

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3
Q

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)

A

Competition

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4
Q

Common practices that the industry follows for various reasons

A

De facto standards

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5
Q

Official standards

A

De jure standards

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6
Q

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

A

Consortia-created standards

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7
Q

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

A

IEEE 802.11-2007

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8
Q

All types of light

A

Light spectrum

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9
Q

Can be used for wireless transmissions, Invisible

A

Infrared light

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10
Q

Device that transmits a signal

A

Emitter

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11
Q

Device that receives a signal

A

Detector

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12
Q

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

A

Directed transmission

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13
Q

relies on reflected light

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

A

Diffused transmission

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14
Q

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

A

Radio Wave Transmissions

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15
Q

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

A

802.11b

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16
Q

official term given to a wireless device

A

Station (STA)

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17
Q

theoretical maximum rated speed of a network

A

Data rate

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18
Q

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

A

Throughput

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19
Q

standard specifies maximum rated speed of 54 Mbps

Range is less than that of 802.11b

A

IEEE 802.11a

20
Q

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

A

IEEE 802.11g

21
Q

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

A

IEEE 802.11n

22
Q

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

A

Network interface card (NIC)

23
Q

Portable laptop computers often support wireless NICs in different form factors

A

PCMCIA (Personal Computer Memory Card International Association) cards

24
Q

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)

A

CardBus

25
Q

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

A

Wireless Zero Configuration (WZC) service:

26
Q

replace WZC in Windows 7

A

WLAN AutoConfig

27
Q

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

A

Access Points

28
Q

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

A

Autonomous Access Points

29
Q

Does not contain management and configuration functions

Those features are contained in a central device called wireless LAN controller (WLC) or wireless switch

A

Lightweight Access Points

30
Q

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

A

Remote office WLAN controller

31
Q

communicates with the next closest mesh access point

A

Mesh Access Points

32
Q

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

A

Wireless mesh network (WMN)

33
Q

connects mesh access points to an Internet connection

A

Backhaul wireless mesh network

34
Q

Connects two network segments together

Even if they use different types of physical media

A

Bridge

35
Q

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

A

Wireless workgroup bridge

36
Q

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

A

Remote wireless bridge

37
Q

can only communicate with other bridges not in root mode

A

Root mode: Root bridge

38
Q

Can only transmit to another bridge in root mode

A

Non-root mode

39
Q

Extend distance between LAN segments

Placed between two other bridges

A

Repeater mode

40
Q

Functions as standard AP

A

Access point mode

41
Q

network device that acts as an entrance to another network

A

Gateway

42
Q

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

A

Enterprise Encryption Gateways (EEG)

43
Q

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

A

Residential WLAN Gateway

44
Q

computer can scan for a newly installed WCN capable device

A

Windows Connect Now (WCN)

45
Q

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

A

Power over Ethernet (PoE) Devices

Wireless Tech (2 decks)

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