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Network + > Lesson 3 > Flashcards

Lesson 3 Flashcards

1
Q

Topic A

A

Topic A

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2
Q

Wireless communication is possible through the use of

A

Electromagnetic waves such as radio waves or micro waves

Light pulses

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3
Q

Wireless should be used when

A

When it is difficult or impossible to connect using wire (hazardous areas, long distances or inside historic buildings)

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4
Q

Wireless connections are

A

point to point

multipoint

broadcasts

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5
Q

Point to point in used when

A

Cellular communications

linking distant buildings CAN MAN or WAN

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6
Q

Multipoint is use when

A

connections to many nodes are needed like wireless networks

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7
Q

Broadcast communications are need when

A

data goes from a source node to all other nods on the network

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8
Q

What is the standard for wireless communications

A

802.11

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9
Q

802.11 defines

A

CSMA/CA

Spread spectrum reliability

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10
Q

802.11b specifies

A

multichannel roaming and automatic rate selection

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11
Q

802.11 ac defines

A

faster wireless communications, better range, improved reliability and Improved power consumption

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12
Q

What is latency

A

time taken for a packet to reach its destination

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13
Q

Latency includes what

A

Checking the data

Correcting errors

resending the packet lost in transit

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14
Q

MIMO does what

A

increase wireless network range and bandwidth

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15
Q

Name the networking standards

A 
802.11 
      Speed  Freq Range Srm
A         54     5       20        1
AC   433      5      35          8  
B        11        2.4    100       1 
G        54      2.4     100      1
N        150     2.4/5   70     4
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16
Q

Name the wireless channels with no overlap

A

1
6
11

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17
Q

What can impact RF transmissions

A

power lines

Metal structures

Atmospheric conditions

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18
Q

Broadcast Radio

A

Single Frequency

High and low frequency versions

Does not travel very far

Easy to install

Inexpensive

High power can travel farther

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19
Q

Spread spectrum

A

Form of radio transmission

Uses more than one frequency

Difficult to eaves drop and capture signals

difficult to distinguish from background noise

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20
Q

Signal Distrobution methods

A

Frequency hopping

direct sequencing

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21
Q

OFDM

A

Uses multiple frequencies simultaneously to send data

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22
Q

DSSS

A

pg 98

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23
Q

Infrared transmission

A

Signals are sent as pulses of IR

300-300,000 Ghz

Just below visible light

Need unobstructed view of receivers

Signal can reflect off hard surfaces

IrDA is the governing body

Used in legacy systems and security sensors

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24
Q

Bluetooth 4.1

A

Short range communications between devices to create a WPAN

Up to eight devices can be connected

Range is 30m; Max is 100 between two devices

Uses RF based media and no need for line of sight

Used with NF communications for POS purchases

25
Q

Microwave Transmissions

A

Point to Point transmissions

1-300 GHZ

Need unobstructed view

Environment can impact signal

Can be reflected of satelites

Used with WANs and MANs

Often used as backhaul comms

Connects core networks with regional networks

Used by WISPs for rural area comm

26
Q

wireless Internet Service Providers

A

WISPs

27
Q

Topic B

A

Topic B

28
Q

WAP or AP

A

Access to the network

29
Q

SSID

A

32 bit alpha numeric string that identifies the WAP

30
Q

Many systems come with a default SSID

A

True

31
Q

SSID mismatch

A

occurs when a device receives a packet that contains different SSID than its own.

32
Q

Devices must have the same SSID as the WAP in order to work

A

True

33
Q

SSID mismatches are rare because

A

They are done automatically

34
Q

SSID mismatches are rare because

A

They are done automatically

35
Q

What provides LAN mgmt

A

Wireless Controllers for the multiple access points

36
Q

How do you control multiple access points

A

Wireless LAN Controllers

37
Q

Wireless LAN controllers are used in conjunction with what to controller

A

LWAPP
Lightweight Access Control Protocol to manage lightweight access points

It can be hardware or software

38
Q

Wireless Bridge

A

Used to connect two wired bridges using wireless technologies

39
Q

Name the wireless antenna types

A

Directional

Omni Directional

40
Q

Wireless Antenna Performance Factors

A

Pg 117

41
Q

WLAN

A

Spans a small area, building, floor or room

42
Q

Name some wireless LAN components

A 
Station
Access Point
Service Sets
BSS or BSSID
ESSID
IBSS
Distribution System
43
Q

Distributed Coordination Function

A

A collision avoidance method that controls access to the physical medium.

44
Q

What are two modes for 802.11

A

Infrastructure and ad-hoc modes

45
Q

Infrastructure mode

A

utilizes one or more WAPs to connect workstations to the cable backbone

Uses BSS or ESS

Uses hub and spoke topologies

46
Q

Ad-Hoc

A

Also called IBSS

Utilizes peer to peer configurations which each workstation talks directly to other workstations

Uses mesh topologies

47
Q

SSID broadcasts

A

Continuous announcements by a WAP that transmits its name or SSID

48
Q

Name some mobile devices

A 
Mobile Phone
Laptop
Tablet
Gaming Device
Media Device
49
Q

Guidelines for implementing a wireless network

A

Pg 121

50
Q

MUMIMO

A

Multi-User MIMO

51
Q

MIMO

A

Multiple Input Multiple Output

52
Q

What is a WPAN

A

Wireless Personal Area Network

53
Q

Bluetooth freq range and Mbps

A

2.4 Ghz

24 Mbps

54
Q

An increase in the amplitude of a radio wave is called what

A

Gain

55
Q

Types of wireless technology

A

Infrared

Radio

Microwave

56
Q

DCF

A

Distributed Coordination Function

Collision avoidance method that controls access to the physical medium

Each station checks the status of the wireless medium before beginning the transmission

57
Q

What are some factors when deciding on the placement of WAPs

A

Building Layout

Coverage Area

Clients

Obstacles

Interference

58
Q

Completed

A

Completed

Network + (13 decks)

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