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Lesson 3 Flashcards

(58 cards)

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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

Study These Flashcards
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
Microwave Transmissions
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
wireless Internet Service Providers
WISPs
27
Topic B
Topic B
28
WAP or AP
Access to the network
29
SSID
32 bit alpha numeric string that identifies the WAP
30
Many systems come with a default SSID
True
31
SSID mismatch
occurs when a device receives a packet that contains different SSID than its own.
32
Devices must have the same SSID as the WAP in order to work
True
33
SSID mismatches are rare because
They are done automatically
34
SSID mismatches are rare because
They are done automatically
35
What provides LAN mgmt
Wireless Controllers for the multiple access points
36
How do you control multiple access points
Wireless LAN Controllers
37
Wireless LAN controllers are used in conjunction with what to controller
LWAPP Lightweight Access Control Protocol to manage lightweight access points It can be hardware or software
38
Wireless Bridge
Used to connect two wired bridges using wireless technologies
39
Name the wireless antenna types
Directional Omni Directional
40
Wireless Antenna Performance Factors
Pg 117
41
WLAN
Spans a small area, building, floor or room
42
Name some wireless LAN components
``` Station Access Point Service Sets BSS or BSSID ESSID IBSS Distribution System ```
43
Distributed Coordination Function
A collision avoidance method that controls access to the physical medium.
44
What are two modes for 802.11
Infrastructure and ad-hoc modes
45
Infrastructure mode
utilizes one or more WAPs to connect workstations to the cable backbone Uses BSS or ESS Uses hub and spoke topologies
46
Ad-Hoc
Also called IBSS Utilizes peer to peer configurations which each workstation talks directly to other workstations Uses mesh topologies
47
SSID broadcasts
Continuous announcements by a WAP that transmits its name or SSID
48
Name some mobile devices
``` Mobile Phone Laptop Tablet Gaming Device Media Device ```
49
Guidelines for implementing a wireless network
Pg 121
50
MUMIMO
Multi-User MIMO
51
MIMO
Multiple Input Multiple Output
52
What is a WPAN
Wireless Personal Area Network
53
Bluetooth freq range and Mbps
2.4 Ghz 24 Mbps
54
An increase in the amplitude of a radio wave is called what
Gain
55
Types of wireless technology
Infrared Radio Microwave
56
DCF
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
What are some factors when deciding on the placement of WAPs
Building Layout Coverage Area Clients Obstacles Interference
58
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