Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CompTIA - Network+ > Wireless Networking > Flashcards

Wireless Networking Flashcards

1
Q

Most common wireless standard

A

802.11 Wireless

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

WAP

A

Wireless Access Point

  • interconnects wireless network nodes with wired networks
  • operates like a hub and works at layer 1
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

link state

A

if device is connected

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

IBSS

A

Independent Basic Service Set

- two or more wireless nodes communicatingin an ad hoc mode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Infrastructure Mode

A

use one or more WAPs to connect the wireless network node centrally

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

WLAN

A

Wireless Local Area Network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

BSS

A

Basic Service Set

- area serviced by a single WAP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

ESS

A

Extended Service Set

- area serviced by added WAPs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

BSSID

A

Basic Service Set Identifier

  • same as MAC address for WAP
  • in ad hoc, nodes generate random 48-bit string of numbers
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

SSID

A

Service Set Identifier

  • 32-bit indentifier inserted into the header of each frame processed by a WAP
  • WAPs advertise existence by sending out continuous SSID broadcasts
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

roaming

A

as clients move through different coverage areas, they will change WAP connections seamlessly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

spread-spectrum

A

broadcasts data in small, discrete chunks over the different frequencies available within a certain frequency range

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

three different spread-spectrum broadcasting methods

A

DSSS - direct-sequence spread-spectrum
FHSS - frequency-hopping spread-spectrum
OFDM - orthogonal frequency-division multiplexing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Wi-Fi Channels

A

14 channels, 20-MHz each on 2.4 GHz

40 channels with automatic channel switching on 5 GHz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Collision detection on wired vs wireless

A

wired - CSMA/CD

wireless - CSMA/CA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

collisions on wireless

A

each sending node detects the collision and responds by generating a random timeout period for itself called a backoff

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

DCF

A

Distributed Coordination Function

  • method for collision avoidance on Wireless
  • Defines backoffs
  • requires receiving nodes send an ACK for every frame they process
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

goodput

A

the acutal number of useful bits per second on a wireless network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

802.11b

A
  • first standard
  • 11 Mbps
  • 300 ft
  • 2.4 GHz
  • DSSS spectrum
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

802.11a

A
  • 54 Mbps
  • 150 ft
  • 5.0 GHz
  • OFDM spectrum
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

802.11g

A
  • 54 Mbps
  • 300 ft
  • 2.4 GHz
  • OFDM spectrum
  • backwards compatible with 802.11b
  • if only g devices connected, runs in Native Mode 54 Mbps
  • if b devices are connected, runs in Mixed Mode at 11 Mbps
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

802.11n

A
  • 100+ Mbps
  • 300 ft
  • 2.4 Ghz
  • OFDM (QAM) spectrum quadruple-amplitude modulated
  • MIMO (requires multiple antennas)
  • employs tranmit beamforming (helps get rid of deadspots)
  • backwards compatible with b/g
  • legacy mode - sends out separate packets just for legacy devices
  • mixed mode - same as legacy, but wide bandwidth
  • greenfield mode - n mode only
23
Q

802.11g-ht

A

means it is connecting to a 802.11n WAP in mixed mode

24
Q

802.11ac

A
  • 1 Gbps
  • 3000 ft
  • 5.0 GHz
  • OFDM (QAM) quadruple-amplitude modulated
  • MU-MIMO (multi-user)
25
Q

WPS

A

Wi-Fi Proctected Setup

  • push button or PIN
  • very susceptible to attack
26
Q

802.11i

A

security standard that enables you to set up a network with a RADIUS server and passwords encrypted with Extensible Authentication Protocol (EAP)

27
Q

RADIUS server

A
  • stores usernames and passwords to store user’s rights on a network
28
Q

supplicant

A

wireless client computer contacts a WAP, called a Network Access Server (NAS), requesting access to a network through a RADIUS server

29
Q

EAP

A
  • developed to create a single standard to allow to devices to authenticate
  • not a protocol, but a PPP wrapper that EAP-compliant applications can use to accept one of many types of authentication
  • used in wireless networks
30
Q

EAP-PSK

A

Pre-shared Key

  • most popular form of wireless authentication
  • a shared secret code that stored on both wireless AP and client
  • encrypted using AES
31
Q

EAP-TLS

A

EAP with Transport Layer Security

  • defines use of RADIUS server as well as mutual authenticaion
  • requires certificates on both server and every client
32
Q

EAP-TTLS

A

Tunneled TLS

  • similar to EAP-TLS but only uses a single server-side certificate
  • very common for more secure wireless networks
33
Q

EAP-MS-CHAPv2

A
  • uses a password function based on MS-CHAPv2 with the addition of an ecrypted TLS tunnel
  • also called Protected EAP (PEAP)
34
Q

EAP-MD5

A
  • simple version of EAP that only uses MD5 hashes for transfer of authentication credentials
  • weak, least used version
35
Q

LEAP

A

Lightweight EAP

  • Cisco
  • combiation of MS-CHAP and RADIUS server
36
Q

EAP-FAST

A

EAP Flexible Authenticaion vioa Secure Tunneling

  • Cisco’s replacement for LEAP
  • supported by all modern OSs
37
Q

802.1X

A
  • Ethernet version of EAP
  • does not use PPP
  • puts EAP inside an ethernet frame
  • port based authenticaion
  • combines RADIUS-style AAA with EAP
38
Q

WEP

A

Wired Equivalent Privacy

  • uses a 64 or 128 bit encryption algorithm to scramble data frames
  • easily cracked
39
Q

WPA

A

Wi-Fi Protected Access

  • adpoted most of the 802.11i standard
  • dynamic encryption key generation
  • adds extra layer of secruity called TKIP (temporal key integrity protocol)
  • easily cracked
40
Q

CCMP

A

Counter Mode Block Chaining Message Authentication Code Protocol

41
Q

WPA2

A

Wi-Fi Protected Access 2

  • fully supports 802.11i
  • most common is WPA2-PSK
  • use long passphrases to prevent hacking
42
Q

5 differences between SOHO and enterprise

A 
robust device contruction
centralized management
VLAN pooling
Power over Ethernet
bringing personal wireless devices into the enterprise environment
43
Q

Wireless Controller

A

A switch designed to handle a number of WAPs simultaneously

44
Q

Difference between WAP thin and thick client

A

Thick - can access the device directly

Thin - can only be configued by a wireless controller

45
Q

LWAPP

A

Lightweight Access Point Protocol

- standard protocol used for WAP configuration

46
Q

VLAN pooling

A

randomly assign wireless clients to a VLAN

47
Q

Power over Ethernet

A

802.3af

outputs up to 25.5 watts

48
Q

site survery

A

will reveal any obstacles to creating the wireless network and will help determine the best possible location for your access points

49
Q

Wi-Fi Analyzer

A

a device that looks for and documents all existing wireless networks in the area

50
Q

High Device Density Environments

A

an area with a lot of wireless devices

51
Q

Four things needed to configure a NIC for ad hoc mode?

A

SSID
IP Address
Channel
Sharing

52
Q

Three types of antennas

A

Omnidirectional
Unidirectional
Patch

53
Q

Omnidirectional Antenna

A
  • radiates the signal outward in all directions

- straight wire omnidirectionals are called dipole antennas

54
Q

gain

A
  • the ratio of increase from a strenghtened antenna signal
  • measured in dB
  • typical WAP is 2 dB
  • increasing the signal requires a bigger antenna (up to 11)

CompTIA - Network+ (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions