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CompTIA Network+ > Wireless Networks > Flashcards

Wireless Networks Flashcards

1
Q

wap

A

Wireless Access Point
Expands wired LAN into the wireless domain
All clients on an access point are on a single collision domain

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2
Q

(IBSS)

A

Independent Basic Service Set

contains only devices/clients with no access point (ad hoc)

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3
Q

(BSS)

A

Basic Service Set
only one access point connected to the network
ex: small office/home office

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4
Q

(ESS)

A

Extended Service Set
contains multiple access points to provide coverage
ex: college

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5
Q

Wireless Mesh Topology

A

May not use a centralized control

Range of combined wireless tech: WiFi, Microwave, Cellular etc …

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6
Q

Access Point Placement

A

Careful planning is required to prevent the APs from interfering with one another and still maintaining the desired coverage area
Coverage should overlap between APs to allow uninterrupted roaming from one
cell to another but can’t use overlapping frequencies

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7
Q

AP Placement (2.4 Ghz)

A

Non-overlapping coverage cells for 2.4 GHz band should have 10% to 15% coverage overlap in
coverage area

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8
Q

AP Placement (5 Ghz)

A

Identical channels should be separated by at least two cells instead of
one

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9
Q

Site Surveys

A

Wireless survey to determine coverage areas

Produces a heat map with coverage

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10
Q

Omnidirectional Antenna

A

radiates power equally all directions

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11
Q

Unidirectional Antenna

A

focuses power in one direction for covering greater distances
ex: yagi

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12
Q

Spread Spectrum Wireless Transmissions

A

Direct-Sequence Spread Spectrum (DSSS)

Orthogonal Frequency-Division Multiplexing (OFDM)

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13
Q

Frequencies and Channels

A

2.4 GHz band: Channels 1, 6, and 11 will avoid overlapping frequencies in 2.4 GHz band
5 GHz band: channel bonding

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14
Q

Channel Bonding

A

Allows you to create a wider channel by merging neighboring channels
into one
make channel size larger, increase speed, increase interferance

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15
Q

802.11

A

band: 2.4 GHz
bandwidth: 1-2 Mbps

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16
Q

802.11a

A

band: 5 GHz
bandwidth: 54 Mbps

17
Q

802.11b

A

band: 2.4 GHz
bandwidth: 11 Mbps

18
Q

802.11g

A

band: 2.4 GHz
bandwidth: 54 Mbps

19
Q

802.11n

A

band: 2.4 and 5 GHz
bandwidth: >300Mbps
MIMO, channel bonding

20
Q

802.11ac

A

band: 5 GHz
bandwidth: 3 Gbps
MU-MIMO

21
Q

802.11ax

A

band: 2.4 5, 6GHz
bandwidth: 9.6 Gbps
MU-MIMO

22
Q

MIMO

A

multiple antennas to receive/send more data

23
Q

(RFI)

A

Radio Frequency Interference
Caused by using similar frequencies to WLAN
Other wifi devices (overlapping channels)

24
Q

Pre-Shared Key

A

Both AP and client uses same encryption key
bad:
Scalability is difficult if key is compromised
All clients must know the same password

25
Q

wep

A

Wired Equivalent Privacy
weak
Uses 24-bit Initialization Vector (IV) sent in clear
Brute Force Attack within minutes using AirCrack-ng and other tools

26
Q

open

A

no security

27
Q

(WPA)

A

Wi-Fi Protected Access
weak
TKIP used for 48bit IV
RC4 used for encryption

28
Q

(WPA2)

A

Wi-Fi Protected Access 2
strong and modern
CCMP for integrity checks
AES for encryption

29
Q

802.1x

A

network authentications

wlan: Each wireless user authenticates with their own credentials

30
Q

(EAP)

A

Extensible Authentication Protocol
Authentication performed using 802.1x
EAP-FAST, EAP-MD5, EAP-TLS

31
Q

(NAC)

A

Network Admission Control
Permits or denies access to the network based on characteristics of the
device OS, anti virus

32
Q

Captive Portals

A

Web page that appears before the user is able to access the network
resources

33
Q

Geofencing

A

GPS or RFID defines real-world boundaries
Device can send alerts if it leaves area
Network authentication can use it to determine access

34
Q

Disable SSID Broadcast

A

Configures an AP to not broadcast the name of the wireless LAN
but, Knowledgeable users can still easily find the SSID using wireless
sniffing tools

35
Q

Rogue Access Point

A

Malicious users set up an AP to lure legitimate users to connect to the AP
then capture all the packets (data)

36
Q

Unsecured Wireless Networks

A

War Driving: Occurs when users perform reconnaissance looking for unsecured wireless networks
War Chalking: Occurs when users write symbols on a wall to notify others of AP characteristics

CompTIA Network+ (22 decks)

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