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Network + > WLAN > Flashcards

WLAN Flashcards

1
Q

WLAN

A

Wireless Networking

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2
Q

Ad Hoc wireless

A

Devices communicate with each other

No need for centralized AP

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3
Q

Infrastructure wireless

A

Communicate through router or access point

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4
Q

WAP

A

Wireless Access Point
Expands wired LAN into wireless domain
Single collision domain

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5
Q

IBSS

A

Independent Basic Service Set

Ad Hoc wirless

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6
Q

BSS

A

Basic Service Set
Infrastructure wireless
One AP connected to internet

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7
Q

ESS

A

Extended Service Set
Infrastructure wireless
Multiple APs connected to internet

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8
Q

2.4Ghz overlap

A

Cannot overlap on same frequency

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9
Q

5.0Ghz overlap

A

Same channels should be separated by at least 2 cells instead of 1

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10
Q

Omnidirectional antenna

A

Radiates power equally in all directions

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11
Q

Unidirectional antenna

A

focusses power in one direction for greater distances

Yagi antenna

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12
Q

DSSS

A

Direct Sequence Spread Spectrum
Series of signals known as chips
High environmental interference
Uses entire frequency spectrum to transmit

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13
Q

FHSS

A

Frequency Hopping Spread Spectrum
Devices hop between predetermined frequencies
Increases security
Hops occur on predetermined timer

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14
Q

OFDM

A

Orthogonal Frequency Division Multiplexing
Slow modulation rate with simultaneous transmission over 52 data streams
Allows for higher data rates while resisting interference between streams

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15
Q

2.4GHz channels

A

1, 6, 11

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16
Q

802.11

A 
2.4
1 or 2 Mbps
DSSS or FHSS
20m in
100m out
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17
Q

802.11a

A 
5
54Mbps
OFDM
35m in
120m out
18
Q

802.11b

A 
2.4
11 Mbps
DSSS
32m in
140m out
19
Q

802.11g

A 
2.4
54 Mbps
OFDM or DSSS
70m in
250m out
20
Q

802.11n

A 
2.4 and 5
>300 Mbps
OFDM
70m in
250m out
21
Q

802.11ac

A 
5
>3Gbps
OFDM
70m in
250m out
22
Q

RFI

A

Radio Frequency Interference

Caused by similar frequencies to WLAN

23
Q

CSMA/CA

A

Carrier Sense Multiple Access/Collision Avoidance
Controls access to medium
Listens for transmission to determine if safe to transmit
-If channel is clear, transmit Request to Send (RTS)
-Waits for acknowledgement
-If RTS received, respond with Clear to Send (CTS)
-If not received, device starts random back off timer

24
Q

Pre-shared key

A

AP and client use same encryption key

All clients must know the same password

25
Q

WEP

A 
Wire Equivalent Privacy
Original 802.11 security standard
Static 40 bit pre-shared key
Upgraded to 64 and 128 bit keys
24-bit initialization vector sent in clear text
Unsecure
26
Q

WPA

A

WiFi Protected Access
Replaced WEP
Follows Temporal Key Integrity Protocol (TKIP)
48 bit initialization vector
Rivest Cypher 4 (RC4) used for encryption
Message Integrity Check (MIC) (hashing)
Users required to authenticate before exchanging temporary keys

27
Q

WPA2

A

WiFI Protected Access 2
Cipher Clock Chaining Message Authentication Code Protocol (CCMP)
Advanced Encryption Standard (AES) - 128 bit key or above
Personal Mode - pre-shared keys
Enterprise Mode - Centralized authentication

28
Q

If asked about Open

A

No security

29
Q

If asked about WEP

A

IV

30
Q

If asked about WPA

A

TKIP and RC4

31
Q

If asked about WPA2

A

CCMP and AES

32
Q

802.1x

A

Network Authentication

Users authentication with their own credentials

33
Q

EAP

A 
Extensible Authentication Protocol
Authentication using 802.1x
EAP-FAST (Flexible Authentication via Secure Tunneling)
EAP-MD5
EAP-TLS
34
Q

MAC Address filtering

A

Configures AP with list of permitted MAC addresses

35
Q

NAC

A

Network Access Control
Permits or denies access to network based on characteristics of device
Does not use credentials

36
Q

Captive Portal

A

Page that appears before user is able to access network resources
Accepts credentials and presents them to authentication server

37
Q

Geofencing

A

GPS or RFID
Active or passive
Used to determine access/network authentication

38
Q

Disable SSID Broadcast

A

Configures AP to not broadcast name of WLAN

Easy to find

39
Q

Rogue Access Point

A

AP set up to lure users to connect

Can capture all packets through rogue AP

40
Q

War driving

A

Looking for unsecure wireless networks

41
Q

War chalking

A

Users write symbols on wall to notify others of AP characteristics

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