CompTIA Network+ > Wireless Networks > Flashcards

Wireless Networks Flashcards

(25 cards)

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1
Q

What are the 3 non overlapping channels in the 2.4Ghz Band and how wide in Mhz is a channel?

A

Channels 1, 6 and 11.
Channel width: 20-22Mhz

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2
Q

How many channels exist in 2.4GHz?

A

NA: 1 - 11
Rest of the world: 1- 13
Japan: 1 -14

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3
Q

How many non overlapping channels does the 5Ghz Band has and how wide is each channel?

A

24 Channels with a width of 20Mhz

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4
Q

How many non overlapping channels does the 6Ghz Band has and how wide is each channel?

A

Maximum of 59 channels at 20Mhz width. The Channel width can be 20, 40, 80 or 160 Mhz tho. 7 Channels at 160Mhz

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5
Q

What are the benefits and tradeoffs for 2.4, 5 and 6Ghz?

A

2.4Ghz: Biggest distance and best solid object penetration but slowest speed.
5Ghz: Faster speeds but less distance and penetration
6Ghz: Fastest speeds but shortest distance and worst penetration

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6
Q

What is the frequency band, speed and distance of 802.11a?

A

Frequency Band: 5Ghz
Speed: 54Mbps
Distance: 35m

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7
Q

What is the frequency band, speed and distance of 802.11b?

A

Frequency Band: 2.4Ghz
Speed: 11Mbps
Distance: 140m

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8
Q

What is the frequency band, speed and distance of 802.11n (WiFi 4)?

A

Frequency Band: 2.4, 5Ghz
Speed: 600Mbps
Distance: 35m
Using MIMO

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9
Q

What is the frequency band, speed and distance of 802.11g?

A

Frequency Band: 2.4Ghz
Speed: 54Mbps
Distance: 140m

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10
Q

What is the frequency band, speed and distance of 802.11ac?

A

Frequency Band: 5Ghz
Speed: 6.9Gbps
Distance: 35m
Using MU-MIMO

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11
Q

What is the frequency band, speed and distance of 802.11ax (WiFi 6/6e)?

A

Frequency Band: 2.4, 5, 6Ghz
Speed: 9.6Gbps
Distance: 35m
Using MU-MIMO

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12
Q

Why is a PSK not suited for enterprise environments and whats used for authentication instead?

A
  • Poor security as too many people know the PSK to keep it secret
  • No individual user accountability
    Instead 802.1X authentication with user/pass or a certificate is used
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13
Q

Why is the WEP standard so unsecure?

A

Because of the Initialization Vector Vulnerability, that allowed attackers to intercept those vectors through an on pass attack and guess the password if they had intercepted enough.

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14
Q

What is an open network?

A

A network with no protection at all.

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15
Q

Why is WPA that replaced WEP unsecure aswell?

A

The TKIP mechanism that replaced the Initialization Vectors was still vulnerable and the RC4 encryption wasnt secure.

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16
Q

What makes WPA2 more secure?

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A

The use of CCMP as integrity mechanism and AES as enryption.

17
Q

Why is WPS unsecure even tho its 8 digit pin should be resilient to brute force?

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A

The key is checked in two parts of 4 digits, which brings the possible number of combinations down to 20.000.

18
Q

What is enterprise mode?

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A

In Enterprise Mode an Access Point uses individual user/pass for auth instead of a PSK.

19
Q

What is SAE? Why is it more secure and when was it intoduced?

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A

Simultaneous Authentication of Equals is a protcol that improves the WPA handshale process which provides a more secure initial key exchange through the dragon fly key exchange. It was introduced with WPA3

20
Q

What security options should be set when setting up a router?

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A
  • Disabling SSID Broadcast
  • Enable Wireless Isolation
  • At least WPA2, WPA3 if available
  • Disable WPS
21
Q

What technology allows an access point to use multiple antennas to send and receive data at faster speeds?

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A

Multiple Input Multiple Output (MIMO)

22
Q

What types of antennas exist?

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A

Omnidirectional Antennas
Unidirectional Antennas
Yagi Antennas (specific type of Unidirecitonal Antenna)

23
Q

What is an AdHoc network?

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A

A network where devices connect directly to each other without an access point or centralized management.

24
Q

What is a BSSID and an SSID

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A

The MAC address of the access point and the name of the access point.

25
What is a point to point wireless network?
It connects to locations over longer distances using antennas. Like two office buildings.
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