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CTA-19238 (Do not use - Wrong info) > Wi-fi > Flashcards

Wi-fi Flashcards

1
Q

What are the two means by which Wi-fi is transmitted

A

Radio waves

Infrared light

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2
Q

What is the IEEE standard for Wifi?

A

802.11

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3
Q

What is a wap

A

Wireless access point - Essentially, a wi-fi version of a switch

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4
Q

By what means does a wap get its power and ethernet over one cable?

A

Power over ethernet

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5
Q

How can one extend the range of their poe cable?

A

PoE injectors

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6
Q

How does wi-fi Carrier Sense Collision detection work?

A

Node wanting to transmit data listens on the network for any data being broadcast. If it is, it’ll wait a random amount of time before trying again.

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7
Q

How does RTS/CTS work?

A

Request to send - Clear to Send works by the node wanting to transmit data sending a special packet (Request to send) to the recipient. When the recipient is ready for data it will send a “Clear to send” packet back to the sender. The sender then sends the data, and the receiver sends ack packets to confirm they got it.

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8
Q

What is ad hoc

A

Connecting directly to other machines - No wap or router

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9
Q

What does IBSS mean and imply

A

Independent Basic Service Set implies ad hoc mode.

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10
Q

What does EBSS imply

A

A wireless network with multiple waps

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11
Q

What does BSS imply

A

A wireless network with one WAP

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12
Q

How does a WMN work

A

Wireless Mesh Networks work by having nodes all act like routers, where they forward each other’s packets and all nodes connect to one another.

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13
Q

What are three WAP security methods

A

Encryption
MAC filtering
authentication

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14
Q

Is MAC filtering an airtight security method?

A

No, legit MACS can be sniffed out and spoofed.

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15
Q

What does WEP stand for and what is one of its traits

A

Wired Equivalent privacy uses the same key for every device on the network

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16
Q

What does WPA stand for and what are one of its traits.

A

Wifi Protected Access uses TKIP (temporal key integrity protocol)

17
Q

What is TKIP

A

Temporal Key integrity standard changes the key for every packet exchanged

18
Q

Which WPA version uses AES?

A

WPA2

19
Q

What is WPS

A

Wifi Protected setup. Press a button to sync your device and router together into a connection. Has many vulnerabilities including a shit password.

20
Q

How do you use an adhoc wifi network?

A

Change to it in your adapter settings and have all CPUs use the same SSID with no conflicting IPs.

21
Q

What is gain

A

The strength an antenna adds to a WAPS signal

22
Q

What is polarization

A

The direction the radio waves move depending on the angle of the antenna.

23
Q

What is the suggested angle for an antenna

A

45 degrees

24
Q

What is the act of using your phone as a wap?

A

Hotspot

25
Q

Name three things that block signals

A

Fridge, microwave, metal plumbing.

26
Q

What is roaming?

A

Connecting to a new wap once you leave the signal of a previous one.

27
Q

What ghz and speed is 802.11a

A

5.0ghz, 54 mbps.

28
Q

802.11b

A

2.4ghz, 11mbps

29
Q

802.11g

A

2.4ghz 54 mbps

30
Q

802.11n

A

both, 100 mbps

31
Q

802.11ac

A

5 (can be both), gigabit

32
Q

What are the three things to ask yourself when facing a troubleshooting wifi?

A

Who is affected. Single case or multiple nodes?
What is the nature of the problem. No connection? Intermittent connection?
When did this happen?

33
Q

How could you try to fix a weak wifi signal

A

Move closer
Adjust/swap antenna
Move from crowded channel

34
Q

What can you consult to check the quality of wifi connection

A

Strength bar, link lights on nic.

35
Q

Someone is unable to connect to a wap after typing in the SSID and password. What’s the most likely issue?

A

SSID is typed wrong

CTA-19238 (Do not use - Wrong info) (23 decks)

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