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CompTIA A+ > Wireless Networking > Flashcards

Wireless Networking Flashcards

1
Q

What is MIMO?

A

Multiple Input and Multiple Output transmission

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2
Q

Local Wireless Technology: RF

A

A generic term rather than a standard, used to apply to any number of proprietary radio frequency protocols.

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3
Q

Local Wireless Technology: RFID

A

Radio frequency identification is a technology which allows identification and communication between nodes using electromagnetic fields.

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4
Q

Local Wireless Technology: Bluetooth

A

Bluetooth operates in the same 2.4 GHz RF band used by Wi-Fi, and in fact, many Wi-Fi NICs include Bluetooth transceivers, but it’s a separate standard.

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5
Q

Local Wireless Technology: NFC

A

Near Field Communication is a set of standards based on RFID, and commonly found on mobile devices such as smartphones.

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6
Q

Local Wireless Technology: ANT+

A

A 2.4 GHz radio protocol similar to but separate from Bluetooth. It is a proprietary format owned by Garmin, but is available for other vendors by an open access agreement.

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7
Q

Local Wireless Technology: Z-WAVE

A

A proprietary wireless standard maintained by Silicon Labs. It uses the 800-900 MHz ISM band, with precise frequencies varying by country.

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8
Q

Local Wireless Technology: ZigBee

A

An open standard based on the IEEE 802.15.4 PAN standards, maintained by the ZigBee Alliance. It can use a variety of ISM bands, with 2.4 GHz and 915 MHz bands being the most common.

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9
Q

How could you tell if a wireless device used MIMO?

A

It might have multiple visible antennas.

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10
Q

What happens if two wireless networks use overlapping spread spectrum channels?

A

Since only some subchannels will experience interference at a given time, both networks will still work at a reduced data rate.

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11
Q

MIMO uses multiple antennas to simultaneously transmit and receive separate data streams on the same channel. True or False?

A

True

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12
Q

Radio frequency identification (RFID) is a technology which allows identification and communication between nodes using electromagnetic fields. True or False?

A

True

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13
Q

What wireless communication protocol is used primarily for home automation?

A

Z-Wave

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14
Q

Band and Speed: 802.11a

A

Supports speeds of up to 54Mbps on the 5 GHz band.

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15
Q

Band and Speed: 802.11b

A

Supports speeds of up to 11Mbps on the 2.4GHz band.

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16
Q

Band and Speed: 802.11g

A

Supports speeds up to 54MBps over the 2.4 GHz band.

17
Q

Band and Speed: 802.11n

A

Supports speeds up to 600 Mbps over either the 2.4 GHz or 5 GHz band, if all 4 spatial streams are used.

18
Q

Band and Speed: 802.11ac

A

Supports speeds of up to 6.93 Gbps in the 5GHz band using ODFM encoding, if all 8 spatial streams are used.

19
Q

You’re setting up a Wi-Fi network for local sharing without internet access. Why would you still use a WAP rather than an ad-hoc network?

A

Infrastructure mode is generally more efficient and gives better performance.

20
Q

Wi-Fi encryption standards: WEP

A

Wired Equivalent Privacy was part of the original Wi-Fi standard. It uses the RC4 encryption cipher, and it soon turned out to have some major problems.

21
Q

Wi-Fi encryption standards: WPA

A

Wi-Fi Protected Access was included as part of the draft 802.11i standard, rushed a bit into service when WEP’s critical limitations became obvious.

22
Q

Wi-Fi encryption standards: WPA2

A

WPA2 is the final version of WPA, based on the final 802.11i standard. It has a few changes, but the biggest one is mandatory support for 128-bit encryption using the strong and well-regarded Advanced Encryption Standard(AES) cipher.

23
Q

WPA options: WPA-Personal

A

Also called pre-shared key (PSK). Uses a passphrase of between 8 and 63 ASCII characters, manually distributed to each authorized user.

24
Q

WPA options: WPA-Enterprise

A

Also known as 802.1x mode. Connecting clients are only allowed to communicate to an external authentication server, usually RADIUS-based, with a username and password.

25
Q

WPA options: WPS

A

Wi-Fi Protected Setup was designed to make it easy for non-technical users of home networks to easily control network access. It’s an addition to PSK mode, but also allows the key to be shared with a new device by other methods like a PIN, a push-button pairing mechanism, or NFC pairing.

26
Q

CCMP

A

Counter Mode Cipher Block Chaining Message Authentication Code Protocol

27
Q

AES

A

Advanced Encryption Standard

28
Q

Why is it easier to compromise and harder to maintain WPA-Personal vs WPA-Enterprise, even when they use the same key length?

A

WPA-Personal uses the same shared key for everyone on the network. That makes it easier for unauthorized people to learn it and join unnoticed, and harder for administrators to change the password without affecting everyone.

29
Q

Which Wi-Fi standard can operate in either the 2.4 GHz or 5 GHz band?

A

802.11n

30
Q

Which Wi-Fi standard operates at 2.4 GHz frequency and provides data transmission of up to 54 Mbps?

A

802.11g

31
Q

802.11ac supports the speed up to 10 Gbps in the 2.4GHz band using OFDM encoding, if all 8 spatial streams are used. True or False?

A

False

32
Q

What technology supports throughput up to 40 kbps over distances of 10-100 m?

A

Z-Wave

33
Q

What technology uses a variety of ISM bands, with 2.4 GHz and 915 MHz bands being the most common?

A

ZigBee

34
Q

What wireless technology allows identification and communication between nodes using electromagnetic fields?

A

Radio frequency identification

35
Q

What Wi-Fi standard supports speeds up to 54 Mbps over the 2.4 GHz band?

A

802.11g

36
Q

Which WPA option is also called pre-shared key (PSK)?

A

WPA-Personal

37
Q

Which WPA option is also known as 802.1x mode?

A

WPA-Enterprise

38
Q

Which Wi-Fi encryption standard encrypts traffic using Temporal Key Integrity Protocol (TKIP)?

A

WPA

CompTIA A+ (24 decks)

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