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CompTIA A+ 220-1101 > Wireless and SOHO Networks (Chapter 7) > Flashcards

Wireless and SOHO Networks (Chapter 7) Flashcards

1
Q

Why are wireless standards 802.11a and b incompatible?

A

They use different modulation and operate in different frequencies (a: 5Ghz, b: 2.4Ghz)

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2
Q

What does it mean if a device is labeled with ā€œ802.11b/gā€?

A

The device can operate with both standards.

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3
Q

Which of the older standards commonly conflicts with other devices on the same frequency?

A

802.11b
Operates in 2.4Ghz, conflicts with microwaves, Bluetooth

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4
Q

What kind of collision handling does 802.11 use?

A

CSMA/CA

Collision avoidance.

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5
Q

Which standards operate in both 2.4 and 5Ghz?

A

802.11n (for new improvements from previous standards!)
and 802.11ax

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6
Q

Up to what speed can 802.11n provide?

A

600Mbps

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7
Q

Which two older standards are compatible with each other?

A

802.12b/g

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8
Q

How many channels are available for use in the 2.4Ghz range?

A

11

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9
Q

Which standard is known as WiFi 5?

A

802.11ac, released in 2014

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10
Q

Which standard is known as WiFi 6?

A

802.11ax, released in 2019

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11
Q

Up to what speeds can 802.11ac provide?

A

7Gbps, a massive increase from 600Mbps with n

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12
Q

What is one of the most important new features of 802.12ac?

A

Beamforming, which sends the signal in a specific direction toward the client
DOES NOT INCREASE THROUGHPUT, just range

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13
Q

Which of the three newer standards operates on only 5Ghz?

A

802.11ac

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14
Q

Which wireless standard provides the most distance?

A

802.11n (250m)

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15
Q

What standard and frequency does BT operate on?

A

802.15 (2.4Ghz)

Same as Zigbee

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16
Q

What does a WAP do?

A

Adds wireless connections to an Ethernet network

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17
Q

If you have overlapping WAPs what do you need to do?

A

Use nonoverlapping channels to avoid communications problems. These channels are 1, 6 and 11.

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18
Q

What is long-range fixed wireless?

A

Point-to-point technology using directional antennas to send and receive. The sending and receiving devices need to be pointed at each other. Obstructions can interfere.

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19
Q

Can you get power from long-ranged fixed wireless?

A

Yes (a.k.a. WPT, wireless power transfer). Itā€™s the same concept of PoE except itā€™s sent with microwaves or light. The receiving station converts it into electricity.

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20
Q

What technology is a subset of RFID and what is its distance like?

A

NFC
Very short distance
Used in contactless payments

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21
Q

Do cable and DSL use the same source for internet?

A

No. DSL uses telephone lines and cable uses cable TV lines

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22
Q

Is DSL or cable faster?

A

Cable, though the ISP can throttle download speeds with both since you share bandwidth with other customers.

23
Q

What is channel bonding?

A

Combining two adjacent wireless channels to create a single, wider channel. This increases bandwidth and can improve data throughput in Wi-Fi networks.

24
Q

Which standards support channel bonding?

A

All three newer standards (802.11n, ac, and ax)

25
Q

What WiFi standard introduced DFS?

A

802.11n uses Dynamic Frequency Selection to detect radar interference and adjust frequencies accordingly.

26
Q

What will happen if a 802.11b device connects to a 802.11g router running in mixed mode?

A

All connected devices will receive a speed of 11 Mbps as the router switches to accommodate.

27
Q

What is the list of rules on a firewall called?

A

ACL (access control list)

28
Q

Frequency and speed of 802.11a

A

5 Ghz
54 Mbps

29
Q

Frequency and speed of 802.11b

A

2.4 Ghz
11 Mbps

30
Q

Frequency and speed of 802.11g

A

2.4 Ghz
54 Mbps

31
Q

Speed and frequency of 802.11n

A

2.4 Ghz + 5 Ghz
600 Mbps

32
Q

Frequency and speed of 802.11ac

A

5 Ghz
7 Gbps

Big jump from 600Mbps (n)

33
Q

Frequency and speed of 802.11ax

A

2.4 Ghz + 5 Ghz
10 Gbps

34
Q

What is WPA? Whats the weakest?

A

Wifi protected access
WEP is the weakest, next is WPA

35
Q

What is MIMO and what standards support it?

A

Using multiple antennas to transmit more data at once
802.11n

36
Q

Which standards support MU-MIMO?

A

802.11ac and ax

37
Q

Which standard has a new sleep feature that lowers power usage?

A

Wifi 6 (ax)

38
Q

What did 2G consist of?

A

2 global standards:
CDMA and GSM (not converged)

Good for voice, but very bad for sending data

39
Q

What features did 3G introduce?

A

GPS, mobile TV and streaming video and audio (video on demand)

40
Q

After 3G, what was the significance of LTE (4G)?

A

It was a converged standard. Companies that used to be GSM or CDMA can now used one standard (LTE) for sending data over a wireless network.

41
Q

What does 5G provide over the other generations?

A

Greatly enhanced speeds. Some 5G networks can perform at around 10 gigabits per second.

42
Q

What is mobile PRL?

A

Preferred Roaming List
Allows your phone to understand where the appropriate towers are for the network that it happens to be using

Used with CDMA

43
Q

How are PRL updates performed?

A

OTA (over the air)

44
Q

Which standard was more globally accepted and allowed for SIM card transfer?

A

GSM (Global System for Mobile Communications)

This was AT&T, T-Mobile

45
Q

How did GSM allow multiple people to communicate over the same frequency?

A

Multiplexing

46
Q

How did CDMA allow multiple users to communicate at the same time?

A

Code division
Each person used a unique code that was used to filter out irrelevant codes

Verizon and Sprint

47
Q

What download rates did LTE (4G) support?

A

150 Mbps

48
Q

What is LTE-A and what does it provide?

A

LTE-Advanced
Increase speeds from 150 to 300 Mbps

49
Q

What is WISP?

A

Wireless internet service provider

50
Q

What delivery method does WISP use?

A

Fixed point-to-point broadband internet

Might use a dish or antenna

51
Q
A
52
Q

What is the most important device in a SOHO network and what functionalities does it have?

A

The SOHO router
Contains connections for ethernet, wifi, firewall and telephone
Usually have a switch built in as well

Is probably DSL

53
Q
A

CompTIA A+ 220-1101 (11 decks)

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