Wireless and SOHO Networks (Chapter 7) Flashcards
Why are wireless standards 802.11a and b incompatible?
They use different modulation and operate in different frequencies (a: 5Ghz, b: 2.4Ghz)
What does it mean if a device is labeled with “802.11b/g”?
The device can operate with both standards.
Which of the older standards commonly conflicts with other devices on the same frequency?
802.11b
Operates in 2.4Ghz, conflicts with microwaves, Bluetooth
What kind of collision handling does 802.11 use?
CSMA/CA
Collision avoidance.
Which standards operate in both 2.4 and 5Ghz?
802.11n (for new improvements from previous standards!)
and 802.11ax
Up to what speed can 802.11n provide?
600Mbps
Which two older standards are compatible with each other?
802.12b/g
How many channels are available for use in the 2.4Ghz range?
11
Which standard is known as WiFi 5?
802.11ac, released in 2014
Which standard is known as WiFi 6?
802.11ax, released in 2019
Up to what speeds can 802.11ac provide?
7Gbps, a massive increase from 600Mbps with n
What is one of the most important new features of 802.12ac?
Beamforming, which sends the signal in a specific direction toward the client
DOES NOT INCREASE THROUGHPUT, just range
Which of the three newer standards operates on only 5Ghz?
802.11ac
Which wireless standard provides the most distance?
802.11n (250m)
What standard and frequency does BT operate on?
802.15 (2.4Ghz)
Same as Zigbee
What does a WAP do?
Adds wireless connections to an Ethernet network
If you have overlapping WAPs what do you need to do?
Use nonoverlapping channels to avoid communications problems. These channels are 1, 6 and 11.
What is long-range fixed wireless?
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.
Can you get power from long-ranged fixed wireless?
Yes (a.k.a. WPT, wireless power transfer). It’s the same concept of PoE except it’s sent with microwaves or light. The receiving station converts it into electricity.
What technology is a subset of RFID and what is its distance like?
NFC
Very short distance
Used in contactless payments
Do cable and DSL use the same source for internet?
No. DSL uses telephone lines and cable uses cable TV lines
Is DSL or cable faster?
Cable, though the ISP can throttle download speeds with both since you share bandwidth with other customers.
What is channel bonding?
Combining two adjacent wireless channels to create a single, wider channel. This increases bandwidth and can improve data throughput in Wi-Fi networks.
Which standards support channel bonding?
All three newer standards (802.11n, ac, and ax)
