2.4 Compare and contrast wireless networking protocols. Flashcards
The five wireless 802.11 standards are:
- 11a
- 11b
- 11g
- 11n
- 11ac
MIMO stands for what, and means what?
Multiple-input multiple-output. It means you able to send many streams of traffic across the same frequencies without conflict.
What wireless standards use MIMO, and what effect did it have?
802.11n, 802.11ac. It increased their bandwidth significantly.
Which of the 5 standards can operate at only 2.4Ghz?
802.11b 802.11g
Which of the 5 standards can operate at only 5Ghz?
802.11ac, 802.11a
Which of the 5 standards can operate at both 2.4Ghz and 5Ghz?
802.11n
You are able to get throughputs with 802.11n up to a theoretical maximum of ___.
600 megabits-per-second
The ___ range has a much larger set of available frequencies, so we’re able to bond channels together and get higher throughputs.
5 gigahertz
How many MIMO streams does 802.11n have?
4
How many MIMO streams does 802.11ac have?
8
What is the maximum thoroughput for a single MIMO stream?
150-megabits per second
You are able to get throughputs with 802.11ac up to a theoretical maximum of ___.
almost 7 gigabits-per-second
Bluetooth can be used for
tethering, file transfer, high speed communication, etc (over short distances.)
RFID stands for what? What does it do?
Radio Frequency Identification. A wireless technology use for tracking tagged things.
A popular wireless technology that we find in access badges, in our animal identification technologies, or really anything that we might need to be tracked is ___.
RFID
RFID tags work using ___ technology. This RF energy is sent out, captured by the tag, and is used to power the RFID tag. The tag then sends out an ID signal which then can be captured.
radar
You might also find RFID tags that are already powered. Those are ___ RFID tags.
active
An advanced form of RFID is one that we put into many of our mobile phones. This is ___.
Near Field Communication or NFC
We can use ___ to help with the pairing process with Bluetooth, or it can act as an identity card to prove that you are who you say you are or give you access to a locked room.
NFC
Zigbee is a 802.15.4 PAN that is worth considering over Bluetooth and wifi because?
It uses less power than Wi-Fi and can go longer distances than a Bluetooth connection.
Unlike 802.11, which has a central access point, and all devices have to be able to communicate to that access point, Zigbee is a ___.
meshed network
Meshed networks have what feature?
Each node in the network can route data allowing it to expand rapidly.
Zigbee communicates over the ___.
ISM ban (Industrial, Scientific and Medical band),
Zigbee uses what frequency?
2.4Ghz
What two wireless network communications are used for meshed topologies often seen in IoT devices?
Zigbee, and Z-Wave; both use 900 megahertz and 2.4 gigahertz frequencies
___ cell networks were built with voice communication in mind. They were built so that you could make phone calls. And the idea of sending data over this network was not part of the original engineering.
2G
___ cell networks really changed how we started to use our mobile devices, because this increased bandwidth meant that we could have different types of applications; GPS technologies and have video on demand and use much more data.
3G
With 4G technology, we began to consolidate the type of wireless networking that we were doing over mobile networks. Most of this consolidation consisted of ___ networking.
LTE, or Long Term Evolution,
LTE stands for what? Means what?
Long Term Evolution.
The LTE standard supported download rates of ___ megabits. And an improvement to LTE called LTE Advance doubled that to ___ megabits per second.
150
300
5G technologies will be able to use much higher ___. And if you’re using those ___, you could see some significant performance improvements.
frequencies
___ not only increase the number of frequencies available but has some significant improvement in the data throughput as well.
5G
