Wireless Networks Flashcards
(80 cards)
Ad Hoc
decentralized - peer to peer
IBSS
devices connect directly to each other rather than through a central access point
Doesn’t typically provide Internet access
Use: sharing files wirelessly to create a direct connction
Infrastructure Wireless Networks
more organized setup. Each wireless access point each has their own BSSID (Basic Service Set Identifier) set to the MAC address of the wireless access point
SSID - Service set identifier
common alphanumeric network name that end users can search for to connect to wireless network
Point-to-Point Wireless Network
connect 2 distinct locations over long distances
static nature, highly efficient
use: good to link buildings in a good location
EX: living in Puerto Rico, put an antenna pointed at tall building to get that wireless network
Wireless Mesh Network
each node in the network can connect with other nodes and create infinite paths for data to travel across
self-healing, reconfigure themselves, great for large-scale deployments when you can’t lay cables
EX: jason helping in diaster areas to create a huge wireless network (mesh network)
autonomous access point
a standalone device that contains all of intelligence to handle wireless networking functions independently
EX: home users use one access point for internet
Lightweight access points
multiple access points connected back to a centralized controller
wireless antenna
devices designed to send and receive radio frequency signals
Omnidirectional antennas
designed to transmit and receive wireless signals in all directions equally
In most devices
great for covering broad areas
default type of antenna for wireless access point, wireless public networks in coffee shops, hotels, etc
Unidirectional Antennas
focuses on a single direction to provide a more concentrated signal beam
Use: reaching remote locations (to a barn house example)
when creating a point-to-point connection
Yagi Antenna
provide high signal gains and uses a narrow beamwidth - directional or unidirectional antenna
used in remote locations to connect to far-off cell tower
best when capturing or sending signals over long distances to or from a specific fixed location
omnidirectional example
a cellphone
Parabolic Antenna
type of unidirectional that gives specific curvature and is used in microwave signals and satellite TV
Ex: direct TV antennas
Going to a satellite
2.4 GHz
most widely used, known for long range and better penetration through solid objects
slower data transfer speeds
tradeoff of speed versus distance
Channel
physical medium through our wireless networks can send and receive data
virtual cable that sends data through airwaves
2.4 GHz has what channels we can use?
11, 13, and 14
what 3 channels don’t overlap in 2.4 GHz?
1, 6, and 11
5 GHz Band
there’s 24 non-overlapping channels
better for video streaming and gaming
has a SHORTER RANGE and doesn’t penetrate solid objects as well
channel bonding
merge channels into two or more channels for more bandwidth
bond up to 8 channels in the 5 GHz
6 GHz
new spectrum that gives faster connections with less congestion
good with high-density areas
least amount of solid object penetration
802.11 standard was developed to comply with what
European regulations for wireless networking
DFS - dynamic frequency selection
devices monitor environment for radar signals
TPC - transmits power control
device adjust transmitting power to the minimum required for maintaining a good-quality connection
reduces interference and power consumption
Band Steering
optimize the distribution of client devices across frequency bands (2.4 and 5)
use: when 2 or more frequency bands are being utilized by networking equipment
moves devices over to 5 or 6 so its less crowded to reduce interference
