6.4 Wireless networking,CSMA and SSID
What is a MAC address?
A unique code that identifies a particular device on a network
What is the point of CMSA/CA
Allow various devices to transmit data at high speeds without interfering with each other.
How do we overcome the hidden node problem?
CMSA/CA with RTS and CTS
CSMA/CA
CSMA/CA
after it checks if the channel is idle:
RTS signal is transmitted
what is an SSID?
Service Set Identifier, the name of a Wi-Fi network
What two components are need to form a wireless network?
WAP - wireless access point - usually built into router - connect devices wirelessly to a LAN NIC - to connect to WAP
Define what is meant by Wi-Fi?
a standard method for connecting devices wirelesslly to a network
What when is RTS and CTS implemented?
after when it checks if the channels are idle
What is the first step of CSMA/CA?
assemble a frame
What does CTS stand for?
clear to send
what is meant by whitelist?
create a 'whitelist' of MAC addresses from devices that you know to be trustworthy
after it assembles a frame:
it see if the channel is idle
If the channel isnt IDLE:
it waits a random amount of time then sends another RTS and repeats till its true
if its not idle?
it waits a random number of time and repeats the process again.
every device which wishes to connect to the network
must use the same SSID in order to communicate
The data is sent via?
radio waves
What does RTS stand for?
request to send
If the channel is IDLE:
the cts sends a signal back through the WAP and the data is transmitted
If the channel is idle?
the data is transmitted
How to connect to the internet WiFi?
they connect to the internet via a wireless access point
by setting the ssid from visible to hidden what does achieve?
they have to know the SSID in order to connect to the network
what is meant by WPA2?
uses strong type of encryption
What is hidden node problem?
when a node can be heard by WAP but not by the other node
What are the three methods of security on a wireless network?
whitelist wpa2 set ssid from visible to hidden
What is the criteria that has to be true in order for a device to connect to a wifi?
will connect through a wireless access point and must have its own unique MAC address.
