Fundamentals Of Communication And Networking Flashcards
Wifi and it’s purpose
A wireless local area network that is based on international standards
Used to enable devices to connect to a network wirelessly
Components required for wireless networking
Wireless network adapter
Wireless access point
How does disabling the SSID increase security of a network
SSID of the network cannot be seen when trying to connect so only trusted users who knows the SSID of the network can connect
How does MAC address white list increase security of a wireless network
MAC is a unique code that can identify a particular device on a network
Whitelisting means that only certain trusted people on a network can access it
CSMA/CD protocol
To detect collisions and and only starts transmission when the channel is free before a station starts transmission. Ethernet is not required.
Purpose of SSID
allows user to connect to the desired network when multiple independent network operate in the same area
Peer to peer
Doesn’t need a central server and easier to set up
Less secure and speed of one machine can affect other machines in a network
Physical star topology
How nodes are physically laid out
Logical star topology
How data flows through a network
How can a network physically wired in a star topology behave logically as a bus network
By using a bus protocol and appropriate physical switching
Client server networking
Faster access speed and more secure
Client is dependant on the server
Baud rate
Number of signal changes in the medium in a second
Bandwidth
Range of frequencies that can be transmitted across a network connection
Protocol
Set of rules
Bit rate
Number of bits transferred between devices in one second
How can bit rate be higher than baud rate
If more than one bit is encoded in each signal change
Relationship between bit rate and bandwidth
Bit rate = baud rate x no. Of bit pet baud
Where:
Bit rate is directly proportionate to bandwidth
Synchronous data transmission
Where the pulse of the clock of the sending and receiving devices are in time with each other. They might share a common clock
Asynchronous data transmission
Data is transmitted between two devices that do not share a common clock signal
Start and stop bit in asynchronous
Indicates to the receiving device when the data transmission begins and ends
Serial transmission
Data flows through a signal line
Parallel transmission
Data flows through multiple lines
Why serial transmission is better than parallel
Cheaper as less wire is required
Doesn’t suffer from crosstalk as there is only one transmission line
