1.3.3 networks Flashcards
what is a network?
2 or more computers connected together that transmit data
what is physical topology?
the physical layout of a network
what is logical topology?
the topology that describes the flow of data through a network
what is bus topology?
topology in which all terminals are connected to a backbone cable
name an advantage of the bus topology
cheaper to set up, doesn’t require any additional hardware
name a disadvantage of the bus topology?
if the backbone cable fails, the entire network is disconnected, as traffic increases performance increases, all computers can see data transmission
what is the star topology?
a network in which a central node directs the flow of data, each terminal is connected to the central node
name 2 advantages of the star topology
no data collisions, if a cable fails only that node is affected
name a disadvantage of the star topology?
expensive due to switch and cabling, if the central switch files the rest of the network fails
what is a mesh topology?
a topology in which every node is connected to every other, most commonly found with wireless technology
name 2 advantages of the mesh topology?
no cabling cost, faster since data doesnt travel through a central switch
give a disadvantage of the mesh topology
needs to purchase devices with wireless capabilities, maintaining the network is difficult
what are protocols?
a set of rules defining how 2 devices communicate with each other
why are protocols standard?
so that devices from different manufactures don’t have problems communicating
describe the structure of the Internet
the internet is a global network of interconnected networks
what does TCP stand for?
transmission control protocol
what doe IP stand for?
internet protocol
What is the function of the application layer during data transmission?
The Application Layer specifies what protocols need to be used to relate the application to what it’s being used for.
What is the role of the transport layer during data transmission?
Establishes an end-to-end connection between the source and recipient computers. It also splits up the data into packets
What is the role of the network layer during data transmission?
Adds the source and destination IP addresses.
What is the function of the link layer during data transmission?
adds the MAC address to the packet
what does the application layer do when it receives data?
presents data in the form it was sent
what does the transport layer do when it receives the data?
removes the port number and reassembles the packets
what does the network layer do when it receives the data?
removes the IP addresses
