Which term describes the method of sending data where a file is split into fixed size chunks that can each travel by a different route to the destination?
Packet switching
What is the name for the section at the start of a data packet that stores the destination IP address, the sequence number and error checking data?
Header
What is meant by a router?
A node that forwards packets from one network to another by choosing a route for them
What is the name for a fixed size block of data that is sent across the internet and reassembled in the correct order by the receiver?
Packet
What is meant by the sequence number in a packet?
A value that shows the position of the packet so the receiver can put the packets back into the correct order
A telephone call sets up a dedicated connection that is kept for the whole call. What is this method called?
Circuit switching
Which statement describes how the packets of one file travel across the internet?
Packets can take different routes to the destination
A packet arrives at the recipient computer and fails the error check. What happens to this packet?
It is requested to be sent again
Why are internet routers compared to a mail sorting office?
They pass each packet on towards its destination
What term describes each point on a network diagram, such as a computer or a router?
A node
Why is packet switching used instead of circuit switching for the internet?
A dedicated line for every user would need too many connections
Why does each packet include the destination IP address?
So routers know where to send the packet
A packet arrives at a computer and the computer needs to send a reply. Which part of the packet tells it where to send the reply?
The source IP address
A router that packets usually pass through stops working. What happens to a packet that would have gone through it?
It is sent along a different route to the destination
Why does the header of each packet contain error checking data?
So the recipient can check whether the packet was corrupted on the way
Why is a file split into packets before it is sent across the internet?
So each part can be sent by a route that is free
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