38340927
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Flashcards by Malachy Moran-Tun, updated more than 1 year ago
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| Question | Answer |
| What is contained in a Packet Header? | > Sender and recipient IP address > Sequence number - allows packets to be re-arranged into the correct order at the end > Checksum - to ensure that all data was sent correctly |
| What happens on the Sender's LAN when Sending Packets? | > Data is generated from an application on the sender's computer (application layer) > Data is split into packets (transport layer) > IP addresses are added to each packet (Internet layer) > Packets are grouped into frames and sent to the router (network layer) |
| How are Packets sent over a WAN / the Internet? | > Sender's router inspects each packet to check if the IP is on the current LAN > If not, the packet is to be sent over the Internet, or other WAN > Each packet is sent from the sender's router to the destination router via connected routers > The route of each packet is often different, in order to maximise efficient use of the network, and to avoid bottlenecks |
| What happens on the Recipient's LAN when Receiving Packets | > Packets will often come in the wrong order since they have taken different paths > Packets are unpackaged and reassembled into the correct order using the sequence number |
| What happens when a Packet is not Received? | > Packets might get lost within the network > Each packet transfer has a certain timeout, i.e., the max amount of time the transfer is expected to take > If the time taken is larger than the timeout, a timeout signal is sent to the sender, which resends the packet |
| What happens when a Packet is Corrupted? | > Network interference can cause data to become corrupted (charged) > When data is assembled into packets, the checksum is calculated and sent along with the packet > When data is received, the recipient recalculates the checksum > If the values are different, the data was corrupted, and the data is requested again |
| What happens when All Packets are Received Successfully? | > Confirmation message is sent to the sender > Makes the sender certain that there were no issues in transmission that they might need to fix |
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