# Computing - Network Hardware

> Source: https://ollybritton.com/notes/a-level/computing/topics/network-hardware/ · Updated: 2021-02-11 · Tags: computing, networking

## See Also
- [Computing - Networking](https://ollybritton.com/notes/a-level/computing/topics/networking/)

## Flashcards
##### What are the equal chunks of data called that are transmitted around a network??
Packets

##### What does packet switching allow??
Packets to take the fastest route across a network.

##### What is the purpose of a router??
To forward data packets from one network to another.

##### What does your home router connect your network to??
The ISP's network.

##### What is the name for transfering across a network using a router??
A hop.

##### How do routers know which new router to send a packet to??
Using a routing table.

##### What is the segment of data in a packet called??
The payload.

##### What two IP addresses are in the header of a packet??
* The sender's IP address
* The recipient's IP address

##### How does the recipient know what a packet contains??
The header contains the protocol.

##### How does the recipient know how to order the packets it recieves??
The header contains the packet number.

##### What are the three sections of a packet??
* Header
* Payload
* Trailer

##### How does the trailer part of a packet allow you to verify the data??
They contain a checksum.

##### Why are packets kept small??
So that individual packets don't take too long and slow down the other packets.

##### Why aren't packets made super small??
Because otherwise you'd waste a lot of space with headers and trailers.

##### What part of a packet header limits the amount of time it's allowed to take??
Time To Live

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