Computing - Network Hardware

AQA Computer Science 2022

Created: February 11, 2021 | Read markdown | About these notes | View in context | Study these flashcards |

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Flashcards

Packets and packet switching

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

packets-definition

Packets

What does packet switching allow?

packet-switching-purpose

Packets to take the fastest route across a network.

Routers

What is the purpose of a router?

router-purpose

To forward data packets from one network to another.

What does your home router connect your network to?

home-router-connects-to-isp

The ISP’s network.

What is the name for transfering across a network using a router?

hop-definition

A hop.

How do routers know which new router to send a packet to?

routing-table-purpose

Using a routing table.

Packet structure

What is the segment of data in a packet called?

payload-definition

The payload.

What two IP addresses are in the header of a packet?

header-ip-addresses
  • The sender’s IP address
  • The recipient’s IP address

How does the recipient know what a packet contains?

header-contains-protocol

The header contains the protocol.

How does the recipient know how to order the packets it receives?

header-contains-packet-number

The header contains the packet number.

What are the three sections of a packet?

three-packet-sections
  • Header
  • Payload
  • Trailer

How does the trailer part of a packet allow you to verify the data?

trailer-contains-checksum

They contain a checksum.

Packet size trade-offs

Why are packets kept small?

packets-kept-small-reason

So that individual packets don’t take too long and slow down the other packets.

Why aren’t packets made super small?

packets-not-too-small-reason

Because otherwise you’d waste a lot of space with headers and trailers.

Time To Live

What part of a packet header limits the amount of time it’s allowed to take?

time-to-live-purpose

Time To Live



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