Flashcards
network protocols 2
Cards in this deck (27)
- 1how is data sent between networks?it is split into equal sized packets
- 2what is the header?the header has the control information, such as destination address, source address and packet number
- 3what is the payload?the payload is the content, such as parts of e-mails, documents, web pages etc
- 4what is a checksum number?a form of validation used to check the payload hasn't been corrupted during transit. The checksum total is calculated and matched to data received correctly.
- 5what hardware uses packet switching?routers use packet switches to direct data packets on the internet and other iP networks
- 6what does the router do about the header?reads the header and decides which way to send the packed, according to the IP rules
- 7what does data transfer depend on?depends on the network traffic so packets take different routes. Too many at once leads to prioritising some over others.
- 8how does the device order the packets correctly?when received in the wrong order, the receiving device uses the packet numbers to reassemble them into the right order
- 9what happens if some data packets go missing?if the device hasn't received them within a certain time, it sends out a timeout message back to the sending device.
- 10what happens lastly if all the data is received?if all the data is received, a receipt conformation is sent out to the sending device.
- 11what is TCP/IP?the protocol that dictates the way data is sent between networks.
- 12what is TCP? (transmission control protocol)sets the rules for how devices connect on the network. in charge of splitting data into packets and reassembling the packets back into the original data on the receiving device.
- 13what is IP?internet protocol is responsible for packet switching
- 14what is HTTP?hyper text transfer protocol is used by web browsers to access websites
- 15what is HTTPS?HTTP Secure is a more secure version of HTTP
- 16what is POP3?post office protocol that retrieves emails from the server, the server holds the email until you download it, then deletes it
- 17what is iMAP?retrieve emails from a server. The server holds them until you actually delete it, you only download a copy.
- 18what is SMTP?simple mail transfer protocol used to send emails between servers
- 19what are the network protocols divided into?layers
- 20what does self contained layers mean?means the individual layers do their job without needing to know what is happening in the other layers
- 21what does each layer serve?the layer above it
- 22what are the layers?L4-application layer
L3- transport layer
L2- network layer
L1- data link layer - 23what is the application layer?turning data into websites and other applications vice versa
- 24what is the transport layer?controlling data flow, eg splitting data into packets and checking packets are correctly received or sent
- 25what is the network layer?making connections between networks, directing data packets and handling traffic
- 26what is the data link layer?passing data over the physical network.
- 27what is the advantages of using layers?- breaks down communication into manageable pieces
- layers can be changed without affecting other layers
- set rules for each layer makes it compatible for any device
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- GCSE Computer Science (Computer Systems) Flashcards on network protocols 2, created by Katie S on 09/05/2017.
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- Katie S
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