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Computing Flashcards (1.5)
Flashcards do conjunto (13)
- 1What is a Wi-Fi frequency? What is it measured in?Number of audio waves in a second.
It is measured in GHz or Hz. - 2Why are there a number of channels available for Wi-Fi?As otherwise the frequencies will not be orderly and connections will get mixed up.
- 3Describe types of Wi-Fi encryption methodsEncryption is when data is translated into a code that only someone with the correct key can access.
- 4What is the Ethernet protocol?A set of instructions that devices use to connect through wires
- 5Compare IP addressing with MAC addressingIP addressing is the 32 or 128-bit binary number used when sending data over the internet. They aren't linked to hardware, while MAC addresses are. MAC addresses have 48 or 64-bit binary.
- 6What is TCP/IP (Transmission Control Protocol/Internet Protocol) used for?It dictates how data is sent between networks.
- 7What is HTTP (Hyper Text Transfer Protocol) used to do?It is used by web browsers to access websites.
- 8What is the FTP (File Transfer Protocol) used for?This is used to access, move and edit files between devices on a network.
- 9What is the difference between POP (Post Office Protocol) and the IMAP (Internet Message Access Protocol)?Both are used to retrieve emails, but POP only holds the email until it is downloaded then deleted from the server, whereas IMAP servers hold the email until the user deletes it.
- 10What is the SMTP (Simple Mail Transfer Protocol) used for?Used to send emails and to transfer them between servers.
- 11What is a layer in a protocol stack?A group of protocols with a similar function.
- 12Describe 4 network layers.1) Data Link Layer- Passing data over the physical network
2) Network Layer- Makes connections between networks, directs data packets and handles traffic.
3) Transport Layer- Controls data flow
4) Application Layer- Turns data into websites and other applications - 13Describe packet switching.Used by routers to direct packets on the internet. The sending device splits the data into packets, which are given a packet number. They will be passed through each router, choosing the fastest route based on traffic. They can arrive in the wrong order so the packet numbers are used to reassemble them. The receiving device will check all packets are received and done by using a check sum. If both device's calculations match then a receipt confirmation is sent to each device. Otherwise it's asked to re-send.
Informações
- Descrição
- Network topologies, protocols and layers
- Criado por
- Grace Wenham
- Visualizações
- 2
- Avaliação
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