APCSP Unit 2 Test

Physical Network- what problem does it solve?

physically connecting devices to one another so that information can move through the network

Physical Network- How does it work?

Cables, signals, wires, connect to servers, computer, etc. that make up the internet. Computers dont need to be directly connected to eachother just a single point on the network.

Transmission control protocol- How does it work?

Messages are divided into packets and sent all at once. packets are numbered so that they can be re-ordered and missing packets can be requested by the reciever. TCP is slower than UDP because error checking like this takes more time, but it is much more reliable.

Internet Protocol- What problem does it solve?

Uniquely identifying people on the internet and routing messages between them.

HTTP- What problem does it solve?

allow computers to request and share webpages, audio, images, videos, and other file types on the internet, collectively known as the world wide web.

HTTP- how does it work?

computers communicate in plain text like GET to request files or send data. The server that recieves the request responds with the files requested which are displayed by your browser. HTTP requests are sent between computers over the internet as part of TCP/IP packets. The world wide web is just files that are requested using HTTP and sent over the internet.

Internet Protocol- How does it work?

each device is given a unique IP adress. packets sent on the internet include to and from IP adresses. routers along the way use this info to move data along a path of direct connections. The path is unpredictable. and changes.

Transmission control protocol- What problem does it solve?

send large messages over the internet when accuracy is most important. TCP or UDP

User datagram protocol- What problem does it solve?

send large messages over the internet when speed is important. You would either use TCP or UDP

Domain Name system- What problem does it solve?

translate human- readable domains like code.org or example.com into Ip adresses that can be used by the internet.

Domain Name system- How does it work?

when you try to go to a domain like example.com you cpmputer first contacts a system of servers collectively called the DNS which keeps track of the IP adresses associated with each domain name. Communication with DNS happens over the interet, meaning the request to and from servers are sent as TCP/IP Packets.

User datagram protocol- How does it work?

when you try to go to a domain like example.com, your computer first contacts a system of servers collectively called the DNS which keeps track of the IP adresses associated with each domain name. Communication with DNS servers are sent as TCP/IP Packets