AP CSP M2

Takes inventory of all packets in the datastream to ensure they are successfully sent and received.

Transmission Control Protocol (TCP)

Messages are divided into packets and sent all at once. There is no error-checking to ensure all packets arrive or that they're in order. UDP is faster than TCP but more errors are possible. This is useful

UDP: User Datagram Protocol

Sends all packets without checking whether they were received or ordered properly

User Datagram Protocol (UDP)

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 receiver. TCP is slower than UDP because error checking like this takes more time, but it is much more reliable.

TCP: Transmission Control Protocol

Pick the two statements that are true about the Internet Protocol (IP):

#1 Each device or computer on the Internet is assigned a unique IP address. #2 IP is the shared way that all devices and computers label their messages with the sender and receiver's addresses.

Choose the two statements that best describe the relationship between HTTP and the World Wide Web

#1 The World Wide Web is a collection of pages and files that is shared between computers using HTTP; #2 HTTP and the World Wide Web both rely on other layers of protocols for sending information on the Internet

Pick Two: If the post office delivered mail exactly like the routers deliver messages on the Internet, which of the following statements would be true?

#1 The mailman would sometimes take a different path to deliver each letter to your home. #2 Letters would be written on the outside of the envelope for all to read instead of letters put inside envelopes

Which of the following is true regarding the way information is transmitted on the Internet?

Information does not travel in one piece, but rather as a data stream of packets.

The Internet, A Mobile Hotspot, School Computer Lab.

Internet Protocol (IP)

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

DNS: Domain Name System

The way in which information travels on the Internet, not as a single piece but in chunks.

Datastream

Computers communicate in plain text like GET to request files or send data. The server that receives 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.

HTTP: HyperText Transfer Protocol

Each device on the internet is given a unique IP address. Packets sent on the internet include to and from IP addresses. Routers along the way use this information to move data along a path of direct connections. Routing happens dynamically, meaning the path is unpredictable and changes based on network conditions.

IP: Internet Protocol

Chunk of data and its metadata, used to route and reassemble information on the Internet.

Packet

Fiber optic cables, wifi signals, or copper wires physically connect the computers, smart phones, servers, etc. that make up the Internet. Computers don't need to be directly connected to each other, just a single point on the network.

Physical Network

In the Internet Simulator, your router knows to send your message to a different router because:

The first 4 bits of the address specify the router number that your friend is on.