compsci test 2

what is TCP

what is TCP

governs the creation and reassembling of packets. it establishes a connection, breaks down packets, and maintains the credibility that the packets are legit. it confirms that all the packets are there when delivered.

what is UDP

it’s used for people that need a faster transmission, because it doesn’t formally establish a connection before data is transferred (has some risk with packets being lost or DDoS attacks). it doesn’t establish a connection, indicate the order of the packets, or check whether they arrived as intended.

how are packets sent

packets can take different routes to get to one destination, and they might arrive at the destination at different times or out of order. after packets are sent, TCP checks to see if they are all there. if the packets are not all there, then TCP does not sign and the packets have to be resent and verified again that they are all there. if out of order, packets are reassembled.

what is bandwith

the maximum amount of data a network connection can move in a certain amount of time

what is bandwith measured in

megabits per second

how many bits are in a megabit

a million

is it possible for packets to be sent out of order

yes.. like text loading before images on a website

what happens when packets are out of order

they are reassembled, but not sent back to the router

when are packets resent by the router

if they were not sent the first time and TCP verifies their abscense

nonproprietary meaning

open (in reference to a protocol)

what is HTTP

used to load webpages using hypertext links. it is a language made mostly of get and post requests. get requests ask for the HTML code, which defines what the webpage looks like. the text of a webpage is in the HTML, whereas images/videos are URLs that need to be requested like typing in a URL website.

what is DNS

the computer uses DNS to look up domain names so it can figure out what IP address to request from.

what is the world wide web

a system of web-pages, programs, and files. everything has a URL and HTML is used with the HTTP protocol

what is the internet

a network of computing devices that don’t necessarily have to use the www, can be a telephone call or a text message that only uses tcp/ip

what is cookie data

data so that a website can remember who you are

what is HTTPS

same thing as HTTP except it’s secure. websites with HTTPS provide a digital certificate of security to your device