how many bits is a byte?
8
what are protocols?
rules and conventions for communication, covering syntax, semantics, and timing/sequences
Break down an in-person voice conversation
understanding -> tone -> sentences -> words -> phonemes -> sounds+air (and then reversed for person listening)
break down a telephone voice conversation
understanding -> words -> phonemes -> sounds+air -> mic+phone -> phone network (and reversed for person recieving)
what is the simplified model of full open systems interconnection
high (end-user applications and sessions - HTTP) -> medium (transportation and networking - TCP/IP) -> low (physical interface and data transmission - WiFi)
what issues do low layers of communication deal with?
physical signals (timing), interference and errors, sharing collisions and congestion
explain IP
Internet Protocol. all traffic on the internet is transmitted through packets. A packet has a source IP address, a destination IP address, and the payload. It is basically the addresses for every device
explain DNS
Domain name system. it converts between the friendly internet names (google.com) to ip addresses. Every device has a DNS server, when you search for something like google.com, your device asked DNS for the ip address, and if yours doesn’t know, it searches other servers until it finds it
what are two ways we solved the issue of not having enough IP addresses
DHCP - gives temporary ip addresses while connected to a public wifi (like hotel rooms)
NAT - multiple devices share a single IP address
