Things you should know for the test

Ethernet
   	What is a MAC address
   	How do you translate from an IP to a MAC address

IP
	What is an IP Number
	What is a private IP Number
	IP Numbers.  Do we have enough
	IP number have a host and a network portion
	What does 1.2.3.4/12 mean?
	You cannot make an IP socket, IP is just a tool for TCP or UDP or ICMP
	IP has never heard of ports

UDP
	You can make a socket for UDP.
	It is connectionless (unreliable, out-of-order, no error detected)
	It basically is IP with port numbers.

TCP
	You can make a socket for TCP.
	It is reliable and in order with error detection.
	It has a three packet startup with various flags set in the header.
	It has a two packet end with various flags set in the header.
	It's packet is 20 bytes long (or more).
	It uses sliding window

Routing
	Autonymous systems are a thing.
	Inside each AS no one cares what you do.
	Between ASs everyone uses BGP.
	BGP finds the shortest route between ASs (but is not optimal).

Programming
	socket() says which kind of socke you are making TCP or UDP
	TCP uses read/write
	UDP uses readmsg and revcmsg (which we have not done).

DNS
	Everything this is in both vidoes
	Maybe everything in either video.

Ports
	There is a list of standard port numbers at https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
	Ports go from 1 .. 64K