The internet is a vast network of linked computer it is also the largest WAN
Every devices has an IP address which shows how to locate all information has it sent over the internet contains packets of information
router receive the frame and process the packet information
the router removes the outside layers and determines how to send the data correct destination they take sway the frame and finds the best way to get the parts to the other end of the computer
most people access the internet through a LAN
data that through ISPs
they connect through routers the interconnects WANs and LANs on the internet
hops from router to router
ping sends test packets over the internet and evaluates the connection from the machine they are sent from.
Fire wall can be hardware or software protects from things you don't want coming in.
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