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L1-07E.29 – Ports

L1-07E.29 – Ports Imagine that you are a truck driver for Wal-Mart, hauling pineapples You know that the distribution center is located at 1234 Mockingbird Lane, but when you arrive, there are 65,534 overhead doors and one main entrance door Which door do you back...

L1-07E.28 – Ports

L1-07E.28 – Ports Any server machine makes its services available to the Internet using numbered ports, one for each service that is available on the server Clients connect to a service at a specific IP address and on a specific port Common Port Numbers echo 7 daytime...

L1-07E.26 – Domain Name System

L1-07E.26 – Domain Name System Since it is easier to remember google.com than it is 74.125.227.65, we use Domain Name Servers to translate IP addresses into useful names. Like using landmarks and store names rather than latitude and longitude when giving directions....

L1-07E.25 – Subnets

L1-07E.25 – Subnets Subnets define a specific number or devices on a network Can be used to restrict communication For example you might put the alarm panel on a different subnet from the office...