Broadband Router - see here.
Network Interface Card
Ethernet Cables(also known as LAN[Local Area Network] cables) - see here.
Now, for an example of how an Network is setup - we'll use a two computer network; see outline below:
Now that you have your network setup - let's get everything configured ..
First, we want to configure the Network Interface Card to Obtain an IP Automatically - this can be done by accessing your Network Properties. This should be done on all computer(s) being networked. Now, we want to access the Router Configuration page. If you need assistance accessing the router - please use one of the forum(s) Hardware Forum(s) below to seek assistance:
here. Be sure to be as detailed as possible about your setup and device model.
Once, you've sucessfully accessed the router config page - you want to set your router to Obtain an IP Address(No User Name or Password required). Now, locate the page that will allow you to enable the MTU - which should be set for 1500.
Once all of the outlined above is setup - save your settings and power off all of your equipment. Power everything back up in this order: Modem, Router, Computers. Test your connection.
Note: If you're attempting to setup any Virtual Private Networking - view the: VPN: Virtual Private Networking FAQ
*This FAQ is based on user knowledge from a volunteer core of BroadbandReports' members. This FAQ in no way constitutes official information from Comcast or any of its affiliates.