How much bandwith does a competitve CS:GO match require

Team Collision determines whether you can walk through your team-mates or not.

If team collision is on, then your team-mates will act the same way as an enemy when you come into contact with them, namely, they will be able to block doors and the like with their body.

If team collision is off, then you will be able to freely walk through your team-mates.

This is a mostly anti griefing option, so that people can't purposely block doors to prevent their team-mates from getting out of spawn. It is also a tactical concern, as you can't stuff a bunch of players in one position if team collision is on.

Keep in mind that enemies will always have collision on.

There are two methods, you can open up the console in game and type "connect 127.0.0.1:27015" where 127.0.0.1:27015 is your IP address and port number. You have to have the console enabled for this option to work. Usually it's by hitting escape to bring you to the menu and then pressing the tilde (~) key.

Or you can add the server to favourites from in game or out of game through steam. You do this by bringing up the server window, and clicking on the Add A Server button and it will ask you to add the server address to the window and then it will always be there!