Bitter rivals clash as the San Francisco 49ers and the Las Vegas Raiders go head-to-head in Week 2 of the NFL preseason today.

NFL Network will air four live preseason games. However, they are not national broadcasts. The games will not have NFL Network broadcasters. They will carry the home team's TV broadcast, so you will hear the hom teams' broadcast team. The coverage kicks off with the Browns and Eagles. The Cardinals will not play either team in the regular season.