I don't know if the Sentinel have cannons to attack, I know that it's only a transport but don't has any to defense, so I think it don't has good playability, and there are a lot of best Imperial ships tan Sentinel, greettings.
It is described with 8 laser cannons and 2 concussion missile launchers in the front, a retractable ion turret just behind the cockpit. Defense wise, it is described as being heavily armored and very maneuverable for its size, which lead to its rampant growth in popularity. It is as long as the new VT-49 in wave 5, to give you an image of scale.
Greetings!