How do you take down a Juggernaut?

Even with Juggernaut players are still very vulnerable to headshots (due to the damage multiplier). Most headshots 'overkill' a player so you never really realize how much more damage they actually do.

To deal with a juggernaut: crouch behind a box, wait for them to walk by and stick a semtex to them, knife them, or (the most reliable) repeatedly shoot them in the head.

Sustained high damage is the key.

Juggernauts heal fairly quickly, so you have to keep up the damage.

Explosives help a lot, but the main thing to do is to make sure they're never getting a chance to heal up. Do this by keeping yourself alive to continuously fire at them, or fire at them with a team mate.

I kill them instantly using a Predator Missile kill streak. Obviously you have to wait until the juggernaut is outside before using this though.

Also a light machine can kill them in one round, and you can run circles around them to avoid getting shot.