How not to get outjabbed?

[Mr.MojoRisin']

Find your range.

[DinoCop]

Vary the jab. Jab is an umbrella term for lead hand straights. So, there are so many ways to shoot that straight and many places to shooting it on.
Jab high and low and fake high and low. Throw the jab from the bottom, throw it straight, throw it when you are stepping to north-west. Shoot the low and and at the same time rotate your trailing foot to the south-west and end up in a blind spot for him.