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Assuming this is a good faith question: while this is not guaranteed, it is highly likely a vaccine will prevent disease transmission (given how the Pfizer and Moderna vaccines help create an antibody response to coronavirus's spike protein), breaking chains in viral spread.

Edit: correction to better reflect the mRNA vaccine mechanism.

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Assuming this is a good faith response: Maybe and maybe not.

https://www.nytimes.com/2020/07/14/health/coronavirus-nasal-...

> Without a strong mucosal response, injected vaccines may be less likely to produce so-called sterilizing immunity, a phenomenon in which a pathogen is purged from the body before it’s able to infect cells, Dr. Durbin said. Vaccinated people might be protected from severe disease, but could still be infected, experience mild symptoms and occasionally pass small quantities of the germ onto others.

I’ve also read that levels of exposure inversely correlate to outcomes: all else being equal, being exposed to less virus leads to better outcomes.

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