IPSec certs vs shared secret



All,
Hopefully this isn't a completely ridiculous question, but with IPSec when
two machines negotiate a connection, they can be configured to initially use
Kerberos, Certificates, or shared key authentication (if I understand
correctly). How much more secure are certificates than shared secrets?
Wouldn't it be possible to use a Man in the Middle (MITM) attack by simply
replaying a cert the same way you would a shared secret?

-P


.



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