Question

When using IPsec, how can you ensure that each computer uses its own private key pair?

Answer 1

By using digital certificates.

Explanation: Digital certificate are used for the following:

1) Digital certificates are used in public key cryptography functions; they are most commonly used for initializing secure SSL connections between web browsers and web servers.

2) Digital certificates can also be used for sharing keys to be used for public key encryption and authentication of digital signatures.