IKE has two phases, Phase 1 and Phase 2. In IKE Phase 1, there are four key options and, for each of these, there is a main mode and an aggressive mode. a. Explain the difference between Phase 1 and...

IKE has two phases, Phase 1 and Phase 2. In IKE Phase 1, there are four key options and, for each of these, there is a main mode and an aggressive mode.

a. Explain the difference between Phase 1 and Phase 2.

b. What is the primary advantage of Phase 1 public key encryption main mode over Phase 1 symmetric key encryption main mode?