9.3 What parameters identify an SA and what parameters characterize the nature of a particular SA?
9.4 What is the difference between transport mode and tunnel mode?
9.5 What is a replay attack?
9.6 Why does ESP include a padding field?
9.7 What are the basic approaches to bundling SAs?
9.8 What are the roles of the Oakley key determination protocol and ISAKMP in IPsec?