1.1 what is the osi security architecture? 1.2 what is the difference between passive and active security threats? 1.3 list and briefly define categories of passive and active security attacks. 1.4 list and briefly define categories of security services. 1.5 list and briefly define categories of security mechanisms. 1.6 list and briefly define the fundamental security design principles. 1.7 explain the difference between an attack surface and an attack tree.