Both reasons for layered protocols are persuasive. An example must substantiate your assertion

A common criticism of layered protocols is the apparent overhead of copying at each stage. Is there any way to put a stop to copycats?

Explain four protocols to prevent deadlock. What is the limitation of preventing deadlock?

Needham and Schroeder suggest the following variant of their protocol: 1. Alice → Bob : Alice 2. Bob→ Alice: {Alice rand3}kBob 3. Alice → Cathy : {Alice Bob rand₁|{Alice rand3}kBob} 4. Cathy → Alice: {Alice Bob rand₁|ksession|{Alice rand3|ksession}KBob}KAlice 5. Alice → Bob: {Alice rand3|ksession}kBob 6. Bob→ Alice: {rand2}ksession 7. Alice → Bob: {rand2-1}ksession Show that this protocol solves the problem of replay as a result of stolen session keys. Hint: Consider two cases, one in which the attacker does not send an initial message to Bob and one in which the attacker does.

What are the two strongest justifications for layered protocols?

Why is exercise testing protocol selection important?

Is your knowledge of SSL and TLS up to par?Could different groups of people be isolated?

Network & Data Communications

There are two main justifications for using layered protocols, and both are persuasive. To back up the assertions you make, you must provide an example.

At what point in time should inquiries into queuing protocols be initiated?