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Posted on 2011-03-20
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Hello:

I am interested in learning which protocol is best either TCP, UDP, or Tunneling (Proxy). Please see assignment question below.

Question:
Suppose there are two separate domains, one at SECRET (S) and one at Top Secret (TS), with a guard between them. Assume the guard is truly a “diode”, allowing packets in only one direction. What direction will the guard allow traffic to flow? Suppose you want to move traffic in the allowed direction. Can you run an ordinary TCP connection through the guard to pass it through the guard? Explain why/why not, and if not, what protocol can you use to move the data?
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Question by:Sundayy
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DrUltima earned 500 total points
ID: 35182788
It would have to be one way.  Remember that each level of classification builds on other levels.  If you have Top Secret clearance, it assumes Secret clearance.  Because of this, a Secret domain will be allowed to pass information UP to a Top Secret domain, but not from Top Secret DOWN to Secret.

Because UPD is the only protocol listed which doesn't require two way traffic, it defaults to the type of traffic which must be utilized through the guard.  Ordinary TCP never works only one way.

DrUltima
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Author Closing Comment

by:Sundayy
ID: 35186745
Thanks for the clarification.
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