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CNSE 4.1 Exam Preparation GuideV3.pptx - Palo Alto Networks

CNSE 4.1 Exam Preparation GuideV3.pptx - Palo Alto Networks

CNSE 4.1 Exam Preparation GuideV3.pptx - Palo Alto Networks

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Blocking Skype<br />

• The skype application is classified on the PAN device as two separate<br />

applications: skype-probe and skype.<br />

• In general, think of the skype-probe application as the control channel,<br />

and “skype” application as the data channel.<br />

• Since skype is so evasive, the way you prevent skype from sending or<br />

receiving voice or video is by allowing skype-probe, but blocking<br />

skype.<br />

• This forces skype to use a communication that is easy to predict and<br />

block via App-ID<br />

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