You want to verify that all application traffic traversing your SRX device uses standard ports. For
example, you need to verify that only DNS traffic runs through port 53, and no other protocols.
How would you accomplish this goal?
A.
Use an IDP policy to identify the application regardless of the port used.
B.
Use a custom ALG to detect the application regardless of the port used.
C.
Use AppTrack to detect the application regardless of the port used.
D.
Use AppID to detect the application regardless of the port used.
Explanation:
AppTrack for detailed visibility of application traffic Also AppTrack is aka AppID
Reference :http://forums.juniper.net/t5/SRX-Services-Gateway/What-is-AppTrack-aka-AppID/tdp/63029
An Application Layer Gateway (ALG) is a software component that is designed to manage specific
protocols
Reference :http://www.juniper.net/techpubs/software/junos-security/junos-security95/junossecurity-swconfig-security/id-79332.html