What are three requirements for creating a custom application? (Choose three.)

In Junos OS, custom applications are defined within the security configuration hierarchy (edit applications application ) to identify non-standard or proprietary network traffic for security policy matching. When defining a basic custom application object, three mandatory components must be specified: the application name (which identifies the custom application object), the IP protocol (such as TCP or UDP), and the destination port number or range. These attributes allow the SRX Series device to accurately match packet header fields against the custom application definition. Defining source addresses or security policies is executed outside the application object configuration, as policies reference application objects to enforce traffic rules across specified source and destination zones or network addresses.

B. Defining a security policy is a separate step in security configuration; policies reference application objects but are not a requirement for creating the custom application object itself.

D. Source addresses are configured within address books or specified directly in security policies, not within the custom application object definition.

1. Juniper Networks Official Documentation: Junos OS Security Configuration Guide: Applications and Application Sets, Section: "Defining Custom Applications", pp. 112–115.

2. Juniper Networks TechLibrary: Junos OS CLI Reference Guide, Hierarchy: [edit applications application application-name].