# Multiple JAAS Modules

The prebuilt JAAS modules support stacking, which provides great flexibility. Using multiple modules, you can direct the EMS server to check authentication using any arrangement of the modules.

A common example would stack the LDAP Authentication module with the Host Based Authentication module to authenticate a user by credentials and IP address. Another example would include stacking multiple LDAP Authentication modules to search different branches of an LDAP tree.

There are no restrictions on which or how many modules can be stacked.

For examples of stacking, see Using Multiple JAAS Modules.

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