7.You need to configure fine-grained access control to external network resources from within your

database. You create an access control list (ACL) using the DBMS_NETWORK_ACL_ADMIN package.

Which statement is true regarding the ACL created? A. It is a list of remote database links stored in the XML file that are available to the users of the database. B. It is a list of users and network privileges stored in the XML file according to which a group of users can connect to one or more hosts. C. It is a list of users and network privileges stored in the data dictionary according to which a group of users can connect to one or more hosts. D. It is the list of the host names or the IP addresses stored in the data dictionary that can connect to your database through PL/SQL network utility packages such as UTL_TCP. Answer: B

解析:

Oracle allows access to external network services using several PL/SQL APIs (UTL_TCP, UTL_SMTP, UTL_MAIL, UTL_HTTP and UTL_INADDR), all of which are implemented using the TCP protocol. In previous versions of the database, access to external services was effectively an on/off switch based on whether a user was granted execute permissions on a specific package or not. Oracle 11g introduces fine grained access to network services using access control lists (ACL) in the XML DB repository, allowing control over which users access which network resources, regardless of package grants.

参考:

http://www.oracle-base.com/articles/11g/fine-grained-access-to-network-services-11gr1.php