Final answer:
An entry in an Access Control List (ACL) is called an Access Control Entry (ACE), and it specifies permissions for a user or process.
Step-by-step explanation:
An entry in an Access Control List (ACL) is known as an Access Control Entry (ACE). An ACL is a list of permissions attached to an object that specifies which users or system processes are granted access to objects, as well as what operations are allowed on given objects. Each entry in an ACL is an ACE, which consists of the identity of the subject (like a user or group), the access type allowed, and the operations permitted. Therefore, the answer to the student's question is b. ACE.
ACEs are used to define permissions and restrictions for network resources. They contain information such as the source and destination IP addresses, ports, and the actions to be taken (allow or deny) for network traffic.
For example, if an administrator wants to allow access to a specific website for a certain IP address range, they can create an ACE with the appropriate rules and add it to the ACL.