Security+ Guide to Network Security Fundamentals

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Answer: access control list (ACL) access control list ACL 4. ____ are user accounts that remain active after an employee has left an organization. Answer: Orphaned accounts Authentication Services 1. Note that authentication services can be provided on a network by a dedicated authentication, authorization, and accounting (AAA) server or by an authentication server. 2. Explain that the most common type of authentication and AAA servers are RADIUS, Kerberos, Terminal Access Control Access Control Systems (TACACS), and generic servers built on the Lightweight Directory Access Protocol (LDAP). RADIUS 1. Explain that RADIUS, or Remote Authentication Dial In User Service, was developed in 1992 and quickly became the industry standard with widespread support across nearly all vendors of networking equipment.
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Security+ Guide to Network Security Fundamentals, Fourth Edition 9-7 2. Emphasize that RADIUS is suitable for what are called “high-volume service control applications” such as dial-in access to a corporate network. 3. Discuss the steps for RADIUS authentication. Refer to Figure 9-7, which illustrates the steps. Kerberos 1. Explain that Kerberos is an authentication system developed by the Massachusetts Institute of Technology (MIT) and used to verify the identity of networked users. 2. Describe how Kerberos works. Terminal Access Control Access Control System (TACACS) 1. Explain that similar to RADIUS, Terminal Access Control Access Control System (TACACS) is an authentication service commonly used on UNIX devices that communicates by forwarding user authentication information to a centralized server. 2. Note that the centralized server can either be a TACACS database or a database such as a Linux or UNIX password file with TACACS protocol support. 3. Refer to Table 9-5 for a comparison of RADIUS and TACACS+. Lightweight Directory Access Protocol (LDAP) 1. Define a directory service, which is a database stored on the network itself that contains information about users and network devices. 2. Emphasize that it contains information such as the user’s name, telephone extension, e- mail address, logon name, and other facts. 3. Explain that the directory service also keeps track of all of the resources on the network and a user’s privileges to those resources, and grants or denies access based on the directory service information. 4. Note that directory services make it much easier to grant privileges or permissions to network users. 5. Explain that LDAP makes it possible for almost any application running on virtually any computer platform to obtain directory information.
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