Which of the following is an application protocol that is used to query and modify data using directory services running over TCP/IP?
A.
LDAP
B.
HTTP
C.
LEAP
D.
RBAC
Explanation:
The Lightweight Directory Access Protocol (LDAP) is a standard protocol, which provides access to the directory. It also provides a common language for LDAP clients and servers to communicate with each other. The LDAP is commonly used as standard in the industry. By using a directory service such as LDAP, information existing in multiple systems and formats can be brought at one place.Answer option D is incorrect. Role- based access control (RBAC) is an approach to restricting system access to authorized users. It is a newer alternative approach to mandatory access control (MAC)and discretionary access control (DAC). RBAC is sometimes referred to as role-based security. RBAC is a policy neutral and flexible access control technology sufficiently powerful to simulate DAC and MAC. Conversely, MAC can simulate RBAC if the role graph is restricted to a tree rather than a partially ordered set. Answer option B is incorrect. Hypertext Transfer Protocol (HTTP) is a client/server TCP/IP protocol used on the World Wide Web (WWW) to display Hypertext Markup Language (HTML) pages. HTTP defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various commands. For example, when a client application or browser sends a request to the server using HTTP commands, the server responds with a message containing the protocol version, success or failure code, server information, and body content, depending on the request. HTTP uses TCP port 80 as the default port. Answer option C is incorrect. LEAP (Lightweight Extensible Authentication Protocol) is a proprietary wireless LAN authentication method developed by Cisco Systems. Important features of LEAP are dynamic WEP keys and mutual authentication between a wireless client and a RADIUS server. LEAP allows clients to re-authenticate frequently. The clients get a new WEP key upon each successful authentication.