Achieving High Availability Setup for a Web-Based Application

A company's web-based application has a database that is set up for high availability in case of a failure.

Which of the following is necessary to achieve this type of setup?

A.

A virtual IP pointing to the active DB

B.

A static IP pointing to the passive DB

C.

A private IP pointing to the web front end

D.

A private IP pointing to the web proxy.

A.

To achieve high availability for a web-based application with a database, it's essential to set up a failover system that can switch the traffic from the primary database to a secondary database in case of a failure.

The option A - "A virtual IP pointing to the active DB" - is the correct answer because it's the most common method to achieve high availability for a database. A virtual IP (VIP) is an IP address that is not assigned to a specific server but rather to a service or application. In this case, the VIP points to the active database server, and in case of a failure, the failover mechanism switches the VIP to the secondary database server, making it the new active database server.

Option B - "A static IP pointing to the passive DB" - is incorrect because pointing to a passive database does not ensure high availability as there is no automatic failover mechanism in place to switch traffic to the secondary database.

Option C - "A private IP pointing to the web front end" - is incorrect because it is not related to the database or high availability. The private IP is usually used for internal communication between servers and devices.

Option D - "A private IP pointing to the web proxy" - is also incorrect because it is not related to the database or high availability. The private IP is usually used for internal communication between servers and devices, and a web proxy is not necessarily related to the high availability of a database.

Therefore, the correct answer is A - "A virtual IP pointing to the active DB."