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Question 168

-- Exhibit

-- Exhibit --

Refer to the exhibit.

Users report that a web application works incorrectly. Sometimes contextual data displayed on the web pages is accurate; other times it is inaccurate.

The LTM administrator looks at the connection table with a filter on one of the client IP addresses currently connected using the command "tmsh show sys connection cs-client-addr 10.0.20.1" with the following results:

10.0.20.1:60048 10.0.20.88:80 10.0.20.1:60048 172.16.20.1:80 tcp 3 (tmm: 0)

10.0.20.1:60050 10.0.20.88:80 10.0.20.1:60050 172.16.20.3:80 tcp 3 (tmm: 0)

10.0.20.1:60047 10.0.20.88:80 10.0.20.1:60047 172.16.20.2:80 tcp 3 (tmm: 0)

10.0.20.1:60049 10.0.20.88:80 10.0.20.1:60049 172.16.20.1:80 tcp 3 (tmm: 0)

What is the solution to the problem?

Synchronize the clock of the LTM device with NTP.

Modify the load balancing method attached to the pool.

Set up an HTTP cookie insert profile in the virtual server.

Modify the setup of the monitor bound to the pool used by the application.

Correct Answer: C

The issue described is indicative of a session persistence problem. In the given configuration, the load balancing method used is 'least-connections-member,' which can result in requests from the same client being distributed to different pool members. This behavior can lead to inconsistencies in the contextual data displayed to users. Setting up an HTTP cookie insert profile on the virtual server will ensure that a user's session is consistently routed to the same pool member, thereby maintaining the consistency of contextual data across web pages. This solution addresses the root cause of the problem effectively.

Discussion

GVKDOption: C

C - Correct