101 · Question #317
Which of the following statements about cookie persistence is NOT true?
The correct answer is D. Web servers must be configured to send cookies to clients. Cookie persistence on F5 BIG-IP works by having the LTM insert cookies into HTTP responses itself, requiring no web server configuration. The statement that web servers must be configured to send cookies is the false one.
Question
Which of the following statements about cookie persistence is NOT true?
Options
- AThe cookie's timeout value can be customized.
- BThey are F5'spreferred persistence method.
- CNo persistence information is placed on LTM.
- DWeb servers must be configured to send cookies to clients.
- EThey do not add a performance impact on LTM.
How the community answered
(20 responses)- B5% (1)
- D90% (18)
- E5% (1)
Why each option
Cookie persistence on F5 BIG-IP works by having the LTM insert cookies into HTTP responses itself, requiring no web server configuration. The statement that web servers must be configured to send cookies is the false one.
Cookie persistence profiles allow administrators to set a custom expiration or timeout value for the cookie, making this statement true.
Cookie persistence is F5's recommended and preferred method because it offloads state tracking to the client, making this statement true.
Because session state is encoded inside the cookie carried by the client, the LTM does not maintain a persistence table entry, making this statement true.
In Insert mode, the BIG-IP LTM injects the persistence cookie directly into the HTTP response on behalf of the pool member, completely transparently to the server. The web server requires no special cookie configuration because the LTM handles all cookie insertion autonomously. This makes statement D factually incorrect and therefore the answer to what is NOT true.
Since the LTM does not store or look up persistence records for cookie-based sessions, there is negligible performance overhead on the LTM, making this statement true.
Concept tested: F5 BIG-IP cookie persistence Insert mode behavior
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