Which statement is true concerning cookie persistence?
A.
Cookie persistence allows persistence independent of IP addresses.
B.
Cookie persistence allows persistence even if the data are encrypted from client to pool member.
C.
Cookie persistence uses a cookie that stores the virtual server, pool name, and member IP address in clear text.
D.
If a client's browser accepts cookies, cookie persistence will always cause a cookie to be written to the client's file system.
The Answer Is:
A
This question includes an explanation.
Explanation:
Cookie Persistenceis a Layer 7 persistence method that leverages an HTTP cookie to track a user session.
IP Independence:Unlike "Source Address Affinity" (which relies on the client's IP), Cookie persistence identifies the session base16d on a unique token provided by the BIG-IP system. This is crucial for environments where many users share a single gateway (NAT) or where a client's IP might change mid-session.
Encryption and Decryption:For the BIG-IP to insert or read a cookie, itmustbe able to see the HTTP header. If the traffic is encrypted end-to-end (SSL Pass-through), the BIG-IP cannot use cookie persistence. SSL must be terminated at the BIG-IP (Option B is false).
Security:By default, BIG-IP cookies are encoded, not clear text. Modern versions allow for easy encryption of these cookies to prevent information leakage (Option C is false).
Memory vs. Disk:The default behavior is "session-based" (In-memory). A cookie is only written to the client's file system (disk) if anExpirationis configured in the persistence profile (Option D is false).
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