201 · Question #91
Which two statements are true concerning the default communication between a redundant pair of BIGIP systems. (Choose two.)
The correct answer is B. Connection mirroring data is shared via a TCP connection using port 1028. C. Persistence mirroring data is shared via a TCP connection using port 1028. Connection mirroring and persistence mirroring data are both shared between redundant BIG-IP systems via a TCP connection, typically using port 1028 by default, to maintain session continuity during a failover event.
Question
Which two statements are true concerning the default communication between a redundant pair of BIGIP systems. (Choose two.)
Options
- ASynchronization occurs via a TCP connection using ports 683 and 684.
- BConnection mirroring data is shared via a TCP connection using port 1028.
- CPersistence mirroring data is shared via a TCP connection using port 1028.
- DConnection mirroring data is shared through the serial fail over cable unless network failover is enabled.
How the community answered
(33 responses)- A3% (1)
- B91% (30)
- D6% (2)
Why each option
Connection mirroring and persistence mirroring data are both shared between redundant BIG-IP systems via a TCP connection, typically using port 1028 by default, to maintain session continuity during a failover event.
Synchronization for configuration occurs over HTTPS (port 443) by default, and ports 683/684 are not standard for general synchronization or mirroring.
Connection mirroring data is shared over a TCP connection on port 1028 (by default) to ensure that the standby BIG-IP system has current information about active connections. This allows the standby unit to take over existing client connections seamlessly if the active unit fails.
Persistence mirroring data is also shared over a TCP connection, typically using the same port 1028, to synchronize persistence records (e.g., source IP, cookie, SSL session IDs). This ensures that if a failover occurs, the new active unit can maintain client-to-server affinity for ongoing sessions.
The serial failover cable is used for fast, direct failover communication (heartbeats and state changes), not for mirroring large amounts of connection or persistence data, which is handled over the network.
Concept tested: F5 BIG-IP Connection and Persistence Mirroring
Source: https://techdocs.f5.com/en-us/bigip-16-1-0/big-ip-system-high-availability-and-load-balancing-configuration/enabling-connection-and-persistence-mirroring.html
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