201 · Question #351
Which two statements are true concerning the default communication between a redundant pair of BIG-IP 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. For redundant BIG-IP systems, connection mirroring and persistence mirroring data, which are vital for maintaining active sessions and client-server persistence during failover, are shared over a TCP connection using port 1028 by default. This ensures stateful failover.
Question
Which two statements are true concerning the default communication between a redundant pair of BIG-IP 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
How the community answered
(28 responses)- A4% (1)
- B93% (26)
- D4% (1)
Why each option
For redundant BIG-IP systems, connection mirroring and persistence mirroring data, which are vital for maintaining active sessions and client-server persistence during failover, are shared over a TCP connection using port 1028 by default. This ensures stateful failover.
Configuration synchronization (ConfigSync) between BIG-IP systems typically uses TCP port 443 (HTTPS) for secure communication, not ports 683 and 684.
Connection mirroring data, which includes the state of active client connections, is transmitted between BIG-IP devices via a TCP connection using port 1028 by default to allow for seamless failover without interrupting active sessions.
Persistence mirroring data, which maintains the client-server relationship for load balancing decisions, is also shared between BIG-IP systems over a TCP connection using port 1028 by default to ensure consistent routing post-failover.
Connection mirroring data is shared over a network connection, typically the management or self-IP network, and not through the serial failover cable, which is primarily used for heartbeat and failover signals.
Concept tested: F5 BIG-IP HA communication ports
Source: https://support.f5.com/csp/article/K16715
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