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Zorluk: OrtaResilience, High Availability, and Redundancy

A security administrator is evaluating a high-availability perimeter firewall pair deployed in an active-passive failover configuration. During a scheduled failover simulation, the secondary appliance successfully assumed the virtual IP address and began handling traffic, but all active client TCP sessions were abruptly dropped, forcing users to re-authenticate. The administrator must update the architecture so that existing connection states persist uninterrupted across failover events. Which of the following solutions should the administrator implement?

  1. Stateful session synchronization across the cluster membersCevap
  2. B
    RAID 1 storage array mirroring across both physical appliances
  3. C
    An inline network intrusion detection system to monitor state transitions
  4. D
    Automated off-site configuration backups scheduled hourly

Cevap

Stateful session synchronization across the cluster members
Stateful session synchronization continuously transmits connection tracking data, NAT tables, and TCP state details across a dedicated heartbeat/sync interface between high-availability nodes. When the passive node assumes primary status, it already possesses the exact state of all active connections, enabling uninterrupted traffic flow without forcing clients to re-establish connections.

Adım Adım Çözüm

1
Analyze the observed issue during the active-passive firewall failover test.
The secondary node successfully acquired network ownership (virtual IP), but dropped active client TCP connections, indicating a lack of dynamic session state sharing.
Basic high availability virtual IP mechanisms (like VRRP or CARP) manage IP address migration but do not natively copy active memory tables across hosts.
2
Evaluate the architectural control required for seamless session persistence.
Stateful session synchronization must be configured over a dedicated sync link to continuously replicate session state tables.
This allows the backup appliance to track open TCP connections and immediately service existing client traffic without requiring session re-establishment.

Anahtar Kavram

Stateful Session Failover vs. Hardware Fault Tolerance
Tahmini Süre:1m 15s
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Konular

Resilience, High Availability, and Redundancy

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