A network engineering team is executing a disaster recovery failover plan to restore operations at a secondary data center following a catastrophic failure at the primary site. Arrange the recovery actions in the correct sequential order based on standard network and infrastructure service dependencies, from first to last.
- 1Establish foundational layer 2 switching and layer 3 routing infrastructure at the disaster recovery site.
- 2Restore core infrastructure and directory services, including Active Directory, internal DNS, and DHCP.
- 3Recover backend database storage volumes and line-of-business application servers from backups.
- 4Perform validation and synthetic testing to verify data integrity and service functionality.
- 5Update external DNS records and edge gateway routing to cut over client traffic to the secondary site.
Cevap
The correct order of steps is: 1) Establish foundational layer 2 switching and layer 3 routing infrastructure, 2) Restore core infrastructure and directory services (Active Directory, internal DNS, DHCP), 3) Recover backend database storage volumes and application servers, 4) Perform validation and synthetic testing to verify data integrity, and 5) Update external DNS records and edge gateway routing to cut over client traffic.
Disaster recovery failovers must adhere strictly to infrastructure dependency order. Underlying network switching and routing must be restored first to enable inter-subnet communication. Next, core directory and name resolution services (Active Directory, DNS, DHCP) must be brought online so that subsequent hosts can resolve IP endpoints and authenticate. Once directory services exist, application and database servers can be restored and booted. Comprehensive validation testing is conducted prior to production exposure. Finally, external DNS records and edge routing are updated to direct live client traffic to the recovered site.
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Anahtar Kavram
Disaster Recovery Infrastructure Dependency Sequence