A network security administrator is enhancing default gateway availability for a critical transaction processing subnet. The design mandates that if the active border router suffers a hardware crash, internal client endpoints must maintain outbound connectivity automatically without requiring manual IP reconfiguration or workstation restarts. Which of the following controls best achieves this fault-tolerant requirement?
- Implement a First Hop Redundancy Protocol to share a virtual IP and MAC address across the routers.Answer
- BConfigure Multipath I/O across the router network interfaces to balance incoming host sessions.
- CSchedule automated hourly configuration backups of the active router to a remote repository.
- DEnable port security with dynamic MAC filtering on the access switches connected to the default gateways.
Answer
Implementing a First Hop Redundancy Protocol (FHRP) allows redundant routers to share a single virtual IP and MAC address, allowing transparent gateway failover for client endpoints.
First Hop Redundancy Protocols allow two or more physical routers to present a shared virtual IP address and virtual MAC address to local endpoints. If the active master router fails, a backup router assumes responsibility for traffic sent to the virtual IP without requiring changes to client network settings.
Step-by-Step Solution
Key Concept
First Hop Redundancy Protocols (FHRP)