350-401 Question #986: Real Exam Question with Answer & Explanation

Question

Which technology enables a redundant supervisor engine to take over when the primary supervisor engine fails?

Options

• ASSO
• BFHRP
• Cgraceful restart
• DNSF

Explanation

SSO (Stateful Switchover) is the technology specifically designed to allow a redundant (standby) supervisor engine to seamlessly take over all functions when the primary supervisor engine fails in a chassis-based switch. SSO synchronizes the state information between the active and standby supervisors in real time, so the switchover happens with minimal or no disruption to network traffic.

Why the distractors are wrong:

• FHRP (First Hop Redundancy Protocol) - such as HSRP or VRRP - provides gateway redundancy for end devices, not supervisor engine failover within a single chassis.
• Graceful Restart is a routing protocol feature that allows a restarting router to maintain forwarding during a protocol restart, but it doesn't manage the physical switchover between supervisor engines.
• NSF (Non-Stop Forwarding) works alongside SSO to maintain packet forwarding during a switchover, but NSF alone does not perform the actual supervisor engine takeover - SSO is the mechanism that triggers and manages the handoff.

Memory Tip: Think of SSO = Supervisor Switchover - the word "Supervisor" is hidden in the concept, reminding you it's the technology tied directly to supervisor engine redundancy within a chassis.

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