Which statements are valid regarding Nonstop Forwarding (NSF) with Stateful Switchover (SSO)? (Choose two.)
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Correct answer: Nonstop Forwarding requires SSO to also be configured, HSRP is not supported with NSF/SSO.
Why this is the answer
Nonstop Forwarding (NSF) relies on Stateful Switchover (SSO) to maintain forwarding state information during a route processor (RP) switchover. SSO ensures that the standby RP is fully synchronized with the active RP's forwarding information, allowing NSF to continue forwarding traffic without interruption. Therefore, NSF cannot operate without SSO. HSRP (Hot Standby Router Protocol) is a first-hop redundancy protocol that does not integrate with NSF/SSO for stateful failover. While NSF/SSO focuses on maintaining routing and forwarding states within a single device during an internal component failure, HSRP provides redundancy between multiple devices at the first hop. Multicast routing protocols are generally supported with NSF/SSO, and NSF/SSO aims to prevent routing disruptions, not cause loops. IPv4 and IPv6 are both supported.
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