Which of these statements is correct regarding Stateful Switchover and Cisco Nonstop Forwarding?

Question

Options

• AUtilizing Cisco NSF in Layer 2 environments can reduce outages to one to three seconds.
• BUtilizing SSO in Layer 3 environments can reduce outages to one to three seconds.
• CDistribution switches are single points of failure causing outages for the end devices.
• DUtilizing Cisco NSF and SSO in a Layer 2 environment can reduce outages to less than one
• ENSF and SSO with redundant supervisors have the most impact on outages at the access layer.

• A
  2% (1)
• C
  2% (1)
• E
  96% (43)

Explanation

Stateful Switchover (SSO) and Cisco Nonstop Forwarding (NSF) are high-availability features used on devices with redundant supervisor modules. When deployed on distribution-layer switches, NSF and SSO allow the standby supervisor to take over seamlessly, keeping routing tables and forwarding state intact. This dramatically reduces outage time that would otherwise be experienced by connected access-layer devices-making Choice E correct. Choice A is incorrect-NSF is a Layer 3 feature; Layer 2 environments use SSO alone for near-zero failover, but the characterization '1–3 seconds' for NSF in Layer 2 is inaccurate. Choice B is incorrect-SSO alone in Layer 3 is not sufficient; NSF is also required to maintain forwarding continuity during a supervisor switchover. Choice C is incorrect-distribution switches with redundant supervisors and NSF/SSO are NOT single points of failure. Choice D is incorrect-NSF/SSO benefits are in Layer 3 environments, not Layer 2.

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