Which of the following are valid statements when configuring Nonstop Forwarding (NSF) with Stateful Switchover (SSO) on a Cisco device? (Choose two.)

Question

Options

• Asupports multicast routing protocols
• BSupports IPv4 and IPv6
• CNonstop Forwarding requires SSO to also be configured
• DHSRP is not supported with NSF/SSO
• EImproper implementation of NSF/SSO can result in routing loops

• A
  4% (2)
• B
  2% (1)
• C
  93% (50)
• E
  2% (1)

Explanation

NSF/SSO Configuration – Explanation

Why C and D are correct: NSF (Nonstop Forwarding) requires SSO to be configured first, as SSO provides the stateful synchronization between active and standby route processors that NSF depends on to continue forwarding traffic during a switchover - they work as a mandatory pair. HSRP is indeed not supported with NSF/SSO because HSRP is a first-hop redundancy protocol that operates independently and conflicts with the NSF/SSO redundancy model.

Why the distractors are wrong:

• A is incorrect because NSF/SSO does not support multicast routing protocols - it is limited to unicast routing protocols like OSPF, EIGRP, BGP, and IS-IS.
• B is incorrect because NSF/SSO only supports IPv4, not IPv6 (IPv6 has its own separate nonstop forwarding mechanisms).
• E is incorrect because while NSF/SSO implementation requires care, routing loops are not a standard documented risk of improper implementation - this is a distractor designed to sound plausible.

Memory Tip: Think of NSF/SSO like a relay race - SSO hands the baton (state information) to NSF, so NSF cannot run without SSO passing it first. Also remember: "No HSRP allowed" because NSF/SSO handles redundancy its own way.

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