350-401 Question #1339: Real Exam Question with Answer & Explanation

Question

How do FHRPs differ from SSO?

Options

• AFHRPs use OTV for redundancy, and SSO uses VXLAN for state synchronization.
• BFHRPs provide gateway redundancy, and SSO provides failover within a single device.
• CFHRPs influence bandwidth allocation, and SSO influences routing decisions.
• DFHRPs maintain state information within a single device, and SSO manages state information

Explanation

FHRPs vs. SSO Explained

Option B is correct because First Hop Redundancy Protocols (FHRPs) - such as HSRP, VRRP, and GLBP - provide gateway redundancy across multiple physical devices, presenting a single virtual IP/MAC to hosts so traffic continues if one router fails. Stateful Switchover (SSO), by contrast, operates within a single device (typically a dual-supervisor chassis), synchronizing control-plane state between active and standby supervisors so a switchover is seamless and nearly hitless.

Why the distractors are wrong:

• Option A is incorrect because OTV (Overlay Transport Virtualization) and VXLAN are data center interconnect/overlay technologies completely unrelated to FHRPs or SSO.
• Option C is incorrect because neither FHRPs nor SSO are designed to influence bandwidth allocation or routing decisions - those are functions of QoS and routing protocols, respectively.
• Option D reverses the concepts - SSO (not FHRPs) maintains synchronized state within a single device, while FHRPs coordinate state across multiple devices.

Memory Tip: Think of it this way - FHRPs = across routers (First Hop = your gateway), SSO = inside one box (Stateful Switchover = supervisor to supervisor). "F" for Far apart, "S" for Same chassis."

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