In a Cisco Catalyst switch equipped with two supervisor modules an administrator must temporally remove the active supervisor from the chassis to perform hardware maintenance on it. Which mechanism en

Question

Options

• ANSF/NSR
• BSSO
• CHSRP
• DVRRP

• B
  91% (29)
• C
  3% (1)
• D
  6% (2)

Explanation

SSO (Stateful Switchover) Explanation

SSO (Stateful Switchover) is correct because it is the mechanism that synchronizes state information between the active and standby supervisor modules in real time, allowing the standby supervisor to instantly take over all switching functions when the active supervisor is physically removed - with no disruption to network traffic or forwarding.

Why the distractors are wrong:

• NSF/NSR (A) works alongside SSO to maintain routing protocol adjacencies during a switchover, but it is not the mechanism that directly handles the physical supervisor redundancy and seamless takeover itself.
• HSRP (C) is a gateway redundancy protocol that provides default gateway failover between multiple routers/Layer 3 devices - it operates at the network level, not within a single chassis.
• VRRP (D) is also a gateway redundancy protocol (an open-standard alternative to HSRP) and similarly has nothing to do with intra-chassis supervisor redundancy.

Memory Tip: Think of SSO = "Same Switch Over" - it keeps everything synchronized within the same physical chassis, so swapping supervisors feels invisible to the network. If the question involves two supervisors in one chassis, the answer is almost always SSO.

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