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300-320 · Question #169

A campus network in a switch block design requires redundant distribution switches, load sharing across uplinks, a loop-free topology, and only one gateway IP address per VLAN. Which switching…

The correct answer is B. VSS. Virtual Switching System (VSS) combines two physical Catalyst 6500/6800 switches into a single logical switch. Because both chassis share one control plane, active-active load sharing across all uplinks is native (via Multichassis EtherChannel), the topology is loop-free…

Advanced Enterprise Campus Networks

Question

A campus network in a switch block design requires redundant distribution switches, load sharing across uplinks, a loop-free topology, and only one gateway IP address per VLAN. Which switching technology meets all of the requirements?

Options

  • AHSRP
  • BVSS
  • CSpanning Tree Protocol
  • DEtherChannel

How the community answered

(46 responses)
  • A
    4% (2)
  • B
    80% (37)
  • C
    4% (2)
  • D
    11% (5)

Explanation

Virtual Switching System (VSS) combines two physical Catalyst 6500/6800 switches into a single logical switch. Because both chassis share one control plane, active-active load sharing across all uplinks is native (via Multichassis EtherChannel), the topology is loop-free without STP intervention between the VSS members, and only one gateway IP per VLAN is needed because the VSS appears as one device. HSRP provides a virtual gateway IP but only one router is active at a time per VLAN, preventing true active-active load sharing without additional complexity. Spanning Tree Protocol ensures a loop-free topology but blocks redundant paths, sacrificing load sharing. EtherChannel aggregates links on a single switch but does not address multi-chassis redundancy or single-gateway requirements by itself.

Topics

#VSS#campus redundancy#gateway consolidation#load sharing

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