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?

A.
HSRP

B.
VSS

C.
Spanning Tree Protocol

D.
EtherChannel

Explanation:
Virtual Switching System (VSS)
A VSS is network system virtualization technology that pools multiple Cisco ® Catalyst ® 6500 Series Switches into one virtual switch, increasing operational
efficiency, boosting nonstop communications, and scaling system bandwidth capacity to 1.4 Tbps. At the initial phase, a VSS will allow two physical Cisco Catalyst
6500 Series Switches to operate as a single logical virtual switch called a virtual switching system 1440 (VSS1440). (See Figure 1.)