The requirement for high availability within the Data Center network may cause the designer to consider which one of the following solutions?

Question

Options

• AConstruct a hierarchical network design using EtherChannel between a server and two VDCs
• BUtilize Cisco NSF with SSO to provide intrachassis SSO at Layers 2 to 4
• CDefine the Data Center as an OSPF NSSA area, advertising a default route into the DC and
• DImplement network services for the Data Center as a separate services layer using an

• A
  8% (3)
• B
  73% (27)
• C
  3% (1)
• D
  16% (6)

Explanation

Cisco Non-Stop Forwarding (NSF) combined with Stateful Switchover (SSO) allows a device with dual supervisor engines to switch over to the standby supervisor without dropping traffic or clearing forwarding state. SSO synchronizes Layer 2 and Layer 3 state between the active and standby supervisors, while NSF enables the forwarding plane to continue operating during the control-plane switchover. This is a primary high-availability mechanism within a single chassis in the Data Center. EtherChannel between a server and two VDCs (A) is architecturally incorrect since VDCs reside in the same chassis. OSPF NSSA (C) is a routing design choice unrelated to HA. A separate services layer (D) is an architectural pattern, not a specific HA solution.

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