You are deploying an IP Fabric in your new data center. You need to ensure that your servers have multiple active/active links for redundancy and load balancing. What are two methods to accomplish…

Question

Options

• AUse EVPN with ESI at the access switch.
• BUse MSTP to enable multiple links on the access switch.
• CUse MC-LAG at the access switch.
• DUse PIM-SM to enable multicast across multiple links.

• A
  17% (3)
• B
  72% (13)
• D
  11% (2)

Explanation

NOT A because EVPN is specifically designed to handle multi-homed access redundancy, and mobility, and load-balancing is possible. I would not choose this though because EVPN is primarily a DCI protocol ?for interconnecting datacenters ?and is not typically considered an access layer protocol facing the servers. It is possible to use EVPN inside a single datacenter, in which case it would be used between the access switches and the distribution/core switches. In the spirit of the question however, this does not face the servers directly so I exclude it. B because MSTP allows for multiple spanning trees, which allows for use of all inter-switch links by, for example, aggregating VLANs into spanning trees ?eg: VLANs 1-100 in one tree, 101-200 in another. One spanning tree is active on a given link, the other is inactive. In this way load- balancing is achieved. In case of link failure, all traffic will fall to the remaining link(s). C because MC-LAG allows for link aggregation across multiple chasses -> permits load- balancing and provides redundancy. NOT D because PIM-SM is a control-plane signaling protocol for multicast which enables routers to join and prune their membership to given multicast distribution trees. It has little directly to do with the redundancy and load-balancing of (multicast) traffic receivers.

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