Cisco CDCNID Cisco Data Center Networking Infrastructure Design Set 4

16 Gbps ✘ 20 Gbps ✘ 32 Gbps ✘ 40 Gbps ✔ 48 Gbps ✔

They are routed to provide increased fault-tolerance and smaller STP domains. ✘ They are routed to provide load-balancing services between web and application servers. ✘ They are routed because individual access modules cannot scale to large HPC deployments. ✘ Server-to-server traffic flows should never be routed through the aggregation layer. ✔

Layer 2 provides faster convergence than Layer 3. ✘ Layer 2 STP path blocking should always be used. ✘ Layer 2 domains should be limited to point-to-point. ✘ Layer 2 should not be used in the core layer. ✔

NAC ✘ private VLANs ✘ IP Source Guard ✘ unicast MAC filtering ✔

MPI ✘ access ✘ private ✘ storage ✔

Layer 3 ✘ InfiniBand ✘ Layer 2 loop-free ✘ Layer 2 looped square ✔ Layer 2 looped triangle ✔

fewer links ✘ better fault isolation ✘ more frequent switch upgrades ✘ simplified routing-protocol peering ✔