Cisco Updated 300-610 Exam Questions and Answers by aden

IEEE 802.1AX and the earlier IEEE 802.3ad specification identify link aggregation controlled through LACP. Cisco documents that LACP bundles multiple physical Ethernet interfaces into one logical port channel. A virtual port channel extends that model across two Cisco Nexus peer switches, allowing the attached device to form one standards-based logical channel while the physical members terminate on separate switches. The design increases usable aggregate bandwidth, permits hashing of independent flows across member links, and preserves connectivity after a link or peer-switch failure. Those characteristics address both throughput and resilience without replacing the existing PFC and jumbo-frame configuration. PFC protects selected traffic classes from congestion loss but does not create additional link capacity. Jumbo frames reduce per-packet overhead but likewise do not aggregate bandwidth. DCBX with Enhanced Transmission Selection can negotiate data-center bridging parameters and allocate bandwidth among traffic groups; it manages contention rather than adding physical forwarding capacity. Hierarchical QoS prioritizes and shapes classes but cannot eliminate an undersized aggregate link. Upgrading individual links could increase raw capacity, but Option C is not the action tied to the IEEE link-aggregation standards explicitly cited in the question. vPC with LACP is therefore the intended standards-aligned solution: it combines multiple links, uses the available bandwidth more effectively, and removes a single-switch attachment failure domain while presenting a single logical port channel to the connected system. Cisco Nexus LACP and port-channel configuration guide

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A single VRF in the common tenant removes the route duplication created by leaking prefixes among many tenant VRFs. In ACI, a VRF is a Layer 3 forwarding and policy domain, and objects placed in the common tenant can be consumed by user tenants. By attaching the relevant bridge domains and tenant application constructs to one shared common-tenant VRF, the fabric programs each reachable prefix in one routing context instead of replicating provider and consumer routes across numerous VRFs. This directly addresses the stated prefix-capacity pressure and eliminates the inter-VRF route-leaking machinery used only to provide communication between otherwise separate routing tables. Tenant-level security can still be enforced through EPGs, endpoint security groups, contracts, and filters even when the forwarding context is shared. The management tenant is reserved for ACI management connectivity and is not the correct location for production application routing. Options B and C preserve multiple VRFs and route leaking, so they retain the scaling problem rather than solve it. The single-common-VRF design is valid only when the tenants use nonoverlapping addressing and do not require hard routing-table isolation; overlapping prefixes or regulatory isolation would require separate VRFs and a different scale strategy. Under the question’s explicit goal of simplifying the architecture and reducing programmed prefixes, however, consolidating into one common-tenant VRF is the only option that removes the underlying source of route replication. Cisco ACI common-tenant sharing design

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