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Cisco Catalyst SD-WAN Cloud OnRamp is built to simplify and automate cloud connectivity from enterprise sites. Cisco describes the feature as a way to simplify connecting on-premises environments to cloud-hosted applications and workloads while extending SD-WAN policy into the cloud. The key design value is automation: branches and data centers can connect to SaaS, IaaS, or multicloud resources without manually building every tunnel, route policy, and cloud attachment. That is why option D is the strongest answer. Option A is too broad because generic transport independence is a core SD-WAN value, not the specific purpose of Cloud OnRamp. Option B confuses Cloud OnRamp with application-aware routing policy. Option C describes a business outcome, but the operational purpose tested here is automated on-premises-to-cloud integration and consistent policy extension. Reference topics: Cisco Catalyst SD-WAN Cloud OnRamp, multicloud connectivity, cloud workload access, SD-WAN fabric extension, automated cloud onboarding.

The branch router should advertise the local LAN with the EIGRP network command and make the LAN-facing interface passive. A passive interface allows the connected network to be included in EIGRP advertisements while suppressing EIGRP hello packets and neighbor formation on that interface. This is exactly what the engineer needs: remote EIGRP neighbors learn the LAN subnet, but unnecessary multicast EIGRP messages are not sent onto the user LAN where no EIGRP neighbors should exist. Replacing EIGRP with a static default route would not meet the requirement to advertise the local LAN through EIGRP. Redistributing connected routes can work, but it is less clean for a simple LAN interface and can introduce external-route behavior or policy complexity. Advertising the subnet as a stub network does not suppress multicast hellos on the LAN interface by itself. Cisco design best practice is to use passive interfaces on LAN-facing interfaces that should be advertised but should not form routing adjacencies. Reference topics: EIGRP passive interface, network statements, branch routing, unnecessary neighbor prevention, multicast control traffic.

Cisco SD-Access LAN automation deploys IS-IS as the underlay routing protocol to build node-to-node adjacencies automatically. The underlay must provide stable IP reachability between fabric nodes before the overlay control plane and VXLAN data plane can operate correctly. Cisco SD-Access design guidance uses an automated routed access underlay in which point-to-point links are discovered and provisioned, and IS-IS is used to advertise infrastructure reachability. This approach reduces manual configuration, accelerates brownfield or greenfield onboarding, and creates a consistent transport foundation for the fabric. LISP is used in the SD-Access control plane for endpoint mapping, not for building underlay adjacencies. VXLAN is the overlay data-plane encapsulation and does not establish routing adjacencies. OSPF can be used in some routed networks, but LAN automation for SD-Access uses IS-IS as the automated underlay protocol. Reference topics: SD-Access LAN automation, routed underlay, IS-IS underlay, fabric node discovery, Cisco Catalyst Center automation.

Easy Virtual Network is the best fit when a campus needs many Layer 3 virtual networks with separate addressing and routing tables but wants lower operational overhead than manually configuring VRF-Lite everywhere. EVN builds on VRF concepts and simplifies virtualization across a hop-by-hop campus design by reducing repetitive configuration and enabling consistent virtual network transport across participating devices. Each virtual network maintains its own routing context, which supports overlapping addressing and segmentation. Hop-by-hop VRF-Lite can provide similar forwarding separation, but it becomes operationally heavy as the number of VRFs grows because each trunk, routing process, and interface association must be configured and maintained manually. Multihop MPLS can scale, but it introduces provider-style complexity and may require features or skills beyond a typical campus requirement. Multihop IPsec tunneling is not an efficient campus segmentation solution for hundreds of virtual networks. Therefore, EVN is the recommended design for scalable Layer 3 virtualization with simpler configuration and management. Reference topics: campus virtualization, Easy Virtual Network, VRF separation, scalable virtual networks, route isolation.

Stateful NAT64 is the correct design because IPv6-only hosts must communicate with legacy IPv4 devices and only a small pool of IPv4 addresses is available for concurrent sessions. NAT64 translates IPv6 client traffic into IPv4 traffic, allowing IPv6-only endpoints to reach IPv4-only resources. A stateful implementation maintains translation state and can use a pool of IPv4 addresses for multiple IPv6 clients, which fits the requirement for up to 10 concurrent IPv6 hosts using 10 reserved IPv4 addresses. Static NAT- PT would require fixed one-to-one mappings and is less suitable for a pool-based concurrent access model. NAT66 translates between IPv6 prefixes and does not solve access to IPv4-only devices. Dynamic NAT-PT is an older transition mechanism and is not the preferred modern answer when NAT64 is available. The design should also include DNS64 when clients access IPv4-only services by name. Reference topics: IPv6 transition, stateful NAT64, DNS64, IPv6-only hosts, IPv4 legacy reachability.

Redundancy for Cisco vBond Orchestrators is normally achieved by mapping the IP addresses of multiple vBond instances to a single DNS name. WAN Edge devices use the configured organization name and vBond DNS name during onboarding to resolve and contact an available orchestrator. This design allows several vBond nodes to be deployed across different locations or availability zones while giving the edge device a consistent bootstrap target. If one vBond is unavailable, DNS resolution can return another reachable vBond address, allowing control-connection orchestration to continue. Selecting only the closest vBond is not the redundancy mechanism described here, and deploying a single vBond creates an avoidable single point of failure. The answer that says WAN Edge routers are configured with all orchestrators by IP address and priority does not represent the common DNS-based design model. In production, the DNS record, certificates, firewall policy, NAT behavior, and controller reachability should all be validated so that WAN Edge devices can reach multiple vBond instances during onboarding and after failures. Reference topics: Cisco SD-WAN controller redundancy, vBond DNS, device onboarding, orchestration availability.

For point-to-point telepresence, asymmetric routing can create delay variation, packet reordering, and troubleshooting complexity. The design requirement is to make egress and ingress flows follow the same path. In the topology, the best way to steer traffic away from the less desirable return path is to configure a higher metric on the router in area 4 so OSPF path selection favors the symmetric path. OSPF chooses paths based on cumulative cost, and increasing the cost on the unwanted path makes the preferred path more attractive without removing redundancy. Route leaking on the routers in area 1 or area 2 would introduce additional interarea route visibility but would not necessarily solve the asymmetric flow problem. A route filter in area 4 could remove reachability or create suboptimal failure behavior rather than simply preferring the right path. Raising the metric is a cleaner design technique because it preserves backup reachability while influencing normal forwarding. Reference topics: OSPF cost design, symmetric routing, telepresence traffic, interarea path optimization, metric engineering.

Dual DMVPN with EIGRP routing is the correct solution because the requirements call for secure public-internet connectivity, redundant paths, automatic path selection, multicast support, and minimal remote-site configuration. DMVPN builds dynamic multipoint GRE tunnels protected by IPsec, allowing spoke sites to communicate securely through the public internet while supporting routing protocols and multicast over GRE. A dual DMVPN design provides redundancy through separate hubs, transports, or tunnel clouds, so a spoke can continue operating if one path fails. EIGRP can calculate alternate paths and react to metric changes, supporting automatic path selection based on failure and quality when engineered correctly. MPLS with BGP does not meet the public-internet and encryption requirements by itself. A full mesh of IPsec tunnels with OSPF or IS-IS would increase configuration complexity at every remote site and does not scale as well. DMVPN is specifically built to simplify deployment of secure, scalable, multipoint branch VPNs. Reference topics: DMVPN, IPsec, mGRE, EIGRP over DMVPN, WAN redundancy, multicast over GRE.

This YANG mapping is based on how IETF, OpenConfig, and Cisco native models differ in portability and schema organization. IETF models are produced through the standards process and are appropriate when the same management structure is expected across vendors for common protocols. OpenConfig models are also vendor-neutral, but they are built around a consistent operational model used heavily for streaming telemetry and multivendor automation. Cisco native models mirror Cisco platform configuration more closely and expose device-specific capabilities that may not exist in common models. The selected answers keep those boundaries clear. This matters because a NETCONF or RESTCONF payload is validated against the YANG schema; a payload written for one model family cannot be assumed to work against another. In design terms, the model family should be selected after confirming device software release support, feature coverage, operational-state requirements, and vendor diversity. Open models give portability; native models give feature completeness. Reference topics: IETF YANG, OpenConfig YANG, Cisco native YANG, schema validation, automation model selection.

The selected IPv6 summary must be the smallest prefix that covers all of the site subnets in the exhibit while not including unnecessary additional networks. IPv6 route summarization works by identifying the common high-order bits shared by the component prefixes and advertising the shortest aggregate that contains them all. Cisco routing design uses summarization at WAN or aggregation boundaries to reduce routing-table size, contain convergence events, and simplify policy. Option C is retained because it represents the aggregate identified by the exhibit answer set. Option A is a different /60 boundary and would be correct only if all component subnets fell under that exact nibble range. Option B is not a usable summary route in normal IPv6 prefix notation as written. Option D is too broad or malformed for a precise site summary. The professional design rule is to summarize on valid nibble or bit boundaries and verify that every component prefix is included without accidentally absorbing unrelated site networks. Reference topics: IPv6 summarization, prefix aggregation, route boundary calculation, WAN route scale, convergence containment.