MSDP should be enabled between the Anycast RP routers using separate unique loopback interfaces. In a PIM Anycast RP design, multiple RPs share the same RP address so multicast routers can reach the topologically closest RP through normal unicast routing. That shared RP address gives redundancy and load sharing, but it also creates a source-discovery problem: a source registered to RP1 must be known by RP2 so receivers using RP2 can join the same multicast stream. Cisco Anycast RP designs solve this by running MSDP between the RPs. The MSDP peerings should use unique loopback addresses, not the shared Anycast RP address, because each router must have an individually reachable identity for the MSDP session. Extending the RP subnet at Layer 2 between data centers is unnecessary and poor design. Using the configured Anycast RP address for MSDP creates ambiguity because both routers advertise the same address. Doing nothing would leave each RP aware only of locally registered sources. Reference topics: Anycast RP, MSDP, PIM sparse mode, source-active exchange, multicast RP redundancy.

For multimedia conferencing over MPLS, Cisco QoS design normally classifies the traffic into the multimedia conferencing class and marks it with AF4, commonly AF41. This class is intended for interactive video conferencing and similar applications that need assured bandwidth and controlled loss, but that are not usually placed in the same strict-priority class as voice bearer traffic. A bandwidth queue provides a minimum bandwidth guarantee during congestion, while DSCP-based WRED can selectively manage congestion within the class by using the drop precedence encoded in the AF marking. AF3 is generally associated with multimedia streaming, not interactive conferencing. A simple bandwidth queue without WRED does not fully use per-hop behavior characteristics for congestion handling. LLQ is typically reserved for voice and sometimes very tightly controlled real-time classes, because overusing strict priority can starve other traffic. Therefore, bandwidth queuing with DSCP WRED using AF4 is the appropriate per-hop behavior design. Reference topics: Cisco QoS baseline, DiffServ, AF41, multimedia conferencing, MPLS QoS, WRED.

The configuration-protocol mapping distinguishes NETCONF and RESTCONF behavior in model-driven programmability. NETCONF is an XML-based network configuration protocol that runs over a secure transport such as SSH and supports structured operations such as get-config, edit-config, lock, unlock, commit, and datastore manipulation. It is well suited to transactional configuration workflows where candidate and running datastores are supported. RESTCONF exposes YANG-modeled data through a REST-style interface over HTTP or HTTPS, using familiar methods such as GET, POST, PUT, PATCH, and DELETE. It can encode data in XML or JSON depending on headers and implementation. Both protocols use YANG models to define the structure and semantics of configuration and operational data, but they differ in transport style, operation model, and tooling. The selected mapping therefore places NETCONF characteristics with the protocol that provides RPC-style operations and datastore handling, while RESTCONF receives HTTP method and URI-based characteristics. In design, the choice depends on controller support, device operating system, required transaction semantics, security policy, and developer tooling. Reference topics: NETCONF, RESTCONF, YANG, datastores, XML and JSON encoding.

Dial-In: collector initiates a session to the device; supports gRPC only. Dial-Out: device initiates a session to the collector; supports TCP, UDP, and gRPC.

Model-driven telemetry can be deployed in dial-in or dial-out mode, and the difference is which side initiates the session and where the subscription is controlled. In dial-in mode, the collector initiates the session to the network device and requests the telemetry subscription. This makes the collector responsible for establishing the session and asking for the data stream. In the context of the provided options, dial-in is paired with support for gRPC only. In dial-out mode, the network device initiates the session toward the collector according to a configured subscription. This is useful when devices sit behind NAT or when the operational model requires devices to push telemetry to a known collector. In the provided choices, dial-out is paired with support for TCP, UDP, and gRPC. The mapping is not arbitrary; it follows Cisco telemetry terminology, where dial-in is collector-initiated and dial-out is device-initiated. This distinction is important in network automation designs because firewall policy, collector scaling, and subscription lifecycle management differ between the two modes.

OpenConfig separates intended configuration from operational state by using separate config and state containers, while many IETF and Cisco native models use a single hierarchy for configuration and operational data or expose operational data differently. This distinction is important in automation because the client must know whether it is writing desired configuration or reading actual device state. OpenConfig’s structure was designed to provide consistent multivendor modeling, with configuration data placed under config containers and observed state under state containers. Cisco native models tend to mirror the Cisco device CLI and feature hierarchy more closely, while IETF models focus on standards-based interoperability. Option B correctly states the contrast presented in the question. Option A reverses the relationship. Option C incorrectly assigns split containers to IETF and native models. Option D incorrectly isolates Cisco native models as the only split-container style. Reference topics: YANG model structure, OpenConfig config and state containers, IETF YANG, Cisco native models, network automation data modeling.

Virtual networks in Cisco SD-Access provide macro segmentation. Macro segmentation separates major user, device, or service groups into distinct virtual networks, each with its own routing and forwarding context. This is comparable to VRF-based separation in traditional enterprise designs. For example, corporate users, guests, building systems, and IoT devices can be placed into separate virtual networks so their routing domains remain isolated unless controlled inter-VN communication is explicitly provided. Microsegmentation is different; it is normally enforced inside or across virtual networks using Security Group Tags and Security Group ACLs, allowing policy decisions based on group identity rather than only IP subnets or VLANs. Inter-VN describes communication between virtual networks, not the segmentation type itself. Stretched segmentation is not the standard SD-Access term. Therefore, the separation created by virtual networks is macro segmentation, while SGT-based policy provides finer-grained microsegmentation. Reference topics: Cisco SD-Access virtual networks, macro segmentation, VRF, SGT, microsegmentation, policy enforcement.

The selected configuration sets are correct because the addressing plan must use VLSM to maximize subnets and minimize wasted addresses. Customer A requires 125 hosts, so it needs a /25 subnet, which provides 126 usable host addresses. Customer D requires 62 hosts, so it needs a /26 subnet, which provides 62 usable addresses exactly. Point-to-point or small WAN links B, C, and E should use the smallest appropriate link subnets shown in the exhibit, typically /30 for IPv4 point-to-point links when two usable addresses are required. A correct plan must allocate the largest blocks first, align every subnet on the proper boundary, avoid overlap, and avoid assigning a larger-than-needed subnet to any customer or link. Options A and C are the two valid combinations that satisfy those rules in the exhibit. Any option that places a /25 or /26 on the wrong boundary, overlaps with another block, or wastes larger subnets on links would fail the design objective. Reference topics: IPv4 VLSM, subnet boundary alignment, host capacity planning, point-to-point addressing, route summarization readiness.

Cisco Catalyst SD-WAN separates orchestration from management, control, and data forwarding. The orchestration-plane function is provided by vBond, which authenticates WAN Edge devices and helps establish secure connectivity between edges and controllers. In Cisco design terms, vBond is also the NAT traversal facilitator because it allows devices sitting behind NAT to discover reachable public and private address information and form the correct control connections. These two functions match the options for primary authentication point and NAT traversal facilitation. Centralized provisioning, troubleshooting, monitoring, and template-based configuration belong to vManage, the management plane. Route and policy distribution belongs to vSmart, the control plane, through OMP. Zero Touch Provisioning is part of the onboarding workflow, but the question asks for orchestration-plane functions, not the broader provisioning service. A sound SD-WAN design should deploy redundant vBond instances, ensure DNS reachability to them, and validate firewall rules so DTLS/TLS control connections can be established reliably across Internet and private transports. Reference topics: Cisco SD-WAN architecture, vBond orchestration, control connections, NAT traversal.

The company must prevent itself from advertising routes learned from one ISP to the other ISP. If it receives full Internet tables from both providers and then re-advertises those learned prefixes, it can unintentionally become a transit autonomous system. The proper BGP design is to apply outbound route policy so only the company’s own originated prefixes are advertised to the ISPs, while routes learned from ISP1 are never advertised to ISP2 and routes learned from ISP2 are never advertised to ISP1. A route map or equivalent prefix filtering policy applied outbound to the ISP neighbors achieves that goal. Local preference influences outbound path selection inside the company AS; it does not prevent transit advertisements. MED influences how a neighboring AS may enter the company network, but it does not stop the company from advertising third-party routes. Tagging incoming routes with no-export is not as deterministic as simply filtering what is advertised to each provider and may still allow undesirable routing behavior within the directly connected provider. Therefore, the design should include outbound route filtering with a route map.

MSDP is the correct solution because the question explicitly references RFC 3618, which defines the Multicast Source Discovery Protocol. The design has separate PIM Sparse Mode multicast domains, with RP functions already configured on edge routers in each autonomous system. Cisco explains that MSDP allows rendezvous points in different PIM-SM domains to discover active multicast sources outside their local domain. When a source becomes active, the local RP can advertise source-active information to MSDP peers, allowing receivers in another domain to learn and join the stream. PIM-SSM is not correct because SSM removes the RP dependency and requires receivers to know the source directly. MP-BGP can carry multicast routing information, but it does not perform RP-to-RP source discovery. BIDIR-PIM is a multicast mode for many-to-many shared-tree forwarding, not an interdomain RP discovery mechanism under RFC 3618. Reference topics: MSDP, RFC 3618, PIM Sparse Mode, interdomain multicast, Source-Active messages, rendezvous points.