Cisco 300-420 Exam With Confidence Using Practice Dumps

A migration from traditional IP-VPN service to Cisco SD-WAN commonly increases security and scalability. Cisco SD-WAN builds encrypted data-plane tunnels across supported transports, so the enterprise can use Internet, MPLS, or hybrid connectivity while maintaining secure site-to-site communication. The architecture also scales better operationally because policy, templates, onboarding, and routing control are centralized through the SD-WAN controllers and management plane. Increased solution complexity is not a desired characteristic; one of the design goals is to simplify operations through automation and centralized policy. Centralized application policies are also a major SD-WAN benefit, but when only two choices are selected, the stored answer emphasizes the two broad migration outcomes of security and scale. Distributed control plane is not correct because Cisco SD-WAN uses centralized control-plane logic with vSmart controllers distributing OMP routes and policies. A professional migration plan should validate transport diversity, controller redundancy, encryption policy, application-aware routing, and operational readiness. Reference topics: Cisco SD-WAN migration, encrypted overlay, scalability, centralized control plane, IP-VPN replacement.

Bidirectional PIM is the correct multicast protocol for this many-to-many financial application. The question states that most multicast sources also receive multicast traffic and that the design must not use source trees. Cisco describes BIDIR-PIM as a multicast mode built for many-to-many applications that use a shared tree rooted at the rendezvous point and avoid per-source shortest-path trees. This reduces multicast state because routers do not maintain separate source/group state for every active sender. PIM Sparse Mode can start with a shared tree, but it can switch to source trees, which violates the stated requirement. PIM-SSM is explicitly source-specific and requires receiver knowledge of the source, so it is not appropriate for a many-to-many model where source trees are disallowed. MSDP is not a multicast forwarding mode; it is used for source discovery between PIM-SM domains. The option text contains a spelling error, but the intended answer is BIDIR-PIM. The architect should verify RP placement, Designated Forwarder behavior, group ranges, and whether the application can tolerate shared-tree forwarding rather than shortest-path source trees. Reference topics: BIDIR-PIM, many-to-many multicast, shared tree, source-tree avoidance, multicast scaling.

L2VPN is the correct solution because the customer requires point-to-point connectivity while preserving existing VLAN infrastructure. Cisco describes Layer 2 VPN services as emulating Layer 2 connectivity across a provider IP or MPLS backbone, commonly through Ethernet pseudowires or VPWS. This allows sites such as dispersed data centers and a colocation facility to exchange Ethernet frames as if they were directly connected at Layer 2. The design is especially useful when data center synchronization, backup workflows, or application dependencies require VLAN continuity or minimal changes to existing addressing and routing. L3VPN would provide routed connectivity and VRF separation, but it would not preserve the VLAN-based service model. GRE would add an overlay tunnel but would not natively provide provider-managed Layer 2 service. DMVPN is designed for scalable Layer 3 IPsec/GRE overlays between branches, not for VLAN extension or point-to-point data center interconnect. Reference topics: L2VPN, VPWS, Ethernet pseudowire, VLAN extension, data center interconnect, WAN service design.