300-420 Exam Dumps : Designing Cisco Enterprise Networks

The primary capability of IaaS in this question is elastic scaling: the ability to increase or decrease infrastructure resources based on demand. In Infrastructure as a Service, the provider offers compute, storage, and network resources as an on-demand service, while the customer deploys operating systems and applications on top of that infrastructure. Cisco cloud material describes this model as providing scalable IT capacity without requiring the organization to own all physical assets. Option C is the best answer because dynamic capacity adjustment is a fundamental cloud capability and a major reason enterprises choose IaaS for variable workloads. Option B is a valid business benefit because consumption-based billing can reduce cost, but the question asks for a primary capability, not the pricing model. Option D describes automation and orchestration, which support cloud operations but are not the specific capability being tested. Option A is closer to hybrid-cloud workload mobility and is not guaranteed by IaaS alone. Reference topics: cloud service models, IaaS, elasticity, scalable compute, on-demand resource provisioning.

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.

Advertising more-specific prefixes toward the preferred service provider is the correct way to influence inbound traffic to enter through a chosen CE interface. BGP inbound path control is indirect: the enterprise cannot set local preference inside remote autonomous systems, and MED is honored only under specific provider policies. The most deterministic option available to the customer is to advertise a longer-prefix route to the preferred provider because Internet and BGP route selection generally prefer the longest matching prefix before BGP path attributes are considered. If the aggregate is advertised to both providers but a more-specific route is advertised to the provider connected to gig0/0, return traffic for that more- specific destination is attracted through that interface. Lowering MED toward the less preferred provider is the opposite of the desired effect. AS-path prepending toward the preferred provider would make that path less attractive. Local preference affects outbound path selection inside the local AS, not inbound traffic from external networks. Reference topics: BGP inbound traffic engineering, longest-prefix match, route aggregation, AS-path prepending, MED, local preference.