Cisco Updated 400-007 Exam Questions and Answers by aydan

The scenario prioritizes:

In-house management (not managed services)

Scalability (exponential branch growth)

OPEX reduction (low operational cost)

SD-WAN over L3VPN offers a balance of:

Mid-level ISP cost (leveraging L3VPN as transport)

Centralized management and automation (ZTP, templates)

Support for segmentation, application-aware routing, and path control

Lower OPEX due to simplified configuration and monitoring

Managed SD-WAN has higher ISP and OPEX cost, and DMVPN is more manual and complex to scale. SD-WAN over L2VPN might reduce ISP cost but is less common and not optimal for rapid scalability.

Comprehensive and Detailed Explanation:

C: Before migrating to the cloud, organizations must conduct a thorough assessment of their current infrastructure. This includes evaluating applications, workloads, network topology, security posture, compliance requirements, and interdependencies. This step is essential for planning migration phases, identifying risks, and aligning architecture to business needs.

Other options:

A: SASE (Secure Access Service Edge) may be a future consideration but is not foundational to cloud readiness.

B: WAN optimization is important but comes after understanding infrastructure needs.

D: RPO/RTO calculations are part of disaster recovery, not initial cloud migration planning.

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B (EAP - Extensible Authentication Protocol):EAP is commonly used for 802.1X port-based authentication, allowing identity-based control for users on the network. This enables policy enforcement, identity-based segmentation (micro/macro segmentation), and leverages existing domain credentials via backend integration.

Other options explained:

A: LDAP is backend directory, not an authentication protocol for access ports.

C: TACACS+ is used primarily for administrative access.

D: RADIUS transports the EAP exchange but is not the authentication protocol itself.

C: MPLS TE (Traffic Engineering) is designed to optimize IP traffic flow by considering bandwidth constraints, delay sensitivity, and administrative policy. It enables operators to steer traffic based on defined metrics rather than pure shortest-path IGP routes.

Other options:

A: MPLS TE can coexist with LDP and still rely on IGP for link-state info; it does not replace LDP.

B: MPLS TE by itself doesn’t provide protection; it requires Fast Reroute (FRR) mechanisms like link/node protection extensions.

D: MPLS TE is independent of VPN topology; it can operate without requiring a full-mesh of Layer 3 VPNs.

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