Cisco Updated 400-007 Exam Questions and Answers by louise

A (Risk-based and adaptive access policies): After verifying user identity within a Zero Trust architecture, the next logical step is to apply continuous, adaptive risk-based policies that evaluate contextual factors (device posture, behavior, location, etc.) before granting access. This approach dynamically responds to threats such as phishing attacks by adjusting access permissions based on real-time risk.

Other options explained:

B/C/D: These are supporting mechanisms, but risk-based policies directly address dynamic attack mitigation.

iBGP’s full mesh requirement refers to logical BGP session establishment, not physical network design. As long as reachability exists between iBGP peers (through an IGP like OSPF or IS-IS), iBGP sessions can be established regardless of physical topology (ring, star, partial mesh, etc.).

Key CCDE v3.1 design principles:

Logical iBGP mesh ≠ physical mesh requirement.

Physical topologies can be optimized independently of iBGP peering structure.

Control plane designs like route reflectors or confederations further optimize scalability without changing physical topology.

Why other options are incorrect:

B: iBGP works on any topology where IP reachability exists.

C: Physical full mesh is unnecessary for iBGP.

D: iBGP functions over any IGP-provided reachability domain, including rings.

Both FabricPath and TRILL are Layer 2 multipath technologies designed to eliminate spanning tree and allow for efficient forwarding across Layer 2 fabrics using routing techniques:

B (FabricPath permits active-active FHRP and TRILL supports anycast gateway):FabricPath (Cisco proprietary) integrates with vPC+ to allow active-active First Hop Redundancy Protocol (FHRP) operation at the access layer. This enables multiple default gateways to operate simultaneously, improving resiliency and utilization.TRILL (IEEE standard) uses anycast gateway functionality natively, where multiple switches share the same IP and MAC address for default gateway, allowing hosts to forward to any available gateway, providing active-active behavior at Layer 3.

Other options explained:

A: Incorrect — both FabricPath and TRILL are based on IS-IS for control plane operations; VXLAN is not part of TRILL.

C: Incorrect — both FabricPath and TRILL support ECMP (Equal Cost Multi-Path) to utilize multiple paths efficiently.

D: Incorrect — both technologies allow active-active forwarding at Layer 2.

This comparison highlights CCDE v3.1 design expertise in data center fabric architectures and control plane technologies.