400-007 Exam Dumps - Cisco Certified Design Expert (CCDE v3.1)

Encrypting data at rest and in transit is a fundamental best practice to ensure end-to-end data security.

It protects sensitive data both while stored (disk, database) and while moving across networks.

Why other options are incorrect:

A: IPsec secures specific tunnels, but isn’t a complete private cloud solution.

C: Vendor consistency doesn’t guarantee best practice.

D: Anonymization supports privacy but is not a core security best practice for data security.

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B (OpenFlow):OpenFlow is a widely used SDN southbound protocol that enables controllers to directly manage forwarding tables of switches.

D (Open vSwitch Database - OVSDB):OVSDB is used by SDN controllers (especially in virtualized environments) to manage configuration state and flow entries on Open vSwitch instances.

Other options explained:

A/C: Non-existent protocols.

E: NetFlow is a traffic monitoring protocol, not a control interface for SDN controllers.

PortFast is a feature that allows access ports to enter the STP forwarding state immediately, without waiting for the usual listening and learning states. This accelerates the connection of end devices like PCs or servers.

A key design benefit is that PortFastdoes not trigger topology changeswhen devices are plugged in or disconnected. This prevents unnecessary STP recalculations and protects core stability.

Correct Statement (A):STP does not consider link transitions on PortFast-enabled ports as topology changes, reducing control-plane overhead.

Other options misrepresent the function of PortFast:

B:PortFast does not disable STP; it bypasses specific STP states.

C/D/E/F:These describe other features like Loop Guard or UDLD, not PortFast.

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B (Support availability):Defines hours of service and whether support is available 24/7 or during business hours.

E (Resolution time):Specifies the timeframe within which the service provider commits to resolve incidents.

Other options explained:

A: Cost and size are contractual, not SLA performance metrics.

C: Sustainability is long-term environmental or operational, not SLA-specific.

D: Reliability is often captured as uptime or availability but not as a discrete SLA support term.