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Network Virtualization Flashcards

6 cards from real Cisco ENCOR practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Network Virtualization flashcards as text

  1. Which header field uniquely identifies a VXLAN segment and is carried in the VXLAN header?

    Answer: VNI (VXLAN Network Identifier)

    The 24-bit VNI in the VXLAN header identifies the individual virtual network segment.

  2. In Cisco SD-WAN, which protocol is used between vSmart controllers and WAN Edge routers to exchange routes and policies?

    Answer: OMP

    OMP (Overlay Management Protocol) is Cisco's proprietary SD-WAN control plane protocol used between vSmart and WAN Edge devices.

  3. What is a key advantage of using VXLAN over traditional VLANs in large data centers?

    Answer: Support for up to 16 million segments vs 4,096 VLANs

    VXLAN's 24-bit VNI supports ~16 million segments compared to the 4,094 usable VLANs in 802.1Q.

  4. Which component in an NFV architecture is responsible for lifecycle management of VNFs?

    Answer: VNFM

    The VNF Manager (VNFM) handles instantiation, scaling, update, and termination of VNF instances.

  5. In LISP, what does the ITR do when it cannot find an EID-to-RLOC mapping in its cache?

    Answer: Sends a Map-Request to the Map Resolver

    When the ITR has a cache miss, it sends a Map-Request to the Map Resolver to obtain the EID-to-RLOC mapping.

  6. Which Cisco SD-WAN feature allows traffic to be steered based on application-aware policies?

    Answer: Application-Aware Routing (AAR)

    Application-Aware Routing (AAR) in Cisco SD-WAN dynamically routes traffic based on application type and real-time link performance metrics.

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  1. cisco.com — Eligibility, renewal, score validity, test delivery, fees, time limit · verified Oct 2026