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JNCIP-Cloud Free Sample Questions

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JN0-610 Sample Questions

  1. Question 1

    Intermediate

    Contrail Architecture · Control Plane Signaling

    You are designing a Contrail Networking deployment for a large-scale telecommunications provider. The customer requires strict separation of control plane traffic from management traffic. Which specific interface on the Contrail Control Node is utilized to establish XMPP sessions with the vRouter agents running on compute nodes?

    Answer and explanation

    Correct answer: D

    The Contrail Control Node uses its control interface (often an IP on the management or a dedicated control network) to establish XMPP sessions with vRouters. While it can physically share a NIC with management, logically the XMPP connection targets the Control Node's IP defined in the configuration, distinct from the forwarding plane which handles encapsulated traffic.

  2. Question 2

    Intermediate

    Kubernetes Integration · Namespace Isolation

    A cloud architect is troubleshooting a Kubernetes cluster integrated with Contrail CNI. Pods in the 'finance' namespace cannot communicate with Pods in the 'hr' namespace, even though no NetworkPolicies have been applied. What is the default behavior of Contrail Networking regarding Kubernetes namespace isolation?

    Answer and explanation

    Correct answer: A

    When Contrail is integrated with Kubernetes, the default isolation mode maps every Kubernetes namespace to a distinct Contrail Virtual Network (VN). By default, these VNs are isolated from one another unless explicit policies or floating IPs are configured to allow traffic between them.

  3. Question 3

    Advanced

    Contrail Security · Service Chaining

    You are configuring a service chain in Contrail to route traffic from a Web VN to a Database VN through a virtual firewall. You have created the Service Template and the Service Instance. What is the mandatory next step to actually steer the traffic through this service instance?

    Answer and explanation

    Correct answer: A

    In Contrail, service chaining is policy-based. After defining the template and instance, you must create a Network Policy where the action is 'Apply Service' (pointing to your Service Instance). This policy must then be attached to the relevant Virtual Networks (Web and Database) to effect the routing change.

  4. Question 4

    BeginnerMultiple answers

    Contrail Architecture · Protocols

    Which TWO protocols are primarily used for communication between the Contrail Control Nodes and the vRouters on compute nodes? (Select TWO)

    Answer and explanation

    Correct answers: D, E

    XMPP is used for the control plane exchange of routing information and configuration data between the Control Node and the vRouter Agent. Sandesh is used for sending analytics data (logs, stats, flows) from the vRouter to the Analytics Collector.

    Sandesh is the proprietary protocol used for analytics and telemetry streams from vRouter to the Analytics nodes.

  5. Question 5

    Beginner

    Contrail Architecture · vRouter Types

    True or False: In a Contrail environment using DPDK vRouter, the vRouter forwarding plane runs in the Linux kernel space to maximize performance.

    Answer and explanation

    Correct answer: B

    This is False. The DPDK (Data Plane Development Kit) vRouter runs in user space, bypassing the Linux kernel networking stack to achieve higher throughput and lower latency. The Kernel vRouter (default/legacy) runs in kernel space.

  6. Question 6

    Intermediate

    Troubleshooting · Control Plane

    An administrator observes that the 'contrail-status' command on a Control Node shows the 'contrail-control' service as 'Active' but with '0 XMPP peers'. The compute nodes are powered on and reachable via ping. What is the most likely cause of this issue?

    Answer and explanation

    Correct answer: B

    The vRouter agent initiates the XMPP connection to the Control Node. If the Control Node shows 0 peers, it means no agents have successfully connected. This is commonly caused by misconfiguration in the contrail-vrouter-agent.conf file where the Control Node list is incorrect, or a firewall is blocking port 5269 (XMPP).

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