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100+ Free JNCIE-Cloud Practice Questions

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Key Facts: JNCIE-Cloud Exam

8 hours

Exam Duration

Juniper Networks

$1,400

Exam Fee

Juniper Networks

3 years

Certification Validity

Juniper Networks

JNCIP-Cloud

Prerequisite

Juniper Networks

Lab-based

Exam Format

Hands-on practical

Multi-vendor

Scope

Juniper + OpenStack/K8s/VMware

The JNCIE-Cloud is an 8-hour hands-on lab exam costing $1,400. Requires JNCIP-Cloud certification. Key areas: Juniper Apstra (~30%), Contrail Networking (~30%), cloud platform integration — OpenStack/Kubernetes/VMware (~20%), cloud-native platforms (~10%), automation/troubleshooting (~10%). Multi-vendor scope includes OpenStack, Kubernetes, VMware NSX-T. Certification valid 3 years.

Sample JNCIE-Cloud Practice Questions

Try these sample questions to test your JNCIE-Cloud exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a Juniper Apstra-managed cloud fabric, a candidate is asked to configure a new routing zone (tenant VRF) and associate it with specific VNIs. Which sequence of steps correctly creates a new routing zone in Apstra?
A.Create the routing zone in the Blueprint's Virtual Networks section, assign a VLAN-to-VNI mapping, configure route import/export policies, and then commit the Blueprint to deploy changes to devices
B.SSH to each leaf switch and manually configure the VRF with `set routing-instances <name> instance-type vrf`
C.Create a new OSPF area in the Blueprint and map tenant subnets to it
D.Define the routing zone in the Paragon Pathfinder portal and push it to the fabric
Explanation: In Juniper Apstra, all fabric configuration is driven through the Blueprint. A routing zone (equivalent to a VRF) is created within the Blueprint, linked to specific virtual networks (VNI/VLAN mappings), and route policies are defined. Committing the Blueprint causes Apstra to render and push device-specific configurations to all affected devices. Direct CLI modifications bypass Apstra's intent validation.
2During a JNCIE-Cloud lab scenario, a candidate must connect an OpenStack cloud environment to a physical Juniper fabric. Which Juniper platform provides the SDN controller functionality to interconnect OpenStack Neutron with the physical network?
A.Juniper Contrail Networking (Tungsten Fabric) as the SDN controller, providing a virtual network overlay that integrates with OpenStack Neutron API
B.Juniper Apstra, which directly manages OpenStack VM networking through its Blueprint API
C.Juniper Mist AI, which extends wireless policy management to OpenStack networks
D.Juniper Security Director, which applies firewall policies to OpenStack tenant networks
Explanation: Juniper Contrail Networking (now known as Tungsten Fabric) is an open-source SDN platform that integrates with OpenStack as a Neutron plugin. It manages virtual network creation, routing, and policy enforcement for VMs in OpenStack clouds and connects them to physical network resources through gateway routers and the physical underlay.
3A JNCIE-Cloud candidate must configure a Contrail virtual network with a specific VNI and enable connectivity between VMs in that network and a physical server in the underlay. Which component provides the Layer 3 gateway function between the Contrail overlay and the physical underlay?
A.A gateway router (MX Series or QFX) configured as a Contrail DC Gateway using BGP EVPN to exchange routes between the virtual network overlay and the physical underlay
B.The OpenStack Nova compute node, which automatically routes traffic between overlay and underlay
C.The Contrail Analytics node, which redirects traffic based on flow statistics
D.A dedicated OSPF router between the Contrail controller and the physical switches
Explanation: Contrail DC Gateways (typically Juniper MX or QFX routers) provide the Layer 3 interconnect between Contrail virtual networks and physical/underlay networks. They run BGP EVPN to exchange virtual network routes with the Contrail control nodes and advertise them into the physical routing domain. This enables VMs in Contrail networks to communicate with physical servers and external networks.
4In a Juniper Apstra fabric, what does "anomaly" detection provide to the operations team?
A.Apstra continuously checks telemetry data from all devices against the intended state defined in the Blueprint; any deviation (a dropped BGP session, a physical link down, or a configuration drift) is flagged as an anomaly with contextual details
B.Anomaly detection scans for known CVE vulnerabilities in Junos OS versions running on fabric devices
C.Anomaly detection monitors server CPU and memory utilization to predict VM migration needs
D.Anomaly detection blocks unauthorized API calls to the Apstra server from external systems
Explanation: Juniper Apstra's closed-loop assurance uses streaming telemetry from devices to continuously validate that the network's actual state matches the Blueprint's intended state. Any deviation — a BGP session failure, a physical port going down, a configuration change made directly on a device (drift) — is detected and surfaced as an anomaly with context about what changed, why it matters, and what the expected state is.
5A JNCIE-Cloud lab requires deploying a Kubernetes cluster with CNI (Container Network Interface) networking provided by Contrail/Tungsten Fabric. What role does Contrail play as a Kubernetes CNI?
A.Contrail serves as the CNI plugin, providing pod networking with virtual networks, network policy enforcement, and connectivity between pods across nodes using MPLS or VXLAN overlays
B.Contrail replaces the Kubernetes API server to manage pod scheduling and lifecycle
C.Contrail provides DNS resolution for Kubernetes services using CoreDNS integration
D.Contrail manages Kubernetes persistent volume storage using iSCSI over the fabric
Explanation: When deployed as a Kubernetes CNI, Contrail (Tungsten Fabric) creates virtual networks for pod-to-pod communication, enforces Kubernetes NetworkPolicy (and extended Contrail security policies), and manages overlay connectivity across compute nodes using MPLS or VXLAN. Each pod's virtual NIC is connected to a Contrail virtual network, and Contrail handles routing between pods, services, and external networks.
6In Juniper Apstra's multi-vendor data center design, which component translates the vendor-agnostic Blueprint intent into device-specific Junos or EOS configurations?
A.The Apstra Device Agent (on-box or off-box) which understands the target device's configuration language and renders the appropriate CLI or NETCONF configuration from the Blueprint intent
B.The Apstra Reference Design templates that directly push Junos configuration snippets
C.OpenConfig YANG models that Apstra uses to configure all devices identically
D.The Apstra Analytics cluster that processes telemetry and generates configuration diffs
Explanation: Juniper Apstra uses vendor-specific Device Agents to bridge between the abstract Blueprint intent and device-specific configuration syntax. Each agent understands its target device's configuration model (Junos CLI for QFX, EOS CLI for Arista, NX-OS for Cisco) and renders the appropriate configuration. Agents communicate via NETCONF, REST, or vendor-specific APIs.
7During a JNCIE-Cloud practical exam, a candidate must troubleshoot a Contrail virtual network where VMs cannot reach each other. Which Contrail component should the candidate inspect first to verify that virtual network routes are being distributed?
A.Contrail Control Node, which runs the BGP control plane and distributes virtual network routes to all vRouter agents on compute nodes
B.Contrail Analytics Node, which collects flow statistics from vRouters
C.OpenStack Keystone, which manages user authentication for Contrail API calls
D.Contrail Web UI, which provides a read-only dashboard of network topology
Explanation: The Contrail Control Node implements the BGP control plane for Contrail virtual networks. It distributes routing information (EVPN/L3VPN routes) to the vRouter agents on each compute node. If VMs cannot communicate, the first step is to verify that the Control Node has correct routes and that vRouter agents have received them. This is the control-plane component for virtual network reachability.
8In a Juniper cloud network design using vSRX as a virtual firewall, what is the key consideration for deploying vSRX in a VMware NSX-T environment?
A.vSRX must be deployed as a service in the NSX-T service chain, where it is inserted inline into the traffic path for specific micro-segments using NSX-T service profiles and partner service integration
B.vSRX can only be deployed as a standalone VM without integration with NSX-T controls
C.vSRX must replace the NSX-T distributed firewall entirely to provide security
D.vSRX in VMware environments requires a physical SRX as the gateway for all VM traffic
Explanation: In VMware NSX-T environments, vSRX integrates as a partner security service through NSX-T's service insertion framework. Traffic flows are redirected to the vSRX through NSX-T service profiles, allowing stateful inspection, IPS, and AppSecure for specific workloads or micro-segments. This provides north-south and selective east-west security without replacing the NSX-T distributed firewall.
9What is the function of the Contrail vRouter in a cloud compute node?
A.Act as the data-plane forwarding engine in each compute node's kernel (or DPDK user space), encapsulating/decapsulating overlay traffic (MPLS/GRE or VXLAN) for VM packets
B.Run the BGP control plane for all virtual networks in the cloud
C.Manage the physical server's CPU and memory allocation for VMs
D.Provide the REST API interface for Contrail configuration operations
Explanation: The Contrail vRouter is the data-plane component installed on each compute node (as a kernel module or DPDK userspace application). It intercepts all VM network packets, applies forwarding decisions from routes distributed by the Control Node, and encapsulates/decapsulates overlay traffic using MPLS over GRE, MPLS over UDP, or VXLAN. The vRouter implements the actual packet forwarding for virtual networks.
10In a Juniper Apstra data center lab scenario, a candidate must verify that a physical device's running configuration matches the Blueprint intent. Which Apstra feature provides this validation?
A.Apstra's config rendering comparison, which diffs the rendered intended configuration against what is currently running on the device and flags any deviations as anomalies
B.Running `show configuration | compare` on the device's Junos CLI
C.Using Security Director to audit the device's running configuration against a policy baseline
D.Manually exporting the device configuration and comparing it to a reference spreadsheet
Explanation: Juniper Apstra continuously renders what the device configuration should be (based on the Blueprint) and compares it against the device's actual running configuration. Any discrepancies — whether from direct CLI changes, failed pushes, or hardware differences — are surfaced as anomalies in the Apstra GUI, providing automated drift detection without any manual comparison.

About the JNCIE-Cloud Exam

The JNCIE-Cloud is Juniper's expert-level cloud networking certification. It is an 8-hour hands-on practical lab exam that tests candidates' ability to deploy, configure, integrate, and troubleshoot a complex multi-technology cloud network. The exam covers Juniper Apstra Intent-Based Networking for fabric management, Contrail Networking (Tungsten Fabric) for SDN with OpenStack and Kubernetes, vSRX virtual firewall cloud deployment, multi-cloud connectivity, and cloud-native Juniper platforms including vMX and Cloud Native Router.

Assessment

Performance-based assessment

Time Limit

8 hours

Passing Score

Not publicly disclosed

Exam Fee

$1,400 (Juniper Networks (proctored lab))

JNCIE-Cloud Exam Content Outline

~30%

Juniper Apstra Intent-Based Networking

Blueprint design lifecycle, logical devices and rack topology, routing zones (VRFs), virtual networks (VNI mappings), multi-vendor device agents, Intent-Based Analytics (IBA) custom probes, anomaly detection and drift, flow validation, RBAC user management, brownfield fabric import

~30%

Contrail Networking (Tungsten Fabric)

Control Node (BGP/XMPP), Config Node (REST API/Cassandra), Analytics Node, vRouter data plane (kernel/DPDK), virtual network design, service chaining (Service Templates and Instances), security groups vs. network policies, tag-based Application Policy Sets, OpenStack Neutron integration, Kubernetes CNI, ZooKeeper distributed coordination

~20%

Cloud Platform Integration

vSRX service insertion in VMware NSX-T, Contrail DC Gateway BGP EVPN/L3VPN peering with MX, vCenter plugin for ESXi VM networking, multi-cloud extension with IPsec tunnels to AWS/Azure VGW, Contrail and OpenStack Nova/Keystone integration

~10%

Cloud Native Juniper Platforms

vMX (DPDK-based virtual router) deployment and sizing, vQFX (two-VM RE+PFE model) for lab/CI-CD, Juniper Cloud Native Router (CNR) containerized Junos in Kubernetes, vSRX NSX-T service profile integration

~10%

Automation and Troubleshooting

Apstra REST API, Apstra IBA probe development, Contrail vRouter CLI (`vif --list`, `flow --list`, `rt --get`), BGP session verification, Apstra anomaly-driven troubleshooting workflow

How to Pass the JNCIE-Cloud Exam

What You Need to Know

  • Passing score: Not publicly disclosed
  • Assessment: Performance-based assessment
  • Time limit: 8 hours
  • Exam fee: $1,400

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

JNCIE-Cloud Study Tips from Top Performers

1Build a lab environment with Apstra, Contrail, OpenStack, and Kubernetes — the JNCIE-Cloud is purely hands-on
2Know all four Contrail node types: Config (API + Cassandra), Control (BGP/XMPP), Analytics (flow data + UVE), vRouter (data-plane on compute nodes)
3Understand Apstra Blueprint commit workflow: every change goes through the Blueprint; direct CLI on devices causes drift anomalies
4Study Contrail service chaining: Service Templates (define service type) → Service Instances (instantiate the VNF) → network policy (steer traffic through the chain)
5Know ZooKeeper's role: distributed coordination and leader election for Config Node cluster — prevents split-brain
6Practice vRouter CLI: `vif --list` for interfaces, `flow --list` for sessions, `rt --get` for per-VRF routing — these are lab troubleshooting tools
7Understand Apstra IBA (Intent-Based Analytics): custom telemetry probes with graph queries — lab may ask you to create or interpret IBA probes

Frequently Asked Questions

What is the JNCIE-Cloud exam format?

JNCIE-Cloud is an 8-hour proctored hands-on lab exam administered at Juniper Education Centers. Candidates must configure, integrate, and troubleshoot a live multi-technology cloud network. There are no multiple-choice questions — all tasks require actual configuration on real or virtual Juniper platforms (Apstra, Contrail, vSRX, vMX) and integration with OpenStack, Kubernetes, and VMware.

What are the prerequisites for JNCIE-Cloud?

JNCIP-Cloud certification is required before scheduling the JNCIE-Cloud lab exam. Candidates should also have extensive hands-on experience with Juniper Apstra, Contrail Networking, OpenStack, Kubernetes, and VMware NSX-T. Most candidates prepare for 6-12 months with dedicated lab environments after achieving JNCIP-Cloud.

How much does JNCIE-Cloud cost?

The JNCIE-Cloud lab exam costs $1,400 USD per attempt. Because lab seats are limited and the exam fee is substantial, thorough preparation before attempting is critical. Most candidates invest in Juniper's self-study bundle and build comprehensive lab environments before sitting the exam.

What is the difference between Contrail Control Node and Config Node?

The Contrail Control Node runs the BGP/XMPP control plane: it distributes virtual network routes to vRouter agents using XMPP and peers with physical gateway routers using MP-BGP EVPN/L3VPN. The Config Node is the configuration API server: it exposes the northbound REST API consumed by OpenStack Neutron and Kubernetes, and stores intent configuration in Cassandra with ZooKeeper for distributed locking.

What Contrail vRouter CLI commands are essential for troubleshooting?

The three essential Contrail vRouter CLI commands are: `vif --list` (shows all virtual interfaces including VMI, fabric, and tunnel interfaces), `flow --list` (displays the active flow/session table in the vRouter), and `rt --get <vrf-id>` (shows the routing/forwarding table for a specific VRF). These are data-plane inspection tools essential for diagnosing vRouter connectivity failures in the JNCIE-Cloud lab.