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JNCIE-ENT Free Sample Questions

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JPR-944 Sample Questions

  1. Question 1

    Intermediate

    Automation · PyEZ scripts

    You are designing an automation strategy for a Juniper-based data center using PyEZ. Your script needs to connect to a device, retrieve the full configuration in JSON format, and handle any connection errors gracefully. Which Python code snippet correctly implements the connection and retrieval using the Device class?

    Answer and explanation

    Correct answer: B

    The Device class is the primary entry point in PyEZ. After instantiating and opening the connection with dev.open(), the rpc.get_config() method is used to retrieve configuration. Passing options={'format':'json'} (or specific arguments depending on the PyEZ version wrapper) instructs the device to return JSON output. The other options either use incorrect method names like pull_config or incorrect format arguments.

  2. Question 2

    Advanced

    Class of Service · CoS configuration and troubleshoot

    A network architect is deploying Class of Service (CoS) on an EX Series switch. The requirement is to ensure that Voice over IP (VoIP) traffic is strictly prioritized over all other traffic types during congestion, but must not starve the control plane traffic. Which scheduler configuration accomplishes this?

    Answer and explanation

    Correct answer: A

    On Juniper platforms, 'strict-high' priority is designed exactly for this use case. It ensures the queue is serviced before any other queue, including 'strict-high' queues if they exist (though typically only one is recommended per port to avoid conflict), but importantly, Juniper architecture implicitly protects network control traffic in specific reserved queues or allows you to map control traffic to high priority queues. 'strict-high' is the correct setting for delay-sensitive VoIP.

  3. Question 3

    AdvancedMultiple answers

    IGP · IPv4 routes using OSPFv3

    You are troubleshooting an OSPFv3 adjacency issue between two routers over an IPv4 infrastructure. The routers are configured to support IPv4 unicast address families within OSPFv3. The adjacency stays in the INIT state. Which two configuration checks are most relevant to resolving this specific OSPFv3 AF-mode issue? (Select TWO)

    Answer and explanation

    Correct answers: C, D

    OSPFv3 uses IPv6 link-local addresses for neighbor discovery and hello packet exchange, even when transporting IPv4 routes (in a dual-stack or AF-aware configuration). If the IPv6 link-local communication is broken, the adjacency cannot form.

    In OSPFv3, the Router ID is a 32-bit number. If no IPv4 address is configured on an interface (which might be the case in a pure IPv6 environment, though here we are doing IPv4 over OSPFv3), or if the system cannot automatically select one, the process fails. Manually setting the router-id is critical.

  4. Question 4

    Intermediate

    EVPN · EVPN configuration and troubleshoot

    In an EVPN-VXLAN environment, you observe that traffic for a specific host is being flooded unnecessarily. You suspect an issue with the MAC-IP advertisement routes. Which EVPN Route Type is responsible for advertising MAC addresses and optional IP addresses to remote VTEPs to suppress flooding?

    Answer and explanation

    Correct answer: B

    EVPN Type 2 routes are 'MAC/IP Advertisement' routes. They carry the MAC address and optionally the IP address of hosts. This allows VTEPs to learn reachable hosts via BGP rather than data plane flooding, enabling ARP suppression and efficient forwarding.

  5. Question 5

    Intermediate

    BGP · IBGP route-reflector

    You are configuring a BGP route reflector (RR) in a service provider network. To prevent routing loops within the cluster, the RR adds a specific attribute to the BGP update before reflecting it to a client. Which attribute is used for this specific loop prevention mechanism within the cluster?

    Answer and explanation

    Correct answer: D

    The Originator ID is a BGP attribute (non-transitive) created by a Route Reflector. It carries the Router ID of the originator of the route in the local AS. If a router receives an update with its own Router ID in the Originator ID field, it discards the update to prevent a loop.

  6. Question 6

    Intermediate

    Layer 2 Switching and Security · Virtual Chassis

    True or False: In a Juniper Virtual Chassis configuration utilizing a pre-provisioned file, the member ID of a switch is automatically determined by the order in which the switches boot up.

    Answer and explanation

    Correct answer: B

    This is False. In a 'pre-provisioned' configuration, you explicitly map the chassis serial number to a Member ID in the configuration file. Boot order does not dictate the ID; the configuration does. The automatic election based on boot order applies to a non-provisioned (default) setup.

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