Juniper JN0-683 Online Practice Questions and Exam Preparation

Juniper JN0-683 Online Questions & Answers

• Question 41:

  You are using a single tenant data center with a bridged overlay architecture. In this scenario, how do hosts of the different virtual networks communicate with each other?

  A. off-fabric using an external device
  B. using anycast gateway addresses configured on the leaf devices
  C. using EVPN Type 5 routes
  D. using virtual gateway addresses configured on the spine
  A. off-fabric using an external device

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  Explanation

  Understanding Bridged Overlay Architecture:

  In a single-tenant data center using a bridged overlay architecture, virtual networks (VLANs) are typically isolated within the fabric, with traffic between these VLANs handled outside the fabric.

  Communication Between Different Virtual Networks:

  A. off-fabric using an external device:This is correct. In many bridged overlay architectures, communication between different virtual networks is handled off-fabric, often using an external router or firewall that connects the different VLANs.

  The fabric itself primarily provides Layer 2 connectivity within each VLAN, leaving inter-VLAN routing to be handled externally.

  Data Center

  References:

  This design is common in smaller or simpler data center environments where a single tenant does not require complex on-fabric routing and prefers to handle inter-VLAN routing through dedicated devices.

• Question 42:

  Exhibit.

  

  Connections between hosts connected to Leaf-1 and Leaf-2 are not working correctly.

  Referring to the exhibit, which two configuration changes are required to solve the problem? (Choose two.)

  A. Configure the setswitch-options vtep-source-interface irb.0parameter on Leaf-1.
  B. Configure the set switch-options vrf-target target:65000:l parameteron Leaf-2.
  C. Configure the setswitch-options route-distinguisher i92.168.100.50:i parameter on Leaf-1.
  D. Configure the setswitch-options service-id 1 parameter on Leaf-2.
  C. Configure the setswitch-options route-distinguisher i92.168.100.50:i parameter on Leaf-1.

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  Explanation

  Issue Analysis:

  The problem in the exhibit suggests a mismatch in configuration parameters between Leaf-1 and Leaf-2, leading to communication issues between hosts connected to these leaf devices.

  Configuration Mismatches:

  Service-ID:Leaf-1 has service-id 1 configured, while Leaf-2 does not have this parameter. For consistency and proper operation, the service-id should be the same across both leaf devices.

  VRF Target:Leaf-1 is configured with vrf-target target:65000:1, while Leaf-2 is configured with vrf-target target:65000:2. To allow proper VRF import/export between the two leafs, these should match.

  Corrective Actions:

  C. Configure the set switch-options vrf-target target:65000:1 parameter on Leaf-2:This aligns the VRF targets between the two leaf devices, ensuring they can correctly import and export routes.

  E. Configure the set switch-options service-id 1 parameter on Leaf-2:This ensures that both Leaf-1 and Leaf-2 use the same service ID, which is necessary for consistency in the EVPN- VXLAN setup.

  Data Center

  References:

  Correct configuration of VRF targets and service IDs is critical in EVPN-VXLAN setups to ensure that routes and services are correctly shared and recognized between different devices in the network fabric.

• Question 43:

  You want to provide a OCI that keeps each data center routing domain isolated, while also supporting translation of VNIs. Which DCI scheme allows these features?

  A. MPLS DCI label exchange
  B. over the top (OTT) with VNI translation enabled
  C. VXLAN stitching
  D. over the top (OTT) with proxy gateways
  C. VXLAN stitching

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  Explanation

  Understanding DCI (Data Center Interconnect) Schemes:

  DCI schemes are used to connect multiple data centers, enabling seamless communication and resource sharing between them. The choice of DCI depends on the specific requirements, such as isolation, VNI translation, or routing domain

  separation.

  VXLAN Stitching:

  VXLAN stitching involves connecting multiple VXLAN segments, allowing VNIs (VXLAN Network Identifiers) from different segments to communicate with each other while maintaining separate routing domains.

  This approach is particularly effective for keeping routing domains isolated while supporting VNI translation, making it ideal for scenarios where you need to connect different data centers or networks without merging their control planes.

  Other Options:

  A. MPLS DCI label exchange:This option typically focuses on MPLS-based interconnections and does not inherently support VNI translation or isolation in the context of VXLAN.

  B. Over the top (OTT) with VNI translation enabled:This could support VNI translation but does not inherently ensure routing domain isolation.

  D. Over the top (OTT) with proxy gateways:This typically involves using external gateways for traffic routing and may not directly support VNI translation or isolation in the same way as VXLAN stitching.

  Data Center

  References:

  VXLAN stitching is a powerful method in multi-data center environments, allowing for flexibility in connecting various VXLAN segments while preserving network isolation and supporting complex interconnect requirements.

• Question 44:

  You are adding a server lo a tenant's network within your data center and must limit access to a specific traffic type within the tenant network without pushing all tenant traffic through a firewall.

  What will satisfy this requirement?

  A. Use route leaking with EVPN and a routing policy.
  B. Use filter-based forwarding.
  C. Put the new server on a unique subnet within the tenant's network.
  D. Use a static route in the tenant VRF with a firewall as the next hop for traffic to the new server.
  B. Use filter-based forwarding.

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  Explanation

  Controlling Traffic Within a Tenant's Network:

  The requirement is to limit access to specific traffic types within a tenant's network without routing all tenant traffic through a firewall. This requires a selective method that can direct specific types of traffic to different paths based on the nature

  of the traffic.

  Filter-Based Forwarding (FBF):

  FBF is a technique that allows for routing decisions based on filters applied to the traffic, such as matching on source IP addresses, destination IP addresses, or even specific application types (like HTTP or FTP). This allows specific types of

  traffic to be forwardedto a specific next hop (e.g., a firewall) without affecting the entire traffic flow within the tenant's network.

  Conclusion:

  Option B:Correct--Filter-based forwarding allows for granular control of traffic, ensuring that only specific types of traffic within the tenant's network are redirected through a firewall, satisfying the requirement.

• Question 45:

  You are designing an IP fabric tor a large data center, and you are concerned about growth and scalability. Which two actions would you take to address these concerns? (Choose two.)

  A. Design a five-stage Clos IP fabric.
  B. Design a three-stage Clos IP fabric.
  C. Use EX4300 Series devices as the spine devices.
  D. Use OFX5700 Series devices as the super spines.
  B. Design a three-stage Clos IP fabric.
  D. Use OFX5700 Series devices as the super spines.

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  Explanation

  Clos IP Fabric Design:

  A Clos fabric is a network topology designed for scalable, high-performance data centers. It is typically arranged in multiple stages, providing redundancy, high bandwidth, and low latency.

  Three-Stage Clos Fabric:

  Option B:A three-stage Clos fabric, consisting of leaf, spine, and super spine layers, is widely used in data centers. This design scales well and allows for easy expansion by adding more leaf and spine devices as needed.

  Super Spines for Scalability:

  Option D:Using high-capacity devices like the QFX5700 Series as super spines can handle the increased traffic demands in large data centers and support future growth. These devices provide the necessary bandwidth and scalability for

  large-scale deployments.

  Conclusion:

  Option B:Correct--A three-stage Clos fabric is a proven design that addresses growth and scalability concerns in large data centers.

  Option D:Correct--QFX5700 Series devices are suitable for use as super spines in large-scale environments due to their high performance.

• Question 46:

  Which two statements are true about EVPN routes for Data Center Interconnect? (Choose two.)

  A. Type 5 EVPN routes require a VXLAN tunnel to the protocol next hop.
  B. Type 2 EVPN routes do not require a VXLAN tunnel to the protocol next hop.
  C. Type 2 EVPN routes require a VXLAN tunnel to the protocol next hop.
  D. Type 5 EVPN routes do not require a VXLAN tunnel to the protocol next hop.
  B. Type 2 EVPN routes do not require a VXLAN tunnel to the protocol next hop.
  D. Type 5 EVPN routes do not require a VXLAN tunnel to the protocol next hop.

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  Explanation

  Type 2 EVPN Routes:

  Type 2 routesadvertise MAC addresses within an EVPN instance and are used primarily for Layer 2 bridging. These routes do not require a VXLAN tunnel to the protocol next hop because they operate within the same Layer 2 domain.

  Type 5 EVPN Routes:

  Type 5 routesare used to advertise IP prefixes (Layer 3 routes) within EVPN. Similar to Type 2 routes, they do not require a VXLAN tunnel to the protocol next hop because they represent L3 routes, which are managed at the routing layer

  without the need for VXLAN encapsulation.

  Conclusion:

  Option B:Correct--Type 2 routes do not need a VXLAN tunnel to the next hop, as they are used for Layer 2. Option D:Correct--Type 5 routes also do not need a VXLAN tunnel because they operate at Layer 3, handling IP prefixes.

• Question 47:

  You are deploying multiple Juniper switches al the same location. Your switches are currently using the factory-default configuration.

  In this scenario, which two statements are correct? (Choose two.)

  A. The DHCP server configuration cannot provide Junos version requirements to DHCP clients.
  B. The switch will try to request an IP address from a DHCP server using all interfaces that are connected and are operational.
  C. The switch will try to request an IP address from a DHCP server using only the management interface.
  D. The DHCP server configuration can provide Junos version requirements to DHCP clients.
  B. The switch will try to request an IP address from a DHCP server using all interfaces that are connected and are operational.
  D. The DHCP server configuration can provide Junos version requirements to DHCP clients.

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  Explanation

  DHCP Behavior in Factory-Default Configuration:

  Option B:In the factory-default configuration, Juniper switches are designed to send DHCP requests on all operational interfaces. This behavior ensures that the switch can obtain an IP address for management and further configuration from

  any available DHCP server.

  Option D:The DHCP server can provide additional configuration parameters, including the required Junos version. This allows for automated provisioning and ensures that the switch is running the correct software version.

  Conclusion:

  Option B:Correct--The switch will use any operational interface to request an IP address via DHCP.

  Option D:Correct--The DHCP server can specify Junos version requirements, enabling automated software management.

• Question 48:

  You want to ensure thatVXLAN traffic from the xe-0/0/12 interlace is being encapsulatedby logical vlep. 32770 and sent to a remote leaf device in this scenario, which command would you use to verify that traffic is flowing?

  A. monitor traffic interface xe-0/0/12
  B. show interface terse vtep.32770
  C. show interfaces terse vtep.32770 statistics
  D. show interfaces vtep.32770 detail
  C. show interfaces terse vtep.32770 statistics

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  Explanation

  VXLAN Traffic Verification:

  To ensure VXLAN traffic from the xe-0/0/12 interface is correctly encapsulated by the logical vtep.32770 and sent to a remote leaf device, it is essential to monitor the relevant interface statistics.

  The command show interfaces terse vtep.32770 statistics provides a concise overview of the traffic statistics for the specific VTEP interface, which can help verify whether traffic is being correctly encapsulated and transmitted.

  This command is particularly useful for quickly checking the traffic counters and identifying any potential issues with VXLAN encapsulation or transmission.

  It allows you to confirm that traffic is flowing as expected, by checking the transmitted and received packet counters.

  Data Center

  References:

  Monitoring interface statistics is a crucial step in troubleshooting and validating network traffic, particularly in complex overlay environments like EVPN-VXLAN.

• Question 49:

  You are asked for TX and RX traffic statistics for each interface to which an application server is attached. The statistics need to be reported every five seconds. Using the Junos default settings, which telemetry method would accomplish this request?

  A. gNMI
  B. SNMP
  C. Native Sensors
  D. OpenConfig
  C. Native Sensors

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  Explanation

  Telemetry Methods in Junos:

  Telemetry is used to collect and report data from network devices. For high-frequency statistics reporting, such as every five seconds, you need a telemetry method that supports this level of granularity and real-time monitoring.

  Junos Native Sensors:

  Option C:Native Sensors in Junos provide detailed, high-frequency telemetry data, including TX and RX traffic statistics for interfaces. They are designed to offer real-time monitoring with customizable sampling intervals, making them ideal for

  the five-second reporting requirement.

  Conclusion:

  Option C:Correct--Native Sensors in Junos are capable of providing the required high-frequency telemetry data every five seconds.

• Question 50:

  You are deploying an IP fabric using EBGP and notice that your leaf devices areadvertising and receiving all the routes. However, the routes are not installed in the routing table and are marked as hidden.

  Which two statements describe how to solve the issue? (Choose two.)

  A. You need to configure as-override.
  B. You need to configure a next-hop self policy.
  C. You need to configure loops 2.
  D. You need to configure multipath multiple-as.
  B. You need to configure a next-hop self policy.
  D. You need to configure multipath multiple-as.

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  Explanation

  Issue Overview:

  The leaf devices in an IP fabric using eBGP are advertising and receiving all routes, but the routes are not being installed in the routing table and are marked as hidden. Thistypically indicates an issue with the BGP configuration, particularly

  with next-hop handling or AS path concerns.

  Corrective Actions:

  B. You need to configure a next-hop self policy:This action ensures that the leaf devices modify the next-hop attribute to their own IP address before advertising routes to their peers. This is particularly important in eBGP setups where the

  next-hop may not be directly reachable by other peers.

  D. You need to configure multipath multiple-as:This setting allows the router to accept multiple paths from different autonomous systems (ASes) and use them for load balancing. Without this, the BGP process might consider only one path

  and mark others as hidden.

  Incorrect Statements:

  A. You need to configure as-override:AS-override is used to replace the AS number in the AS- path attribute to prevent loop detection issues in MPLS VPNs, not in a typical eBGP IP fabric setup.

  C. You need to configure loops 2:There is no specific BGP command loops 2 relevant to resolving hidden routes in this context. It might be confused with allowas-in, which is used to allow AS path loops under certain conditions.

  Data Center

  References:

  Proper BGP configuration is crucial in IP fabrics to ensure route propagation and to prevent routes from being marked as hidden. Configuration parameters like next-hop self and multipath multiple-as are common solutions to ensure optimal

  route installation and load balancing in a multi-vendor environment.