Juniper JN0-683 Online Practice Questions and Exam Preparation

Juniper JN0-683 Online Questions & Answers

• Question 61:

  Exhibit.

  

  Referring to the configuration shown in the exhibit, assume that there is no external router present, and that the configuration is fabric-only.

  Which two statements are true about the example configuration? (Choose two.)

  A. VNI 10006is assigned to vlan 800 (irb.800).
  B. Devices in irb.400 (vlan 400) are not able to communicate directly with devices in routing instance Customer A.
  C. Devices in routing instance Customer A are able to communicate with devices in routing instance Customer B
  D. Devices in irb.400 (vlan 400) and irb.800 (vlan 800) are able to communicate over the fabric.
  B. Devices in irb.400 (vlan 400) are not able to communicate directly with devices in routing instance Customer A.
  D. Devices in irb.400 (vlan 400) and irb.800 (vlan 800) are able to communicate over the fabric.

  ---

  Explanation

  Understanding the Configuration:

  The exhibit shows configurations for two VRFs (Customer_A and Customer_B) with specific VLANs and VNIs assigned. Each VRF has interfaces (IRBs) associated with particular VLANs.

  Communication Between VLANs and Routing Instances:

  Option B:VLAN 400 (irb.400) is part of Customer_B, and there is no direct connection or routing between Customer_A and Customer_B in the configuration provided. Therefore, devices in irb.400 cannot communicate directly with devices in

  the Customer_A routing instance.

  Option D:Since irb.400 (VLAN 400) and irb.800 (VLAN 800) are part of the same routing instance (Customer_B), they can communicate over the fabric using VXLAN encapsulation.

  Conclusion:

  Option B:Correct--There is no direct communication between devices in irb.400 (Customer_B) and routing instance Customer_A.

  Option D:Correct--Devices in VLAN 400 and VLAN 800 can communicate within the Customer_B routing instance over the fabric.

• Question 62:

  You are deploying a new network lo support your Al workloads on devices that support at least 400 Gbps Ethernet. There is no requirement for any Layer 2 VLANs in this network. Which network architecture would satisfy this requirement?

  A. an IP fabric using PIM-SM to signal VXLAN overlay
  B. an IP fabric using the EVPN-MPLS architecture
  C. an IP fabric with an EVPN-VXLAN architecture
  D. an IP fabric using EBGP
  D. an IP fabric using EBGP

  ---

  Explanation

  Requirements for AI Workloads:

  The scenario requires a network that supports at least 400 Gbps Ethernet and does not require Layer 2 VLANs. This setup is well-suited for a pure Layer 3 network, which can efficiently route traffic between devices without the overhead or

  complexity of maintaining Layer 2 domains.

  Choosing the Right Network Architecture:

  Option D:An IP fabric using EBGP (External BGP) is ideal for this scenario. In a typical IP fabric, EBGP is used to handle routing between spine and leaf switches, creating a scalable and efficient network. Since there is no need for Layer 2

  VLANs, the pure IP fabric design with EBGP provides a straightforward and effective solution.

  Options A, B, and Cinvolve more complex architectures (like VXLAN or EVPN), which are unnecessary when there's no requirement for Layer 2 overlays or VLANs.

  Conclusion:

  Option D:Correct--An IP fabric with EBGP is the most suitable and straightforward architecture for a network that needs to support high-speed AI workloads without Layer 2 VLANs.

• Question 63:

  Whatare two ways in which an EVPN-signaled VXLAN is different from a multicast-signaled VXLAN? (Choose two.)

  A. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using IS-IS.
  B. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using BGP.
  C. An EVPN-signaled VXLAN is less resource intensive.
  D. An EVPN-signaled VXLAN features slower and more complete convergence.
  B. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using BGP.
  C. An EVPN-signaled VXLAN is less resource intensive.

  ---

  Explanation

  Multicast-Signaled VXLAN:

  In traditional multicast-signaled VXLAN, VTEPs (VXLAN Tunnel Endpoints) use multicast to flood and learn about remote VTEPs. This method relies on multicast in the underlay network to distribute BUM (Broadcast, Unknown unicast, and

  Multicast) traffic.

  This approach can be resource-intensive due to the need for multicast group management and increased network traffic, especially in large deployments.

  EVPN-Signaled VXLAN:

  EVPN-signaled VXLAN uses BGP (Border Gateway Protocol) to signal the presence of VTEPs and distribute MAC address information. BGP is used for VTEP autodiscovery and the distribution of endpoint information.

  This method is more efficient because it reduces the reliance on multicast, instead using BGP control-plane signaling to handle VTEP discovery and MAC learning, which reduces the overhead on the network and improves scalability.

  Correct Statements:

  B. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using BGP:This is correct because EVPN uses BGP for VTEP autodiscovery, making it more efficient and scalable compared to multicast-based methods.

  C. An EVPN-signaled VXLAN is less resource-intensive:This is correct because it eliminates the need for multicast flooding in the underlay, instead using BGP for signaling, which is less demanding on network resources.

  Incorrect Statements:

  A. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using IS-IS:This is incorrect because EVPN relies on BGP, not IS-IS, for VTEP discovery and signaling.

  D. An EVPN-signaled VXLAN features slower and more complete convergence:This is incorrect; EVPN with BGP typically provides faster convergence due to its use of a control plane rather than relying on data plane learning.

  Data Center

  References:

  EVPN-VXLAN is widely adopted in modern data center designs due to its scalability, efficiency, and reduced resource consumption compared to multicast-based VXLAN solutions. It leverages the strengths of BGP for control-plane-driven

  operations, resulting in more efficient and scalable networks.

• Question 64:

  Exhibit.

  

  You have a sample configuration for connecting two sites through EVPN-VXLAN by exchanging IP prefix routes.

  Referring to the exhibit, which two statements regarding the configuration are true? {Choose two.)

  A. The advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 5 route.
  B. The advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 2 route.
  C. The VNI must match on all devices for the same customer.
  D. The VNI should be unique on all devices for each customer site.
  A. The advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 5 route.
  C. The VNI must match on all devices for the same customer.

  ---

  Explanation

  EVPN-VXLAN Configuration:

  The configuration provided in the exhibit shows an EVPN-VXLAN setup where IP prefix routes are exchanged between two sites. The advertise direct-nexthop option and the VNI (Virtual Network Identifier) settings are crucial in this context.

  Advertise Direct-Nexthop:

  Option A:The advertise direct-nexthop option ensures that the next-hop route is resolved using only the information carried in the EVPN Type 5 route. Type 5 routes are used for IP prefix advertisement in EVPN, which is key to enabling Layer

  3 interconnectivity between different VXLAN segments.

  VNI Consistency:

  Option C:For the same customer across different devices, the VNI must be consistent. This consistency ensures that all devices can correctly map traffic to the appropriate VXLAN segment, maintaining seamless Layer 2 and Layer 3

  connectivity.

• Question 65:

  Which two statements are correct about an IP fabric? (Choose two.)

  A. All leaf devices can use the same AS number in an IP fabric without making any adjustments to the EBGP configuration
  B. The multipath multiple-as statement is required to enable ECMP if every device has a different AS number.
  C. Only a single point to point EBGP session is required between peers in an IP fabric.
  D. FBGP is only required to route mostrouting information to external devices outside the fabric.
  A. All leaf devices can use the same AS number in an IP fabric without making any adjustments to the EBGP configuration
  B. The multipath multiple-as statement is required to enable ECMP if every device has a different AS number.

  ---

  Explanation

  BGP in IP Fabric:

  In an IP fabric, Border Gateway Protocol (BGP) is used to manage the routing between leaf and spine devices. Each device can have the same or different Autonomous System (AS) numbers depending on the network design.

  Multipath Multiple-AS:

  Option B:If every device in the fabric has a different AS number, then enabling Equal-Cost Multi-Path (ECMP) routing requires the multipath multiple-as statement. This configuration allows BGP to consider multiple paths across different AS

  numbers as equal cost, enabling efficient load balancing across the network.

  Same AS Number Configuration:

  Option A:It's possible for all leaf devices to use the same AS number in an IP fabric, which simplifies the configuration. EBGP (External BGP) will still function correctly in this setup because BGP considers the peering relationship rather than

  strictly enforcing different AS numbers in this specific use case.

  Conclusion:

  Option B:Correct--This statement is essential for enabling ECMP in a multi-AS environment.

  Option A:Correct--Leaf devices can share the same AS number without needing special EBGP configuration.