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Juniper JN0-683 Exam
Data Center Professional (Page 4 )

Updated On: 1-Feb-2026
Page 2 of 14
PDF with 65 Questions

Exhibit.



A VXLAN tunnel has been created between leaf1 and Ieaf2 in your data center. Referring to the exhibit, which statement is correct?

  1. Traffic sent from server1 to server2 will be dropped on Ieaf2.
  2. Traffic sent from server1 to server2 will be tagged with VLAN ID 100 on Ieaf2 and forwarded to server2.
  3. Traffic sent from server1 to server2 will be tagged with VLAN ID 200 on Ieaf2 and forwarded to server2.
  4. Traffic sent from server1 to server2 will be dropped on leaf1.

Answer(s): C

Explanation:

Understanding VXLAN Tunneling:
VXLAN (Virtual Extensible LAN) is a network virtualization technology that addresses the scalability issues associated with traditional VLANs. VXLAN encapsulates Ethernet frames in UDP, allowing Layer 2 connectivity to extend across Layer 3 networks.
Each VXLAN network is identified by a unique VXLAN Network Identifier (VNI). In this exhibit, we have two VNIs, 5100 and 5200, assigned to the VXLAN tunnels between leaf1 and leaf2.
Network Setup Details:
Leaf1: Connected to Server1 with VLAN ID 100 and associated with VNI 5100. Leaf2: Connected to Server2 with VLAN ID 200 and associated with VNI 5200. Spine: Acts as the interconnect between leaf switches.
Traffic Flow Analysis:
When traffic is sent from Server1 to Server2, it is initially tagged with VLAN ID 100 on leaf1. The traffic is encapsulated into a VXLAN packet with VNI 5100 on leaf1. The packet is then sent across the network (via the spine) to leaf2. On leaf2, the VXLAN header is removed, and the original Ethernet frame is decapsulated. Leaf2 will then associate this traffic with VLAN ID 200 before forwarding it to Server2.
Correct Interpretation of the Exhibit:
The traffic originating from Server1, which is tagged with VLAN ID 100, will be encapsulated into VXLAN and transmitted to leaf2.
Upon arrival at leaf2, it will be decapsulated, and since it is associated with VNI 5200 on leaf2, the traffic will be retagged with VLAN ID 200.
Therefore, the traffic will reach Server2 tagged with VLAN ID 200, which matches the network configuration shown in the exhibit.
Data Center


Reference:

This configuration is typical in data centers using VXLAN for network virtualization. It allows isolated Layer 2 segments (VLANs) to be stretched across Layer 3 boundaries while maintaining distinct VLAN IDs at each site.
This approach is efficient for scaling large data center networks while avoiding VLAN ID exhaustion and enabling easier segmentation.
In summary, the correct behavior, as per the exhibit and the detailed explanation, is that traffic sent from Server1 will be tagged with VLAN ID 200 when it reaches Server2 via leaf2. This ensures proper traffic segmentation and handling across the VXLAN-enabled data center network.



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.)

  1. Configure the set switch-options route-distinguisher 192.168.100.51:2 parameter on Leaf-1.
  2. Configure the set switch-options service-id 1 parameter on Leaf-2.
  3. Configure the set switch-options vtep-source-interface 100. 0 parameter on Leaf-1.
  4. Configure the set switch-options vrf-target target: 65000:55 parameter on Leaf-2.

Answer(s): B,D

Explanation:

Review of the Exhibit:
The exhibit shows the switch configuration for Leaf-1 and Leaf-2. The configurations include route distinguishers, VRF targets, and service IDs, all of which are crucial for ensuring proper operation in an EVPN-VXLAN environment.

Service-ID Consistency:
The service ID must be consistent across all participating leaf devices in the same EVPN instance to ensure that they are part of the same VXLAN overlay network.
VRF Target Consistency:
The vrf-target parameter must also be consistent across devices to ensure that VRFs (Virtual Routing and Forwarding instances) are correctly imported and exported between leaf nodes.
Conclusion:
Option B: Correct--Setting the same service-id on Leaf-2 ensures that it is part of the same VXLAN overlay as Leaf-1.
Option D: Correct--The vrf-target on Leaf-2 should match Leaf-1 to ensure consistent routing policies and proper route exchange.



Which two statements are true about a pure IP fabric? (Choose two.)

  1. Devices in an IP fabric function as Layer 3 routers.
  2. An IP fabric supports Layer 2 VLANs.
  3. Devices in an IP fabric must be connected to a fabric controller.
  4. An IP fabric does not support Layer 2 protocols.

Answer(s): A,D

Explanation:

Understanding Pure IP Fabric:
A pure IP fabric is a network design where all devices operate at Layer 3, meaning that each device in the fabric is a router that makes forwarding decisions based on IP addresses.
Layer 2 Support:
In a pure IP fabric, traditional Layer 2 protocols such as Spanning Tree Protocol (STP) or VLANs are not supported. Instead, the network relies entirely on Layer 3 routing protocols to manage traffic between devices.
Routing Functionality:
Since devices in an IP fabric operate as Layer 3 routers, they handle IP routing and provide network services based on IP addresses, not on MAC addresses or Layer 2 switching.
Conclusion:
Option A: Correct--Devices in an IP fabric function as Layer 3 routers. Option D: Correct--A pure IP fabric does not support traditional Layer 2 protocols, making it a purely routed environment.



Which two statements are true about IP fabrics using unnumbered BGP? (Choose two.)

  1. Unnumbered BGP requires that family inet6 is configured on each interface.
  2. Unnumbered BGP peering automatically provisions IPv6 peering.
  3. Unnumbered BGP requires that family inet is configured on each interface.
  4. Unnumbered BGP peering automatically provisions IPv4 peering.

Answer(s): C,D

Explanation:

Understanding Unnumbered BGP:
Unnumbered BGP (Border Gateway Protocol) allows BGP peering between routers without assigning specific IP addresses to the interfaces. Instead, it uses the loopback address or another router identifier for the BGP session, making IP address management more straightforward in large-scale networks.
Family inet Configuration:
Option C: The family inet configuration is required on each interface involved in unnumbered BGP peering to support IPv4 address families. This ensures that IPv4 peering sessions can be established between devices.
Automatic IPv4 Peering:
Option D: Unnumbered BGP peering automatically provisions IPv4 peering sessions. This simplifies the configuration by eliminating the need to manually assign and manage IP addresses for BGP peering.
Conclusion:
Option C: Correct--Unnumbered BGP requires the family inet configuration for IPv4. Option D: Correct--Unnumbered BGP automatically provisions IPv4 peering, simplifying setup.



You are asked to implement VXLAN group-based policies (GBPs) in your data center.
Which two statements are correct in (his scenario? (Choose two.)

  1. VXLAN GBP uses scalable group tags that must be configured statically on each switch and activated through 802.1X.
  2. VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X.
  3. VXLAN GBP ensures consistent application of security group policies throughout the network.
  4. VXLAN GBP ensures consistent application of BGP groups throughout the network.

Answer(s): B,C

Explanation:

VXLAN Group-Based Policies (GBP):
VXLAN Group-Based Policies are used to apply security policies consistently across the network. These policies are often tied to user or device identities rather than static IP addresses, which allows for more dynamic and scalable security management.
Scalable Group Tags via RADIUS and 802.1X:
Option B: VXLAN GBP can use scalable group tags configured on a RADIUS server, which are then pushed to network devices through 802.1X. This allows for centralized and automated policy application based on user or device identity.
Consistent Security Policy Application:
Option C: GBP ensures that security policies are consistently applied across the network, regardless of where a user or device connects. This consistency is crucial in environments where security policies must follow the user or device.
Conclusion:
Option B: Correct--Group tags can be configured on a RADIUS server and pushed via 802.1X, enabling centralized policy management.
Option C: Correct--GBP ensures consistent application of security policies, which is essential for maintaining security across a dynamic network environment.



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