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Exam Dumps JN0-683 Pdf, Valid JN0-683 Exam Labs

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Juniper Data Center, Professional (JNCIP-DC) Sample Questions (Q10-Q15):

NEW QUESTION # 10
Your organization is implementing EVPN-VXLAN and requires multiple overlapping VLAN-IDs. You decide to use a routing-instance type mac-vrf to satisfy this request.
Which two statements are correct in this scenario? (Choose two.)

A. Host-facing interfaces must be configured using enterprise-style configuration.
B. Host-facing interfaces must be configured using a service-provider style configuration.
C. Spine-facing interfaces must be configured using an enterprise-styleconfiguration.
D. The routing-instance service type can be VLAN-based.

Answer: B,D

Explanation:
* Understanding the Scenario:
* EVPN-VXLAN deployments often involve scenarios where multiple tenants or applications require overlapping VLAN IDs, which can be managed using the mac-vrf routing instance type.
This allows you to segregate traffic within the same VLAN ID across different tenants.
* Host-facing Interface Configuration:
* A. Host-facing interfaces must be configured using a service-provider style configuration:
This is correct. In mac-vrf configurations, host-facing interfaces (those connecting end devices) typically follow a service-provider style configuration, where each customer or tenant's traffic is isolated even if overlapping VLAN IDs are used.
* B. Host-facing interfaces must be configured using enterprise-style configuration:This is incorrect for mac-vrf instances because enterprise-style configurations are more common in simpler, less segmented networks.
* Routing Instance Service Type:
* D. The routing-instance service type can be VLAN-based:This is correct. The service type in mac-vrf can indeed be VLAN-based, which is particularly useful in scenarios where VLAN ID overlap is needed between different tenants or services.
Data Center References:
* The mac-vrf instance type is powerful for handling complex multi-tenant environments in EVPN- VXLAN, especially when dealing with overlapping VLAN IDs across different segments of the network.

NEW QUESTION # 11
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 VNI should be unique on all devices for each customer site.
C. The advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 2 route.
D. The VNI must match on all devices for the same customer.

Answer: A,D

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.

NEW QUESTION # 12
Exhibit.

You are troubleshooting an IP fabric (or your data center. You notice that your traffic is not being load balanced to your spine devices from your leaf devices. Referring to the configuration shown in the exhibit, what must be configured to solve this issue?

A. The load-balance policy must be applied as an export policy to your BGP
B. The multipastmultiple -as configuration must be configured for each peer in the BGP spine group.
C. The load-balance policy must be applied to the forwarding table under the routing-options hierarchy.
D. The load-balance policy must have a from statement that matches on protocol bgp.

Answer: B

Explanation:
* IP Fabric Load Balancing:
* In the provided configuration, traffic is not being load-balanced to the spine devices. The issue likely relates to how BGP routes are being selected and whether Equal-Cost Multi-Path (ECMP) is functioning correctly.
* Multipath Multiple-AS:
* Option B:The multipath multiple-as configuration is essential when using BGP in an IP fabric where devices belong to different Autonomous Systems (AS). This setting allows BGP to consider multiple paths (even across different AS numbers) as equal cost, enabling ECMP and proper load balancing across spine devices.
Conclusion:
* Option B:Correct-The multipath multiple-as configuration is necessary for achieving ECMP and effective load balancing in a multi-AS BGP environment.

NEW QUESTION # 13
Exhibit.

A VXLAN tunnel has been created between leaf1and Ieaf2 in your data center. Referring to the exhibit, which statement is correct?

A. Traffic sent from server1to server2 will be tagged with VLAN ID 100 on Ieaf2 and forwarded to server2.
B. Traffic sent from server1to server2 will be dropped on leaf1.
C. Traffic sent from server1to server2 will be dropped on Ieaf2.
D. Traffic sent from server1to server2 will be tagged with VLAN ID 200 on Ieaf2 and forwarded to server2.

Answer: D

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 References:
* 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.

NEW QUESTION # 14
A local VTEP has two ECMP paths to a remote VTEP
Which two statements are correctwhen load balancing is enabled in this scenario? (Choose two.)

A. The inner packet fields are used in the hash for load balancing.
B. The source port in the UDP header is used to load balance VXLAN traffic.
C. The inner packet fields are not used in the hash for load balancing.
D. The destination port in the UDP header is used to load balance VXLAN traffic.

Answer: A,B

Explanation:
* Load Balancing in VXLAN:
* VXLAN uses UDP encapsulation to transport Layer 2 frames over an IP network. For load balancing across Equal-Cost Multi-Path (ECMP) links, various fields in the packet can be used to ensure even distribution of traffic.
* Key Load Balancing Fields:
* C. The source port in the UDP header is used to load balance VXLAN traffic:This is correct.
The source UDP port in the VXLAN packet is typically calculated based on a hash of the inner packet's fields. This makes the source port vary between packets, enabling effective load balancing across multiple paths.
* D. The inner packet fields are used in the hash for load balancing:This is also correct. Fields such as the source and destination IP addresses, source and destination MACaddresses, and possibly even higher-layer protocol information from the inner packet can be used to generate the hash that determines the ECMP path.
* Incorrect Statements:
* A. The inner packet fields are not used in the hash for load balancing:This is incorrect as the inner packet fields are indeed critical for generating the hash used in load balancing.
* B. The destination port in the UDP header is used to load balance VXLAN traffic:This is incorrect because the destination UDP port in VXLAN packets is typically fixed (e.g., port 4789 for VXLAN), and therefore cannot be used for effective load balancing.
Data Center References:
* Effective load balancing in VXLAN is crucial for ensuring high throughput and avoiding congestion on specific links. By using a combination of the source UDP port and inner packet fields, the network can distribute traffic evenly across available paths.

NEW QUESTION # 15
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