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Juniper JN0-683 Exam Syllabus Topics:

Topic	Details
Topic 1	Data Center Interconnect: For Data Center Engineers, this part focuses on interconnecting data centers, covering Layer 2 and Layer 3 stretching, stitching fabrics together, and using EVPN-signaled VXLAN for seamless communication between data centers.
Topic 2	VXLAN: This part requires knowledge of VXLAN, particularly how the control plane manages communication between devices, while the data plane handles traffic flow. Demonstrate knowledge of how to configure, Monitor, or Troubleshoot VXLAN.
Topic 3	EVPN-VXLAN Signaling: This section assesses an understanding of Ethernet VPN (EVPN) concepts, including route types, multicast handling, and Multiprotocol BGP (MBGP). It also covers EVPN architectures like CRB and ERB, MAC learning, and symmetric routing.

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Juniper Data Center, Professional (JNCIP-DC) Sample Questions (Q91-Q96):

NEW QUESTION # 91
Why is a designated forwarder required in a multihomed CE-to-PE VXLAN environment using EVPN signalling?

A. The designated forwarder is required to prevent packets from looping between the PEs.
B. The designated forwarder is required to prevent duplicate packets from being received on multihomed hosts.
C. The designated forwarder is required to prevent a traffic storm from being received on multihomed hosts.
D. The designated forwarder is required to prevent flooding of MAC addresses to multihomed hosts.

Answer: B

Explanation:
The designated forwarder is required to prevent duplicate packets from being received on multihomed hosts: In a multihomed CE-to-PE VXLAN environment using EVPN signaling, a host may be connected to more than one PE. Without a designated forwarder, both PEs could forward the same broadcast, multicast, or unicast traffic to the multihomed host, leading to duplicate packets. The designated forwarder ensures that only one PE forwards traffic to the host, preventing this issue.

NEW QUESTION # 92
Click the Exhibit button.

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

Answer: C,D

Explanation:
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.
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.

NEW QUESTION # 93
You are preparing an sFlow monitoring system configuration.
In this scenario, what Information will be included in the datagram sent to the sFlow collector? (Choose two.)

A. the CRC from the sampled packet
B. the source and destination VLAN for sampled packets
C. the interlace through which the packets entered the agent
D. the sending device's serial number

Answer: B,C

Explanation:
* Understanding sFlow Monitoring:
* sFlow is a packet sampling technology used to monitor traffic in a network. It sends sampled packet data and interface counters to an sFlow collector, which analyzes the traffic patterns.
* Information Included in sFlow Datagram:
* Option A:The datagram sent to the sFlow collector includes information about the interface through which the packets entered the agent (the switch or router). This is crucial for understanding where in the network the traffic was captured.
* Option D:sFlow datagrams also include the source and destination VLAN for the sampled packets. This allows for detailed analysis of the traffic flow within different VLANs.
Conclusion:
* Option A:Correct-The ingress interface is included in the sFlow datagram.
* Option D:Correct-The source and destination VLANs are also included, providing context for the sampled traffic.

NEW QUESTION # 94
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 destination port in the UDP header is used to load balance VXLAN traffic.
B. The inner packet fields are not used in the hash for load balancing.
C. The inner packet fields are used in the hash for load balancing.
D. The source port in the UDP header is used to load balance VXLAN traffic.

Answer: C,D

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 # 95
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 VNI should be unique on all devices for each customer site.
B. The VNI must match on all devices for the same customer.
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 advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 5 route.

Answer: B,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 # 96
......

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