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Juniper JN0-683 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	Data Center Multitenancy and Security: This section tests knowledge of single-tenant and multitenant data center setups. Candidates such as Data Center Professionals are evaluated on ensuring tenant traffic isolation at both Layer 2 and Layer 3 levels in shared infrastructure environments.
Topic 3	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 4	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.
Topic 5	Layer 3 Fabrics: This section measures the knowledge of professionals managing IP-based networks in data centers. It covers IP fabric architecture and routing, ensuring candidates understand how the network is structured for scalability and how traffic is routed efficiently.

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Juniper Data Center, Professional (JNCIP-DC) Sample Questions (Q112-Q117):

NEW QUESTION # 112
Which statement is correct about a collapsed fabric EVPN-VXLAN architecture?

A. Using Virtual Chassis at the leaf layer increases resiliency.
B. Border gateway functions occur on border leaf devices.
C. Fully meshed back-to-back links are needed between the spine devices.
D. It supports multiple vendors in the fabric as long as all the spine devices are Juniper devices deployed with L2 VTEPs

Answer: B

Explanation:
Border gateway functions occur on border leaf devices: In a collapsed fabric EVPN-VXLAN architecture, the border leaf devices are responsible for interconnecting the data center to external networks (such as the WAN or other data centers). These devices perform the border gateway functions, such as handling routing and bridging for external communication.

NEW QUESTION # 113
A customer has implemented an MX Series active/standby EVPN multihoming arrangement between six leaf devices. In this scenario, which statement is correct about the designated forwarder?

A. Only a single leaf router among a group of leaf routers attached to the Ethernet segment is allowed to forward traffic.
B. The designated forwarder advertises the autodiscovery route per Ethernet segment with an ESI MPLS label extended community that has the standby bit set to 0.
C. All leaf routers among a group of leaf routers attached to the Ethernet segment are allowed to forward traffic.
D. All leaf routers attached to the Ethernet segment are allowed to forward traffic.

Answer: A

Explanation:
In an active/standby EVPN multihoming arrangement, the designated forwarder election results in exactly one leaf router being permitted to forward traffic for that Ethernet segment, while the other multihomed peers remain in standby to prevent duplicate forwarding.

NEW QUESTION # 114
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. Devices in routing instance Customer A are able to communicate with devices in routing instance Customer B
B. Devices in irb.400 (vlan 400) and irb.800 (vlan 800) are able to communicate over the fabric.
C. Devices in irb.400 (vlan 400) are not able to communicate directly with devices in routing instance Customer A.
D. VNI 10006 is assigned to vlan 800 (irb.800).

Answer: B,C

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.

NEW QUESTION # 115
Which statement is true regarding the use of a route reflector in an EVPN-VXLAN overlay?

A. The route reflector must be placed on every leaf device.
B. The route reflector reduces the number of iBGP sessions required by reflecting overlay routes between leaf devices.
C. The route reflector participates in the data plane forwarding of VXLAN traffic.
D. The route reflector is only used for the underlay IGP.

Answer: B

Explanation:
In an EVPN-VXLAN overlay using iBGP, a route reflector allows leaf devices to establish a single iBGP session with the reflector instead of a full mesh of sessions with every other leaf. The route reflector then reflects EVPN routes between clients, reducing control-plane complexity and improving scalability, while typically not participating directly in VXLAN data-plane forwarding.

NEW QUESTION # 116
Exhibit.

The exhibit shows the truncated output of the show evpn database command.
Given this output, which two statements are correct about the host with MAC address 40:00:dc:01:00:04?
(Choose two.)

A. The host is originating from an ESI LAG.
B. The host is originating from irb.300.
C. The host is located on VN110002.
D. The host is assigned IP address 10.4.4.5.

Answer: A,D

Explanation:
* Understanding the Output:
* The show evpn database command output shows the MAC address, VLAN, active source, timestamp, and IP address associated with various hosts in the EVPN instance.
* Analysis of the MAC Address:
* Option A:The MAC address 40:00:dc:01:00:04 is associated with the IP address 10.4.4.5, as indicated by the output in the IP address column. This confirms that this host has been assigned the IP 10.4.4.5.
* Option D:The active source for the MAC address 40:00:dc:01:00:04 is listed as 00:02:00:00:00:
04:00:04:00:00:04:00:04, which indicates that the host is connected via an ESI (Ethernet Segment Identifier) LAG (Link Aggregation Group). This setup is typicallyused in multi-homing scenarios to provide redundancy and load balancing across multiple physical links.
Conclusion:
* Option A:Correct-The host with MAC 40:00:dc:01:00:04 is assigned IP 10.4.4.5.
* Option D:Correct-The host is originating from an ESI LAG, as indicated by the active source value.

NEW QUESTION # 117
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