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Juniper JN0-683 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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.
Topic 2
  • Data Center Deployment and Management: This section assesses the expertise of data center networking professionals like architects and engineers, focusing on key deployment concepts. Topics include Zero-touch provisioning (ZTP), which automates device setup in data centers without manual input.
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 (Q104-Q109):

NEW QUESTION # 104
Exhibit.

Referring to the exhibit, when Host A sends an ARP request for Host B's IP address, which Junos feature does leaf1 require to send an ARP response back to Host A without having to send a broadcast frame over the fabric?

Answer: B

Explanation:
* Scenario Overview:
* In the exhibit, Host A is trying to resolve Host B's IP address (10.10.1.2) through ARP (Address Resolution Protocol). Normally, an ARP request would be broadcasted over the network, and the host owning the IP address (Host B) would respond.
* Role of Proxy ARP:
* Option A:Proxy ARPallows a router or switch (in this case, leaf1) to respond to ARP requests on behalf of another host. Leaf1, knowing the MAC address of Host B through the EVPN MAC advertisement, can reply to Host A's ARP request directly without broadcasting the request across the entire network fabric. This feature reduces unnecessary traffic and increases network efficiency.
Conclusion:
* Option A:Correct-Proxy ARP enables leaf1 to respond to Host A's ARP request for Host B's IP without broadcasting over the IP fabric, thus providing the ARP response locally.


NEW QUESTION # 105
Click the Exhibit button.

Referring to the exhibit, which two statements are true for the entry that uses the
02:05:86:d9:1b:00 MAC address? (Choose two.)

Answer: B,D

Explanation:
The MAC entry is associated with a vtep logical interface and shows a remote active source IP, indicating it was learned from a remote VTEP. As a result, traffic destined to that MAC is encapsulated and forwarded across the fabric using a VXLAN tunnel toward the remote VTEP.


NEW QUESTION # 106
Exhibit.

You are troubleshooting a DCI connection to another data center The BGP session to the provider is established, but the session to Border-Leaf-2 is not established. Referring to the exhibit, which configuration change should be made to solve the problem?

Answer: A

Explanation:
* Understanding the Configuration:
* The exhibit shows a BGP configuration on a Border-Leaf device. The BGP group UNDERLAY is used for the underlay network, OVERLAY for EVPN signaling, and PROVIDER for connecting to the provider network.
* The OVERLAY group has the accept-remote-nexthop statement, which is designed to accept the next-hop address learned from the remote peer as is, without modifying it.
* Problem Identification:
* The BGP session to Border-Leaf-2 is not established. A common issue in EVPN-VXLAN environments is related to next-hop reachability, especially when accept-remote-nexthop is configured.
* In typical EVPN-VXLAN setups, the next-hop address should be reachable within the overlay network. However, the accept-remote-nexthop can cause issues if the next-hop IP address is not directly reachable or conflicts with the expected behavior in the overlay.
* Corrective Action:
* D. delete protocols bgp group OVERLAY accept-remote-nexthop:Removing this command will ensure that the device uses its own IP address as the next-hop in BGP advertisements, which is standard practice in many EVPN-VXLAN setups. This change should help establish the BGP session with Border-Leaf-2.
Data Center References:
* Proper handling of BGP next-hop attributes is critical in establishing and maintaining stable BGP sessions, especially in complex multi-fabric environments like EVPN-VXLAN. Removing accept- remote-nexthop aligns with best practices in many scenarios.


NEW QUESTION # 107
Click the Exhibit button.

You have implemented an ERB overlay topology with an EBGP underlay. VXLAN tunnels are forming with the spine device as the VTEP.
Referring to the exhibit, which change must be made to the group overlay configuration?

Answer: D

Explanation:
In an eBGP EVPN overlay, the spine will, by default, rewrite the BGP next-hop when advertising EVPN routes to other peers, which makes the spine appear as the VTEP and causes VXLAN tunnels to form toward it. Enabling the no-nexthop-change behavior preserves the original leaf's VTEP next-hop so VXLAN tunnels form between the leaf VTEPs instead of to the spine.


NEW QUESTION # 108
In a centrally-routed bridging (CRB) overlay, which device typically performs the Layer 3 gateway function?

Answer: D

Explanation:
In a centrally-routed bridging (CRB) architecture, the IRB interfaces and Layer 3 gateway functionality reside on the spine devices, while the leaf devices operate purely at Layer 2 performing VXLAN bridging. This centralizes routing decisions but can introduce additional hops for inter-VLAN traffic compared to an edge-routed bridging design.


NEW QUESTION # 109
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