Free Juniper JN0-683 Exam Dumps August 2026

Zero-Touch Provisioning (ZTP):

ZTP is a feature that allows for the automatic provisioning of devices with minimal manual intervention. It is widely used in large-scale deployments to quickly bring new devices online.

Key Requirements for ZTP:

A . DHCP Server: A DHCP server is crucial for ZTP as it provides the necessary information to new devices, such as the IP address, the location of the software image, and configuration files.

D . File Server: The file server is where the software image and configuration files are stored. The device downloads these files during the provisioning process.

Incorrect Options:

B . Syslog Server: While a syslog server is important for logging and monitoring, it is not a requirement for the initial provisioning process.

C . NTP Server: An NTP server is used for time synchronization, which is essential for accurate logging and operation but not specifically required for ZTP.

Data Center Reference:

ZTP simplifies the deployment process by automating the initial configuration steps, relying heavily on DHCP for communication and a file server for delivering the necessary configuration and software.

Issue Overview:

The leaf devices in an IP fabric using eBGP are advertising and receiving all routes, but the routes are not being installed in the routing table and are marked as hidden. This typically indicates an issue with the BGP configuration, particularly with next-hop handling or AS path concerns.

Corrective Actions:

B . You need to configure a next-hop self policy: This action ensures that the leaf devices modify the next-hop attribute to their own IP address before advertising routes to their peers. This is particularly important in eBGP setups where the next-hop may not be directly reachable by other peers.

D . You need to configure multipath multiple-as: This setting allows the router to accept multiple paths from different autonomous systems (ASes) and use them for load balancing. Without this, the BGP process might consider only one path and mark others as hidden.

Incorrect Statements:

A . You need to configure as-override: AS-override is used to replace the AS number in the AS-path attribute to prevent loop detection issues in MPLS VPNs, not in a typical eBGP IP fabric setup.

C . You need to configure loops 2: There is no specific BGP command loops 2 relevant to resolving hidden routes in this context. It might be confused with allowas-in, which is used to allow AS path loops under certain conditions.

Data Center Reference:

Proper BGP configuration is crucial in IP fabrics to ensure route propagation and to prevent routes from being marked as hidden. Configuration parameters like next-hop self and multipath multiple-as are common solutions to ensure optimal route installation and load balancing in a multi-vendor environment.

Controlling Traffic Within a Tenant's Network:

The requirement is to limit access to specific traffic types within a tenant's network without routing all tenant traffic through a firewall. This requires a selective method that can direct specific types of traffic to different paths based on the nature of the traffic.

Filter-Based Forwarding (FBF):

FBF is a technique that allows for routing decisions based on filters applied to the traffic, such as matching on source IP addresses, destination IP addresses, or even specific application types (like HTTP or FTP). This allows specific types of traffic to be forwarded to a specific next hop (e.g., a firewall) without affecting the entire traffic flow within the tenant's network.

Conclusion:

Option B: Correct---Filter-based forwarding allows for granular control of traffic, ensuring that only specific types of traffic within the tenant's network are redirected through a firewall, satisfying the requirement.

Zero Touch Provisioning (ZTP):

ZTP allows for the automated configuration of network devices, like QFX Series switches, without manual intervention. During ZTP, a switch will obtain its configuration from a DHCP server and then download the required software and configuration files from a specified server (e.g., FTP, HTTP).

DHCP Server Configuration:

Option B: The DHCP server needs to know the MAC address for each QFX5120 to provide a specific configuration based on the device identity. By mapping the MAC address to a particular configuration, the DHCP server can ensure that each switch gets the correct configuration.

Option D: The management IP address for each QFX5120 must also be assigned by the DHCP server. This IP address allows the device to communicate on the network and access the configuration files and other required resources during the ZTP process.

Conclusion:

Option B: Correct---MAC addresses allow the DHCP server to identify each QFX5120 and assign the appropriate configuration.

Option D: Correct---Management IP addresses are essential for network communication during ZTP.

Understanding DCI (Data Center Interconnect) Schemes:

DCI schemes are used to connect multiple data centers, enabling seamless communication and resource sharing between them. The choice of DCI depends on the specific requirements, such as isolation, VNI translation, or routing domain separation.

VXLAN Stitching:

VXLAN stitching involves connecting multiple VXLAN segments, allowing VNIs (VXLAN Network Identifiers) from different segments to communicate with each other while maintaining separate routing domains.

This approach is particularly effective for keeping routing domains isolated while supporting VNI translation, making it ideal for scenarios where you need to connect different data centers or networks without merging their control planes.

Other Options:

A . MPLS DCI label exchange: This option typically focuses on MPLS-based interconnections and does not inherently support VNI translation or isolation in the context of VXLAN.

B . Over the top (OTT) with VNI translation enabled: This could support VNI translation but does not inherently ensure routing domain isolation.

D . Over the top (OTT) with proxy gateways: This typically involves using external gateways for traffic routing and may not directly support VNI translation or isolation in the same way as VXLAN stitching.

Data Center Reference:

VXLAN stitching is a powerful method in multi-data center environments, allowing for flexibility in connecting various VXLAN segments while preserving network isolation and supporting complex interconnect requirements.

Understanding VRF and Routing Instances:

In an EVPN-VXLAN overlay network, multiple tenants are separated using unique VRF (Virtual Routing and Forwarding) instances. Each VRF instance maintains its own routing table, allowing for isolated routing domains within the same network infrastructure.

Role of Route Distinguisher:

Route Distinguisher (RD): The RD is a unique identifier used in MPLS and EVPN environments to distinguish routes belonging to different VRFs. The RD is prepended to the IP address in the route advertisement, ensuring that routes from different tenants remain unique even if they use the same IP address range.

Correct Property:

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 MAC addresses, 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 Reference:

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.

Understanding Oversubscription in a Clos Fabric:

The oversubscription ratio in a Clos IP fabric measures the ratio of the amount of edge (leaf) bandwidth to the core (spine) bandwidth. An oversubscription ratio of 3:1 means that there is three times more edge bandwidth compared to core bandwidth.

Impact of Adding/Removing Spine Devices:

Option C: If you remove spine devices, the total available core bandwidth decreases, while the edge bandwidth remains the same. This results in an increase in the oversubscription ratio because there is now less core bandwidth to handle the same amount of edge traffic.

Option B: Conversely, if you add spine devices, the total core bandwidth increases. This decreases the oversubscription ratio because more core bandwidth is available to handle the edge traffic.

Conclusion:

Option C: Correct---Removing spine devices increases the oversubscription ratio.

Option B: Correct---Adding spine devices decreases the oversubscription ratio.