Juniper JN0-683 Exam Practice Test Instant Access

Question 1

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?

AThe load-balance policy must be applied to the forwarding table under the routing-options hierarchy.

BThe multipast multiple -as configuration must be configured for each peer in the BGP spine group.

CThe load-balance policy must be applied as an export policy to your BGP

DThe load-balance policy must have a from statement that matches on protocol bgp.

Answer : B

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.

Question 2

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.)

AThe advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 5 route.

BThe advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 2 route.

CThe VNI must match on all devices for the same customer.

DThe VNI should be unique on all devices for each customer site.

Answer : A, C

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.

Question 3

You are asked to interconnect Iwo data centers using a method that provides EVPN Type 2 connectivity, is highly scalable, and limits VXLAN tunnels between border leaf devices. What will satisfy these requirements?

Aover the top full-mesh interconnect

BEVPN Type 2 stretch

CIP VPN

DType 2 seamless stitching

Answer : D

Requirement Analysis:

The scenario requires a solution to interconnect two data centers that supports EVPN Type 2 connectivity. The solution must be highly scalable and must minimize the number of VXLAN tunnels between border leaf devices.

Understanding Type 2 Seamless Stitching:

Option D: Type 2 seamless stitching is a method used in EVPN to provide Layer 2 connectivity (such as MAC address mobility) across different VXLAN segments. It is scalable because it allows only necessary tunnels to be established between border leaf devices, reducing the overhead of maintaining a full mesh of VXLAN tunnels.

Conclusion:

Option D: Correct---Type 2 seamless stitching satisfies the requirement by enabling scalable, efficient interconnection of two data centers with minimal VXLAN tunnels.

Question 4

Exhibit.

Referring to the exhibit, which statement is correct?

AVNI 100 is not configured on the remote VTEP.

BThe MAC address is unknown and not in the forwarding table of the remote VTEP.

CThe remote VTEP is not responding.

DThe MAC address is known but not reachable by the remote VTEP

Answer : B

Analyzing the Exhibit Output:

The command ping overlay tunnel-type vxlan is used to test the VXLAN tunnel between two VTEPs (VXLAN Tunnel Endpoints). The output shows a warning about missing hash parameters, but more importantly, it displays the result: End-System Not Present.

Understanding the Response:

The message End-System Not Present indicates that the remote VTEP (192.168.2.20) did not find the MAC address 00:00:5E:00:53:CC in its forwarding table. This typically means that the MAC address is unknown to the remote VTEP, and as a result, it could not forward the packet to the intended destination.

Conclusion:

Option B: Correct---The MAC address is unknown and is not in the forwarding table of the remote VTEP, which is why the system reports that the 'End-System' is not present.

Question 5

You are deploying a Clos IP fabric with an oversubscription ratio of 3:1.

In this scenario, which two statements are correct? (Choose two.)

AThe oversubscription ratio remains the same when you remove spine devices.

BThe oversubscription ratio decreases when you add spine devices.

CThe oversubscription ratio increases when you remove spine devices.

DThe oversubscription ratio remains the same when you add spine devices.

Answer : B, C

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.

Question 6

You are asked to automatically provision new Juniper Networks devices in your network with minimal manual intervention Before you begin, which two statements are correct? (Choose two.)

AYou must have a DHCP server that provides the location of the software image and configuration files.

BYou must have a system log (syslog) server to manage system log messages and alerts.

CYou must have an NTP server to perform time synchronization.

DYou must have a file server that stores software image and configuration files.

Answer : A, D

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.

Question 7

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?

Aset protocols bgp group overlay export loopbacks

Bdelete protocols bgp group UNDERLAY advertise-external

Cset protocols bgp group PROVIDER export LOOPBACKS

Ddelete protocols bgp group OVERLAY accept-remote-nexthop

Ddelete 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 Reference:
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.

Answer : D, D

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:

Juniper JN0-683 Data Center Professional Exam Practice Test