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Juniper JN0-683 Exam Sample Questions


Question # 1

Whatare two ways in which an EVPN-signaled VXLAN is different from a multicast-signaled VXLAN? (Choose two.)
A. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using IS-IS.
B. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using BGP.
C. An EVPN-signaled VXLAN is less resource intensive.
D. An EVPN-signaled VXLAN features slower and more complete convergence.


B. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using BGP.
C. An EVPN-signaled VXLAN is less resource intensive.




Question # 2

Whatare two supported methods (or exporting data when using the Junos telemetry interface? (Choose two.)

A. using REST
B. using UDP
C. using SNMP
D. using gRPC


B. using UDP
D. using gRPC
Junos Telemetry Interface (JTI):

The Junos Telemetry Interface is a framework that allows network operators to collect real-time telemetry data from Juniper devices. This data can be used for monitoring, analytics, and network automation.

Data Export Methods:

Option B:UDP (User Datagram Protocol)is a lightweight, connectionless protocol used for exporting telemetry data quickly with minimal overhead. While it doesn't guarantee delivery, it is suitable for high-speed data transfer where occasional packet loss is acceptable.

Option D:gRPC (gRPC Remote Procedure Call)is a modern, high-performance method for data export that supports streaming and remote procedure calls, making it ideal for more complex telemetry data use cases.

Conclusion:

Option B:Correct—UDP is supported for exporting telemetry data.
Option D:Correct—gRPC is also supported, offering advanced streaming capabilities




Question # 3

You are asked to set up an IP fabric thatsupports Al or ML workloads. You have chosen to use lossless Ethernet in this scenario, which statement is correct about congestion management?
A. The switch experiencing the congestion notifies the source device.
B. Only the source and destination devices need ECN enabled.
C. ECN marks packets based on WRED settings.
D. ECN is negotiated only among the switches that make up the IP fabric for each queue.


A. The switch experiencing the congestion notifies the source device.
Understanding Lossless Ethernet and Congestion Management:

Lossless Ethernet is crucial for AI and ML workloads, where packet loss can significantly degrade performance. To implement lossless Ethernet, congestion management protocols like ECN (Explicit Congestion Notification) are used.

Role of ECN in Congestion Management:

Option A:In an IP fabric that supports lossless Ethernet, when a switch experiences congestion, it can mark packets using ECN. This marking notifies the source device of the congestion, allowing the source to reduce its transmission rate, thereby preventing packet loss.

Conclusion:

Option A:Correct—The switch experiencing congestion notifies the source device via ECN marking.




Question # 4

You are deploying an IP fabric with an oversubscription ratio of 3:1. In this scenario, which two statements are correct? (Choose two.)
A. The oversubscription ratio decreases when you add leaf devices.
B. The oversubscription ratio remains the same when you remove leaf devices.
C. The oversubscription ratio increases when you remove leaf devices.
D. The oversubscription ratio remains the same when you add leaf devices.


C. The oversubscription ratio increases when you remove leaf devices.
D. The oversubscription ratio remains the same when you add leaf devices.
Understanding Oversubscription Ratio in IP Fabrics:

The oversubscription ratio in an IP fabric typically refers to the ratio of the available bandwidth at the edge of the network (leaves) to the available bandwidth at the core or spine. A 3:1 oversubscription ratio means that for every 3 units of bandwidth at the leaves, there is 1 unit of bandwidth at the spine.

Impact of Adding or Removing Leaf Devices:

Removing Leaf Devices:When you remove leaf devices, the amount of total edge bandwidth decreases while the bandwidth in the spine remains constant. This causes the oversubscription ratio toincreasebecause there is now less total bandwidth to distribute across the same amount of spine bandwidth.

Adding Leaf Devices:Conversely, when you add leaf devices, the total edge bandwidth increases. Since the spine bandwidth remains the same, the oversubscription ratio would remain the same if the additional leaves consume their share of the available bandwidth proportionally.

Conclusion:

Option C:Correct—Removing leaf devices increases the oversubscription ratio.

Option D:Correct—Adding leaf devices typically maintains the oversubscription ratio assuming uniform bandwidth distribution.





Question # 5

You are asked to deploy 100 QFX Series devices using ZTP Each OFX5120 requires a different configuration. In this scenario, what are two components that you would configure on the DHCP server? (Choose two.)
A. the IP address of the FTP server
B. the MAC address for each OFX5120
C. the MAC address of the FTP server
D. the management IP address for each OFX5120


B. the MAC address for each OFX5120
D. the management IP address for each OFX5120
Explanation:

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 theMAC address for each QFX5120to 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:Themanagement IP address for each QFX5120must 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.




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