Question # 1
You want to ensure thatVXLAN traffic from the xe-0/0/12 interlace is being encapsulatedby logical vlep.32770 and sent to a remote leaf device in this scenario, which command would you use to verify that traffic is flowing? | A. monitor traffic interface xe-0/0/12 | B. show interface terse vtep.32770 | C. show interfaces terse vtep.32770 statistics | D. show interfaces vtep.32770 detail |
C. show interfaces terse vtep.32770 statistics
VXLAN Traffic Verification:
To ensure VXLAN traffic from the xe-0/0/12 interface is correctly encapsulated by the logical vtep.32770 and sent to a remote leaf device, it is essential to monitor the relevant interface statistics.
The command show interfaces terse vtep.32770 statistics provides a concise overview of the traffic statistics for the specific VTEP interface, which can help verify whether traffic is being correctly encapsulated and transmitted.
Explanation:
This command is particularly useful for quickly checking the traffic counters and identifying any potential issues with VXLAN encapsulation or transmission.
It allows you to confirm that traffic is flowing as expected, by checking the transmitted and received packet counters.
Data Center References:
Monitoring interface statistics is a crucial step in troubleshooting and validating network traffic, particularly in complex overlay environments like EVPN-VXLAN.
Question # 2
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.) | A. You must have a DHCP server that provides the location of the software image and configuration files. | B. You must have a system log (syslog) server to manage system log messages and alerts. | C. You must have an NTP server to perform time synchronization. | D. You must have a file server that stores software image and configuration files. |
A. You must have a DHCP server that provides the location of the software image and configuration files. D. You must have a file server that stores software image and configuration files.
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 References:
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 # 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 leafdevices. What will satisfy these requirements? | A. over the top full-mesh interconnect | B. EVPN Type 2 stretch | C. IP VPN | D. Type 2 seamless stitching |
D. Type 2 seamless stitching
Explanation:
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 stitchingis 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
You are deploying a Clos IP fabric with an oversubscription ratio of 3:1.
In this scenario, which two statements are correct? (Choose two.) | A. The oversubscription ratio remains the same when you remove spine devices. | B. The oversubscription ratio decreases when you add spine devices. | C. The oversubscription ratio increases when you remove spine devices. | D. The oversubscription ratio remains the same when you add spine devices. |
B. The oversubscription ratio decreases when you add spine devices. C. The oversubscription ratio increases when you remove spine devices.
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 youremove spine devices, the total available core bandwidth decreases, while the edge bandwidth remains the same. This results in anincrease in the oversubscription ratiobecause there is now less core bandwidth to handle the same amount of edge traffic.
Option B:Conversely, if youadd 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 # 5
You are asked to implement VXLAN group-based policies (GBPs) in your data center. Which two statements are correct in (his scenario? (Choose two.) | A. VXLAN GBP uses scalable group tags thatmust be configured statically on each switch and activated through 802.1X. | B. VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X. | C. VXLAN GBP ensures consistent application of security group policies throughout the network. | D. VXLAN GBP ensures consistent application of BGP groups throughout the network. |
B. VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X. C. VXLAN GBP ensures consistent application of security group policies throughout the network.
VXLAN Group-Based Policies (GBP):
VXLAN Group-Based Policies are used to apply security policies consistently across the network. These policies are often tied to user or device identities rather than static IP addresses, which allows for more dynamic and scalable security management.
Scalable Group Tags via RADIUS and 802.1X:
Option B:VXLAN GBP can use scalable group tags configured on a RADIUS server, which are then pushed to network devices through 802.1X. This allows for centralized and automated policy application based on user or device identity.
Consistent Security Policy Application:
Option C:GBP ensures that security policies are consistently applied across the network, regardless of where a user or device connects. This consistency is crucial in environments where security policies must follow the user or device.
Conclusion:
Option B:Correct—Group tags can be configured on a RADIUS server and pushed via 802.1X, enabling centralized policy management.
Option C:Correct—GBP ensures consistent application of security policies, which is essential for maintaining security across a dynamic network environment.
Question # 6
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 # 7
You are asked for TX and RX traffic statistics for each interface to which an application server is attached. The statistics need to be reported every five seconds. Using the Junos default settings, which telemetry method would accomplish this request?
| A. gNMI | B. SNMP | C. Native Sensors | D. OpenConfig |
C. Native Sensors
Explanation:
Telemetry Methods in Junos:
Telemetry is used to collect and report data from network devices. For high-frequency statistics reporting, such as every five seconds, you need a telemetry method that supports this level of granularity and real-time monitoring.
Junos Native Sensors:
Option C:Native Sensors in Junos provide detailed, high-frequency telemetry data, including TX and RX traffic statistics for interfaces. They are designed to offer real-time monitoring with customizable sampling intervals, making them ideal for the five-second reporting requirement.
Conclusion:
Option C:Correct—Native Sensors in Junos are capable of providing the required high-frequency telemetry data every five seconds.
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