Question # 1
| What are three actions available tor MAC move limiting? (Choose three.) | | A. drop | | B. filter | | C. enable | | D. log | | E. shutdown |
A. drop
D. log
E. shutdown
Explanation:
MAC Move Limiting:
MAC move limiting is a security feature used in network switches to detect and mitigate rapid changes in MAC address locations, which could indicate a network issue or an attack such as MAC flapping or spoofing.
When a MAC address is learned on a different interface than it was previously learned, the switch can take various actions to prevent potential issues.
Available Actions:
A. drop:This action drops packets from the MAC address if it violates the move limit, effectively blocking communication from the offending MAC address.
D. log:This action logs the MAC move event without disrupting traffic, allowing network administrators to monitor and investigate the event.
E. shutdown:This action shuts down the interface on which the MAC address violation occurred, effectively stopping all traffic on that interface to prevent further issues.
Other Actions (Not Correct):
B. filter:Filtering is not typically associated with MAC move limiting; it generally refers to applying ACLs or other mechanisms to filter traffic.
C. enable:This is not an action related to MAC move limiting, as it does not represent a specific reaction to a MAC move event.
Data Center References:
MAC move limiting is crucial for maintaining network stability and security, particularly in environments with dynamic or large-scale Layer 2 networks where MAC addresses might frequently change locations.
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 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 # 4
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.
Question # 5
| 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 # 6
| You are selling up an EVPN-VXLAN architecture (or your new data center. thisinitial deployment will be less than 50 switches: however, it could scale up to 250 switches over time supporting 1024 VLANs. You are still deciding whether to use symmetric or asymmetric routing.
In this scenario, which two statements are correct? (Choose two.) | | A. Symmetric routing needs an extra VLAN with an IRB interface for each L3 VRF instance. | | B. Asymmetric routing is easier lo monitor because of the transit VNI. | | C. Symmetric routing supports higher scaling numbers. | | D. Asymmetric routing routes traffic on the egress switch. |
C. Symmetric routing supports higher scaling numbers.
D. Asymmetric routing routes traffic on the egress switch.
Explanation:
Symmetric vs. Asymmetric Routing in EVPN-VXLAN:
Symmetric Routing:Traffic enters and exits the VXLAN network through the same VTEP, regardless of the source or destination. This approach simplifies routing decisions, especially in large networks, and is generally more scalable.
Asymmetric Routing:The routing occurs on the egress VTEP. This method can be simpler to deploy in smaller environments but becomes complex as the network scales, particularly with larger numbers of VNIs and VLANs.
Correct Statements:
C. Symmetric routing supports higher scaling numbers:Symmetric routing is preferred in larger EVPN-VXLAN deployments because it centralizes routing decisions, which can be more easily managed and scaled.
D. Asymmetric routing routes traffic on the egress switch:This is accurate, as asymmetric routing means the routing decision is made at the final hop, i.e., the egress VTEP before the traffic reaches its destination.
Incorrect Statements:
A. Symmetric routing needs an extra VLAN with an IRB interface for each L3 VRF instance:This is not accurate. Symmetric routing does not require an extra VLAN per VRF; rather, it uses the same VLAN/VNI across the network, simplifying routing and VLAN management.
B. Asymmetric routing is easier to monitor because of the transit VNI:Asymmetric routing is not necessarily easier to monitor; in fact, it can add complexity due to the split routing logic between ingress and egress points.
Data Center References:
The choice between symmetric and asymmetric routing in an EVPN-VXLAN environment depends on network size, complexity, and specific operational requirements. Symmetric routing is generally more scalable and easier to manage in large-scale deployments.
Question # 7
| Which two statements are true about EVPN routes for Data Center Interconnect? (Choose two.) | | A. Type 5 EVPN routes require a VXLAN tunnel to the protocol next hop. | | B. Type 2 EVPN routes do not require a VXLAN tunnel to the protocol next hop. | | C. Type 2 EVPN routes require a VXLAN tunnel to the protocol next hop. | | D. Type 5 EVPN routes do not require a VXLAN tunnel to the protocol next hop. |
B. Type 2 EVPN routes do not require a VXLAN tunnel to the protocol next hop.
D. Type 5 EVPN routes do not require a VXLAN tunnel to the protocol next hop.
Type 2 EVPN Routes:
Type 2 routesadvertise MAC addresses within an EVPN instance and are used primarily for Layer 2 bridging. These routes do not require a VXLAN tunnel to the protocol next hop because they operate within the same Layer 2 domain.
Type 5 EVPN Routes:
Type 5 routesare used to advertise IP prefixes (Layer 3 routes) within EVPN. Similar to Type 2 routes, they do not require a VXLAN tunnel to the protocol next hop because they represent L3 routes, which are managed at the routing layer without the need for VXLAN encapsulation.
Conclusion:
Option B:Correct—Type 2 routes do not need a VXLAN tunnel to the next hop, as they are used for Layer 2.
Option D:Correct—Type 5 routes also do not need a VXLAN tunnel because they operate at Layer 3, handling IP prefixes.
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