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NEW QUESTION # 30
You are asked to interconnect two of your company's data centers across an IP backbone. Both data centers require Layer 2 and Layer 3 connectivity.
In this scenario, which three actions would accomplish this task? (Choose three.)
- A. Ensure border leaf nodes in each data center can exchange EVPN routes.
- B. Ensure there is a full mesh of VTEPs between all spine nodes within both data centers.
- C. Advertise Type 2 EVPN routes across the DCI.
- D. Advertise Type 5 EVPN routes across the DCI.
- E. Ensure there is a full mesh of VTEPs between all leaf nodes within data centers.
Answer: A,C,D
Explanation:
Advertise Type 5 EVPN routes across the DCI: Type 5 EVPN routes are used for advertising IP prefixes between different data centers. These routes allow Layer 3 connectivity between the two data centers. By advertising Type 5 EVPN routes across the Data Center Interconnect (DCI), you can establish Layer 3 communication between the data centers.
Advertise Type 2 EVPN routes across the DCI: Type 2 EVPN routes are used for MAC address learning and distribution. These routes ensure Layer 2 connectivity between data centers, which is required to extend VLANs across the DCI and allow devices in one data center to communicate with devices in another data center at Layer 2.
Ensure border leaf nodes in each data center can exchange EVPN routes: The border leaf nodes are responsible for routing traffic between the data centers and ensuring that Layer 2 and Layer 3 connectivity is maintained. These nodes need to exchange EVPN routes to properly advertise MAC addresses (for Layer 2) and IP prefixes (for Layer 3) between the data centers.
NEW QUESTION # 31
Click the Exhibit button. You are deploying a VXLAN overlay with EVPN as the control plane in an ERB architecture.
Referring to the exhibit, which three statements are correct about where then VXLAN gateways will be placed? (Choose three.)
- A. All leaf devices will have L2 VXLAN gateways.
- B. Spine devices will have no VXLAN gateways.
- C. Only the border and leaf devices will have L3 VXLAN gateways.
- D. Only the spine devices will have L2 VXLAN gateways.
- E. All leaf devices will have L3 VXLAN gateways.
Answer: A,B,C
Explanation:
Spine devices will have no VXLAN gateways: In a typical VXLAN-based architecture with EVPN, spine devices do not function as VXLAN gateways. Their role is to provide connectivity and forwarding for VXLAN traffic, but they do not act as gateways for Layer 2 or Layer 3.
Only the border and leaf devices will have L3 VXLAN gateways: In an EVPN-VXLAN setup, L3 VXLAN gateways are typically placed on the border and leaf devices. These devices are responsible for bridging between Layer 2 and Layer 3 domains, handling routing for traffic that needs to go between different VXLAN segments or between VXLAN and external networks.
All leaf devices will have L2 VXLAN gateways: Leaf devices often function as L2 VXLAN gateways. They handle the bridging between VXLAN segments and provide Layer 2 connectivity for hosts within the same VXLAN.
NEW QUESTION # 32
Exhibit.
Connections between hosts connected to Leaf-1 and Leaf-2 are not working correctly.
Referring to the exhibit, which two configuration changes are required to solve the problem? (Choose two.)
- A. Configure the set switch-options vrf-target target: 65000:55 parameter on Leaf-2.
- B. Configure the setswitch-options vtep-source-interface100. 0 parameter on Leaf-1.
- C. Configure the set switch-options service-id 1 parameter on Leaf-2.
- D. Configure the setswitch-options route-distinguisher 192.168.100.51:2 parameter on Leaf-1.
Answer: A,C
Explanation:
* Review of the Exhibit:
* The exhibit shows the switch configuration for Leaf-1 and Leaf-2. The configurations include route distinguishers, VRF targets, and service IDs, all of which are crucial for ensuring proper operation in an EVPN-VXLAN environment.
* Service-ID Consistency:
* The service ID must be consistent across all participating leaf devices in the same EVPN instance to ensure that they are part of the same VXLAN overlay network.
* VRF Target Consistency:
* The vrf-target parameter must also be consistent across devices to ensure that VRFs (Virtual Routing and Forwarding instances) are correctly imported and exported between leaf nodes.
Conclusion:
* Option B:Correct-Setting the same service-id on Leaf-2 ensures that it is part of the same VXLAN overlay as Leaf-1.
* Option D:Correct-The vrf-target on Leaf-2 should match Leaf-1 to ensure consistent routing policies and proper route exchange.
NEW QUESTION # 33
You are asked to build redundant gateways in your EVPN-VXLAN environment, but you must conserve address space because these gateways must span across seven PEs.
What should you implement on the PEs to satisfy these requirements?
- A. Use IRB interfaces with the same IP and MAC address.
- B. Use IRB interfaces with different IP addresses and the same VGA.
- C. Use IRB interfaces with the same IP address and different MAC addresses.
- D. Use IRB interfaces with the same IP and VGA.
Answer: A
Explanation:
In an EVPN-VXLAN environment, when you need redundant gateways across multiple PEs (for hosts in the same VLAN/VRF), you want all PEs to present a single logical gateway IP to the hosts.
This is achieved using anycast IRB:
Same IP address on all PEs → ensures hosts have a single default gateway.
Same MAC address on all PEs → ensures traffic is correctly forwarded to the closest PE without ARP conflicts.
This design conserves IP address space because you don't need a unique gateway IP for each PE.
NEW QUESTION # 34
You are deploying an EVPN-VXLAN overlay. You must ensure that Layer 3 routing happens on the spine devices. In this scenario, which deployment architecture should you use?
- A. distributed symmetric routing
- B. bridged overlay
- C. CRB
- D. ERB
Answer: C
Explanation:
In the CRB architecture, inter-VNI (Virtual Network Identifier) routing occurs on the spine switches, meaning the spine devices handle the Layer 3 routing. The leaf switches primarily provide Layer 2 bridging and VXLAN encapsulation/decapsulation, while routing between VXLAN segments is done centrally on the spines.
NEW QUESTION # 35
You are designing an IP fabric tor a large data center, and you are concerned about growth and scalability.
Which two actions would you take to address these concerns? (Choose two.)
- A. Design a five-stage Clos IP fabric.
- B. Design a three-stage Clos IP fabric.
- C. Use OFX5700 Series devices as the super spines.
- D. Use EX4300 Series devices as the spine devices.
Answer: B,C
Explanation:
* Clos IP Fabric Design:
* A Clos fabric is a network topology designed for scalable, high-performance data centers. It is typically arranged in multiple stages, providing redundancy, high bandwidth, and low latency.
* Three-Stage Clos Fabric:
* Option B:A three-stage Clos fabric, consisting of leaf, spine, and super spine layers, is widely used in data centers. This design scales well and allows for easy expansion by adding more leaf and spine devices as needed.
* Super Spines for Scalability:
* Option D:Using high-capacity devices like the QFX5700 Series as super spines can handle the increased traffic demands in large data centers and support future growth. These devices provide the necessary bandwidth and scalability for large-scale deployments.
Conclusion:
* Option B:Correct-A three-stage Clos fabric is a proven design that addresses growth and scalability concerns in large data centers.
* Option D:Correct-QFX5700 Series devices are suitable for use as super spines in large-scale environments due to their high performance.
NEW QUESTION # 36
Exhibit.
You have implemented an EVPN-VXLAN data center. Device served must be able to communicate with device server2.
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. An IRB Interface must be configured on leaf1 and Ieaf2.
- B. Traffic from server1 to server2 will transit a VXLAN tunnel to spinel or spine2. then a VXLAN tunnel from spinel or spine2 to Ieaf2.
- C. An IRB interface must be configured on spine1and spine2.
- D. Traffic from server! to server2 will transit the VXLAN tunnel between leaf1 and Ieaf2.
Answer: B,C
NEW QUESTION # 37
You are using E8GP peering in an underlay IP fabric. Which two statements are correct in this scenario?
(Choose two.)
- A. Every leaf node has a peering session to every other leaf node.
- B. Every leaf node has one peering session to every spine node.
- C. EBGP peering requires an IGP protocol tor adjacency establishment.
- D. EBGP peering does not require an IGP protocol tor adjacency establishment.
Answer: B,D
Explanation:
* Understanding EBGP in an IP Fabric:
* EBGP (External Border Gateway Protocol) is commonly used in IP fabrics to establish peering between routers, such as leaf and spine nodes, without relying on an Interior Gateway Protocol (IGP) like OSPF or IS-IS.
* IGP Requirement for EBGP:
* Option B:EBGP peering does not require an IGP for adjacency establishment. This is because EBGP peers are typically directly connected, and BGP establishes its own sessions without needing an underlying IGP.
* Leaf-to-Spine Peering:
* Option C:In a typical IP fabric, each leaf node establishes an EBGP session with every spine node. This ensures full connectivity between leaves and spines, facilitating efficient routing and forwarding within the fabric.
Conclusion:
* Option B:Correct-EBGP does not require an IGP for establishing peering sessions.
* Option C:Correct-Each leaf node peers with every spine node, which is a standard practice in IP fabrics to ensure connectivity and redundancy.
NEW QUESTION # 38
You are asked to configure telemetry on the OFX Series devices in your data center fabric. You want to use sensors that have a vendor-neutral data model Which type of sensor should you use in this scenario?
- A. Python sensors
- B. analog sensors
- C. JTI native sensors
- D. JTI OpenConfig sensors
Answer: D
Explanation:
* Telemetry in Data Centers:
* Telemetry allows for real-time monitoring of network devices by collecting and exporting data such as interface statistics, routing table updates, and other key metrics.
* Vendor-Neutral Data Models:
* Option A:JTI (Junos Telemetry Interface) OpenConfig sensors use a vendor-neutral data model, which is important for ensuring compatibility across different network devices and systems.
OpenConfig is an industry-standard model, which facilitates integration with various telemetry collection systems.
Conclusion:
* Option A:Correct-OpenConfig sensors provide a vendor-neutral solution for telemetry, ensuring broad compatibility and flexibility in data center environments.
NEW QUESTION # 39
Click the Exhibit button. Both DC and DC2 are using EVPN-VXLAN technology deployed using an ERB architecture. A server on the Red VLAN must communicate with a server on the Green VLAN. The Blue VLAN in DC and DC2 needs to be the same VLAN.
Which statement is correct?
- A. A lean super spine device must be added to DC and DC2; all VLANs must be stretched to the lean super spine device and the lean super spine devices must stitch all the VLANs together.
- B. The eight spine devices must be configured as border spine devices; a full mush interconnect must exist between all eight spine devices and the Blue VLAN must be stitched together
- C. An interconnect is required between the four SRX Series devices; the Blue VLAN must be stretched and a transit VNI must be added for the Red and Green VLANs.
- D. An interconnect is required between four leaf devices in the services blocks; the Red VLAN and the Green VLAN must be stitched and the Blue VLAN must be stretched.
Answer: C
Explanation:
In an EVPN-VXLAN ERB (Edge Routed Bridging) architecture, Layer 2 VLANs can be stretched across data centers using VXLAN, while Layer 3 communication between different VLANs requires routing at the edge. Since the Blue VLAN must remain the same across DC and DC2, it must be stretched using VXLAN. However, inter-VLAN communication (between the Red and Green VLANs) requires Layer 3 routing, which is typically handled by a services block, such as the SRX Series chassis cluster shown in the diagram.
To enable inter-VLAN communication, a transit VNI (VXLAN Network Identifier) must be introduced, allowing the Red and Green VLANs to communicate across the two data centers. The interconnect between the SRX Series devices ensures that Layer 3 routing can be performed while maintaining VXLAN encapsulation between the two sites.
NEW QUESTION # 40
Exhibit.
Host A is connected to vlan 100 on lead. Host B is connected to vlan 200 on leaf1. Host A and Host B ate unable to communicate. You have reviewed the touting and your hosts have the correct default route (.1) Referring to the exhibit, which two commands will solve the problem? (Choose two.)
- A. set interfaces irb unit 100 family inet address 192-168.100.1
- B. delete vlans vn200 13-interface irb.200
- C. set routing-options static route 0.0.0.0/0 next-hop 192.168.200.10
- D. set vlans vn10013-interface irb.100
Answer: C,D
Explanation:
In the provided network configuration, Host A is in VLAN 100 and Host B is in VLAN 200. The issue arises because these two hosts are unable to communicate, which indicates that either the interfaces are not properly linked to their respective VLANs, or there is a missing static route required for inter-VLAN routing.
Step-by-Step Analysis:
* VLAN Assignment:
* The exhibit shows that irb.200 is correctly associated with VLAN 200 in the configuration.
However, there is no corresponding irb.100 for VLAN 100. Without irb.100, the network lacks the logical interface to handle routing for VLAN 100. Thus, adding irb.100 to VLAN 100 is necessary.
Command to solve this:
set vlans vn100 13-interface irb.100
* Static Route Configuration:
* For inter-VLAN routing to occur, a static route needs to be configured that allows traffic to pass between different subnets (in this case, between VLAN 100 and VLAN 200). The command set routing-options static route 0.0.0.0/0 next-hop 192.168.200.10 would add a static route that directs all traffic from VLAN 100 to the correct gateway (192.168.200.10), which is necessary to route traffic between the two VLANs.
Command to solve this:
set routing-options static route 0.0.0.0/0 next-hop 192.168.200.10
Explanation of Incorrect Options:
* Option A (delete vlans vn200 13-interface irb.200): This would remove the logical interface associated with VLAN 200, which is not desired because we need VLAN 200 to remain active and properly routed.
* Option B (set interfaces irb unit 100 family inet address 192-168.100.1): This command would incorrectly assign an IP address that does not correspond with the subnet of VLAN 100 (192.168.200.1
/24). This could create a misconfiguration, leading to routing issues.
Data Center References:
For a Data Center, proper VLAN management and static routing are crucial for ensuring that different network segments can communicate effectively, especially when dealing with separated subnets or zones like in different VLANs. This aligns with best practices in DCIM (Data Center InfrastructureManagement) which stress the importance of proper network configuration to avoid downtime and ensure seamless communication between all critical IT infrastructure components.
Ensuring that the correct interfaces are associated with the correct VLANs and having the proper static routes in place are both essential steps in maintaining a robust and reliable data center network.
This detailed analysis reflects best practices as noted in standard data center design and network configuration guides.
NEW QUESTION # 41
Exhibit.
You want to enable the border leaf device to send Type 5 routes of local networks to the border leaf device in another data center. What must be changed to the configuration shown in the exhibit to satisfy this requirement?
- A. Add a VLAN configuration with an 13-interface to the tenant1 routing instance.
- B. Add encapsulation vxlan to the evpn hierarchy.
- C. Change: 5001 in the route-distinguisher to : 10010.
- D. Move vrf-target target: 65000:1 to the evpn hierarchy.
Answer: D
Explanation:
In this scenario, you want the border leaf device to advertise Type 5 EVPN routes to another border leaf in a different data center. Type 5 routes in EVPN are used to advertise IP prefixes, which means that for proper route advertisement, you need to configure the correct settings within the evpn hierarchy.
Step-by-Step Analysis:
* Understanding EVPN Type 5 Routes:
* EVPN Type 5 routes are used to advertise IP prefixes across EVPN instances, which allow different data centers or networks to exchange routing information effectively.
* VRF Target Setting:
* The vrf-target configuration is crucial because it defines the export and import policies for the VRF within the EVPN instance. For EVPN Type 5 routes to be advertised to other border leaf devices, the vrf-target needs to be correctly configured under the evpn hierarchy, not just within the routing instance.
Command to solve this:
move vrf-target target:65000:1 to evpn
* Other Options:
* Option B:Adding a VLAN configuration would not address the requirement to advertise Type 5 routes.
* Option C:Adding VXLAN encapsulation may be necessary for other scenarios but does not directly address the Type 5 route advertisement.
* Option D:Changing the route-distinguisher will differentiate routes but does not impact the advertisement of Type 5 routes to other data centers.
By moving the vrf-target to the evpn hierarchy, you enable the proper route advertisement, ensuring that the Type 5 routes for local networks are shared with other data center border leaf devices. This is aligned with best practices for multi-data center EVPN implementations, which emphasize the correct placement of routing policies within the EVPN configuration.
NEW QUESTION # 42
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?
- A. The load-balance policy must be applied to the forwarding table under the routing-options hierarchy.
- B. The load-balance policy must be applied as an export policy to your BGP
- C. The load-balance policy must have a from statement that matches on protocol bgp.
- D. The multipastmultiple -as configuration must be configured for each peer in the BGP spine group.
Answer: D
Explanation:
* 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.
NEW QUESTION # 43
You want to ensure that VXLAN traffic from the xe-0/0/12 interface is being encapsulated by logical vtep.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 interfaces terse vtep.32770 statistics
- C. show interfaces vtep.32770 detail
- D. show interface terse vtep.32770
Answer: C
Explanation:
show interfaces vtep.32770 detail: This command shows detailed counters, including encapsulation and decapsulation statistics, allowing you to confirm that VXLAN traffic is being encapsulated and forwarded through the VTEP interface.
https://www.juniper.net/documentation/us/en/software/junos/cli-
reference/topics/ref/command/show-interfaces-detail.html
NEW QUESTION # 44
What are three actions available for MAC move limiting? (Choose three.)
- A. drop
- B. enable
- C. log
- D. filter
- E. shutdown
Answer: A,C,E
Explanation:
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.
drop: This action drops packets from the MAC address if it violates the move limit, effectively blocking communication from the offending MAC address.
log: This action logs the MAC move event without disrupting traffic, allowing network administrators to monitor and investigate the event.
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.
NEW QUESTION # 45
A local VTEP has two ECMP paths to a remote VTEP
Which two statements are correctwhen load balancing is enabled in this scenario? (Choose two.)
- A. The source port in the UDP header is used to load balance VXLAN traffic.
- B. The destination port in the UDP header is used to load balance VXLAN traffic.
- C. The inner packet fields are used in the hash for load balancing.
- D. The inner packet fields are not used in the hash for load balancing.
Answer: A,C
Explanation:
* 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 MACaddresses, 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 References:
* 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.
NEW QUESTION # 46
Exhibit.
Connections between hosts connected to Leaf-1 and Leaf-2 are not working correctly.
- A. Configure the setswitch-options vtep-source-interface irb.0parameter on Leaf-1.
- B. Configure the set switch-options vrf-target target:65000:l parameteron Leaf-2.
- C. Configure the setswitch-options service-id 1 parameter on Leaf-2.
- D. Referring to the exhibit, which two configuration changes are required to solve the problem? (Choose two.)
- E. Configure the setswitch-options route-distinguisher i92.168.100.50:i parameter on Leaf-1.
Answer: B,C
Explanation:
* Issue Analysis:
* The problem in the exhibit suggests a mismatch in configuration parameters between Leaf-1 and Leaf-2, leading to communication issues between hosts connected to these leaf devices.
* Configuration Mismatches:
* Service-ID:Leaf-1 has service-id 1 configured, while Leaf-2 does not have this parameter. For consistency and proper operation, the service-id should be the same across both leaf devices.
* VRF Target:Leaf-1 is configured with vrf-target target:65000:1, while Leaf-2 is configured with vrf-target target:65000:2. To allow proper VRF import/export between the two leafs, these should match.
* Corrective Actions:
* C. Configure the set switch-options vrf-target target:65000:1 parameter on Leaf-2:This aligns the VRF targets between the two leaf devices, ensuring they can correctly import and export routes.
* E. Configure the set switch-options service-id 1 parameter on Leaf-2:This ensures that both Leaf-1 and Leaf-2 use the same service ID, which is necessary for consistency in the EVPN- VXLAN setup.
Data Center References:
* Correct configuration of VRF targets and service IDs is critical in EVPN-VXLAN setups to ensure that routes and services are correctly shared and recognized between different devices in the network fabric.
NEW QUESTION # 47
You are implementing VXLAN broadcast domains in your data center environment. Which two statements are correct in this scenario? (Choose two.)
- A. The VNI is a 16-bit value and can range from 0 through 16.777.215.
- B. The VNI must match the VLAN tag to ensure that the remote VTEP can decapsulate VXLAN packets.
- C. Layer 2 frames are encapsulated by the source VTEP.
- D. A VXLAN packet does not contain a VLAN ID.
Answer: C,D
Explanation:
* VXLAN Overview:
* VXLAN (Virtual Extensible LAN) is a network virtualization technology that encapsulates Layer
2 Ethernet frames into Layer 3 UDP packets for transmission over an IP network. It allows the creation of Layer 2 overlay networks across a Layer 3 infrastructure.
* Understanding VXLAN Components:
* VTEP (VXLAN Tunnel Endpoint):A VTEP is responsible for encapsulating and decapsulating Ethernet frames into and from VXLAN packets.
* VNI (VXLAN Network Identifier):A 24-bit identifier used to distinguish different VXLAN segments, allowing for up to 16 million unique segments.
* Correct Statements:
* C. Layer 2 frames are encapsulated by the source VTEP:This is correct. In a VXLAN deployment, the source VTEP encapsulates the original Layer 2 Ethernet frame into a VXLAN packet before transmitting it over the IP network to the destination VTEP, which then decapsulates it.
* A. A VXLAN packet does not contain a VLAN ID:This is correct. The VXLAN header does not carry the original VLAN ID; instead, it uses the VNI to identify the network segment. The VLAN ID is local to the switch and does not traverse the VXLAN tunnel.
* Incorrect Statements:
* B. The VNI must match the VLAN tag to ensure that the remote VTEP can decapsulate VXLAN packets:This is incorrect. The VNI is independent of the VLAN tag, and the VLAN ID does not need to match the VNI. The VNI is what the remote VTEP uses to identify the correct VXLAN segment.
* D. The VNI is a 16-bit value and can range from 0 through 16,777,215:This is incorrect because the VNI is a 24-bit value, allowing for a range of 0 to 16,777,215.
Data Center References:
* VXLAN technology is critical for modern data centers as it enables scalability and efficient segmentation without the constraints of traditional VLAN limits.
NEW QUESTION # 48
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 increases when you remove leaf devices.
- C. The oversubscription ratio remains the same when you remove leaf devices.
- D. The oversubscription ratio remains the same when you add leaf devices.
Answer: B,D
Explanation:
* 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.
NEW QUESTION # 49
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?
- A. set protocols bgp group PROVIDER export LOOPBACKS
- B. set protocols bgp group overlay export loopbacks
- C. delete protocols bgp group UNDERLAY advertise-external
- D. delete protocols bgp group OVERLAY accept-remote-nexthop
Answer: D
Explanation:
* 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:
* D. delete 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 References:
* 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.
NEW QUESTION # 50
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