2024年最新のJN0-683問題集を試そう！更新されたJuniper試験合格させます
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Juniper JN0-683 認定試験の出題範囲：
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質問 # 11
Exhibit.
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 the VXLAN gateways will be placed?
(Choose three.)
- A. Spine devices will have no VXLAN gateways.
- B. Only the border and leaf devices will have L3 VXLAN gateways.
- C. Only the spine devices will have L2 VXLAN gateways.
- D. All leaf devices will have L3 VXLAN gateways.
- E. All leaf devices will have L2 VXLAN gateways.
正解：A、D、E
解説：
* Understanding ERB Architecture:
* ERB (Edge Routed Bridging) architecture is a network design where the routing occurs at the edge (leaf devices) rather than in the spine devices. In a VXLAN overlay network with EVPN as the control plane, leaf devices typically act as both Layer 2 (L2) and Layer 3 (L3) VXLAN gateways.
* Placement of VXLAN Gateways:
* Option B:All leaf devices will have L2 VXLAN gateways to handle the bridging of VLAN traffic into VXLAN tunnels.
* Option C:All leaf devices will also have L3 VXLAN gateways to route traffic between different VXLAN segments (VNIs) and external networks.
* Option E:Spine devices in an ERB architecture generally do not function as VXLAN gateways.
They primarily focus on forwarding traffic between leaf nodes and do not handle VXLAN encapsulation/decapsulation.
Conclusion:
* Option B:Correct-All leaf devices will have L2 VXLAN gateways.
* Option C:Correct-All leaf devices will have L3 VXLAN gateways.
* Option E:Correct-Spine devices will not act as VXLAN gateways
質問 # 12
Exhibit.
The exhibit shows the truncated output of the show evpn database command.
Given this output, which two statements are correct about the host with MAC address 40:00:dc:01:00:04?
(Choose two.)
- A. The host is originating from an ESI LAG.
- B. The host is assigned IP address 10.4.4.5.
- C. The host is located on VN110002.
- D. The host is originating from irb.300.
正解：A、B
解説：
* Understanding the Output:
* The show evpn database command output shows the MAC address, VLAN, active source, timestamp, and IP address associated with various hosts in the EVPN instance.
* Analysis of the MAC Address:
* Option A:The MAC address 40:00:dc:01:00:04 is associated with the IP address 10.4.4.5, as indicated by the output in the IP address column. This confirms that this host has been assigned the IP 10.4.4.5.
* Option D:The active source for the MAC address 40:00:dc:01:00:04 is listed as 00:02:00:00:00:
04:00:04:00:00:04:00:04, which indicates that the host is connected via an ESI (Ethernet Segment Identifier) LAG (Link Aggregation Group). This setup is typicallyused in multi-homing scenarios to provide redundancy and load balancing across multiple physical links.
Conclusion:
* Option A:Correct-The host with MAC 40:00:dc:01:00:04 is assigned IP 10.4.4.5.
* Option D:Correct-The host is originating from an ESI LAG, as indicated by the active source value.
質問 # 13
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. IP VPN
- B. EVPN Type 2 stretch
- C. Type 2 seamless stitching
- D. over the top full-mesh interconnect
正解：C
解説：
* 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.
質問 # 14
What are three actions available tor MAC move limiting? (Choose three.)
- A. enable
- B. shutdown
- C. log
- D. filter
- E. drop
正解：B、C、E
解説：
* 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.
質問 # 15
Exhibit.
Given the configuration shown in the exhibit, why has the next hop remained the same for the EVPN routes advertised to the peer 203.0.113.2?
- A. The vrf-export parameter must be applied.
- B. The export policy is incorrectly configured.
- C. EVPN routes cannot have the next hop changed.
- D. The vpn-apply-export parameter must be applied to this peer.
正解：D
解説：
* Understanding the Configuration:
* The configuration shown in the exhibit involves an EVPN (Ethernet VPN) setup using BGP as the routing protocol. The export policy named CHANGE_NH is applied to the BGP group evpn- peer, which includes a rule to change the next hop for routes that match the policy.
* Issue with Next Hop Not Changing:
* The policy CHANGE_NH is correctly configured to change the next hop to 203.0.113.10 for the matching routes. However, the next hop remains unchanged when advertising EVPN routes to the peer 203.0.113.2.
* Reason for the Issue:
* In Junos OS, when exporting routes for VPNs (including EVPN), the next-hop change defined in a policy will not take effect unless the vpn-apply-export parameter is used inthe BGP configuration. This parameter ensures that the export policy is applied specifically to VPN routes.
* The vpn-apply-export parameter must be included to apply the next-hop change to EVPN routes.
* Correct Answer Explanation:
* D. The vpn-apply-export parameter must be applied to this peer:This is the correct solution because the next hop in EVPN routes won't be altered without this parameter in the BGP configuration. It instructs the BGP process to apply the export policy to the EVPN routes.
Data Center References:
* This behavior is standard in EVPN deployments with Juniper Networks devices, where the export policies applied to VPN routes require explicit invocation using vpn-apply-export to take effect.
質問 # 16
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 setswitch-options route-distinguisher 192.168.100.51:2 parameter on Leaf-1.
- B. Configure the set switch-options vrf-target target: 65000:55 parameter on Leaf-2.
- C. Configure the setswitch-options vtep-source-interface100. 0 parameter on Leaf-1.
- D. Configure the set switch-options service-id 1 parameter on Leaf-2.
正解：B、D
解説：
* 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.
質問 # 17
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 as an export policy to your BGP
- B. The load-balance policy must be applied to the forwarding table under the routing-options hierarchy.
- 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.
正解：D
解説：
* 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.
質問 # 18
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 routing-options static route 0.0.0.0/0 next-hop 192.168.200.10
- B. set vlans vn10013-interface irb.100
- C. delete vlans vn200 13-interface irb.200
- D. set interfaces irb unit 100 family inet address 192-168.100.1
正解：A、B
解説：
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.
質問 # 19
Exhibit.
Both DC and DC2 ate 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 in this scenario?
- A. 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
- B. 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.
- 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. 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.
正解：C
解説：
* ERB Architecture in EVPN-VXLAN:
* ERB (Edge Routed Bridging) architecture is commonly used in data center networks where routing decisions are made at the network edge (leaf or border devices), while bridging (Layer 2 forwarding) is extended across the fabric. This architecture allows for efficient L3 routing while still enabling L2 services like VLANs to span across multiple locations.
* VLAN and VNI Configuration:
* The scenario specifies that a server on the Red VLAN needs to communicate with a server on the Green VLAN. Since these VLANs are in different data centers (DC and DC2), and given the use of EVPN-VXLAN, the communication between these VLANs will require atransit VNI(Virtual Network Identifier). This transit VNI will allow traffic to traverse the VXLAN tunnel across the DCI (Data Center Interconnect).
* Interconnect between SRX Series Devices:
* The exhibit shows SRX Series Chassis Clusters used as service devices (likely for firewalling or other security services). These devices need to be interconnected between the two data centers to ensure that VLANs can communicate effectively. The Blue VLAN needs to be stretched between DC and DC2 to maintain the same Layer 2 domain across both data centers.
Conclusion:
* Option B:Correct-Interconnecting the SRX Series devices will ensure the necessary service chaining, while stretching the Blue VLAN and adding a transit VNI for the Red and Green VLANs will enable the required communication across the data centers.
質問 # 20
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 interfaces vtep.32770 detail
- C. show interfaces terse vtep.32770 statistics
- D. show interface terse vtep.32770
正解：C
解説：
* 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.
質問 # 21
You want to convert an MX Series router from a VXLAN Layer 2 gateway to a VXLAN Layer 3 gateway for VNI 100. You have already configured an IRB interface. In this scenario, which command would you use to accomplish this task?
- A. set protocols ospf area 0.0.0.0 interface irb.100 passive
- B. set protocols isis interface irb.100 passive
- C. set vlans VLAN-100 13-interface irb.100
- D. set bridge-domains VLAN-100 routing-interface irb.100
正解：D
解説：
* Scenario Overview:
* Converting an MX Series router from a VXLAN Layer 2 gateway to a VXLAN Layer 3 gateway involves transitioning the router's functionality from simply bridging traffic within a VXLAN segment to routing traffic between different segments.
* Key Configuration Requirement:
* IRB (Integrated Routing and Bridging) Interface:An IRB interface allows for both Layer 2 switching and Layer 3 routing. To enable routing for a specific VNI (VXLAN Network Identifier), the IRB interface must be associated with the routing function in the corresponding bridge domain.
* Correct Command:
* C. set bridge-domains VLAN-100 routing-interface irb.100:This command correctly binds the IRB interface to the bridge domain, enabling Layer 3 routing functionality within the VXLAN for VNI 100. This effectively transitions the device from operating solely as a Layer 2 gateway to a Layer 3 gateway.
Data Center References:
* This configuration step is essential when converting a Layer 2 VXLAN gateway to a Layer 3 gateway, enabling the MX Series router to route between VXLAN segments.
質問 # 22
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 file server that stores software image and configuration files.
- B. You must have an NTP server to perform time synchronization.
- C. You must have a system log (syslog) server to manage system log messages and alerts.
- D. You must have a DHCP server that provides the location of the software image and configuration files.
正解：A、D
解説：
* 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.
質問 # 23
Exhibit.
Referring to the exhibit, when Host A sends an ARP request for Host B's IP address, which Junos feature does leaf1require to send an ARP response back to Host A without having to send a broadcast frame over the fabric?
- A. GARP
- B. proxy NDP
- C. DAD
- D. proxy ARP
正解：D
解説：
* Scenario Overview:
* In the exhibit, Host A is trying to resolve Host B's IP address (10.10.1.2) through ARP (Address Resolution Protocol). Normally, an ARP request would be broadcasted over the network, and the host owning the IP address (Host B) would respond.
* Role of Proxy ARP:
* Option A:Proxy ARPallows a router or switch (in this case, leaf1) to respond to ARP requests on behalf of another host. Leaf1, knowing the MAC address of Host B through the EVPN MAC advertisement, can reply to Host A's ARP request directly without broadcasting the request across the entire network fabric. This feature reduces unnecessary traffic and increases network efficiency.
Conclusion:
* Option A:Correct-Proxy ARP enables leaf1 to respond to Host A's ARP request for Host B's IP without broadcasting over the IP fabric, thus providing the ARP response locally.
質問 # 24
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. delete protocols bgp group UNDERLAY advertise-external
- B. set protocols bgp group PROVIDER export LOOPBACKS
- C. delete protocols bgp group OVERLAY accept-remote-nexthop
- D. set protocols bgp group overlay export loopbacks
正解：C
解説：
* 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.
質問 # 25
Which two statements are true about a pure IP fabric? (Choose two.)
- A. Devices in an IP fabric must be connected to a fabric controller.
- B. An IP fabric supports Layer 2 VLANs.
- C. Devices in an IP fabric function as Layer 3 routers.
- D. An IP fabric does not support Layer 2 protocols.
正解：C、D
解説：
* Understanding Pure IP Fabric:
* A pure IP fabric is a network design where all devices operate at Layer 3, meaning that each device in the fabric is a router that makes forwarding decisions based on IP addresses.
* Layer 2 Support:
* In a pure IP fabric, traditional Layer 2 protocols such as Spanning Tree Protocol (STP) or VLANs are not supported. Instead, the network relies entirely on Layer 3 routing protocols to manage traffic between devices.
* Routing Functionality:
* Since devices in an IP fabric operate as Layer 3 routers, they handle IP routing and provide network services based on IP addresses, not on MAC addresses or Layer 2 switching.
Conclusion:
* Option A:Correct-Devices in an IP fabric function as Layer 3 routers.
* Option D:Correct-A pure IP fabric does not support traditional Layer 2 protocols, making it a purely routed environment.
質問 # 26
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. An IRB interface must be configured on spinel and spine2.
- C. Traffic from server1 to server2 will transit a VXLAN tunnel to spinel or spine2. then a VXLAN tunnel from spinel or spine2 to Ieaf2.
- D. Traffic from server! to server2 will transit the VXLAN tunnel between leaf1 and Ieaf2.
正解：A、D
解説：
* Understanding the Exhibit Setup:
* The network diagram shows an EVPN-VXLAN setup, a common design for modern data centers enabling Layer 2 and Layer 3 services over an IP fabric.
* Leaf1 and Leaf2 are the leaf switches connected to Server1 and Server2, respectively, with each server in a different subnet (172.16.1.0/24 and 172.16.2.0/24).
* Spine1 and Spine2 are part of the IP fabric, interconnecting the leaf switches.
* EVPN-VXLAN Basics:
* EVPN (Ethernet VPN) provides Layer 2 and Layer 3 VPN services using MP-BGP.
* VXLAN (Virtual Extensible LAN) encapsulates Layer 2 frames into Layer 3 packets for transmission across an IP network.
* VTEP (VXLAN Tunnel Endpoint) interfaces on leaf devices handle VXLAN encapsulation and decapsulation.
* Integrated Routing and Bridging (IRB):
* IRB interfaces are required on leaf1 and leaf2 (where the endpoints are directly connected) to route between different subnets (in this case, between 172.16.1.0/24 and 172.16.2.0/24).
* The IRB interfaces provide the necessary L3 gateway functions for inter-subnet communication.
* Traffic Flow Analysis:
* Traffic from Server1 (172.16.1.1) destined for Server2 (172.16.2.1) must traverse from leaf1 to leaf2.
* The traffic will be VXLAN encapsulated on leaf1, sent over the IP fabric, and decapsulated on leaf2.
* Since the communication is between different subnets, the IRB interfaces on leaf1 and leaf2 are crucial for routing the traffic correctly.
* Correct Statements:
* C. An IRB Interface must be configured on leaf1 and leaf2:This is necessary to perform the inter-subnet routing for traffic between Server1 and Server2.
* D. Traffic from server1 to server2 will transit the VXLAN tunnel between leaf1 and leaf2:
This describes the correct VXLAN operation where the traffic is encapsulated by leaf1 and decapsulated by leaf2.
Data Center References:
* In EVPN-VXLAN architectures, the leaf switches often handle both Layer 2 switching and Layer 3 routing via IRB interfaces. This allows for efficient routing within the data center fabric without the need to involve the spine switches for every routing decision.
* The described traffic flow aligns with standard EVPN-VXLAN designs, where direct VXLAN tunnels between leaf switches enable seamless and scalable communication across a data center network.
質問 # 27
You want to provide a OCI that keeps each data center routing domain isolated, while also supporting translation of VNIs. Which DCI scheme allows these features?
- A. over the top (OTT) with proxy gateways
- B. MPLS DCI label exchange
- C. VXLAN stitching
- D. over the top (OTT) with VNI translation enabled
正解：C
解説：
* Understanding DCI (Data Center Interconnect) Schemes:
* DCI schemes are used to connect multiple data centers, enabling seamless communication and resource sharing between them. The choice of DCI depends on the specific requirements, such as isolation, VNI translation, or routing domain separation.
* VXLAN Stitching:
* VXLAN stitching involves connecting multiple VXLAN segments, allowing VNIs (VXLAN Network Identifiers) from different segments to communicate with each other while maintaining separate routing domains.
* This approach is particularly effective for keeping routing domains isolated while supporting VNI translation, making it ideal for scenarios where you need to connect different data centers or networks without merging their control planes.
* Other Options:
* A. MPLS DCI label exchange:This option typically focuses on MPLS-based interconnections and does not inherently support VNI translation or isolation in the context of VXLAN.
* B. Over the top (OTT) with VNI translation enabled:This could support VNI translation but does not inherently ensure routing domain isolation.
* D. Over the top (OTT) with proxy gateways:This typically involves using external gateways for traffic routing and may not directly support VNI translation or isolation in the same way as VXLAN stitching.
Data Center References:
* VXLAN stitching is a powerful method in multi-data center environments, allowing for flexibility in connecting various VXLAN segments while preserving network isolation and supporting complex interconnect requirements.
質問 # 28
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合格できるJuniper JN0-683のPDF問題集で最近更新された67問あります：https://drive.google.com/open?id=1zisanXpdTbR5MzOf1BeoEzeYfjMJ4sUN