The Most In-Demand Juniper JN0-683 Pass Guaranteed Quiz
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NEW QUESTION # 36
You manage an IP fabric with an EVPN-VXLAN overlay. You have multiple tenants separated using multiple unique VRF instances. You want to determine the routing information that belongs in each routing instance's routing table.
In this scenario, which property is used for this purpose?
- A. the route distinguisher value
- B. the VRF target community
- C. the routing instance type
- D. the VRF table label
Answer: A
Explanation:
* Understanding VRF and Routing Instances:
* In an EVPN-VXLAN overlay network, multiple tenants are separated using unique VRF (Virtual Routing and Forwarding) instances. Each VRF instance maintains its own routing table, allowing for isolated routing domains within the same network infrastructure.
* Role of Route Distinguisher:
* Route Distinguisher (RD):The RD is a unique identifier used in MPLS and EVPN environments to distinguish routes belonging to different VRFs. The RD is prepended to the IP address in the route advertisement, ensuring that routes from different tenants remain unique even if they use the same IP address range.
* Correct Property:
* D. the route distinguisher value:This is the correct answer because the RD is crucial in determining which routing information belongs to which VRF instance. It ensures that each VRF' s routing table only contains relevant routes, maintaining isolation between tenants.
Data Center References:
* The RD is a key element in MPLS and EVPN-based multi-tenant environments, ensuring proper routing segregation and isolation for different VRFs within the data center fabric.
NEW QUESTION # 37
You are adding a server lo a tenant's network within your data center and must limit access to a specific traffic type within the tenant network without pushing all tenant traffic through a firewall.
What will satisfy this requirement?
- A. Use route leaking with EVPN and a routing policy.
- B. Use filter-based forwarding.
- C. Put the new server on a unique subnet within the tenant's network.
- D. Use a static route in the tenant VRF with a firewall as the next hop for traffic to the new server.
Answer: B
Explanation:
* Controlling Traffic Within a Tenant's Network:
* The requirement is to limit access to specific traffic types within a tenant's network without routing all tenant traffic through a firewall. This requires a selective method that can direct specific types of traffic to different paths based on the nature of the traffic.
* Filter-Based Forwarding (FBF):
* FBF is a technique that allows for routing decisions based on filters applied to the traffic, such as matching on source IP addresses, destination IP addresses, or even specific application types (like HTTP or FTP). This allows specific types of traffic to be forwardedto a specific next hop (e.g., a firewall) without affecting the entire traffic flow within the tenant's network.
Conclusion:
* Option B:Correct-Filter-based forwarding allows for granular control of traffic, ensuring that only specific types of traffic within the tenant's network are redirected through a firewall, satisfying the requirement.
NEW QUESTION # 38
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 add spine devices.
- B. The oversubscription ratio increases when you remove spine devices.
- C. The oversubscription ratio decreases when you add spine devices.
- D. The oversubscription ratio remains the same when you remove spine devices.
Answer: B,C
Explanation:
The oversubscription ratio is the ratio of edge (leaf) bandwidth to core (spine) bandwidth.
When you add spine devices, the total available core bandwidth increases, which reduces (decreases) the oversubscription ratio.
When you remove spine devices, the total core bandwidth decreases while edge bandwidth remains the same, causing the oversubscription ratio to increase.
NEW QUESTION # 39
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. Move vrf-target target: 65000:1 to the evpn hierarchy.
- B. Add a VLAN configuration with an 13-interface to the tenant1 routing instance.
- C. Add encapsulation vxlan to the evpn hierarchy.
- D. Change: 5001 in the route-distinguisher to : 10010.
Answer: A
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 # 40
Which three statements are correct about symmetric IRB routing with EVPN Type 2 routes?
(Choose three.)
- A. Symmetric routing requires an extra transit VNI for each VRF.
- B. Symmetric routing requires MAC-VRF.
- C. Symmetric routing is less efficient than asymmetric routing.
- D. An L3 interface (IRB) is required for each local VLAN.
- E. Symmetric routing supports the EVPN service VLAN bundle.
Answer: A,B,D
Explanation:
An L3 interface (IRB) is required for each local VLAN: In symmetric IRB (Integrated Routing and Bridging) routing with EVPN Type 2 routes, an L3 interface (IRB) is needed for each VLAN in the local network. This interface provides the Layer 3 connectivity for the local VLANs and allows routing between bridged domains.
Symmetric routing requires MAC-VRF: Symmetric routing typically requires the use of MAC- VRF (MAC address VPN), which enables the device to route traffic while maintaining both Layer
2 and Layer 3 information. This ensures that both bridged and routed traffic are handled efficiently.
Symmetric routing requires an extra transit VNI for each VRF: It requires an extra transit VNI (a Layer 3 VNI) per VRF that carries routed (Layer 3) traffic across the VXLAN fabric.
NEW QUESTION # 41
Which two statements are true about IP fabrics using unnumbered BGP? (Choose two.)
- A. Unnumbered BGP peering automatically provisions IPv4 peering.
- B. Unnumbered BGP requires that family inet is configured on each interface.
- C. Unnumbered BGP peering automatically provisions IPv6 peering.
- D. Unnumbered BGP requires that family inet6 is configured on each interface.
Answer: C,D
Explanation:
BGP unnumbered peering uses only link-local IPv6 addresses on interfaces to automatically discover and establish BGP peer sessions. No routable IP addresses are required on the underlay interfaces.
You must configure the interfaces with family inet6 to enable the link-local IPv6 addresses used for peering.
The BGP peering session is dynamically created based on interface names, which simplifies the configuration significantly compared to manual peering with routable IP addresses.
The peer IP and remote AS numbers are automatically configured for BGP unnumbered peering.
This means unnumbered BGP automatically provisions IPv6 peering using the link-local addresses.
It also supports IPv4 route exchange over the IPv6 next-hop established by unnumbered BGP.
https://www.juniper.net/documentation/us/en/software/nce/nce-225-bgp-unnumbered/index.html
NEW QUESTION # 42
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 set switch-options vtep-source-interface 100. 0 parameter on Leaf-1.
- C. Configure the set switch-options service-id 1 parameter on Leaf-2.
- D. Configure the set switch-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 # 43
Exhibit.
You have a sample configuration for connecting two sites through EVPN-VXLAN by exchanging IP prefix routes.
Referring to the exhibit, which two statements regarding the configuration are true? {Choose two.)
- A. The advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 2 route.
- B. The VNI should be unique on all devices for each customer site.
- C. The VNI must match on all devices for the same customer.
- D. The advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 5 route.
Answer: C,D
Explanation:
EVPN-VXLAN Configuration:
* The configuration provided in the exhibit shows an EVPN-VXLAN setup where IP prefix routes are exchanged between two sites. The advertise direct-nexthop option and the VNI (Virtual Network Identifier) settings are crucial in this context.
Advertise Direct-Nexthop:
* Option A:The advertise direct-nexthop option ensures that the next-hop route is resolved using only the information carried in the EVPN Type 5 route. Type 5 routes are used for IP prefix advertisement in EVPN, which is key to enabling Layer 3 interconnectivity between different VXLAN segments.
VNI Consistency:
* Option C:For the same customer across different devices, the VNI must be consistent. This consistency ensures that all devices can correctly map traffic to the appropriate VXLAN segment, maintaining seamless Layer 2 and Layer 3 connectivity.
NEW QUESTION # 44
You are asked to build out the VXLAN control plane.
In this scenario, which two protocols provide this capability? (Choose two.)
- A. PIM-SM
- B. MBGP
- C. OSPF
- D. IS-IS
Answer: A,B
Explanation:
MBGP (Multicast BGP): MBGP is used to advertise VXLAN information across the control plane, specifically for multicast-based VXLAN deployment. It helps in distributing VXLAN Network Identifiers (VNIs) and other relevant information in an efficient manner across the network.
PIM-SM (Protocol Independent Multicast - Sparse Mode): PIM-SM is used to build multicast distribution trees in VXLAN flood-and-learn mode or when multicast-based VXLAN control planes are used.
NEW QUESTION # 45
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. EVPN routes cannot have the next hop changed.
- B. The export policy is incorrectly configured.
- C. The vrf-export parameter must be applied.
- D. The vpn-apply-export parameter must be applied to this peer.
Answer: D
Explanation:
* 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.
NEW QUESTION # 46
Your company asks you to create a network in one of its data centers specifically for supporting AI or ML workloads. You have chosen to use lossless Ethernet.
In this scenario, which statement about Juniper Networks' best practices for Ethernet networks that support RDMA AI/ML traffic is correct?
- A. Disable LLDP on interfaces that use DCBX
- B. Enable ETS on the GPU facing interfaces.
- C. Modify the load balancing default hashing.
- D. Assign all shared buffers to the lossless queues.
Answer: B
Explanation:
In a lossless Ethernet network designed for AI/ML workloads using RDMA (Remote Direct Memory Access), Enhanced Transmission Selection (ETS) is a key feature that helps allocate bandwidth dynamically among different traffic classes, ensuring that AI/ML traffic is prioritized without starving other types of traffic. Juniper Networks' best practices recommend enabling ETS on interfaces connecting to GPU servers to ensure proper bandwidth allocation and prevent congestion.
NEW QUESTION # 47
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 four leaf devices in the services blocks; the Red VLAN and the Green VLAN must be stitched and the Blue VLAN must be stretched.
- D. 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.
Answer: D
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 # 48
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 MAC address of the FTP server
- B. the MAC address for each OFX5120
- C. the IP address of the FTP server
- D. the management IP address for each OFX5120
Answer: B,D
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.
NEW QUESTION # 49
An IP fabric with EBGP configured in the overlay uses a different AS number for each node in the fabric.
Which two benefits does this configuration have over using a single AS scheme? (Choose two.)
- A. There are fewer BGP peers.
- B. It provides more efficient BGP path selection.
- C. There is more TCAM space for AS numbers.
- D. It avoids the use of route reflectors.
Answer: B,D
Explanation:
Using a different AS number for each node in an EBGP overlay eliminates the need for route reflectors since EBGP inherently prefers routes learned from external ASes over internal routes, ensuring efficient route propagation without additional configuration. This setup also enhances BGP path selection by leveraging AS_PATH attributes to prevent routing loops and ensure optimal traffic flow across the fabric.
NEW QUESTION # 50
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 isis interface irb.100 passive
- B. set bridge-domains VLAN-100 routing-interface irb.100
- C. set vlans VLAN-100 13-interface irb.100
- D. set protocols ospf area 0.0.0.0 interface irb.100 passive
Answer: B
NEW QUESTION # 51
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 isis interface irb.100 passive
- B. set bridge-domains VLAN-100 routing-interface irb.100
- C. set vlans VLAN-100 13-interface irb.100
- D. set protocols ospf area 0.0.0.0 interface irb.100 passive
Answer: B
Explanation:
To convert the VXLAN Layer 2 gateway to a VXLAN Layer 3 gateway for VNI 100, you need to assign the IRB interface (which is configured for Layer 3 routing) to the relevant bridge domain.
This is accomplished with the command set bridge-domains VLAN-100 routing-interface irb.100.
This command links the IRB interface (irb.100) to the bridge domain (VLAN-100) and enables Layer 3 routing for that VNI.
NEW QUESTION # 52
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.
Answer: B,D
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 # 53
You are asked to interconnect two of your company's data centers across the IP backbone. Both data centers have their own unique IP space and do not require any bridging.
In this scenario, which two actions would accomplish this task? (Choose two.)
- A. Configure peering for EVPN between all leaf nodes within each data center.
- B. Configure peering for EVPN between border leaf nodes in each data center.
- C. Configure a Type 5 EVPN route for each unique prefix.
- D. Configure a Type 2 EVPN route for each unique prefix.
Answer: B,C
Explanation:
Configure peering for EVPN between border leaf nodes in each data center: In order to interconnect the data centers across the IP backbone, you would configure EVPN peering between the border leaf nodes in each data center. Border leaf nodes act as the gateway between the local data center and the external network (in this case, the inter-data-center IP backbone). This ensures that the data centers can communicate and exchange routing information.
Configure a Type 5 EVPN route for each unique prefix: Type 5 EVPN routes are used for inter-subnet communication (i.e., for advertising IP prefixes between data centers). Since the data centers have unique IP address spaces and do not require bridging, Type 5 routes are appropriate for advertising these unique prefixes across the data centers.
NEW QUESTION # 54
You are asked to identify microburst traffic occurring in the network leading to packet drops in your data center switches.
Which two tools would be used in this scenario? (Choose two.)
- A. Traceoptions
- B. syslog
- C. port mirroring
- D. port buffer monitoring
Answer: C,D
Explanation:
port buffer monitoring: Port buffer monitoring is an effective tool for detecting microbursts in network traffic. By monitoring buffer utilization on the switch ports, you can identify periods of high congestion where the buffer might overflow, leading to packet drops. This allows you to observe when and where traffic is overwhelming the port buffers, which is a typical sign of microbursts.
port mirroring: Port mirroring allows you to capture the traffic on a specific port or set of ports and send it to a monitoring device for analysis. This can be useful for identifying microburst traffic, as it allows you to analyze the traffic patterns and volume to determine if short bursts of traffic are causing packet drops on the network.
NEW QUESTION # 55
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 L3 VXLAN gateways.
- B. Only the spine devices will have L2 VXLAN gateways.
- C. All leaf devices will have L2 VXLAN gateways.
- D. Spine devices will have no VXLAN gateways.
- E. Only the border and leaf devices will have L3 VXLAN gateways.
Answer: C,D,E
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 # 56
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Juniper JN0-683 Exam Syllabus Topics:
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