Latest Juniper JN0-683 First Attempt, Exam real Dumps Updated [Nov-2025]
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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 one peering session to every spine node.
- B. Every leaf node has a peering session to every other leaf node.
- C. EBGP peering does not require an IGP protocol tor adjacency establishment.
- D. EBGP peering requires an IGP protocol tor adjacency establishment.
Answer: A,C
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
Your organization is implementing EVPN-VXLAN and requires multiple overlapping VLAN-IDs. You decide to use a routing-instance type mac-vrf to satisfy this request.
Which two statements are correct in this scenario? (Choose two.)
- A. Host-facing interfaces must be configured using enterprise-style configuration.
- B. Host-facing interfaces must be configured using a service-provider style configuration.
- C. The routing-instance service type can be VLAN-based.
- D. Spine-facing interfaces must be configured using an enterprise-styleconfiguration.
Answer: B,C
Explanation:
* Understanding the Scenario:
* EVPN-VXLAN deployments often involve scenarios where multiple tenants or applications require overlapping VLAN IDs, which can be managed using the mac-vrf routing instance type.
This allows you to segregate traffic within the same VLAN ID across different tenants.
* Host-facing Interface Configuration:
* A. Host-facing interfaces must be configured using a service-provider style configuration:
This is correct. In mac-vrf configurations, host-facing interfaces (those connecting end devices) typically follow a service-provider style configuration, where each customer or tenant's traffic is isolated even if overlapping VLAN IDs are used.
* B. Host-facing interfaces must be configured using enterprise-style configuration:This is incorrect for mac-vrf instances because enterprise-style configurations are more common in simpler, less segmented networks.
* Routing Instance Service Type:
* D. The routing-instance service type can be VLAN-based:This is correct. The service type in mac-vrf can indeed be VLAN-based, which is particularly useful in scenarios where VLAN ID overlap is needed between different tenants or services.
Data Center References:
* The mac-vrf instance type is powerful for handling complex multi-tenant environments in EVPN- VXLAN, especially when dealing with overlapping VLAN IDs across different segments of the network.
NEW QUESTION # 39
You are deploying an IP fabric using EBGP and notice that your leaf devices areadvertising and receiving all the routes. However, the routes are not installed in the routing table and are marked as hidden.
Which two statements describe how to solve the issue? (Choose two.)
- A. You need to configure multipath multiple-as.
- B. You need to configure loops 2.
- C. You need to configure a next-hop self policy.
- D. You need to configure as-override.
Answer: A,C
NEW QUESTION # 40
Exhibit.
Referring to the exhibit, why is the active source field blank for the entry that uses the 00:0c:29:e8:b7:39 MAC address?
- A. The ARP lookup for this host has failed.
- B. The EVPN route for this host does not have a valid next hop.
- C. The host for this entry is locally connected to leaf1.
- D. This entry is associated with a multicast EVPN route.
Answer: C
NEW QUESTION # 41
Exhibit.
Connections between hosts connected to Leaf-1 and Leaf-2 are not working correctly.
- A. Referring to the exhibit, which two configuration changes are required to solve the problem? (Choose two.)
- B. Configure the set switch-options service-id 1 parameter on Leaf-2.
- C. Configure the set switch-options vtep-source-interface irb.0 parameter on Leaf-1.
- D. Configure the set switch-options vrf-target target:65000:1parameteron Leaf-2.
- E. Configure the set switch-options route-distinguisher i92.168.100.50:1parameter on Leaf-1.
Answer: D,E
NEW QUESTION # 42
Exhibit.
Referring to the exhibit, the spinel device has an underlay BGP group that is configured to peer with its neighbors' directly connected interfaces. Which two statements are true in this scenario? (Choose two.)
- A. The multihop statement is not required to establish the underlay BGP sessions.
- B. Load balancing for the underlay is configured correctly.
- C. Load balancing for the underlay is not configured correctly.
- D. The multihop statement is required to establish the underlay BGP sessions.
Answer: A,B
Explanation:
* Understanding BGP Configuration in the Exhibit:
* The exhibit shows a BGP configuration on spine1 with a group named underlay, configured to peer with directly connected interfaces of other devices in the network.
* Multipath multiple-as:This statement allows the router to install multiple paths in the routing table for routes learned from different ASes, facilitating load balancing.
* Key Statements:
* A. The multihop statement is not required to establish the underlay BGP sessions:In this case, the BGP peers are directly connected (as indicated by their neighbor IP addresses), so the multihop statement is unnecessary. Multihop is typically used when BGP peers are not directly connected and packets need to traverse multiple hops.
* D. Load balancing for the underlay is configured correctly:The multipath { multiple-as; } statement in the configuration enables load balancing across multiple paths from different autonomous systems, which is appropriate for underlay networks in data center fabrics.
* Incorrect Statements:
* C. The multihop statement is required to establish the underlay BGP sessions:This is incorrect because the peers are directly connected, making the multihop statement unnecessary.
* B. Load balancing for the underlay is not configured correctly:This is incorrect because the configuration includes the necessary multipath settings for load balancing.
Data Center References:
* BGP configurations in EVPN-VXLAN underlay networks are crucial for ensuring redundancy, load balancing, and efficient route propagation across the data center fabric.
NEW QUESTION # 43
Exhibit.
Referring to the exhibit, the spinel device has an underlay BGP group that is configured to peer with its neighbors' directly connected interfaces. Which two statements are true in this scenario? (Choose two.)
- A. The multihop statement is required to establish the underlay BGP sessions.
- B. Load balancing for the underlay is configured correctly.
- C. Load balancing for the underlay is not configured correctly.
- D. The multihop statement is not required to establish the underlay BGP sessions.
Answer: A,B
NEW QUESTION # 44
Which parameter is used to associate a received route with a local VPN route table?
- A. VLAN ID
- B. route-distinguisher
- C. route-target community
- D. VNI
Answer: C
Explanation:
* Understanding VPN Route Table Association:
* In MPLS/VPN and EVPN networks, theroute-target communityis a BGP extended community attribute used to control the import and export of VPN routes. It associates received routes with the appropriate VPN route tables on the PE (Provider Edge) routers.
* Function of Route-Target Community:
* The route-target community tag ensures that routes are imported into the correct VRF (Virtual Routing and Forwarding) instance, allowing them to be correctly routed within the VPN.
Conclusion:
* Option A:Correct-The route-target community is used to associate received routes with a local VPN route table.
NEW QUESTION # 45
Exhibit.
Connections between hosts connected to Leaf-1 and Leaf-2 are not working correctly.
- A. Referring to the exhibit, which two configuration changes are required to solve the problem? (Choose two.)
- 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. Configure the setswitch-options route-distinguisher i92.168.100.50:i parameter on Leaf-1.
- E. Configure the setswitch-options vtep-source-interface irb.0parameter 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 # 46
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 vpn-apply-export parameter must be applied to this peer.
- B. EVPN routes cannot have the next hop changed.
- C. The export policy is incorrectly configured.
- D. The vrf-export parameter must be applied.
Answer: A
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 # 47
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. Advertise Type 5 EVPN routes across the DCI.
- B. Advertise Type 2 EVPN routes across the DCI.
- C. Ensure there is a full mesh of VTEPs between all leaf nodes within data centers.
- D. Ensure border leaf nodes in each data center can exchange EVPN routes.
- E. Ensure there is a full mesh of VTEPs between all spine nodes within both data centers.
Answer: A,B,D
Explanation:
* Layer 2 and Layer 3 Connectivity Requirements:
* To interconnect two data centers across an IP backbone with both Layer 2 (L2) and Layer 3 (L3) connectivity, EVPN-VXLAN (Ethernet VPN with Virtual Extensible LAN) is the ideal solution.
EVPN supports L2 VPNs while also enabling L3 connectivity across multiple locations.
* Necessary EVPN Route Types:
* Type 2 EVPN Routes:These routes are used to advertise MAC addresses for Layer 2 connectivity. They are essential for enabling seamless L2 communication across data centers.
* Type 5 EVPN Routes:These routes are necessary for advertising IP prefixes for Layer 3 connectivity between data centers. They enable the exchange of L3 information across the IP backbone, ensuring routed traffic can reach its destination.
* Border Leaf Nodes:
* Border Leaf Nodes:Ensuring that the border leaf nodes (the entry and exit points for traffic between data centers) can exchange EVPN routes is critical for the correct dissemination of both L2 and L3 information across the data centers.
Conclusion:
* Option A:Correct-Type 2 EVPN routes are required for Layer 2 MAC address learning and communication across the DCI (Data Center Interconnect).
* Option B:Correct-Border leaf nodes need to exchange EVPN routes to maintain connectivity between data centers.
* Option D:Correct-Type 5 EVPN routes are essential for Layer 3 connectivity across the DCI.
OptionsCandEare incorrect because they refer to establishing full mesh VTEPs (VXLAN Tunnel Endpoints) across all spine or leaf nodes, which is unnecessary for the scenario provided. The focus should be on border leaf nodes and appropriate route advertisements for L2 and L3 connectivity.
NEW QUESTION # 48
Which two statements are correct about an IP fabric? (Choose two.)
- A. The multipath multiple-as statement is required to enable ECMP if every device has a different AS number.
- B. FBGP is only required to route mostrouting information to external devices outside the fabric.
- C. All leaf devices can use the same AS number in an IP fabric without making any adjustments to the EBGP configuration
- D. Only a single point to point EBGP session is required between peers in an IP fabric.
Answer: A,C
Explanation:
* BGP in IP Fabric:
* In an IP fabric, Border Gateway Protocol (BGP) is used to manage the routing between leaf and spine devices. Each device can have the same or different Autonomous System (AS) numbers depending on the network design.
* Multipath Multiple-AS:
* Option B:If every device in the fabric has a different AS number, then enabling Equal-Cost Multi-Path (ECMP) routing requires the multipath multiple-as statement. This configuration allows BGP to consider multiple paths across different AS numbers as equal cost, enabling efficient load balancing across the network.
* Same AS Number Configuration:
* Option A:It's possible for all leaf devices to use the same AS number in an IP fabric, which simplifies the configuration. EBGP (External BGP) will still function correctly in this setup because BGP considers the peering relationship rather than strictly enforcing different AS numbers in this specific use case.
Conclusion:
* Option B:Correct-This statement is essential for enabling ECMP in a multi-AS environment.
* Option A:Correct-Leaf devices can share the same AS number without needing special EBGP configuration.
NEW QUESTION # 49
You are using a single tenant data center with a bridged overlay architecture. In this scenario, how do hosts of the different virtual networks communicate with each other?
- A. using anycast gateway addresses configured on the leaf devices
- B. using EVPN Type 5 routes
- C. off-fabric using an external device
- D. using virtual gateway addresses configured on the spine
Answer: C
Explanation:
* Understanding Bridged Overlay Architecture:
* In a single-tenant data center using a bridged overlay architecture, virtual networks (VLANs) are typically isolated within the fabric, with traffic between these VLANs handled outside the fabric.
* Communication Between Different Virtual Networks:
* A. off-fabric using an external device:This is correct. In many bridged overlay architectures, communication between different virtual networks is handled off-fabric, often using an external router or firewall that connects the different VLANs. The fabric itself primarily provides Layer 2 connectivity within each VLAN, leaving inter-VLAN routing to be handled externally.
Data Center References:
* This design is common in smaller or simpler data center environments where a single tenant does not require complex on-fabric routing and prefers to handle inter-VLAN routing through dedicated devices.
NEW QUESTION # 50
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. Asymmetric routing is easier lo monitor because of the transit VNI.
- B. Symmetric routing needs an extra VLAN with an IRB interface for each L3 VRF instance.
- C. Asymmetric routing routes traffic on the egress switch.
- D. Symmetric routing supports higher scaling numbers.
Answer: C,D
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.
NEW QUESTION # 51
You are preparing an sFlow monitoring system configuration.
In this scenario, what Information will be included in the datagram sent to the sFlow collector? (Choose two.)
- A. the interlace through which the packets entered the agent
- B. the source and destination VLAN for sampled packets
- C. the CRC from the sampled packet
- D. the sending device's serial number
Answer: A,B
Explanation:
* Understanding sFlow Monitoring:
* sFlow is a packet sampling technology used to monitor traffic in a network. It sends sampled packet data and interface counters to an sFlow collector, which analyzes the traffic patterns.
* Information Included in sFlow Datagram:
* Option A:The datagram sent to the sFlow collector includes information about the interface through which the packets entered the agent (the switch or router). This is crucial for understanding where in the network the traffic was captured.
* Option D:sFlow datagrams also include the source and destination VLAN for the sampled packets. This allows for detailed analysis of the traffic flow within different VLANs.
Conclusion:
* Option A:Correct-The ingress interface is included in the sFlow datagram.
* Option D:Correct-The source and destination VLANs are also included, providing context for the sampled traffic.
NEW QUESTION # 52
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