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Juniper JN0-683 Exam Syllabus Topics:
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NEW QUESTION # 24
Referring to the exhibit, which statement is correct?
- A. The MAC address is unknown and not in the forwarding table of the remote VTEP.
- B. The remote VTEP is not responding.
- C. VNI 100 is not configured on the remote VTEP.
- D. The MAC address is known but not reachable by the remote VTEP.
Answer: A
Explanation:
The output shows a VXLAN ping test using ping overlayto verify VXLAN reachability between VTEPs (Virtual Tunnel Endpoints). The test successfully reaches the remote VTEP
192.168.2.20, meaning the VXLAN tunnel is functional. However, the response indicates "End- System Not Present," which means that while the VXLAN segment is active on the remote VTEP, the specified MAC address (00:00:5E:00:53:CC) is not known in the forwarding table of the remote VTEP.
NEW QUESTION # 25
In a Junos EVPN-VXLAN fabric, which underlay routing protocol is most commonly recommended for a large-scale IP fabric due to its scalability and fast convergence?
- A. EBGP
- B. RIP
- C. OSPF
- D. IS-IS
Answer: A
Explanation:
External BGP (EBGP) is the most commonly recommended underlay protocol for large-scale Clos-based IP fabrics because it scales well with a large number of devices, provides granular routing policy control, and offers predictable, fast convergence when each device is assigned its own autonomous system number in a single-hop EBGP design between leaf and spine devices.
NEW QUESTION # 26
Which three statements are correct about VXLAN control planes? (Choose three.)
- A. EVPN enables fast convergence and updates.
- B. EVPN is inefficient and does not scale well.
- C. Multicast does not require as many resources.
- D. Both multicast and EVPN can facilitate MAC learning.
- E. Multicast is not agile and requires manual VNI mapping.
Answer: A,C,D
Explanation:
EVPN enables fast convergence and updates: EVPN (Ethernet VPN) provides a more scalable and efficient control plane for VXLAN, enabling fast convergence and quicker updates for network changes. This is achieved through the use of BGP (Border Gateway Protocol) as the control plane protocol, which allows for efficient distribution of MAC and IP address information.
Both multicast and EVPN can facilitate MAC learning: Both multicast and EVPN can handle MAC address learning in a VXLAN environment. In multicast-based VXLAN, MAC addresses are learned and distributed via multicast control messages, whereas in EVPN, MAC addresses are distributed via BGP advertisements, which are more efficient and scalable.
Multicast does not require as many resources: Multicast-based VXLAN control planes use standard multicast protocols like PIM (Protocol Independent Multicast) to forward traffic across the VXLAN fabric. While multicast has resource requirements for managing multicast groups, it does not require the same level of control-plane processing as EVPN, which uses BGP to handle MAC address advertisements. However, multicast can be less agile and may require additional configuration.
NEW QUESTION # 27
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 2 EVPN routes across the DCI.
- B. Ensure there is a full mesh of VTEPs between all leaf nodes within data centers.
- C. Ensure border leaf nodes in each data center can exchange EVPN routes.
- D. Ensure there is a full mesh of VTEPs between all spine nodes within both data centers.
- E. Advertise Type 5 EVPN routes across the DCI.
Answer: A,C,E
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 # 28
Which two statements are true about IP fabrics using unnumbered BGP? (Choose two.)
- A. Unnumbered BGP peering automatically provisions IPv6 peering.
- B. Unnumbered BGP peering automatically provisions IPv4 peering.
- C. Unnumbered BGP requires that family inet is configured on each interface.
- D. Unnumbered BGP requires that family inet6is configured on each interface.
Answer: B,C
Explanation:
* Understanding Unnumbered BGP:
* Unnumbered BGP (Border Gateway Protocol) allows BGP peering between routers without assigning specific IP addresses to the interfaces. Instead, it uses the loopback address or another router identifier for the BGP session, making IP address management more straightforward in large-scale networks.
* Family inet Configuration:
* Option C:The family inet configuration is required on each interface involved in unnumbered BGP peering to support IPv4 address families. This ensures that IPv4 peering sessions can be established between devices.
* Automatic IPv4 Peering:
* Option D:Unnumbered BGP peering automatically provisions IPv4 peering sessions. This simplifies the configuration by eliminating the need to manually assign and manage IP addresses for BGP peering.
Conclusion:
* Option C:Correct-Unnumbered BGP requires the family inet configuration for IPv4.
* Option D:Correct-Unnumbered BGP automatically provisions IPv4 peering, simplifying setup.
NEW QUESTION # 29
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 EVPN Type 5 routes
- B. using anycast gateway addresses configured on the leaf devices
- C. using virtual gateway addresses configured on the spine
- D. off-fabric using an external device
Answer: D
Explanation:
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.
off-fabric using an external device: 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.
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 # 30
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 table label
- C. the VRF target community
- D. the routing instance type
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 # 31
Referring to the exhibit, the spine1 device has an underlay BGP group that in 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. The multihop statement is required to establish the underlay BGP sessions.
- D. Load balancing for the underlay is not configured correctly.
Answer: A,B
Explanation:
The multihop statement is not required to establish the underlay BGP sessions: In this scenario, the BGP peering is done with directly connected neighbors, so the multihop statement is not necessary. The multihop statement is typically used when BGP peers are not directly connected and are separated by intermediate devices. Since the peering is established directly between spine1 and the other devices, no multihop configuration is needed.
Load balancing for the underlay is configured correctly: The configuration shows the use of multipath with the multiple-as option, which enables ECMP (Equal-Cost Multi-Path) load balancing for the underlay network. This configuration allows for traffic to be distributed across multiple paths to the BGP neighbors, assuming multiple equal-cost paths exist, and the multiple- as option enables the use of multiple autonomous systems for load balancing.
NEW QUESTION # 32
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 IP address of the FTP server
- B. the MAC address of the FTP server
- C. the management IP address for each OFX5120
- D. the MAC address for each OFX5120
Answer: C,D
NEW QUESTION # 33
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 # 34
You need to load-balance traffic across multiple links to a multihomed CE device using ESI-LAG in all-active mode. Which protocol is used between the CE and the leaf devices to achieve this?
- A. STP
- B. VRRP
- C. GRE
- D. LACP
Answer: D
Explanation:
When a CE device is multihomed to multiple leaf devices in all-active mode using ESI-LAG, the Link Aggregation Control Protocol (LACP) is used between the CE and each leaf device to bundle the physical links into a logical aggregated Ethernet interface. This allows traffic to be load- balanced across all active links while the leaf devices coordinate over EVPN to present a consistent forwarding view to the CE.
NEW QUESTION # 35
Click the Exhibit button. 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. Change: 5001 in the route-distinguisher to: 10010.
- C. Add encapsulation vxlan to the evpn hierarchy.
- D. Move vrf-target target: 65000:1 to the evpn hierarchy.
Answer: C
Explanation:
For EVPN Type 5 route advertisement and full inter-data center connectivity, the EVPN configuration must specify the encapsulation type, especially if VXLAN is used as the data-plane overlay.
The parameter encapsulation vxlan must be added under the protocols evpn hierarchy to ensure border leaf devices can advertise and exchange IP prefix routes (Type 5) properly between data centers.
The option to move vrf-target under the EVPN hierarchy is not valid, as that statement is only supported within the routing instance or vni-options section, but not directly under protocols evpn.
NEW QUESTION # 36
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. Type 2 seamless stitching
- B. IP VPN
- C. EVPN Type 2 stretch
- D. over the top full-mesh interconnect
Answer: A
Explanation:
* 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.
NEW QUESTION # 37
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 lo satisfy these requirements?
- A. Use IRB interfaces with the same IP and VGA.
- B. Use IRB interfaces with the same IP and MAC address.
- C. Use IRB interfaces with different IP addresses and the same VGA.
- D. Use IRB interfaces with the same IP address and different MAC addresses.
Answer: B
Explanation:
* Redundant Gateways in EVPN-VXLAN:
* In an EVPN-VXLAN environment, providing redundant gateway functionality typically involves the use of Anycast Gateway. This allows multiple PEs (Provider Edge devices) to use the same IP address and MAC address for the gateway, enabling seamless failover and redundancy without IP conflicts.
* Conserving Address Space:
* Using the same IP address across multiple PEs conserves address space because only one IP address is needed for the gateway function, regardless of the number of PEs. The shared MAC address ensures that ARP resolution and forwarding behavior are consistent across all the PEs.
Conclusion:
* Option C:Correct-Using IRB interfaces with the same IP and MAC address across all PEs satisfies the need for redundancy while conserving address space.
OptionsA, B,andDintroduce unnecessary complexity or do not fully utilize the efficient Anycast Gateway approach, which is best practice for conserving IP space and providing redundancy.
NEW QUESTION # 38
Which statement is correct regarding ESI-LAG multihoming in an EVPN-VXLAN fabric?
- A. The same Ethernet Segment Identifier is configured on all leaf devices connected to the same multihomed CE device.
- B. Each multihomed device must be assigned a unique Ethernet Segment Identifier per leaf.
- C. ESI-LAG requires a dedicated MC-LAG peer link between leaf devices.
- D. ESI-LAG can only operate in single-active mode.
Answer: A
Explanation:
When a customer edge (CE) device is multihomed to two or more leaf devices using ESI-LAG, all the leaf devices attached to that segment must be configured with the identical Ethernet Segment Identifier (ESI). This common ESI allows the leaf devices to recognize they share the same Ethernet segment and to coordinate designated forwarder election and traffic load balancing, typically in all-active mode, without needing a separate peer link as MC-LAG requires.
NEW QUESTION # 39
You are using filter-based forwarding with a VXLAN overlay. In this scenario, which two statements are correct? (Choose two.)
- A. Filter-based forwarding uses a routing policy to match Layer 3 source and destination addresses.
- B. Filter-based forwarding forwards traffic to a different VRF.
- C. Filter-based forwarding applies a firewall filter on the VXLAN gateway.
- D. Filter-based forwarding uses a family inet firewall filter to match source and destination MAC addresses.
Answer: B,C
Explanation:
Filter-based forwarding enables traffic steering into a different VRF by applying a firewall filter action that redirects matched traffic to an alternate routing instance. In a VXLAN overlay, this filter is applied on the VXLAN gateway interface to classify and redirect traffic entering or exiting the gateway.
NEW QUESTION # 40
You are designing a DCI solution and want to prevent the extension of BUM traffic and Ethernet Segment information between data centers while still allowing IP prefix reachability. Which EVPN seamless stitching type should you use?
- A. Type 3 seamless stitching using multicast replication.
- B. Type 1 seamless stitching using Layer 2 stretching.
- C. Type 2 seamless stitching using border leaf VXLAN tunnels.
- D. Type 5 seamless stitching using only IP Prefix routes.
Answer: D
Explanation:
When only Layer 3 reachability between data centers is desired, and Layer 2 extension along with associated BUM traffic and Ethernet Segment routes should not cross the DCI, a Type 5 (IP Prefix route) only interconnect is used. Border leaf devices exchange only EVPN Type 5 routes across the DCI, providing inter-subnet routing between data centers while keeping each data center's Layer 2 broadcast domain isolated.
NEW QUESTION # 41
You must integrate several leaf nodes that do not support the EVPN-VXLAN architecture into your existing EVPN-VXLAN-based IP fabric. In this scenario, which two design considerations would accomplish this task? (Choose two.)
- A. Ethernet segment identifier
- B. collapsed fabric
- C. generic routing encapsulation
- D. edge-routed bridging
Answer: B,D
Explanation:
Edge-routed bridging allows integrating devices that are not EVPN-VXLAN capable by extending Layer 2 at the edge while using routing toward the fabric, enabling those leaves to connect without participating in the EVPN control plane. A collapsed fabric design can place overlay functions on a subset of capable devices while keeping other leaf nodes operating as simpler routed/bridged nodes, allowing coexistence within the same fabric.
NEW QUESTION # 42
You are deploying an IP fabric using EBGP and notice that your leaf devices are advertising 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 loops 2.
- B. You need to configure a next-hop self policy.
- C. You need to configure as-override.
- D. You need to configure multipath multiple-as.
Answer: A,D
NEW QUESTION # 43
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. Only the border and leaf devices will have L3 VXLAN gateways.
- E. Spine devices will have no 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 # 44
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