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Juniper JN0-683 Exam Syllabus Topics:
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NEW QUESTION # 39
You are asked to implement VXLAN group-based policies (GBPs) in your data center. Which two statements are correct in (his scenario? (Choose two.)
- A. VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X.
- B. VXLAN GBP uses scalable group tags thatmust be configured statically on each switch and activated through 802.1X.
- C. VXLAN GBP ensures consistent application of security group policies throughout the network.
- D. VXLAN GBP ensures consistent application of BGP groups throughout the network.
Answer: A,C
Explanation:
* VXLAN Group-Based Policies (GBP):
* VXLAN Group-Based Policies are used to apply security policies consistently across the network. These policies are often tied to user or device identities rather than static IP addresses, which allows for more dynamic and scalable security management.
* Scalable Group Tags via RADIUS and 802.1X:
* Option B:VXLAN GBP can use scalable group tags configured on a RADIUS server, which are then pushed to network devices through 802.1X. This allows for centralized and automated policy application based on user or device identity.
* Consistent Security Policy Application:
* Option C:GBP ensures that security policies are consistently applied across the network, regardless of where a user or device connects. This consistency is crucial in environments where security policies must follow the user or device.
Conclusion:
* Option B:Correct-Group tags can be configured on a RADIUS server and pushed via 802.1X, enabling centralized policy management.
* Option C:Correct-GBP ensures consistent application of security policies, which is essential for maintaining security across a dynamic network environment.
NEW QUESTION # 40
Exhibit.
Referring tothe exhibit, which statement is correct?
- A. The remote VTEP is not responding.
- B. The MAC address is known but not reachable by the remote VTEP
- C. VNI 100 is not configured on the remote VTEP.
- D. The MAC address is unknown and not in the forwarding table of the remote VTEP.
Answer: D
Explanation:
* Analyzing the Exhibit Output:
* The command ping overlay tunnel-type vxlan is used to test the VXLAN tunnel between two VTEPs (VXLAN Tunnel Endpoints). The output shows a warning about missing hash parameters, but more importantly, it displays the result: End-System Not Present.
* Understanding the Response:
* The message End-System Not Present indicates that the remote VTEP (192.168.2.20) did not find the MAC address 00:00:5E:00:53:CC in its forwarding table. This typically means that the MAC address is unknown to the remote VTEP, and as a result, it could not forward the packet to the intended destination.
Conclusion:
* Option B:Correct-The MAC address is unknown and is not in the forwarding table of the remote VTEP, which is why the system reports that the "End-System" is not present.
NEW QUESTION # 41
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 5 route.
- B. The VNI should be unique on all devices for each customer site.
- C. The advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 2 route.
- D. The VNI must match on all devices for the same customer.
Answer: A,D
Explanation:
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.
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 # 42
Click the Exhibit button.
The 192.168.0.0/24 route is being advertised into your IP fabric by the leaf device in AS 65512.
In this scenario, which two statements are correct? (Choose two.)
- A. By default, each spine device will not advertise this route to all other peer leaf devices.
- B. By default, both spine devices will reject the route learned from the leaf device.
- C. By default, both spine devices will accept and install the route learned from the leaf device.
- D. By default, each spine device will advertise this route to all other peer leaf devices.
Answer: A,C
Explanation:
The spines learn 192.168.0.0/24 from the leaf over an eBGP session, and Junos will accept and install received BGP routes by default. However, Junos does not advertise routes to BGP peers unless an export policy explicitly permits them, so the spines will not advertise that route onward to the other leaf peers by default.
NEW QUESTION # 43
Click the Exhibit button. You are troubleshooting an IP fabric for your data center. You notice that your traffic is not being load balancing to your spine devices from leaf devices.
Referring to the configuration shown in the exhibit, what must be configured to solve this issue?
- A. The load-balance policy must be applied to the forwarding table under the routing-options hierarchy.
- B. The multipast multiple-as configuration must be configured for each peer in the BGP spine group.
- C. The load-balance policy must be applied as an export policy to your BGP.
- D. The load-balance policy must have a from statement that matches on protocol bgp.
Answer: A
Explanation:
You already have BGP multipath turned on (multiple-as;), so the control plane can install multiple equal-cost routes to the spines.
You also created a load-balance policy (load-balance per-packet;).
But the traffic is still not being balanced → because the policy is not applied anywhere.
In Junos, per-packet (or per-flow) load-balancing is not decided in BGP.
It's decided in the forwarding table (FIB) - the place where the actual packet forwarding happens.
That's why Juniper requires you to "attach" your load-balancing policy to the forwarding table.
NEW QUESTION # 44
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 vlans vn100 13-interface irb.100
- B. set interfaces irb unit 100 family inet address 192-168.100.1
- C. delete vlans vn200 13-interface irb.200
- D. set routing-options static route 0.0.0.0/0 next-hop 192.168.200.10
Answer: A,D
Explanation:
VLAN 100 (BLUE) does not have an IRB interface configured, meaning there is no Layer 3 gateway for hosts in VLAN 100. Adding an IRB.100 interface with an IP address will allow routing between VLAN 100 and VLAN 200.
Even after configuring the IRB interface for VLAN 100, you need to bind it to VLAN 100 so that the switch correctly associates VLAN 100 traffic with the IRB. This ensures that the VLAN can route traffic through the correct Layer 3 gateway.
NEW QUESTION # 45
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 system log (syslog) server to manage system log messages and alerts.
- B. You must have a DHCP server that provides the location of the software image and configuration files.
- C. You must have an NTP server to perform time synchronization.
- D. You must have a file server that stores software image and configuration files.
Answer: B,D
Explanation:
You must have a DHCP server that provides the location of the software image and configuration files: This is necessary because DHCP is typically used in automated provisioning processes to provide the device with its IP address, gateway, and important information like the location of the configuration and software image files. These files are crucial for the device to properly boot and configure itself.
You must have a file server that stores software image and configuration files: A file server (usually TFTP or HTTP server) is required to store the necessary software image and configuration files for the Juniper device. These files are fetched during the provisioning process to set up the device.
NEW QUESTION # 46
You want to suppress unnecessary ARP flooding in your EVPN-VXLAN fabric. Which EVPN route type enables this capability?
- A. Type 2
- B. Type 1
- C. Type 3
- D. Type 4
Answer: A
Explanation:
EVPN Type 2 routes, also known as MAC/IP Advertisement routes, carry both the MAC address and the associated IP address of a host. By distributing this information to all VTEPs, leaf devices can build a local ARP/ND cache and respond directly to ARP requests on behalf of remote hosts, a feature known as ARP suppression, which reduces the amount of ARP broadcast traffic flooded across the fabric.
NEW QUESTION # 47
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. Enable ETS on the GPU facing interfaces.
- B. Modify the load balancing default hashing.
- C. Assign all shared buffers to the lossless queues.
- D. Disable LLDP on interfaces that use DCBX
Answer: A
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 # 48
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. Put the new server on a unique subnet within the tenant's network.
- B. Use a static route in the tenant VRF with a firewall as the next hop for traffic to the new server.
- C. Use route leaking with EVPN and a routing policy.
- D. Use filter-based forwarding.
Answer: D
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 # 49
You are implementing seamless stitching between two data centers and have a proposed configuration for a border leaf device.
In this scenario, which two statements are correct? {Choose two.)
- A. The translation-vni must match in both data centers.
- B. The translation-vni must be different in each data center.
- C. The ESI must be different in each data center.
- D. The ESI must match in both data centers.
Answer: B,D
Explanation:
When implementing seamless VXLAN stitching between two data centers, the Ethernet Segment Identifier (ESI) must match in both data centers to ensure that the same multi-homed segment is recognized consistently across the environments. This allows seamless failover and redundancy. However, the translation VNI (Virtual Network Identifier) must be different in each data center because VXLAN stitching involves mapping different VNIs to enable interconnectivity between distinct VXLAN domains.
If the same translation VNI is used in both data centers, there would be no differentiation between network segments, leading to potential routing and forwarding issues. Keeping them different ensures proper traffic isolation and mapping.
NEW QUESTION # 50
What are three actions available tor MAC move limiting? (Choose three.)
- A. filter
- B. shutdown
- C. drop
- D. log
- E. enable
Answer: B,C,D
Explanation:
* 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.
NEW QUESTION # 51
Whatare two supported methods (or exporting data when using the Junos telemetry interface? (Choose two.)
- A. using gRPC
- B. using REST
- C. using UDP
- D. using SNMP
Answer: A,C
Explanation:
* Junos Telemetry Interface (JTI):
* The Junos Telemetry Interface is a framework that allows network operators to collect real-time telemetry data from Juniper devices. This data can be used for monitoring, analytics, and network automation.
* Data Export Methods:
* Option B:UDP (User Datagram Protocol)is a lightweight, connectionless protocol used for exporting telemetry data quickly with minimal overhead. While it doesn't guarantee delivery, it is suitable for high-speed data transfer where occasional packet loss is acceptable.
* Option D:gRPC (gRPC Remote Procedure Call)is a modern, high-performance method for data export that supports streaming and remote procedure calls, making it ideal for more complex telemetry data use cases.
Conclusion:
* Option B:Correct-UDP is supported for exporting telemetry data.
* Option D:Correct-gRPC is also supported, offering advanced streaming capabilities
NEW QUESTION # 52
Click the Exhibit button. A VXLAN tunnel has been created between leaf1 and leaf2 in your data center.
Referring to the exhibit, which statement is correct?
- A. Traffic sent from server1 to server2 will be tagged with VLAN ID 200 on Ieaf2 and forwarded to server2.
- B. Traffic sent from server1 to server2 will be dropped on Ieaf2.
- C. Traffic sent from server1 to server2 will be tagged with VLAN ID 100 on Ieaf2 and forwarded to server2.
- D. Traffic sent from server1 to server2 will be dropped on leaf1.
Answer: D
Explanation:
D is correct because leaf1, the ingress switch, drops the traffic due to lack of EVPN L2 forwarding entry for destination MAC in a different VNI.
NEW QUESTION # 53
Which two statements are true about IP fabrics using unnumbered BGP? (Choose two.)
- A. Unnumbered BGP peering automatically provisions IPv6 peering.
- B. Unnumbered BGP requires that family inet6 is configured on each interface.
- C. Unnumbered BGP peering automatically provisions IPv4 peering.
- D. Unnumbered BGP requires that family inet is configured on each interface.
Answer: B,C
Explanation:
https://www.juniper.net/documentation/us/en/software/nce/nce-225-bgp-unnumbered/index.html
NEW QUESTION # 54
Exhibit.
Referring to the configuration shown in the exhibit, assume that there is no external router present, and that the configuration is fabric-only.
Which two statements are true about the example configuration? (Choose two.)
- A. Devices in irb.400 (vlan 400) and irb.800 (vlan 800) are able to communicate over the fabric.
- B. VNI 10006is assigned to vlan 800 (irb.800).
- C. Devices in routing instance Customer A are able to communicate with devices in routing instance Customer B
- D. Devices in irb.400 (vlan 400) are not able to communicate directly with devices in routing instance Customer A.
Answer: A,D
Explanation:
* Understanding the Configuration:
* The exhibit shows configurations for two VRFs (Customer_A and Customer_B) with specific VLANs and VNIs assigned. Each VRF has interfaces (IRBs) associated with particular VLANs.
* Communication Between VLANs and Routing Instances:
* Option B:VLAN 400 (irb.400) is part of Customer_B, and there is no direct connection or routing between Customer_A and Customer_B in the configuration provided. Therefore, devices in irb.400 cannot communicate directly with devices in the Customer_A routing instance.
* Option D:Since irb.400 (VLAN 400) and irb.800 (VLAN 800) are part of the same routing instance (Customer_B), they can communicate over the fabric using VXLAN encapsulation.
Conclusion:
* Option B:Correct-There is no direct communication between devices in irb.400 (Customer_B) and routing instance Customer_A.
* Option D:Correct-Devices in VLAN 400 and VLAN 800 can communicate within the Customer_B routing instance over the fabric.
NEW QUESTION # 55
Which statement is correct about MAC mobility in an EVPN-VXLAN environment?
- A. MAC mobility disables ARP suppression for the moved host.
- B. MAC mobility is only supported when using a CRB overlay.
- C. MAC mobility is tracked using a sequence number carried in the EVPN Type 2 route's MAC Mobility extended community.
- D. MAC mobility requires manual reconfiguration of the VTEP when a host moves.
Answer: C
Explanation:
When a host moves from one VTEP to another, the newly attached VTEP advertises an updated EVPN Type 2 route containing a MAC Mobility extended community with an incremented sequence number. This allows other VTEPs in the fabric to recognize that the host has moved and update their forwarding tables accordingly, preventing stale MAC-to-VTEP mappings and MAC flapping.
NEW QUESTION # 56
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