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JNCIP-DC Dumps JN0-683 Exam for Full Questions - Exam Study Guide
Juniper JN0-683 Exam Syllabus Topics:
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NEW QUESTION # 20
You are deploying an 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 remove leaf devices.
- B. The oversubscription ratio decreases when you add leaf devices.
- C. The oversubscription ratio remains the same when you add leaf devices.
- D. The oversubscription ratio increases when you remove leaf devices.
Answer: C,D
Explanation:
* Understanding Oversubscription Ratio in IP Fabrics:
* The oversubscription ratio in an IP fabric typically refers to the ratio of the available bandwidth at the edge of the network (leaves) to the available bandwidth at the core or spine. A 3:1 oversubscription ratio means that for every 3 units of bandwidth at the leaves, there is 1 unit of bandwidth at the spine.
* Impact of Adding or Removing Leaf Devices:
* Removing Leaf Devices:When you remove leaf devices, the amount of total edge bandwidth decreases while the bandwidth in the spine remains constant. This causes the oversubscription ratio toincreasebecause there is now less total bandwidth to distribute across the same amount of spine bandwidth.
* Adding Leaf Devices:Conversely, when you add leaf devices, the total edge bandwidth increases. Since the spine bandwidth remains the same, the oversubscription ratio would remain the same if the additional leaves consume their share of the available bandwidth proportionally.
Conclusion:
* Option C:Correct-Removing leaf devices increases the oversubscription ratio.
* Option D:Correct-Adding leaf devices typically maintains the oversubscription ratio assuming uniform bandwidth distribution.
NEW QUESTION # 21
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 VNI must match on all devices for the same customer.
- B. The advertise direct-nexthop option enables the receiver to resolve the next-hop route using only information carried in the Type 2 route.
- C. The VNI should be unique on all devices for each customer site.
- 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: A,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 # 22
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 a Type 2 EVPN route for each unique prefix.
- B. Configure peering for EVPN between border leaf nodes in each data center.
- C. Configure peering for EVPN between all leaf nodes within each data center.
- D. Configure a Type 5 EVPN route for each unique prefix.
Answer: B,D
Explanation:
* Interconnecting Data Centers:
* The scenario requires interconnecting two data centers with unique IP spaces across an IP backbone. The key point is that bridging is not required, so Layer 3 routing methods must be used.
* EVPN Configuration:
* Option B:Establishing EVPN peering between the border leaf nodes in each data center is the most appropriate solution as it allows for exchanging routing information between the two data centers. This ensures that the routes are properly distributed without the need for L2 bridging.
* Option C:Configuring Type 5 EVPN routes is necessary for advertising IP prefixes (Layer 3 routes) across the EVPN. Type 5 routes allow for the exchange of IP prefixes between the two data centers, enabling the necessary routing functionality without the need for bridging.
Conclusion:
* Option B:Correct-Peering between border leaf nodes sets up the necessary route exchange between data centers.
* Option C:Correct-Type 5 EVPN routes are essential for exchanging Layer 3 prefixes between data centers.
NEW QUESTION # 23
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. Devices in irb.400 (vlan 400) are not able to communicate directly with devices in routing instance Customer A.
- C. Devices in routing instance Customer A are able to communicate with devices in routing instance Customer B
- D. VNI 10006 is assigned to vlan 800 (irb.800).
Answer: A,B
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 # 24
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. Change: 5001 in the route-distinguisher to : 10010.
- B. Move vrf-target target: 65000:1 to the evpn hierarchy.
- C. Add a VLAN configuration with an 13-interface to the tenant1 routing instance.
- D. Add encapsulation vxlan to the evpn hierarchy.
Answer: B
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 # 25
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. show interfaces terse vtep.32770 statistics
- B. show interfaces vtep.32770 detail
- C. show interface terse vtep.32770
- D. monitor traffic interface xe-0/0/12
Answer: A
Explanation:
* 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.
NEW QUESTION # 26
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. Load balancing for the underlay is configured correctly.
- B. The multihop statement is required to establish the underlay BGP sessions.
- 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,D
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 # 27
Which statement is correct about a collapsed fabric EVPN-VXLAN architecture?
- A. Using Virtual Chassis at the leaf layer increases resiliency.
- B. It supports multiple vendors in the fabric as long as all the spine devices are Juniper devices deployed with L2 VTEPs
- C. Fully meshed back-to-back links are needed between the spine devices.
- D. Border gateway functions occur on border leaf devices.
Answer: D
Explanation:
Border gateway functions occur on border leaf devices: In a collapsed fabric EVPN-VXLAN architecture, the border leaf devices are responsible for interconnecting the data center to external networks (such as the WAN or other data centers). These devices perform the border gateway functions, such as handling routing and bridging for external communication.
NEW QUESTION # 28
Referring to the exhibit, when Host A sends an ARP request for Host B's IP address, which Junos feature does leaf1 require to send an ARP response back to Host A without having to send a broadcast frame over the fabric?
- A. DAD
- B. GARP
- C. proxy NDP
- D. proxy ARP
Answer: D
Explanation:
proxy ARP: In this scenario, when Host A sends an ARP request for Host B's IP address, leaf1 can use proxy ARP to respond to the ARP request without needing to forward it as a broadcast over the fabric. Proxy ARP allows leaf1 to reply with Host B's MAC address even though Host A and Host B are not directly connected on the same network segment. The leaf switch acts as the proxy for the destination IP.
NEW QUESTION # 29
You are asked for TX and RX traffic statistics for each interface to which an application server is attached. The statistics need to be reported every five seconds. Using the Junos default settings, which telemetry method would accomplish this request?
- A. gNMI
- B. OpenConfig
- C. Native Sensors
- D. SNMP
Answer: C
Explanation:
Native Sensors: Junos provides "Native Sensors" as part of its telemetry capabilities, which can be used to gather interface statistics like TX (transmit) and RX (receive) traffic. With the default configuration, native sensors can be configured to report traffic statistics at a specified interval, such as every five seconds, making this the correct method to fulfill the requirement for periodic traffic reporting.
NEW QUESTION # 30
Click the Exhibit Button. Which number of potential paths would traffic entering Leaf-A with a destination connected to Leaf-B have over the referenced IP fabric?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
In a leaf-spine IP fabric, traffic between two leaves is typically load-balanced using ECMP across all available spine nodes that connect to both leaves. Since Leaf-A and Leaf-B are each connected to three spines, there are three equal-cost next hops available, resulting in three potential paths.
NEW QUESTION # 31
Which statement is true regarding the use of a route reflector in an EVPN-VXLAN overlay?
- A. The route reflector reduces the number of iBGP sessions required by reflecting overlay routes between leaf devices.
- B. The route reflector participates in the data plane forwarding of VXLAN traffic.
- C. The route reflector is only used for the underlay IGP.
- D. The route reflector must be placed on every leaf device.
Answer: A
Explanation:
In an EVPN-VXLAN overlay using iBGP, a route reflector allows leaf devices to establish a single iBGP session with the reflector instead of a full mesh of sessions with every other leaf. The route reflector then reflects EVPN routes between clients, reducing control-plane complexity and improving scalability, while typically not participating directly in VXLAN data-plane forwarding.
NEW QUESTION # 32
A customer wants any device-to-device link in the routed underlay infrastructure to fail over in less than two seconds. They do not want to adjust the routing protocol timers due to the size of the network. In this scenario, which feature should they use to satisfy the requirements?
- A. LLDP
- B. MC-LAG
- C. BFD
- D. RSTP
Answer: C
Explanation:
Bidirectional Forwarding Detection provides fast, lightweight link failure detection independent of routing protocol hello/dead timers. By running BFD with the routing protocol, the control plane can withdraw routes and converge in sub-second to sub-two-second timeframes without tuning the routing protocol timers, which suits large-scale underlays.
NEW QUESTION # 33
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 bridge-domains VLAN-100 routing-interface irb.100
- B. set vlans VLAN-100 13-interface irb.100
- C. set protocols ospf area 0.0.0.0 interface irb.100 passive
- D. set protocols isis interface irb.100 passive
Answer: A
Explanation:
* 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.
NEW QUESTION # 34
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 ensures consistent application of security group policies throughout the network.
- C. VXLAN GBP uses scalable group tags that must be configured statically on each switch and activated through 802.1X.
- D. VXLAN GBP ensures consistent application of BGP groups throughout the network.
Answer: A,B
Explanation:
VXLAN GBP ensures consistent application of security group policies throughout the network: VXLAN Group-Based Policies (GBP) allow for the consistent application of policies related to security groups, network access, and traffic control across all devices in the VXLAN fabric. This helps ensure that security policies are applied consistently based on group membership rather than relying solely on IP subnets or VLANs.
VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X: In VXLAN GBP, scalable group tags (SGTs) are used to identify group memberships. These tags can be configured on a RADIUS server and pushed to the switch using 802.1X authentication, which dynamically applies group-based policies based on user or device attributes.
NEW QUESTION # 35
Click the Exhibit button.
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 lo0.0 parameter on Leaf-1.
- C. Configure the set switch-options route-distinguisher 192.168.100.51:2 parameter on Leaf-1.
- D. Configure the set switch-options service-id 1 parameter on Leaf-2.
Answer: A,B
NEW QUESTION # 36
Click the Exhibit button.
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. Devices in irb.400 (vlan 400) are not able to communicate directly with devices in routing instance Customer A.
- C. Devices in routing instance Customer A are able to communicate with devices in routing instance Customer B.
- D. VNI 10006 is assigned to vlan 800 (irb.800).
Answer: A,B
Explanation:
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.
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.
NEW QUESTION # 37
Which protocol permits the highest level of scalability for an IP underlay fabric?
- A. VXLAN
- B. RIP
- C. RSVP
- D. EBGP
Answer: D
Explanation:
EBGP provides high scalability in IP underlay fabrics by supporting large-scale route distribution with strong policy control and loop prevention through AS path mechanisms. It enables scalable ECMP, efficient route advertisement, and operational isolation between nodes, making it well suited for large data center spine-leaf architectures.
NEW QUESTION # 38
You are designing an IP fabric tor a large data center, and you are concerned about growth and scalability.
Which two actions would you take to address these concerns? (Choose two.)
- A. Design a five-stage Clos IP fabric.
- B. Use EX4300 Series devices as the spine devices.
- C. Use OFX5700 Series devices as the super spines.
- D. Design a three-stage Clos IP fabric.
Answer: C,D
Explanation:
* Clos IP Fabric Design:
* A Clos fabric is a network topology designed for scalable, high-performance data centers. It is typically arranged in multiple stages, providing redundancy, high bandwidth, and low latency.
* Three-Stage Clos Fabric:
* Option B:A three-stage Clos fabric, consisting of leaf, spine, and super spine layers, is widely used in data centers. This design scales well and allows for easy expansion by adding more leaf and spine devices as needed.
* Super Spines for Scalability:
* Option D:Using high-capacity devices like the QFX5700 Series as super spines can handle the increased traffic demands in large data centers and support future growth. These devices provide the necessary bandwidth and scalability for large-scale deployments.
Conclusion:
* Option B:Correct-A three-stage Clos fabric is a proven design that addresses growth and scalability concerns in large data centers.
* Option D:Correct-QFX5700 Series devices are suitable for use as super spines in large-scale environments due to their high performance.
NEW QUESTION # 39
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 bridge-domains VLAN-100 routing-interface irb.100
- B. set vlans VLAN-100 13-interface irb.100
- C. set protocols ospf area 0.0.0.0 interface irb.100 passive
- D. set protocols isis interface irb.100 passive
Answer: A
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 # 40
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