JN0-683信息資訊，JN0-683資料

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Juniper JN0-683 考試大綱：

主題	簡介
主題 1	Data Center Deployment and Management: This section assesses the expertise of data center networking professionals like architects and engineers, focusing on key deployment concepts. Topics include Zero-touch provisioning (ZTP), which automates device setup in data centers without manual input.
主題 2	EVPN-VXLAN Signaling: This section assesses an understanding of Ethernet VPN (EVPN) concepts, including route types, multicast handling, and Multiprotocol BGP (MBGP). It also covers EVPN architectures like CRB and ERB, MAC learning, and symmetric routing.
主題 3	Data Center Multitenancy and Security: This section tests knowledge of single-tenant and multitenant data center setups. Candidates such as Data Center Professionals are evaluated on ensuring tenant traffic isolation at both Layer 2 and Layer 3 levels in shared infrastructure environments.
主題 4	VXLAN: This part requires knowledge of VXLAN, particularly how the control plane manages communication between devices, while the data plane handles traffic flow. Demonstrate knowledge of how to configure, Monitor, or Troubleshoot VXLAN.

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最新的 JNCIP-DC JN0-683 免費考試真題 (Q84-Q89):

問題 #84
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 5 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 2 EVPN route for each unique prefix.

答案：A,B

解題說明：
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.

問題 #85
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 routing instance Customer A are able to communicate with devices in routing instance Customer B
B. Devices in irb.400 (vlan 400) and irb.800 (vlan 800) are able to communicate over the fabric.
C. Devices in irb.400 (vlan 400) are not able to communicate directly with devices in routing instance Customer A.
D. VNI 10006is assigned to vlan 800 (irb.800).

答案：B,C

解題說明：
* 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.

問題 #86
Click the Exhibit button.

Referring to the exhibit, which two statements are correct? (Choose two.)

A. Each leaf device removes the VXLAN header and forwards the Layer 2 frame with original source and destination MAC address.
B. Each leaf device encapsulates Layer 2 frames in VXLAN packets and performs Layer 3 forwarding on the Layer 3 IP fabric.
C. Each leaf device acts as a bridge between the VNIs and allows traffic from one VNI to be forwarded to a different VNI.
D. Each leaf device replaces the source MAC address of the original frame with the MAC address of the gateway interface.

答案：A,B

解題說明：
The leaf switches function as VTEPs: they encapsulate customer Layer 2 frames into VXLAN over the routed IP underlay, which then forwards the packets based on the outer IP header.
When the VXLAN packet reaches the destination leaf, that leaf decapsulates the VXLAN header and forwards the original Layer 2 frame toward the attached server, preserving the original source and destination MAC addresses.

問題 #87
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 decreases when you add leaf devices.
B. The oversubscription ratio remains the same when you remove leaf devices.
C. The oversubscription ratio remains the same when you add leaf devices.
D. The oversubscription ratio increases when you remove leaf devices.

答案：C,D

解題說明：
Adding leaf devices increases the edge bandwidth (workload-facing ports), which lowers the oversubscription ratio because the amount of bandwidth facing the workloads increases relative to the fabric bandwidth.
However, the oversubscription ratio itself remains the same when you add leaf devices if the fabric design and spine capacity remain unchanged because the ratio is a function of edge bandwidth to spine bandwidth. Adding leaf devices without changing spine devices keeps the ratio at the same level.
Removing leaf devices would increase the oversubscription ratio because the amount of edge bandwidth decreases while spine bandwidth remains the same.

問題 #88
Which two statements describe the function of the Designated Forwarder (DF) in an EVPN- VXLAN all-active multihoming scenario? (Choose two.)

A. It forwards all unicast known traffic for the segment.
B. It prevents duplicate BUM traffic from being sent to the multihomed CE device.
C. It is responsible for forwarding BUM traffic to the multihomed segment.
D. It is elected per Ethernet Segment and VLAN.

答案：B,C

解題說明：
In all-active multihoming, multiple PEs can forward known unicast traffic simultaneously, but only one PE, the Designated Forwarder, is responsible for forwarding broadcast, unknown unicast, and multicast (BUM) traffic to the multihomed segment. This prevents duplicate BUM frames from being delivered to the CE device over multiple links, since all attached PEs receive the same BUM traffic from the fabric but only the DF forwards it downstream.

問題 #89
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