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| Section | Objectives |
|---|---|
| Topic 1: Versa SD-WAN Platform Components | - Versa Controller, Director, Analytics roles - VOS components and CPE devices |
| Topic 2: Monitoring, Analytics and Troubleshooting | - Troubleshooting SD-WAN performance issues - Versa Analytics dashboards |
| Topic 3: Security and Encryption | - Encryption and certificate management - Firewall policies and security services |
| Topic 4: Deployment and Provisioning | - ZTP and onboarding workflows - Branch and edge deployment models |
| Topic 5: QoS and Performance Optimization | - QoS/CoS configuration - Latency, jitter, and bandwidth optimization |
| Topic 6: SD-WAN Fundamentals and Architecture | - Underlay and overlay network design - SD-WAN principles and architecture concepts |
| Topic 7: Policy-Based Routing and Traffic Steering | - Application-aware routing policies - Path selection and SLA-based steering |
| Topic 8: High Availability and Redundancy | - HA active-active and failover design - Redundant gateway and link resiliency |
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問題 #37
Examine the exhibit below.
A DoS Profile shown in the exhibit is applied to an SD-WAN branch.
Referring to the exhibit, which statement is correct?
答案：B
解題說明：
The correct answer is B . The DoS profile in the exhibit is a Classified Profile using Source IP Only as the classification key. For TCP flood protection, the profile is enabled and shows an Alarm Rate of 5000 packets per second , an Activate Rate of 7000 packets per second , a Maximum Rate of 100000 packets per second , a Drop Period of 300 seconds , and an action of Random . This means the first threshold, 5000 pps, is used to trigger alarm behavior, while the second threshold, 7000 pps, activates the configured mitigation action. Since the selected action is Random , packets are randomly dropped when the TCP rate reaches the activate threshold.
Versa documentation shows that DoS policies can match traffic using source, destination, service, application, schedule, IP version, DSCP, and other conditions, and that a DoS policy can set either an aggregate or classified DoS profile. It also documents that DoS policies support enforcement actions and logging through LEF profiles for DoS events. Therefore, 7000 pps does not merely generate an alarm, and it does not mean complete dropping. Complete dropping is not selected in the exhibit.
問題 #38
Examine the CLI output in the exhibit.
You are reviewing the OSPF adjacency on a VOS CPE, and the output is shown in the exhibit. In this scenario, what is the probable cause of the OSPF adjacency issue?
答案：A
解題說明：
The correct answer is B . The exhibit shows the OSPF neighbor in the exst state, which means Exchange Start . Versa documentation lists the OSPF neighbor state codes and identifies exst as "exchange start," followed by exchange, loading, and full. In normal OSPF adjacency formation, neighbors progress through initialization and two-way communication before they negotiate database exchange. If the neighbor becomes stuck in ExStart or Exchange, a common and highly probable cause is an MTU mismatch between the two OSPF peers. During database description packet negotiation, the peers must agree on parameters that allow LSDB exchange; an MTU mismatch can prevent the adjacency from advancing to Full.
Option A is less likely because an area mismatch usually prevents the neighbor relationship from forming correctly rather than leaving it stuck in ExStart. Option C is also incorrect because the neighbor has already progressed beyond early states, which indicates that bidirectional communication has occurred. Option D is not the best answer because dropping OSPF multicast 224.0.0.5 would typically prevent discovery or keep the adjacency in an earlier state, not specifically in ExStart.
Therefore, the probable cause is an interface MTU mismatch.
問題 #39
Examine the exhibit below.
You are onboarding the SOLDEU-R2 branch device using the staging script. You cannot get a Versa- Provider-Controller-VR IP address assigned, indicating that the IPsec tunnel to the corrector has not come up.
You verified that the cables have been connected to the correct ports.
What has caused this issue?
答案：C
解題說明：
The issue is caused by specifying the incorrect WAN port in the staging script. In the exhibit, the SOLDEU- R2 branch is physically connected to the Internet cloud through vni-0/0 , while vni-0/1 is shown as the inter- device link toward SOLDEU-R1. However, the show interfaces brief output shows that the WAN IP address
192.168.122.121/24 has been assigned to vni-0/1.0 , not to the Internet-facing interface. Since the cables are confirmed to be connected correctly, the mismatch must be in the staging script interface selection, not in the cabling.
Versa documentation states that during SD-WAN staging, the branch establishes an IKE session with the Controller, and after that the Controller assigns an IP address to the branch device. Versa troubleshooting guidance also states that after transport connectivity to the Controller is established, the branch forms IKE-based IPsec connectivity, and if this succeeds, the ptvi interface toward the Controller comes up. If IKE/IPsec fails, the ptvi interface remains down. Because the staged WAN IP is placed on the wrong VNI interface, the branch cannot reach the Controller over the intended Internet transport, so the Controller tunnel does not come up.
問題 #40
Examine the exhibit below.
The exhibit shows a device group created for a new group of hubs. The device template called "BMBF- TEMPLATE" has an Address object called "Server". A network administrator creates the Class of Service Template called "Ship-CoS-IT" that has an Address object with the same name. Then it tries to onboard a new device to this device group.
Which statement is true about the configuration that this device will have?
答案：C
解題說明：
The correct answer is D . In the displayed post-staging template association order, the device template BMBF- TEMPLATE is applied before the QoS service template Ship-CoS-IT . Versa documentation explains that device templates, also called post-staging templates, provide the baseline configuration for devices, while service templates are service-specific configurations that can be applied to device configurations. It also states that service templates are associated with device groups and that, in a device group, the administrator can choose the order in which service templates are applied.
Because the QoS template is later in the shown association order, the final merged device configuration uses the Address object definition from the QoS template when the same object name exists in both templates. It does not automatically create two copies of the same Address object, because the object name is the key for the configuration element. It also should not fail merely because the same object name exists in a later template; the merge behavior resolves the effective configuration according to the template order. Therefore, the onboarded hub device receives the Server Address object version from Ship-CoS-IT, the QoS template.
問題 #41
A branch device has completed Stage 3 onboarding. Which set of tunnels or sessions should exist after the device becomes fully operational in the customer SD-WAN network?
答案：D
解題說明：
The correct answer is A . In Versa Secure SD-WAN onboarding, the branch moves through three staging phases before becoming fully operational. Versa documentation states that in Stage 3 , Versa Director pushes the stage-three configuration to the branch device over the IKE session and reboots the branch. After this stage, the branch becomes fully operational and is part of the customer SD-WAN network. At this point, IKE and IPsec sessions are created between the branch and Controller , and VXLAN and ESP sessions are created between branch to branch .
This distinction is important because the Controller connection is used for SD-WAN control-plane functions, while branch-to-branch overlay communication uses tunnel encapsulation for data forwarding. The documentation also notes that branch-to-branch ESP is maintained using a lightweight DH key-pair proprietary protocol.
Options B, C, and D are incorrect. HTTPS to Director alone does not represent the complete SD-WAN operational tunnel state. BGP to Analytics is not the required operational tunnel set. GRE-only tunnels without IPsec do not match the Versa Stage 3 SD-WAN tunnel behavior described in the staging documentation.
問題 #42
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