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| Section | Weight | Objectives |
|---|---|---|
| Network Topologies and Routing | 15% | - High availability and redundancy - Routing protocols and path selection - Hub-and-spoke, full-mesh, hybrid topologies |
| Configuration and Provisioning | 15% | - Zero-touch provisioning - Template-based configuration - Service deployment and onboarding |
| Operations and Troubleshooting | 5% | - Monitoring and logging - Diagnostics and problem resolution |
| Versa SD-WAN Infrastructure | 20% | - Versa Director components and functions - Edge device management and deployment - Versa Controller and Analytics |
| Security Services | 10% | - VPN and encryption - Segmentation and threat protection - Integrated firewall and IPS |
| Underlay and Overlay Technologies | 20% | - Overlay connectivity and tunneling - Overlay architecture and concepts - Underlay network design and requirements |
| SD-WAN Services and Policies | 15% | - Application steering and traffic policies - SLA monitoring and link optimization - QoS and bandwidth management |
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質問 # 57
Examine the exhibit below.
As an administrator of a Versa Secure SD-WAN deployment, you are asked to find the current bandwidth of each WAN circuit used for SD-WAN connectivity in a branch, but Versa Director is not displaying any information for the WAN circuits. In this scenario, what should be done to get the graph populated for all WAN circuits?
正解：D
解説：
The correct answer is B . In the exhibit, Versa Director shows multiple branch interfaces and a Live Data column. To populate the bandwidth graph with current real-time statistics for all WAN circuits, Live Data must be selected for each WAN circuit that should be monitored. Versa documentation states that from a Director node, administrators can monitor VOS devices, provider organizations, tenants, events, and alarms. It also explains that Versa Director, together with Versa Analytics, can poll VOS devices in real time to provide visibility into what is happening on those devices and to assist with troubleshooting.
Because the requirement is to find the current bandwidth of each WAN circuit, simply refreshing the page is not enough. Refreshing only reloads the dashboard; it does not enable real-time polling for interfaces that are not selected. Selecting Live Data only for MPLS circuits would populate only MPLS- related data and would not satisfy the requirement for all WAN circuits. Unselecting and reselecting only the INET circuit affects only that one circuit. Therefore, the correct operational step is to enable Live Data for all WAN circuits shown in the branch interface dashboard.
質問 # 58
An SD-WAN branch is deployed behind a NAT device. In the VSM local-tunnel-site output, which field or flag indicates that a WAN link is behind NAT?
正解：C
解説：
The correct answer is A . Versa SD-WAN data-path troubleshooting documentation shows the VSM local- tunnel-site output and includes a legend in which BN means Behind NAT . In the WAN local link details, the output also displays a field named WAN lcl link behind NAT , with values such as 1 or 0, and link flags including [ BN CT PT SLA-P ] when the WAN link is behind NAT.
This information is important because NAT status affects how SD-WAN tunnel endpoints are discovered and how public and private transport addresses are represented. The same output includes both public and private WAN link addresses, making it useful for troubleshooting sites behind NAT, stale tunnel endpoints, or incorrect public-address learning.
WAN lcl vrf-id identifies the local transport routing instance ID, not NAT status. Tenant ID identifies the tenant context. Neighbour site type identifies whether the remote endpoint is a Controller, hub, or SD-WAN site. None of those fields specifically confirms whether the local WAN transport is behind NAT.
質問 # 59
A CGNAT pool shows repeated alloc-failures and increasing free-failures . Which troubleshooting approach is most appropriate?
正解：A
解説：
The correct answer is A . Versa CGNAT troubleshooting documentation provides a clear workflow for CGNAT issues. It first describes how to view CGNAT summary information using show orgs org-services < org > cgnat summary. It then shows how to view per-pool statistics using show orgs org-services < org > cgnat pools < pool-name > statistics. The sample output includes counters such as bindings-allocated , bindings-freed , alloc-failures , free-failures , out-of-address-errors , and out-of-ports-errors .
If these counters indicate failures, the next step is to inspect CGNAT state inside the vsmd daemon, including tenant state, ACL matching, pools, bindings, and source-port resources. This helps determine whether the issue is pool exhaustion, rule mismatch, resource allocation failure, or stale runtime state.
OSPF may affect routing but does not explain CGNAT allocation counters. Analytics may store logs but is not the dataplane authority for NAT allocation. Rebooting Analytics would not resolve CGNAT resource programming on the VOS device.
質問 # 60
You are asked to ensure symmetric traffic flows between two SD-WAN branches. Which feature should be enabled to achieve this objective?
正解：C
解説：
Symmetric Forwarding is the correct Versa SD-WAN feature for ensuring that return traffic between SD- WAN branches follows the same SD-WAN path on which the forward traffic was received. Versa documentation for SD-WAN traffic steering describes Symmetric forwarding as the option that specifies the path for reverse-direction traffic, meaning whether traffic returning from the destination branch to the originating branch should be sent on the same path on which it arrived. It further states that enabling symmetric traffic forwarding determines the reverse path for traffic returning from the destination branch to the originating branch.
This is different from Symmetric Routing, which is a routing design goal or behavior, not the Versa SD- WAN forwarding-profile feature named in the product documentation. Equal-Cost Multipath can distribute flows across equal-cost routes, but it does not specifically guarantee that both directions of the same SD-WAN session use the same path. Packet Striping is used to split or distribute packets across multiple links for performance, not to enforce bidirectional path symmetry. Therefore, the verified Versa feature to enable is Symmetric Forwarding.
質問 # 61
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?
正解：A
解説：
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.
質問 # 62
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