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| Section | Weight | Objectives |
|---|---|---|
| Management & Orchestration | 15% | - Versa Director configuration and workflows - Zero-touch provisioning (ZTP) - Device provisioning and templates - Service chaining |
| SD-WAN Fundamentals | 15% | - Transport independence - SLA-based routing principles - Underlay vs overlay networking - WAN virtualization concepts |
| Monitoring & Troubleshooting | 10% | - Common troubleshooting scenarios - Versa Analytics dashboards - SLA monitoring and reporting - Log analysis and debugging |
| Security Services | 15% | - Integrated firewall capabilities - ZTNA / micro-segmentation - Threat protection and IPS/IDS - URL filtering and DNS security |
| Versa SD-WAN Architecture & Components | 20% | - Branch CPE deployment modes - Versa Operating System (VOS) architecture - Controller architecture (Versa Director, Analytics) - Device roles: Controller, CPE, Analytics |
| Versa FlexVNF Features & Configuration | 25% | - Traffic steering and path selection - Application-aware routing - QoS and traffic shaping - WAN interface configuration and bonding - In-band network telemetry |
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55. Frage
A branch using DIA with CGNAT reports that new internet sessions intermittently fail. CGNAT pool counters show increasing out-of-ports errors, while out-of-address errors remain zero. What is the most likely problem?
Antwort: B
Begründung:
The correct answer is A . Versa CGNAT troubleshooting documentation includes per-pool and resource counters that show allocation behavior and failures. The counters include values such as bindings allocated, bindings freed, allocation failures, out-of-address errors, and out-of-ports errors. It also shows that CGNAT source-port resources are divided and distributed to worker threads by Versa RFD/RFM, and that allocated source-port ranges can be viewed using show rfm table src-port allocated.
If out-of-ports errors increase while out-of-address errors remain zero, the pool still has usable translated IP addresses, but the available port resource for NAT bindings is exhausted. This commonly occurs when too many concurrent sessions share a limited public IP or source-port range. The corrective action would be to expand the NAT resource, add more public translated IPs, adjust port allocation, or reduce excessive session usage.
A missing NAT IP pool would more likely produce out-of-address problems. A wrong zone match might prevent translation entirely, and OSPF in the LAN VR is unrelated to CGNAT port-resource exhaustion.
56. Frage
A branch user reports poor throughput over an SD-WAN tunnel. The command show interfaces detail vni-0/0 shows the interface is operating at half-duplex / 100 Mbps , although the circuit is expected to run at 1 Gbps full duplex. What is the most likely cause?
Antwort: B
Begründung:
The correct answer is C . Versa's bandwidth and throughput troubleshooting documentation specifically instructs administrators to check link speed and half-duplex conditions with the command show interfaces detail interface-name. The example output shows an interface operating at half-duplex / 100 Mbps , and the documentation states that the interface should not be in half-duplex mode and that 100 Mbps was incorrect in that scenario.
A duplex mismatch or incorrect negotiated speed can severely reduce effective throughput, cause collisions or retransmissions, and make SD-WAN overlay performance appear poor even when the overlay itself is functioning. Versa recommends fixing half-duplex and link-speed issues by correcting the configuration on the device to which the VOS device is connected and checking the ISP-side transmission mode, such as auto
/auto.
SLA probing, Controller route advertisement, and VXLAN encapsulation may affect SD-WAN path selection or tunnel formation, but the evidence in the question directly points to a physical or underlay Ethernet negotiation problem.
57. Frage
While troubleshooting the SD-WAN data path, you run show vsf tunnel access-circuits ... detail and see the following encapsulation chain: VMLH, MPLS-over-GRE, IPsec-ESP, and VXLAN. What does this output primarily confirm?
Antwort: C
Begründung:
The correct answer is B . Versa's SD-WAN data-path troubleshooting documentation shows that show vsf tunnel access-circuits ... detail can display the access-circuit state and encapsulation chain used for tunnel forwarding. In the example, the output lists multiple encapsulations, including VMLH , MPLS-over-GRE , IPsec-ESP , and VXLAN . It also shows transport details such as source IP, destination IP, UDP transport, tunnel MTU, SPI values, and SLA state.
This confirms that the VOS data plane has built the SD-WAN tunnel encapsulation stack required to forward overlay traffic across the underlay. IPsec-ESP in the chain indicates encrypted tunnel handling, while VXLAN and other encapsulation components are part of the SD-WAN overlay forwarding structure.
The output does not indicate simple bridging, plain-text-only GRE, or bypass of the VOS data plane.
Instead, it proves that the packet path is being processed through the VOS tunnel forwarding framework and that the administrator is looking at the SD-WAN access-circuit tunnel state.
58. Frage
Examine the exhibit below.
Spoke1 and Spoke2 are part of Spoke-to-Hub-Only spoke group, the hub is advertising a default route to both the spokes.
Referring to the exhibit, which statement is true?
Antwort: B
Begründung:
In Versa SD-WAN, a Spoke-to-Hub-Only topology is specifically designed for deployments where spoke branches communicate only with hub resources and not with other spokes. Versa's SD-WAN design documentation states that in a spoke-to-hub-only topology, the default behavior is that only hub routes are advertised, and spoke routes are not re-advertised by the hub branch. It also explains that this topology is used when spokes do not have to communicate with each other.
Even though the hub in the exhibit advertises a default route, that does not change the topology behavior into spoke-to-spoke communication. The default route can attract unknown traffic from the spokes toward the hub, but the Spoke-to-Hub-Only policy prevents the spoke prefixes from being redistributed or imported in a way that allows spoke-to-spoke reachability. Versa documentation further shows that spoke routes are filtered using BGP communities and import policies, and that the spoke route table contains only destinations behind the hubs, not other spoke routes.
59. Frage
You configured Direct Internet Access on your Versa branches using the workflow template. Which statement is true in this scenario?
Antwort: B
Begründung:
The correct answer is C . In Versa Secure SD-WAN, Direct Internet Access, or DIA, provides local internet breakout from the branch rather than backhauling internet-bound traffic through a hub. Versa design documentation explains that the DIA architecture creates an internal connection between the tenant VRF and the WAN transport VR and uses CGNAT to translate internet-bound LAN traffic to the public IP address associated with the WAN transport interface. It specifically states that the main DIA components include the CGNAT function for translating internet-bound traffic and that DIA is configured using Director Workflows when configuring tunnels.
When the workflow template is used and the DIA option is selected for the internet breakout tunnel, Director automatically builds the required DIA infrastructure, including the NAPT/CGNAT configuration associated with the internet-facing transport network. This is why manual creation of the CGNAT pool and rule is not required in the workflow-based method. Option A describes a manual configuration approach, not the workflow-generated behavior. Option B is incorrect because NAT must be associated with the internet-facing breakout path, not simply the LAN interface. Option D is incorrect because DIA normally requires address translation for LAN users accessing the public internet.
60. Frage
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