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| Section | Objectives |
|---|---|
| Security and Encryption | - Encryption and certificate management - Firewall policies and security services |
| Deployment and Provisioning | - Branch and edge deployment models - ZTP and onboarding workflows |
| Monitoring, Analytics and Troubleshooting | - Versa Analytics dashboards - Troubleshooting SD-WAN performance issues |
| High Availability and Redundancy | - HA active-active and failover design - Redundant gateway and link resiliency |
| Policy-Based Routing and Traffic Steering | - Path selection and SLA-based steering - Application-aware routing policies |
| QoS and Performance Optimization | - QoS/CoS configuration - Latency, jitter, and bandwidth optimization |
| SD-WAN Fundamentals and Architecture | - Underlay and overlay network design - SD-WAN principles and architecture concepts |
| Versa SD-WAN Platform Components | - VOS components and CPE devices - Versa Controller, Director, Analytics roles |
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問題 #19
You are onboarding a branch with one WAN and one LAN interface. After a successful branch activation, the branch is not able to reach the Versa Controller. You realize that the WAN gateway IP address originally entered under the Device Bind Data menu in Versa Director is incorrect. Which action will you perform to solve the problem?
答案：A
解題說明：
The correct action is to update the WAN gateway IP address in Device Bind Data and onboard the branch appliance again. Device Bind Data supplies site-specific values, such as WAN interface addressing and gateway information, that are merged with the workflow and template configuration during onboarding. If the wrong WAN gateway is entered, the branch may activate successfully from a workflow perspective, but the resulting WAN routing configuration is incorrect. As a result, the branch cannot establish proper transport reachability to the Controller. Versa troubleshooting documentation explains that, after establishing transport connectivity from a branch to a Controller, at least one WAN interface must be available, and the branch then establishes IKE-based IPsec connectivity to the Controller. If that IKE/IPsec connectivity fails, the Controller- facing ptvi interface remains down.
Changing the configuration only from the Appliance context is not the best answer because the incorrect value originated in the bind-data source used for provisioning. Modifying it manually from the branch CLI is also not recommended because the device is managed by Versa Director and template-driven configuration. Resetting the device does not automatically discover or "ping" the correct gateway. The correct remediation is to fix the bind data and repeat onboarding so the branch receives the correct generated configuration.
問題 #20
You configured a Versa speed-test server on a VOS device, but the client cannot start the bandwidth test. A firewall exists between the client and server. Which port must be allowed through the firewall?
答案：A
解題說明：
The correct answer is A . Versa link-bandwidth troubleshooting documentation explains that a VOS device can be configured as a Versa speed-test client, a Versa speed-test server, or both simultaneously. After the server is configured, the client starts the test by initiating a TCP-based connection toward the speed-test server. The server listens on port 5201 . The documentation includes an explicit note that if the VOS device is behind a firewall, port 5201 must be open .
This is different from the SD-WAN overlay data path, which commonly uses UDP-based transport encapsulation, and different from internet speed-test traffic, which uses other ports depending on the specific test type. In this scenario, the question states that a Versa speed-test server was configured, so the relevant requirement is TCP 5201 reachability from the client to the server.
TCP 443 may be used for management or web access, UDP 4790 is associated with SD-WAN transport encapsulation, and UDP 53 is DNS. None of those replace TCP 5201 for Versa speed-test server operation.
問題 #21
Examine the exhibit below.
You are configuring Class of Service on a WAN-facing network interface, and you want to perform DSCP rewrite on the packets that are forwarded to the WAN.
However, you are not able to turn on DSCP rewrite.
Referring to the exhibit, what is the cause of this issue?
答案：C
解題說明：
In the exhibit, the Add Associate Interface/Network window has Interface selected, and the interface name is set to vni-0/0 . The DSCP rewrite option is not available because rewrite behavior is intended to be applied at the network association level for the WAN network, not directly while associating only the physical
/logical interface. For WAN-facing CoS, the scheduler and shaping parameters can be attached to an interface, but DSCP rewrite policies are applied to remark traffic as it exits through a network context.
Versa SD-WAN design documentation explains that QoS rewrite rules rewrite packet QoS attributes as packets leave the VOS device, and that rewrite rules can modify IEEE 802.1p bits, IPv4 TOS/DSCP bits, and IPv6 traffic class bits. It also explains that a rewrite policy is commonly applied on a WAN network to remark traffic based on the forwarding class and loss priority assigned by QoS or App QoS policies. In the design example, Versa explicitly describes applying a QoS propagation or rewrite policy on the MPLS WAN network to remark traffic to a DSCP value. Therefore, the issue is the association type: it is set to Interface, not Network.
問題 #22
You want to test a WAN circuit in a way that more closely simulates a single SCP or FTP file transfer. Which method should you use?
答案：D
解題說明：
The correct answer is B . Versa documentation for internet speed tests explains that when you run an internet speed test from a Director node, it creates approximately 200 sessions . This is useful for measuring aggregate throughput, but it does not represent the behavior of a single application flow. The same documentation states that you can run a speed test with a single session from the device CLI, and that this is useful for simulating file transfer rates when using SCP or FTP .
Therefore, when the goal is to understand how a single file transfer behaves, the CLI-based single-session test is the best option. A default Director-based test may produce higher aggregate results because multiple sessions can use parallelism and better fill the pipe.
show interfaces brief is useful for interface status and addressing, but it does not measure file-transfer throughput. SLA latency is useful for path-quality monitoring, but latency alone does not show single- session TCP throughput.
問題 #23
A branch has Direct Internet Access enabled. Users can resolve DNS, but application traffic fails. You find that the internet speed test also fails to fetch the server list. Which two configurations should be checked first?
答案：C
解題說明：
The correct answer is A . Versa documentation for internet speed tests states that before running an internet speed test, administrators must verify WAN internet connectivity and verify that CGNAT is configured on the provider organization. It also states that administrators should verify that they can retrieve the list of predeployed internet speed-test servers. If an error occurs while fetching the server list, the documentation instructs administrators to check the CGNAT and DNS configurations and then click Fetch Server List again.
This aligns with the scenario because DNS resolution and internet breakout depend on correct DNS reachability, NAT translation, and routing through the internet-facing transport. Even if DNS appears partially functional, CGNAT misconfiguration can still prevent application or HTTP test traffic from completing properly.
OSPF, BGP MED, SNMP, syslog, VRRP, and DHCP may be important in other designs, but they are not the first items Versa identifies for a failed internet speed-test server-list fetch in a DIA context.
問題 #24
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