VNX100 Versa Certified SD-WAN Associate Question and Answers

The Versa Stateful Firewall feature encompasses a range of security capabilities, including Unified Threat Management (UTM), which may comprise antivirus, IPS, and web filtering services. It also provides Zone Protection, which enforces security policies based on the zones defined in the network to protect network segments. DDoS protection and DUP are also vital security functions, but they are not specified as capabilities within the Stateful Firewall feature set in the documents provided.

To identify and diagnose intermittent network performance issues that occurred in the past,Versa Analytics dashboards (Answer B)are the most suitable component. Versa Analytics provides deep insights into historical data, enabling network administrators to analyze trends, performance metrics, and potential bottlenecks that occurred previously. The dashboards offer a comprehensive view of the network's operational performance over time, allowing for effective troubleshooting of issues that are not currently manifesting but did impact users in the past.

References:Versa Analytics dashboards are specifically designed to handle retrospective and real-time network data analysis, making them an essential tool for diagnosing past issues as described in Versa's official documentation on network analytics and performance monitoring.

The SLA profile shown in the exhibit appears to be set with thresholds for various metrics such as jitter, packet loss, and latency. These thresholds determine the acceptable performance criteria for the network. The profile is configured with specific maximums for packet loss, both in the forward and reverse directions, and for latency. If any of these configured values are exceeded, the SLA profile is triggered, indicating a breach of the desired service level agreement parameters. Therefore, if the packet loss value exceeds the maximum set in the profile, it will trigger an event or alert, which can then be used for remediation or for activating pre-defined traffic steering rules to maintain application performance.

A Versa Analytics reporting view provides the capability to send reports by email, generate reports periodically, and create custom reports. This means administrators can set up automated report generation to be received at specific intervals, providing insights into the network's performance and security posture. These reports can be tailored to specific needs through custom report creation, ensuring relevant data is highlighted and presented as required.

In a Versa Secure SD-WAN solution configured with a Full Mesh topology, the true statement is that CPE devices send SLA probes on all possible transport paths between devices (B). This approach ensures any-to-any communication among branches, enabling direct communication using overlay tunnels without the need to transit through a hub or centralized site. SLA monitoring probes are utilized to track reachability and to measure link metrics for each access circuit towards any given remote site. These probes are critical for maintaining high-quality communication paths and for implementing traffic steering based on predefined SLA parameters​​.

In a Versa Analytics cluster, the node personalities include Search and Analytics. These personalities reflect the different roles each node in the cluster plays. The Search nodes are responsible for ingesting and indexing data, enabling fast and efficient search operations, while the Analytics nodes are responsible for processing and analyzing data, providing insights and reports. This separation of duties is key to the operation of a Versa Analytics cluster, ensuring optimal performance and reliability of the analytics platform.

Security zones in a Versa Secure SD-WAN solution group interfaces into security domains, controlling how traffic is processed and filtered through the network. These zones play a key role in the segmentation of traffic, improving security posture by enforcing distinct policies for different zones. They do not separate routing information into different routing tables or hide interfaces from tenants in a multi-tenant environment; rather, they are integral in the enforcement of security boundaries within the network.

In a Versa Secure SD-WAN solution, security zones are utilized primarily to group interfaces into security domains and provide segmentation of traffic. This approach enhances the security posture by isolating different types of traffic based on organizational policies or compliance requirements, thereby limiting the spread of threats across zones.

• Security Zones Group Interfaces into Security Domains (Answer A): Security zones in Versa SD-WAN are used to group multiple interfaces (either physical or virtual) into distinct domains. This grouping is strategic for enforcing security policies that are specific to a zone. For instance, a zone could be designated for guest access and have different access restrictions and monitoring compared to an employee zone.
• Security Zones Provide Segmentation of Traffic (Answer B): Traffic segmentation within Versa SD-WAN is achieved through the use of security zones. By segmenting traffic, organizations can enforce security policies tailored to the type of traffic or the sensitivity of the data within each segment. This is crucial for controlling resource access and reducing the potential impact of security breaches.

Security zones do not inherently separate routing information into separate routing tables (Option C), nor are they primarily used to hide interfaces from tenants in a multitenant environment (Option D).

References:This detailed explanation is based on the security management practices and capabilities defined in Versa Secure SD-WAN solutions, as outlined in the Versa Networks Academy Library and supplemented by standard network security principles.

The policy shown in the exhibit appears to match traffic flows based on multiple conditions involving the source zone and the application. Given the information in the screenshot:

• The policy is configured with multiple zones as source zones:Intf-LAN1-ZoneandIntf-WLAN-Zone.
• An application is specified:SHAREPOINT.

The policy is likely to be applied to traffic originating from either of the specified zones and specifically related to the SharePoint application. This implies that both conditions related to the source zones are not mutually exclusive but rather a union; the same goes for the application condition.

Given this interpretation, the correct set of conditions that match the policy shown would be:

B.Traffic flows that meet any of the following two conditions:

• Source Zone - Intf-LAN1 Zone
• Source Zone - Intf-WLAN-Zone

In addition, the below condition must also match:

• Application - SharePoint

This means that traffic will match the policy if it comes from either theIntf-LAN1-Zoneor theIntf-WLAN-Zoneandis SharePoint application traffic.

However, to be more precise in the context of Versa SD-WAN configurations, it's important to note that policies are usually applied when all conditions within a single rule are met. If the configuration in the screenshot intends to express that traffic is matched if it comes from either of the two zones and is for the SharePoint application, then the correct answer should reflect this logic. If the configuration system is set up to require all conditions in a rule to be met, then the answer could potentially be different. Since the user interface design can sometimes vary, it’s important to understand the specific logic of the system in question.

Versa CPEs support a variety of Quality of Service (QoS) functions to ensure effective bandwidth management and priority handling of network traffic. The three functions supported are:

• Hierarchical queuing (Answer B): This QoS function allows for the creation of a multi-level queue structure, enabling more granular control of traffic prioritization and bandwidth allocation among various traffic classes.
• Egress policing (Answer C): This involves setting maximum bandwidth limits for outbound traffic on network interfaces to prevent any traffic class from consuming excessive bandwidth and impacting the performance of other critical applications.
• Classification (Answer D): This is the process of marking packets based on predefined criteria, which can include source or destination IP addresses, ports, or application types. Classification is essential for applying the appropriate QoS policies to different types of traffic.

References:These functionalities are extensively described in Versa’s configuration manuals, where the setup and implications of each QoS feature are discussed, ensuring optimal network performance and adherence to organizational policies.

The provisioning of Versa SD-WAN CPE devices can be accomplished through multiple methods, including:

• URL-based provisioning (Answer B): This method involves directing the CPE to a URL where it can download configuration files automatically. This is an efficient way to provision devices remotely and is widely used for initial device setup and configuration.
• Script-based provisioning (Answer C): This method allows network administrators to use scripts to automate the configuration process of CPEs. Scripts can be customized to apply specific configurations and policies based on the deployment requirements.

References:Both URL-based and script-based provisioning are standard practices detailed in Versa's deployment guides, which provide step-by-step instructions on using these methods for efficient and scalable CPE deployments.

When a CPE device appears in the unknown device list in Versa Director Inventory during Zero Touch Provisioning (ZTP), it typically indicates a discrepancy in device identification details. Specifically,the device workflow configuration not having the correct serial number of the CPE defined (Answer C)can lead to this issue. The workflow configuration must accurately include the serial number so that Versa Director can recognize and authenticate the device as part of the organization’s network infrastructure. If the serial number in the workflow configuration does not match the serial number of the actual device, the Director will not be able to properly identify and classify the device, thus placing it in the unknown device list.

References:Versa’s official documentation on ZTP outlines the importance of accurate device identifiers in the workflow configuration to ensure successful device onboarding and recognition by the Versa Director.

In the context of Versa SD-WAN, Class of Service (CoS) refers to mechanisms within the network that manage traffic prioritization and resource allocation. CoS is essential for ensuring that critical business applications receive the necessary bandwidth and low-latency treatment they require to function effectively.

A.Remarking: Remarking is a process that manipulates the Class of Service bits (in the IP header's DSCP field) or Layer 2 CoS fields (in the VLAN tag's priority code point - PCP). By remarking these fields based on Layer 3 (IP), Layer 4 (TCP/UDP ports), and Layer 7 (application identification) details, the network can differentiate and prioritize traffic. This ensures that critical applications, such as voice and video, are given higher priority over less time-sensitive data.

C.Queuing: Queuing mechanisms within Versa SD-WAN determine how packets are treated as they are processed through the network. Various queues can be assigned different priorities and weights to control the order in which packets are sent out through the network interface. High-priority queues might be reserved for voice traffic to reduce latency, while lower-priority queues could be used for bulk data transfers that are less sensitive to delays.

The diagram in the exhibit illustrates a hub and spoke topology where the spokes connect through a central hub. This is evident from the dashed lines that show the data flow between the spokes is mediated by the hub (Hub1). In this topology, while the spokes may have direct connections, the data flows between them pass through the hub. This kind of topology is commonly used in SD-WAN deployments to simplify routing and policy enforcement, which are managed centrally at the hub, as opposed to setting up direct paths between all spoke sites, which would be indicative of a full mesh or spoke-to-spoke direct topology.

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Service templates are used to apply an identical QoS configuration to multiple CPEs, ensuring consistent quality of service across the network. Additionally, these templates are also employed to share an identical service configuration across different tenants within a multi-tenant architecture, ensuring uniform policy application while maintaining tenant separation.

The Versa Operating System (VOSTM) is the software platform that provides routing, advanced SD-WAN, and SD-Security in a single software package. The VOS software is deployed in the branch, hub, cloud, and data center. Specifically, it is utilized within the Versa Controller, the Versa SD-WAN CPE, and the Versa SD-WAN Gateway, which are the components that use VOS to deliver their networking and security functions. Versa Director, on the other hand, is a centralized provisioning and management application that manages the VOS software instances but does not run the VOS itself. Versa Analytics is an analytics engine that provides insights into network traffic and events and also does not run the VOS itself.​