サンプル問題 1： You are asked to ensure symmetric traffic flows between two SD-WAN branches. Which feature should be enabled to achieve this objective?
A: Symmetric Forwarding
B: Symmetric Routing
C: Equal-Cost Multipath
D: Packet Striping
正解：A
Explanation: 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
サンプル問題 2： You are configuring the BGP routing protocol between a Versa Secure SD-WAN CPE with AS number 64514 and two upstream service providers: SP1 with AS number 64515 and SP2 with AS number 64519. You want to prefer BGP routes learned from AS 64515 over routes learned from AS 64519. Which BGP path attribute would be used to accomplish this task?
A: The BGP MULTI_EXIT_DISC path attribute
B: The BGP ORIGIN path attribute
C: The BGP LOCAL_PREF path attribute
D: The BGP NEXT_HOP path attribute
正解：C
Explanation: The correct answer is LOCAL_PREF. In BGP, the Local Preference attribute is used inside an autonomous system to influence which exit path is preferred for outbound traffic. In this scenario, the Versa Secure SD-WAN CPE receives routes from two upstream service providers, SP1 and SP2. To prefer routes learned from AS 64515 over routes learned from AS 64519, you would apply a BGP import or route policy that assigns a higher local preference to routes received from SP1. Versa SD-WAN design guidance shows this exact routing concept: an import policy can manipulate the Local-Pref attribute to prefer one advertised route path over another. The Versa output examples also display “Local Preference” as a BGP route attribute used in route selection. MULTI_EXIT_DISC, or MED, is generally used to influence how a neighboring AS enters your AS, not how your CPE prefers routes learned from different upstreams. ORIGIN is part of BGP best-path selection but is not normally the administrative tool used to prefer one provider. NEXT_HOP identifies the next-hop address and does not directly define route preference.
サンプル問題 3： As an administrator, you are migrating your legacy WAN to Versa Secure SD-WAN without changing the underlay network. You need to ensure that, during the migration process, legacy WAN sites are allowed to communicate with SD-WAN branches. Which two steps should be implemented to accomplish this task? (Choose two.)
A: Apply the Spoke-to-Spoke-Direct topology for the SD-WAN branches.
B: Using workflows, configure the Gateway option in the hub template for the underlay links.
C: Configure BGP on the hub underlay links to advertise and receive the prefixes.
D: Configure an SD-WAN traffic steering policy to advertise the SD-WAN routes.
正解：B, C
Explanation: The correct answers are B and C. During a migration from a legacy WAN, such as MPLS Layer 3 VPN, to Versa Secure SD-WAN, an SD-WAN gateway is used to allow communication between SD-WAN-enabled branches and legacy WAN sites. Versa SD-WAN design guidance states that an SD-WAN gateway allows sites connected to the SD-WAN VPN network to communicate with sites connected to a legacy MPLS VPN network. It also explains that this gateway facilitates route exchange between the MPLS underlay network and the SD-WAN VPN network, typically using a dynamic routing protocol such as BGP. For this design, the hub or gateway must be configured with the Gateway option for the underlay transport so it can act as the interconnect point between the legacy and SD-WAN domains. Versa documentation further describes configuring a BGP peering session on the MPLS transport VR of the gateway to exchange routes from the MPLS provider to the SD-WAN network, and notes that Director Workflows can automate this configuration. Spoke-to-Spoke-Direct is not sufficient for legacy interconnect, and SD-WAN traffic steering policies do not advertise routes.
