Free Cisco Implementing Cisco Catalyst SD-WAN Solutions 300-415 Exam Questions

To assign community tags to 3 critical server networks for BGP advertisement while preventing them from being advertised outside AS (Autonomous System), the configuration must:

• Create Route Policies: Define route policies that match the 3 critical server networks
• Assign Community Tags: Set BGP community tags on these routes using the route policy
• Apply Export Policy: Use an export route policy to prevent these routes from leaving the AS by either not advertising to external peers or by filtering based on the community tags
• Match Prefixes: Create a match clause that identifies the 3 server network prefixes (or their supernets)
• Set Community Values: Apply appropriate BGP community values that identify these as internal-only routes

The correct configuration would show:

• A route policy matching the 3 specific IPv4 prefixes
• A set clause assigning one or more BGP community tags
• An export policy that references these communities and restricts advertisement to external BGP peers

Without the specific options shown, this describes the structure needed to tag and locally contain the critical server networks within the AS.

To configure DIA (Direct Internet Access) on multiple branches with a common location ID format like A041:B70C:D78E::18, the WAN Edge configuration must:

• Support the location ID format syntax (appears to be a hexadecimal identifier)
• Enable DIA on the branch routers
• Use a consistent location ID across multiple branches for policy application

The location ID is typically configured in the Device template under system settings. Look for the option that shows the location ID configured in the exact format provided and applied to the branch interfaces where DIA should be enabled.

The requirement for integrating a Secure Internet Gateway (SIG) with a Cisco SD-WAN Edge device is:

• The SIG must be accessible via the DIA (Direct Internet Access) path from the SD-WAN Edge device
• The SD-WAN Edge router must have direct connectivity to the SIG, typically through an internet-facing interface
• SD-WAN policies must be configured to redirect traffic destined for the internet through the SIG
• The SIG provides advanced threat protection, malware detection, and URL filtering for internet-bound traffic
• A secure tunnel or direct path is required between the edge device and the SIG infrastructure

This integration ensures all internet-bound traffic is inspected by the SIG before reaching external networks, providing an additional security layer.

When routing information of WAN Edge routers is learned from local sites and local routing protocols, the routes are similar to OMP routes (Overlay Management Protocol routes) or connected routes. However, in the SD-WAN context, these are specifically called OMP routes because they are advertised through OMP to other WAN Edge devices and the control plane, distinct from standard IP route advertisements in traditional networks.

An Application Route Policy is configured under Configuration > Policies to implement application-aware routing. This policy type allows administrators to:

• Define routing decisions based on specific applications rather than just destination IP addresses.
• Route certain applications through preferred paths or tunnels.
• Direct high-priority business applications through optimized paths while routing other traffic differently.
• Improve application performance by ensuring traffic takes optimal paths based on application requirements.

This enables fine-grained control over how different applications traverse the SD-WAN fabric.

When vManage and vSmart have problems establishing a connection to vBond, the most common issue is missing or invalid certificate trust. The fix requires importing the vBond certificate into both vManage and vSmart systems. This establishes the proper PKI chain and allows them to authenticate and communicate with vBond. Without the vBond certificate properly imported, the control plane components cannot establish secure connections.

The Control Plane assists in the automatic onboarding of SD-WAN routers into the SD-WAN overlay. The control plane, consisting of vBond (orchestrator), vSmart (controller), and vManage (management), handles the authentication, device enrollment, and distribution of policies and routes needed to bring WAN Edge devices into the fabric. This automated onboarding process is a key differentiator of SD-WAN compared to traditional networking.

Data policies for IPv4 prefixes on WAN edge devices are typically configured through the vManage policy configuration wizard. The general process involves:

• Accessing the vManage dashboard and navigating to Configure > Policies
• Selecting 'Add Policy' to create a new data policy
• Using the policy wizard to define the IPv4 prefix criteria
• Specifying match conditions (source/destination prefixes) and actions
• Assigning the policy to the appropriate site or devices

The specific method depends on whether you're using route-based, policy-based, or traffic-engineered policies. Without the full question options, review your vManage version's policy configuration workflow.

The SNMPv3 snmp user command on a Cisco WAN Edge router supports a maximum of 64 characters for the username. This character limit is important when configuring SNMPv3 authentication credentials, as usernames exceeding this length will be rejected or truncated, potentially causing configuration errors or monitoring connectivity issues.

The Session Traversal Utilities for NAT (STUN) server provided by the vBond orchestrator serves the following role:

• NAT Traversal: Helps WAN Edge routers behind NAT/PAT devices discover their public IP addresses and ports
• Control Plane Connectivity: Enables devices behind firewalls and NAT to establish control plane connections to the vBond controller
• IPsec Tunnel Establishment: Facilitates the setup of IPsec tunnels by allowing devices to determine their external IP addresses for tunnel endpoints
• The STUN server responds to STUN queries from WAN Edge devices, allowing them to learn their publicly routable addresses even when behind NAT devices
• This is critical for SD-WAN deployment in environments where branch routers are behind residential or corporate NAT/PAT devices

The vBond component of the Cisco SD-WAN control plane architecture should be located in public Internet address space and facilitates NAT-traversal.

• vBond location: Must be publicly reachable and located in Internet-routable address space.
• NAT-traversal role: vBond orchestrates the initial DTLS connections from vEdge devices, helping them traverse NAT and firewalls.
• Bootstrap function: vEdge devices connect to vBond first to discover vSmart and vManage controllers.
• vBond uses STUN/TURN techniques to help devices establish connections across NAT boundaries.

This architecture ensures that branch devices behind NATs can successfully establish connections to the control plane infrastructure, enabling the SD-WAN fabric to function across diverse network topologies.