SD-WAN-Engineer Exam Dumps - Palo Alto Networks SD-WAN Engineer

Comprehensive and Detailed Explanation

Site Templates(often referred to as Site Configuration Templates) are a critical tool for the Zero Touch Provisioning (ZTP) of large-scale deployments in Prisma SD-WAN.

1. Device Pre-staging (Statement C):

One of the primary capabilities of Site Templates is the creation of Device Shells. A device shell is a configuration container that exists in the controller before the physical hardware is installed or connected. By using a template, an administrator can pre-provision the entire configuration (interfaces, routing, subnets) for the "Site" and "Element" (Device). When the physical ION device is later connected to the internet and claimed (associated with the shell via its Serial Number), it immediately inherits this pre-staged configuration, enabling a true "plug-and-play" deployment.

2. Mandatory Variables (Statement B):

To successfully instantiate a functional site from a generic template, specific unique identifiers are required in the variable data set (typically a CSV file).

Site Name:Identifies the location in the portal.

ION Software Version:Ensures the device boots to the specific validated code version required for the deployment, preventing inconsistencies.

ION Serial Number / Device Name:Required to bind the logical configuration (Shell) to the physical hardware. Even if the serial is added later during the claim process, thestructureof the template and the deployment workflow mandates these variables to ensure the device can be uniquely identified and managed within the fabric.

Note on Option D:While it is technically possible to re-deploy a template, theBest Practicefor "Day 2" operations (updating or modifying configuration after deployment) is to usePrisma SD-WAN Stacks(Network Stacks, Security Stacks, etc.). Stacks allow for granular, policy-based updates across multiple sites without the destructive or rigid nature of re-applying a full site initialization template. Therefore, D is not the aligned best practice.

Comprehensive and Detailed Explanation

To diagnose specific VPN negotiation failures (Phase 1 or Phase 2 IPSec issues), theEvent Logs(specifically filtered forSystemorVPNevents) are the correct resource.

Event Logs:This section records the control plane signaling messages. If a VPN tunnel fails to establish, the Event Log will generate an entry containing the specific IKE failure reason sent by the peer or generated locally. Common errors found here include INVALID_COOKIE, NO_PROPOSAL_CHOSEN (mismatch in encryption algorithms), or PRE_SHARED_KEY_MISMATCH.

Flow Browser (A):This showsuser traffic(TCP/UDP sessions). If the VPN is down, user traffic won't even enter the tunnel, so the Flow Browser will just show dropped flows or blackholes, but it won't explainwhythe tunnel itself is broken.

Link Quality (D):This shows latency/loss graphs forestablishedtunnels. It cannot diagnose why a tunnel failed to form in the first place.

Comprehensive and Detailed Explanation

Prisma Access managesRemote Networkbandwidth using anAggregate Bandwidthlicensing model.

Compute Locations:When you purchase bandwidth (e.g., 1 Gbps), you allocate it to specific Prisma AccessCompute Locations(e.g., US West, Europe Central).

Shared Pool:All branch sites (Remote Networks) that connect to that specific Compute Location share the allocated bandwidth pool. For example, if you allocate 500 Mbps to "US West" and connect 10 branches to it, they compete for that 500 Mbps aggregate.

Bursting:An individual branch isnotstrictly rate-limited to a "slice" (e.g., 50 Mbps) unless you explicitly configure QoS guarantees. By default, a single branch can burst and consume a large portion of the aggregate pool if other branches are idle. The enforcement happens at the Region/Compute Node level, ensuring the total throughput does not exceed the licensed capacity for that region.

Comprehensive and Detailed Explanation

To defend against volumetric attacks such asTCP SYN Floods, UDP Floods, or ICMP Floods, Prisma SD-WAN (like PAN-OS) utilizesZone Protection Profiles.

Function:A Zone Protection Profile is a specific security object designed to screen traffic for protocol anomalies and flood behaviors before it is processed by the complex firewall policy engine. It sets thresholds (e.g., "Max 1000 SYNs/sec"). If the traffic rate exceeds this threshold, the system triggers an action (Alarm, Drop, or SYN Cookies) to protect the device's resources.

Application:Unlike a standardZBFW Rule(A) which filters based on Source/Destination/App-ID (which might still allow the initial handshake packets that cause the flood), a Zone Protection Profile is applied to theZoneobject itself (in this case, theLAN Zone). This ensures that the flood is mitigated at the ingress stage, preventing the ION's session table and CPU from being exhausted by the attack.

Comprehensive and Detailed Explanation

TheSelf-Zoneis a predefined security zone in the Prisma SD-WAN ZBFW that represents the ION device's own control plane and management traffic.

Default Rule:The security policy contains an implicit, uneditable default rule thatAllowstraffic originating from theSelf-Zoneto any destination zone (Internet, Private WAN, etc.).

Rationale:This ensures that the device can always perform essential critical functions—such as connecting to the Cloud Controller, resolving DNS, syncing time via NTP, and establishing VPN tunnels—without the administrator needing to manually create "Allow" rules for the device itself. If this traffic were blocked by a "Deny All" default, the device would become unmanageable (bricked) immediately after applying the policy.