View Full Palo Alto Networks SD-WAN-Engineer Exam Dumps and Practice Test Dumps.

 

Question 301

Which routing protocol is commonly used to exchange routes between autonomous systems?

1. OSPF
2. BGP
3. DHCP
4. DNS

Correct Answer: 2

Explanation

BGP is a routing protocol designed primarily for exchanging routing information between autonomous systems. It uses path attributes and policy controls to influence route selection and propagation. OSPF, in contrast, is an interior gateway protocol commonly used within a routing domain. DHCP provides address configuration, while DNS provides name resolution. In SD-WAN environments, understanding BGP is important when troubleshooting reachability between sites or external networks because routing decisions can affect which destinations are available before SD-WAN path policies determine suitable forwarding behavior. Administrators should examine BGP neighbors, advertisements, attributes, and resulting routes when diagnosing BGP-related issues.

Question 302

What is required for two BGP routers to exchange routing information?

1. A BGP neighbor relationship
2. A DNS cache
3. A QoS class
4. A DHCP relay

Correct Answer: 1

Explanation

A BGP neighbor relationship is required for two BGP routers to exchange routing information. The relationship establishes the communication session through which routing updates and relevant path information are exchanged. If the BGP session is not established, routes cannot be learned through that neighbor. Administrators troubleshooting BGP should verify peer addresses, reachability, autonomous system information, authentication where applicable, and session state. DNS caching and DHCP relay serve different network functions, while QoS classes affect traffic treatment rather than creating routing relationships. A healthy BGP session is therefore a fundamental prerequisite for dynamic route exchange.

Question 303

Which routing protocol uses a link-state database to calculate routes?

1. BGP
2. DHCP
3. OSPF
4. NAT

Correct Answer: 3

Explanation

OSPF is a link-state routing protocol that maintains information about the topology of its routing area and uses that information to calculate routes. Routers exchange link-state information and use the resulting database to determine appropriate paths toward destinations. BGP uses a different path-vector approach, while DHCP and NAT are not routing protocols. Understanding OSPF’s link-state behavior is useful when troubleshooting dynamic routing because adjacency problems or incomplete topology information can prevent expected routes from appearing. Administrators should review neighbor state, area configuration, interface participation, and routing information when OSPF behavior is unexpected.

Question 304

An OSPF route is missing from the routing table. What should be checked?

1. Monitor brightness
2. OSPF adjacency and route advertisement
3. Browser settings
4. Keyboard language

Correct Answer: 2

Explanation

OSPF adjacency and route advertisement should be checked when an expected OSPF route is missing from the routing table. If the relevant neighbor relationship is not established, routing information may not be exchanged. Administrators should also verify interface participation, area configuration, network reachability, and whether the expected prefix is actually being advertised. Browser settings, monitor brightness, and keyboard language have no impact on OSPF operation. After confirming adjacency and advertisements, the administrator should inspect the routing table and determine whether another route or routing policy is influencing the final selected path.

Question 305

What is the purpose of route redistribution?

1. To exchange routes between different routing sources
2. To measure packet jitter
3. To create VLANs
4. To classify applications

Correct Answer: 1

Explanation

Route redistribution allows routing information learned from one routing source or protocol to be introduced into another routing domain or protocol. This can be useful when an environment uses multiple routing protocols or when routes from different sources need to be shared. Redistribution should be carefully controlled because unrestricted exchange can introduce unwanted prefixes, routing loops, or unexpected path selection. Packet jitter measurement, VLAN creation, and application classification are separate functions. Administrators should define appropriate redistribution policies and filtering so that only the intended routes are exchanged between routing domains.

Question 306

Which control helps prevent unnecessary routes from being propagated during redistribution?

1. Route filtering
2. DNS caching
3. QoS marking
4. DHCP leasing

Correct Answer: 1

Explanation

Route filtering helps prevent unnecessary or unwanted routes from being propagated during redistribution. By controlling which prefixes are accepted or advertised, administrators can restrict routing information to the destinations required by the network design. This reduces the possibility of unintended routes influencing forwarding decisions or creating routing instability. DNS caching, QoS marking, and DHCP leasing perform different functions and do not control route propagation. When implementing route redistribution, administrators should combine appropriate filtering with clear routing policies and then verify both advertised routes and the resulting routing tables to ensure the intended prefixes are exchanged.

Question 307

What can happen if a route is redistributed without appropriate filtering?

1. All traffic becomes encrypted
2. Unintended prefixes may be propagated
3. DNS automatically stops working
4. WAN bandwidth doubles

Correct Answer: 2

Explanation

If a route is redistributed without appropriate filtering, unintended prefixes may be propagated into another routing domain. Those routes can influence forwarding decisions at remote devices and may create unexpected traffic paths, excessive routing information, or even routing loops depending on the topology. Redistribution should therefore be designed carefully, with explicit control over which prefixes are accepted and advertised. Encryption, DNS behavior, and WAN bandwidth are not automatically changed by route redistribution. Administrators should inspect routing advertisements and tables after implementing redistribution to confirm that only the intended destinations are being exchanged.

Question 308

Which BGP characteristic can influence route selection when multiple routes reach the same destination?

1. Path attributes
2. VLAN names
3. DHCP lease duration
4. DNS record type

Correct Answer: 1

Explanation

BGP path attributes can influence route selection when multiple BGP routes are available for the same destination. These attributes provide information that the BGP decision process can use to determine which route should be preferred according to protocol behavior and configured policies. VLAN names, DHCP lease duration, and DNS record types do not determine BGP route selection. Administrators troubleshooting unexpected BGP decisions should inspect the available paths, relevant attributes, local policy, and resulting route selection. Understanding the decision process is especially important when multiple providers or routing sources advertise overlapping destination prefixes.

Question 309

Why is BGP route filtering useful in an enterprise SD-WAN environment?

1. It controls which routes are accepted or advertised
2. It increases physical circuit speed
3. It changes application definitions
4. It disables NAT

Correct Answer: 1

Explanation

BGP route filtering controls which routes are accepted or advertised, helping administrators maintain predictable routing behavior in an enterprise SD-WAN environment. Filtering can prevent unnecessary prefixes from entering a routing table or being propagated to other peers. This is particularly useful when multiple sites, providers, or routing domains exchange information. Route filtering does not increase physical circuit speed, modify application definitions, or disable NAT. Administrators should align filters with the intended network topology and verify the resulting BGP advertisements and routing table entries so that required destinations remain reachable without exposing unnecessary routes.

Question 310

What should be investigated if a BGP neighbor remains down?

1. Application icons
2. Monitor settings
3. Peer reachability and BGP configuration
4. Keyboard shortcuts

Correct Answer: 3

Explanation

Peer reachability and BGP configuration should be investigated when a BGP neighbor remains down. Administrators should verify that the peer address is reachable, the required interfaces and routes are operational, and the BGP configuration contains matching information such as autonomous system parameters and relevant session settings. Depending on the deployment, authentication or transport requirements may also need verification. Monitor settings, keyboard shortcuts, and application icons are unrelated. Troubleshooting should begin with basic connectivity and then progress toward BGP session parameters so that an underlying reachability problem is not mistaken for a protocol configuration problem.

Question 311

Which routing information is most directly used to determine where a destination IP packet should be forwarded?

1. Routing table
2. DNS cache
3. QoS class
4. Application icon

Correct Answer: 1

Explanation

The routing table contains the network-layer information used to determine an appropriate forwarding path for a destination IP address. Entries identify destination prefixes and associated next hops or interfaces, allowing the device to determine where traffic should be sent. DNS resolves names to addresses but does not directly perform packet forwarding, while QoS classes influence traffic treatment rather than basic route lookup. Administrators troubleshooting unexpected forwarding should inspect the routing table and determine which route matches the destination. They should also consider whether SD-WAN policy, NAT, or security processing affects the final traffic behavior.

Question 312

A destination has both a specific route and a broader route. Which route is generally preferred during route lookup?

1. The broader route
2. The route with the older timestamp
3. The most specific matching route
4. The route with the longest hostname

Correct Answer: 3

Explanation

When multiple routes match a destination, the most specific matching route is generally preferred during IP route lookup. This principle is commonly described as longest-prefix matching because a route with more matching network bits represents a narrower destination range. A broader route can still be used for destinations that do not match the more specific prefix. Hostnames and timestamps do not determine prefix specificity. Administrators troubleshooting unexpected forwarding should compare the destination address against the available prefixes and inspect the selected route rather than assuming that the default or broadest route will always be used.

Question 313

Why can a valid routing-table entry still fail to provide application connectivity?

1. Other processing such as Security Policy, NAT, or path selection can affect the flow
2. Routes automatically disable DNS
3. Routing tables guarantee application availability
4. A valid route always bypasses security controls

Correct Answer: 1

Explanation

A valid routing-table entry provides reachability information, but other processing stages can still prevent successful application communication. Security Policy may deny the session, NAT may translate addresses unexpectedly, or SD-WAN path-selection rules may make the available path unsuitable. Return routing and application-level service availability can also affect the result. Therefore, a route alone does not guarantee successful end-to-end communication. Administrators should troubleshoot traffic across multiple layers, beginning with connectivity and routing and then checking security, translation, path selection, and application behavior to identify the actual point of failure.

Question 314

What is the purpose of a route preference or policy mechanism?

1. To influence which available route is selected
2. To configure monitor brightness
3. To identify keyboard language
4. To create application icons

Correct Answer: 1

Explanation

A route preference or policy mechanism can influence which available route is selected when multiple routing choices exist. Depending on the routing protocol and implementation, administrators can use metrics, attributes, administrative preferences, or policy controls to shape route selection. This helps align forwarding behavior with network design requirements such as preferred providers or backup paths. Monitor brightness, keyboard language, and application icons have no relationship to routing decisions. When troubleshooting an unexpected route, administrators should inspect the candidate routes and the policies or attributes affecting their selection rather than focusing only on the destination prefix.

Question 315

What is one benefit of dynamic routing in an SD-WAN environment?

1. It can adapt routing information when network topology changes
2. It permanently fixes every forwarding path
3. It eliminates all security policies
4. It removes the need for IP addressing

Correct Answer: 1

Explanation

Dynamic routing can adapt routing information as network topology and connectivity conditions change. This allows routes to be learned, withdrawn, or recalculated without requiring administrators to manually configure every change. Dynamic routing therefore supports resilient network operation, particularly when multiple sites or paths are involved. It does not permanently fix every forwarding path, eliminate security policies, or remove the need for IP addressing. Administrators should still understand how dynamic routing interacts with SD-WAN policies because route availability and application-aware path selection perform different functions within the overall forwarding process.

Question 316

Which action can help verify that a route learned dynamically is actually being used?

1. Check the effective routing table and forwarding behavior
2. Change the monitor resolution
3. Delete the application definition
4. Disable QoS

Correct Answer: 1

Explanation

Checking the effective routing table and forwarding behavior helps verify whether a dynamically learned route is actually being used. A route may be present in a protocol database but not selected as the active route because another route has preference or a different policy influences selection. Administrators should compare learned routes with the active routing table and, where appropriate, inspect forwarding behavior for the affected destination. Changing monitor resolution, deleting application definitions, or disabling QoS does not verify routing use and could introduce unrelated configuration changes.

Question 317

Which condition can cause a route learned from a routing protocol to disappear?

1. Loss of the relevant routing relationship or advertisement
2. Browser history deletion
3. Monitor power settings
4. Keyboard replacement

Correct Answer: 1

Explanation

Loss of the relevant routing relationship or route advertisement can cause a dynamically learned route to disappear from the active routing information. For example, if a routing neighbor fails or stops advertising a destination, the associated route may eventually be withdrawn or become invalid. Administrators should examine protocol neighbor state, advertisements, timers, and the resulting routing table when a previously available route disappears. Browser history, monitor power settings, and keyboard replacement have no effect on dynamic routing. Understanding route withdrawal is important when diagnosing connectivity changes after WAN or neighbor failures.

Question 318

What is the main purpose of route convergence after a network failure?

1. To update routing information so traffic can use an available alternative
2. To increase monitor resolution
3. To modify user credentials
4. To disable application identification

Correct Answer: 1

Explanation

Route convergence updates routing information after a topology or connectivity change so that traffic can use an appropriate available route. During convergence, routing protocols detect changes, exchange information, and recalculate or select routes according to their mechanisms and policies. The goal is to reduce the period during which traffic may follow stale or unavailable routing information. Monitor resolution, user credentials, and application identification are unrelated. Administrators should consider convergence behavior when evaluating failover because routing recovery and SD-WAN path selection may operate at different layers and timescales during a network event.

Question 319

Which configuration should be reviewed when route redistribution creates an unexpected forwarding path?

1. Redistribution rules and route filters
2. Browser bookmarks
3. Monitor brightness
4. Keyboard shortcuts

Correct Answer: 1

Explanation

Redistribution rules and route filters should be reviewed when route redistribution creates an unexpected forwarding path. A route may have entered a routing domain through redistribution even though administrators did not intend to propagate that prefix. Filtering can restrict which routes are accepted or advertised and help prevent unwanted paths from influencing forwarding. Administrators should also inspect the resulting routing table and relevant protocol advertisements to determine how the unexpected route became active. Browser bookmarks, monitor brightness, and keyboard shortcuts are unrelated to route propagation and should not be part of routing troubleshooting.

Question 320

A branch loses its preferred route but still has another valid route. What should the administrator expect from dynamic routing?

1. It may select or install an alternative route according to routing rules
2. It must permanently stop forwarding
3. It automatically disables all Security Policies
4. It deletes the site configuration

Correct Answer: 1

Explanation

When a preferred route is lost but another valid route remains available, dynamic routing may select or install the alternative route according to the applicable routing protocol and policy rules. The exact behavior depends on route availability, protocol convergence, route preference, and filtering. This does not require disabling Security Policy or deleting site configuration. Administrators should verify that the alternative route is actually learned, selected, and installed in the effective routing table. They should then consider whether SD-WAN path policies and application requirements allow traffic to use the resulting forwarding path.