Question 80
A multi-transport branch has private MPLS and public Internet connections; policy must distinguish transport colors rather than assume all tunnel endpoints share one class. The initial change is: Map transport interfaces to intended supported SD-WAN colors and select TLOCs in policy. Which continuing control most directly prevents a recurrence of the documented problem: An Internet-only traffic policy chooses an MPLS TLOC after a template update.
- Monitor TLOC-extension interface status and transport next-hop routing during site maintenance.
- Test inbound/outbound NAT behavior for the intended SD-WAN transport and maintain compatible firewall rules.
- Verify local-vs-central template/policy scope before activation.
- Review transport color, encapsulation and allowed colors at every edge refresh.
Explanation
Correct Answer
D:The continuing protective control is: Review transport color, encapsulation and allowed colors at every edge refresh. This addresses the underlying failure mechanism: transport color classification or policy match does not reflect the physical circuit role. The corresponding operational check is: inspect live local/remote TLOC color attributes and confirm the intended transport is selected.
Incorrect Answers
A:That control reduces a separate risk: It has no functioning TLOC extension path to the peer transport. For the described design, the recurring risk arises from: transport color classification or policy match does not reflect the physical circuit role. The specific required safeguard is: review transport color, encapsulation and allowed colors at every edge refresh.
B:That control reduces a separate risk: NAT mappings and data-plane tunnel reachability fail even though control connections succeeded. For the described design, the recurring risk arises from: transport color classification or policy match does not reflect the physical circuit role. The specific required safeguard is: review transport color, encapsulation and allowed colors at every edge refresh.
C:That control reduces a separate risk: The policy was distributed centrally instead of scoped to the single local branch. For the described design, the recurring risk arises from: transport color classification or policy match does not reflect the physical circuit role. The specific required safeguard is: review transport color, encapsulation and allowed colors at every edge refresh.
Question 81
A branch with carrier-grade NAT establishes control channels, but other edges cannot bring up usable direct data tunnels. The incident evidence is: OMP peers are healthy while the remote branch has no established data tunnel through translated endpoints. Which targeted configuration or design change best addresses the failure?
- Create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution.
- Map transport interfaces to intended supported SD-WAN colors and select TLOCs in policy.
- Implement a supported local TLOC extension between the two edges with required transport and routing settings.
- Check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings before changing routing.
Explanation
Correct Answer
D:The required correction is: Check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings before changing routing. The underlying failure mechanism is: NAT mappings and data-plane tunnel reachability fail even though control connections succeeded. Verify success by carrying out this direct test: correlate control-connection information with BFD/IPsec tunnel health across the translated transport.
Incorrect Answers
A:Creating and activating a supported centralized control policy with correct site/VPN scope and Controller distribution would not check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings.
B:Mapping transport interfaces to intended supported SD-WAN colors and selecting TLOCs in policy would not check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings.
C:Implementing a supported local TLOC extension between the two edges with required transport and routing settings would not check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings.
Question 82
A branch with carrier-grade NAT establishes control channels, but other edges cannot bring up usable direct data tunnels. The proposed remedy is: Check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings before changing routing. Which observation would most directly confirm that remedy works as intended?
- Check that the second edge advertises and can use the peer circuit's extended transport location.
- Correlate control-connection information with BFD/IPsec tunnel health across the translated transport.
- Verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
- Inspect live local/remote TLOC color attributes and confirm the intended transport is selected.
Explanation
Correct Answer
B:The decisive acceptance observation is: Correlate control-connection information with BFD/IPsec tunnel health across the translated transport. This tests the working mechanism, while the original incident was: oMP peers are healthy while the remote branch has no established data tunnel through translated endpoints.
Incorrect Answers
A:This test measures a different behavior: Check that the second edge advertises and can use the peer circuit's extended transport location. It does not establish the target outcome. For the documented fault, the direct acceptance test is: correlate control-connection information with BFD/IPsec tunnel health across the translated transport.
C:This test measures a different behavior: Verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes. It does not establish the target outcome. For the documented fault, the direct acceptance test is: correlate control-connection information with BFD/IPsec tunnel health across the translated transport.
D:This test measures a different behavior: Inspect live local/remote TLOC color attributes and confirm the intended transport is selected. It does not establish the target outcome. For the documented fault, the direct acceptance test is: correlate control-connection information with BFD/IPsec tunnel health across the translated transport.
Question 83
A branch with carrier-grade NAT establishes control channels, but other edges cannot bring up usable direct data tunnels. During troubleshooting: OMP peers are healthy while the remote branch has no established data tunnel through translated endpoints. Which underlying cause best explains the recorded behavior?
- It has no functioning TLOC extension path to the peer transport.
- NAT mappings and data-plane tunnel reachability fail even though control connections succeeded.
- Transport color classification or policy match does not reflect the physical circuit role.
- The control policy exists but is not active for the relevant control-plane sites.
Explanation
Correct Answer
B:The actual technical cause is: NAT mappings and data-plane tunnel reachability fail even though control connections succeeded. It specifically explains the observation: oMP peers are healthy while the remote branch has no established data tunnel through translated endpoints. The correcting configuration is: check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings before changing routing.
Incorrect Answers
A:That diagnosis is supported by a different symptom: The backup router loses all transport connectivity when its directly attached ISP circuit fails. Here the recorded observation is: oMP peers are healthy while the remote branch has no established data tunnel through translated endpoints. The applicable cause is: nAT mappings and data-plane tunnel reachability fail even though control connections succeeded.
C:That diagnosis is supported by a different symptom: An Internet-only traffic policy chooses an MPLS TLOC after a template update. Here the recorded observation is: oMP peers are healthy while the remote branch has no established data tunnel through translated endpoints. The applicable cause is: nAT mappings and data-plane tunnel reachability fail even though control connections succeeded.
D:That diagnosis is supported by a different symptom: Routes stay unchanged because a drafted policy was never activated or applied to a site list. Here the recorded observation is: oMP peers are healthy while the remote branch has no established data tunnel through translated endpoints. The applicable cause is: nAT mappings and data-plane tunnel reachability fail even though control connections succeeded.
Question 84
A branch with carrier-grade NAT establishes control channels, but other edges cannot bring up usable direct data tunnels. The initial change is: Check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings before changing routing. Which continuing control most directly prevents a recurrence of the documented problem: OMP peers are healthy while the remote branch has no established data tunnel through translated endpoints.
- Keep site-list membership and policy activation in formal review with route-level tests.
- Monitor TLOC-extension interface status and transport next-hop routing during site maintenance.
- Test inbound/outbound NAT behavior for the intended SD-WAN transport and maintain compatible firewall rules.
- Review transport color, encapsulation and allowed colors at every edge refresh.
Explanation
Correct Answer
C:The continuing protective control is: Test inbound/outbound NAT behavior for the intended SD-WAN transport and maintain compatible firewall rules. This addresses the underlying failure mechanism: nAT mappings and data-plane tunnel reachability fail even though control connections succeeded. The corresponding operational check is: correlate control-connection information with BFD/IPsec tunnel health across the translated transport.
Incorrect Answers
A:That control reduces a separate risk: The control policy exists but is not active for the relevant control-plane sites. For the described design, the recurring risk arises from: nAT mappings and data-plane tunnel reachability fail even though control connections succeeded. The specific required safeguard is: test inbound/outbound NAT behavior for the intended SD-WAN transport and maintain compatible firewall rules.
B:That control reduces a separate risk: It has no functioning TLOC extension path to the peer transport. For the described design, the recurring risk arises from: nAT mappings and data-plane tunnel reachability fail even though control connections succeeded. The specific required safeguard is: test inbound/outbound NAT behavior for the intended SD-WAN transport and maintain compatible firewall rules.
D:That control reduces a separate risk: Transport color classification or policy match does not reflect the physical circuit role. For the described design, the recurring risk arises from: nAT mappings and data-plane tunnel reachability fail even though control connections succeeded. The specific required safeguard is: test inbound/outbound NAT behavior for the intended SD-WAN transport and maintain compatible firewall rules.
Question 85
One SD-WAN customer needs a policy that affects all regions' branch-to-data-center routing consistently. The incident evidence is: Routes stay unchanged because a drafted policy was never activated or applied to a site list. Which targeted configuration or design change best addresses the failure?
- Check SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings before changing routing.
- Create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution.
- Use supported localized policy on the target edge or site template for the required behavior.
- Map transport interfaces to intended supported SD-WAN colors and select TLOCs in policy.
Explanation
Correct Answer
B:The required correction is: Create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution. The underlying failure mechanism is: The control policy exists but is not active for the relevant control-plane sites. Verify success by carrying out this direct test: verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
Incorrect Answers
A:Checking SD-WAN NAT traversal behavior and reachable TLOC public/private address mappings would not create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution.
C:Using supported localized policy on the target edge or site template for the required behavior would not create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution.
D:Mapping transport interfaces to intended supported SD-WAN colors and selecting TLOCs in policy would not create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution.
Question 86
One SD-WAN customer needs a policy that affects all regions' branch-to-data-center routing consistently. The proposed remedy is: Create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution. Which observation would most directly confirm that remedy works as intended?
- Inspect live local/remote TLOC color attributes and confirm the intended transport is selected.
- Confirm local feature-policy match counters change at only the intended branch.
- Verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
- Correlate control-connection information with BFD/IPsec tunnel health across the translated transport.
Explanation
Correct Answer
C:The decisive acceptance observation is: Verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes. This tests the working mechanism, while the original incident was: routes stay unchanged because a drafted policy was never activated or applied to a site list.
Incorrect Answers
A:This test measures a different behavior: Inspect live local/remote TLOC color attributes and confirm the intended transport is selected. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
B:This test measures a different behavior: Confirm local feature-policy match counters change at only the intended branch. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
D:This test measures a different behavior: Correlate control-connection information with BFD/IPsec tunnel health across the translated transport. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
Question 87
One SD-WAN customer needs a policy that affects all regions' branch-to-data-center routing consistently. During troubleshooting: Routes stay unchanged because a drafted policy was never activated or applied to a site list. Which underlying cause best explains the recorded behavior?
- The control policy exists but is not active for the relevant control-plane sites.
- NAT mappings and data-plane tunnel reachability fail even though control connections succeeded.
- The policy was distributed centrally instead of scoped to the single local branch.
- Transport color classification or policy match does not reflect the physical circuit role.
Explanation
Correct Answer
A:The actual technical cause is: The control policy exists but is not active for the relevant control-plane sites. It specifically explains the observation: routes stay unchanged because a drafted policy was never activated or applied to a site list. The correcting configuration is: create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution.
Incorrect Answers
B:That diagnosis is supported by a different symptom: OMP peers are healthy while the remote branch has no established data tunnel through translated endpoints. Here the recorded observation is: routes stay unchanged because a drafted policy was never activated or applied to a site list. The applicable cause is: the control policy exists but is not active for the relevant control-plane sites.
C:That diagnosis is supported by a different symptom: All branch routers unexpectedly change behavior after a supposed site-only QoS update. Here the recorded observation is: routes stay unchanged because a drafted policy was never activated or applied to a site list. The applicable cause is: the control policy exists but is not active for the relevant control-plane sites.
D:That diagnosis is supported by a different symptom: An Internet-only traffic policy chooses an MPLS TLOC after a template update. Here the recorded observation is: routes stay unchanged because a drafted policy was never activated or applied to a site list. The applicable cause is: the control policy exists but is not active for the relevant control-plane sites.
Question 88
One SD-WAN customer needs a policy that affects all regions' branch-to-data-center routing consistently. Select TWO complementary decisions: the direct technical remedy and a safeguard against recurrence. A verification-only step cannot substitute for either action.
- Create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution.
- Map transport interfaces to intended supported SD-WAN colors and select TLOCs in policy.
- Keep site-list membership and policy activation in formal review with route-level tests.
- Test inbound/outbound NAT behavior for the intended SD-WAN transport and maintain compatible firewall rules.
- Use supported localized policy on the target edge or site template for the required behavior.
Explanation
Correct Answers
A:The required correction is: Create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution. The underlying failure mechanism is: The control policy exists but is not active for the relevant control-plane sites. Verify success by carrying out this direct test: verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
C:The continuing protective control is: Keep site-list membership and policy activation in formal review with route-level tests. This addresses the underlying failure mechanism: the control policy exists but is not active for the relevant control-plane sites. The corresponding operational check is: verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
Incorrect Answers
B:Transport colors and TLOC selection describe path endpoints, not a centralized policy distributed consistently to every branch region.
D:That control reduces a separate risk: NAT mappings and data-plane tunnel reachability fail even though control connections succeeded. For the described design, the recurring risk arises from: the control policy exists but is not active for the relevant control-plane sites. The specific required safeguard is: keep site-list membership and policy activation in formal review with route-level tests.
E:A localized edge policy cannot enforce the requested routing behavior uniformly across all regions.
Question 89
A single SD-WAN branch needs to treat a locally sourced traffic class without rewriting globally distributed policy for hundreds of sites. The incident evidence is: All branch routers unexpectedly change behavior after a supposed site-only QoS update. Which targeted configuration or design change best addresses the failure?
- Create and activate a supported centralized control policy with correct site/VPN scope and Controller distribution.
- Map transport interfaces to intended supported SD-WAN colors and select TLOCs in policy.
- Implement a supported local TLOC extension between the two edges with required transport and routing settings.
- Use supported localized policy on the target edge or site template for the required behavior.
Explanation
Correct Answer
D:The required correction is: Use supported localized policy on the target edge or site template for the required behavior. The underlying failure mechanism is: The policy was distributed centrally instead of scoped to the single local branch. Verify success by carrying out this direct test: confirm local feature-policy match counters change at only the intended branch.
Incorrect Answers
A:Creating and activating a supported centralized control policy with correct site/VPN scope and Controller distribution would not meet the need for supported localized policy on the target edge or site template for the required behavior.
B:Mapping transport interfaces to intended supported SD-WAN colors and selecting TLOCs in policy would not meet the need for supported localized policy on the target edge or site template for the required behavior.
C:Implementing a supported local TLOC extension between the two edges with required transport and routing settings would not meet the need for supported localized policy on the target edge or site template for the required behavior.
Question 90
A single SD-WAN branch needs to treat a locally sourced traffic class without rewriting globally distributed policy for hundreds of sites. The proposed remedy is: Use supported localized policy on the target edge or site template for the required behavior. Which observation would most directly confirm that remedy works as intended?
- Inspect live local/remote TLOC color attributes and confirm the intended transport is selected.
- Verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes.
- Confirm local feature-policy match counters change at only the intended branch.
- Check that the second edge advertises and can use the peer circuit's extended transport location.
Explanation
Correct Answer
C:The decisive acceptance observation is: Confirm local feature-policy match counters change at only the intended branch. This tests the working mechanism, while the original incident was: all branch routers unexpectedly change behavior after a supposed site-only QoS update.
Incorrect Answers
A:This test measures a different behavior: Inspect live local/remote TLOC color attributes and confirm the intended transport is selected. It does not establish the target outcome. For the documented fault, the direct acceptance test is: confirm local feature-policy match counters change at only the intended branch.
B:This test measures a different behavior: Verify the intended sites receive the policy and resulting OMP/TLOC choices change only for eligible prefixes. It does not establish the target outcome. For the documented fault, the direct acceptance test is: confirm local feature-policy match counters change at only the intended branch.
D:This test measures a different behavior: Check that the second edge advertises and can use the peer circuit's extended transport location. It does not establish the target outcome. For the documented fault, the direct acceptance test is: confirm local feature-policy match counters change at only the intended branch.
Implementing Cisco Enterprise Network Core Technologies (ENCOR) (350-401) Practice Tests