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Cisco 350-501 Practice Test 45

Question 440

For an original SPCOR service-provider engineering scenario, consider: A service provider expects a PCE to provision all SR paths but the headend PCC has no valid controller session or delegation status. Select TWO complementary steps: the targeted correction and its strongest prechange validation.

  1. Assume a controller dashboard path sketch can program an SRTE router without PCEP connectivity or supported policy delegation.
  2. Change: Interpret MPLS label operations, bottom-of-stack state and egress handling based on the signaled FEC and selected pop or explicit-null behavior.
  3. Check: Inspect protected interface and facility state, bypass path validity and measured traffic loss when the link or node is disabled.
  4. Change: Establish an authenticated PCE-PCC control relationship, current topology data and valid policy delegation or candidate update handling.
  5. Check: Inspect PCEP session state, computed path constraints, delegated policy ownership, SID reachability and actual headend candidate state.

Explanation

Correct Answer

D:

A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination. Acceptance: The headend accepts only valid controller-computed paths and falls back according to defined policy when PCE control is unavailable.

E:

A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination. Required intervention: Establish an authenticated PCE-PCC control relationship, current topology data and valid policy delegation or candidate update handling.

Incorrect Answers

A:

For this select two assessment, the shortcut changes or bypasses the necessary routing, service or operational boundary rather than correcting it. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

B:

Change: Interpret MPLS label operations, bottom-of-stack state and egress handling based on the signaled FEC and selected pop or explicit-null behavior. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

C:

Check: Inspect protected interface and facility state, bypass path validity and measured traffic loss when the link or node is disabled. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

Question 441

A service provider network engineer is reviewing this backbone or customer-service scenario: A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability. A proposed shortcut is: Assume a controller dashboard path sketch can program an SRTE router without PCEP connectivity or supported policy delegation. What should the service provider engineer recommend as the narrowly scoped correction? Select ONE best answer.

  1. Assume a controller dashboard path sketch can program an SRTE router without PCEP connectivity or supported policy delegation.
  2. Establish an authenticated PCE-PCC control relationship, current topology data and valid policy delegation or candidate update handling.
  3. Allocate routable SRv6 locators and supported endpoint behaviors and design explicit interworking for differing SR data planes.
  4. Enable a supported TI-LFA protection mechanism and confirm the repair list is loop-free for the protected link or node failure.

Explanation

Correct Answer

B:

This targeted action addresses the observed service-provider control or forwarding gap without discarding necessary controls. Applied case: A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability.

Incorrect Answers

A:

A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination. Applied case: A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability.

C:

Allocate routable SRv6 locators and supported endpoint behaviors and design explicit interworking for differing SR data planes. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

D:

Enable a supported TI-LFA protection mechanism and confirm the repair list is loop-free for the protected link or node failure. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

Question 442

A Cisco service provider design review finds: A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability. The team proposes: Establish an authenticated PCE-PCC control relationship, current topology data and valid policy delegation or candidate update handling. Which engineering principle most strongly supports the recommended response? Select ONE best answer.

  1. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.
  2. LDP session protection can preserve an established LDP session using alternate IP reachability during local link interruptions but depends on continued peer transport.
  3. MPLS LSP ping and traceroute test labeled forwarding equivalence classes and can identify failures hidden behind successful IP control-plane checks.
  4. Penultimate-hop popping removes the outer transport label before egress, while explicit-null retains a label where required for policy or QoS handling.

Explanation

Correct Answer

A:

Demonstrable success requires: The headend accepts only valid controller-computed paths and falls back according to defined policy when PCE control is unavailable. Applied case: A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability.

Incorrect Answers

B:

This option addresses a different service provider engineering topic (LDP session protection and targeted transport) rather than the documented PCE-PCC delegation and SRTE path computation decision.

C:

MPLS LSP ping and traceroute test labeled forwarding equivalence classes and can identify failures hidden behind successful IP control-plane checks. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

D:

Penultimate-hop popping removes the outer transport label before egress, while explicit-null retains a label where required for policy or QoS handling. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

Question 443

The service provider operations team has not yet approved a change. Current evidence indicates: A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability. Which evidence best tests the technical diagnosis before approving a disruptive change? Select ONE best answer.

  1. Inspect protected interface and facility state, bypass path validity and measured traffic loss when the link or node is disabled.
  2. Inspect LDP discovery and session state, transport address routing, label binding and hardware forwarding labels along the path.
  3. Check IPv6 locator advertisements, SID behavior, encapsulation and decapsulation and gateway forwarding for a test VPN or steered flow.
  4. Inspect PCEP session state, computed path constraints, delegated policy ownership, SID reachability and actual headend candidate state.

Explanation

Correct Answer

D:

A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination. Confirm afterward that: The headend accepts only valid controller-computed paths and falls back according to defined policy when PCE control is unavailable.

Incorrect Answers

A:

Inspect protected interface and facility state, bypass path validity and measured traffic loss when the link or node is disabled. A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability.

B:

Inspect LDP discovery and session state, transport address routing, label binding and hardware forwarding labels along the path. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

C:

Check IPv6 locator advertisements, SID behavior, encapsulation and decapsulation and gateway forwarding for a test VPN or steered flow. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

Question 444

A candidate correction has been tested and the platform team requires a post-change acceptance check. Original problem: A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability. The carrier operations owner needs positive and negative tests showing existing customer services remain available. Which acceptance result demonstrates correct service provider forwarding and control behavior without disrupting authorized workflows? Select ONE best answer.

  1. Traffic does not migrate onto the recovered path until a valid label-switched transport is available.
  2. Remote PEs have resolvable label-switched transport paths through interarea boundaries without flooding all service routes into core IGPs.
  3. The steered flow crosses the required link and falls back safely if that adjacency is not available.
  4. The headend accepts only valid controller-computed paths and falls back according to defined policy when PCE control is unavailable.

Explanation

Correct Answer

D:

A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination. The approved implementation step was: Establish an authenticated PCE-PCC control relationship, current topology data and valid policy delegation or candidate update handling.

Incorrect Answers

A:

Traffic does not migrate onto the recovered path until a valid label-switched transport is available. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

B:

Remote PEs have resolvable label-switched transport paths through interarea boundaries without flooding all service routes into core IGPs. A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability.

C:

The steered flow crosses the required link and falls back safely if that adjacency is not available. A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability.

Question 445

An implementation sign-off request identifies the following problem: A controller computes a low-delay candidate path using stale topology information and the headend accepts it without validating actual segment reachability. Which paired technical change and validation should close the implementation review? Select ONE best answer.

  1. Change: Combine node and adjacency SIDs in a segment list with proper endpoint locality and imposed stack depth for an explicit steering requirement. Verify: Trace segment-list execution, SR label stack and the adjacency owner at each hop using a forced parallel-link test.
  2. Change: Verify MPLS forwarding activation, LDP discovery and reachable transport addresses on every required core hop. Verify: Inspect LDP discovery and session state, transport address routing, label binding and hardware forwarding labels along the path.
  3. Change: Enable a supported TI-LFA protection mechanism and confirm the repair list is loop-free for the protected link or node failure. Verify: Compare computed repair SIDs, protected resource, postfailure path and packet-loss duration under a lab failure.
  4. Change: Establish an authenticated PCE-PCC control relationship, current topology data and valid policy delegation or candidate update handling. Verify: Inspect PCEP session state, computed path constraints, delegated policy ownership, SID reachability and actual headend candidate state.

Explanation

Correct Answer

D:

A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination. The change is successful only when: The headend accepts only valid controller-computed paths and falls back according to defined policy when PCE control is unavailable.

Incorrect Answers

A:

Change: Combine node and adjacency SIDs in a segment list with proper endpoint locality and imposed stack depth for an explicit steering requirement. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

B:

Change: Verify MPLS forwarding activation, LDP discovery and reachable transport addresses on every required core hop. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

C:

Change: Enable a supported TI-LFA protection mechanism and confirm the repair list is loop-free for the protected link or node failure. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.

Question 446

A service provider network engineer is reviewing this backbone or customer-service scenario: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function. A proposed shortcut is: Copy raw SR-MPLS labels into IPv6 destination addresses and call it SRv6 interworking with no locator or endpoint function design. What should the service provider engineer recommend as the narrowly scoped correction? Select ONE best answer.

  1. Allocate routable SRv6 locators and supported endpoint behaviors and design explicit interworking for differing SR data planes.
  2. Interpret MPLS label operations, bottom-of-stack state and egress handling based on the signaled FEC and selected pop or explicit-null behavior.
  3. Establish an authenticated PCE-PCC control relationship, current topology data and valid policy delegation or candidate update handling.
  4. Copy raw SR-MPLS labels into IPv6 destination addresses and call it SRv6 interworking with no locator or endpoint function design.

Explanation

Correct Answer

A:

This targeted action addresses the observed service-provider control or forwarding gap without discarding necessary controls. Applied case: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function.

Incorrect Answers

B:

This option addresses a different service provider engineering topic (MPLS forwarding labels PHP explicit-null and TTL) rather than the documented SRv6 locators uSID and interworking gateway decision.

C:

Establish an authenticated PCE-PCC control relationship, current topology data and valid policy delegation or candidate update handling. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

D:

SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains. For this best change assessment, the shortcut changes or bypasses the necessary routing, service or operational boundary rather than correcting it.

Question 447

A Cisco service provider design review finds: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function. The team proposes: Allocate routable SRv6 locators and supported endpoint behaviors and design explicit interworking for differing SR data planes. Which engineering principle most strongly supports the recommended response? Select ONE best answer.

  1. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.
  2. LDP session protection can preserve an established LDP session using alternate IP reachability during local link interruptions but depends on continued peer transport.
  3. A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination.
  4. LDP signaling distributes bindings for forwarding equivalence classes, while an IP routing adjacency alone does not prove label transport is ready.

Explanation

Correct Answer

A:

Demonstrable success requires: Each IPv6 segment resolves to its intended endpoint and traffic crosses SR-MPLS to SRv6 boundaries using supported adaptation. Applied case: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function.

Incorrect Answers

B:

LDP session protection can preserve an established LDP session using alternate IP reachability during local link interruptions but depends on continued peer transport. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

C:

A Path Computation Element calculates constraints-based paths while the PCC enforces or requests them, and PCEP sessions and delegation govern their coordination. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

D:

LDP signaling distributes bindings for forwarding equivalence classes, while an IP routing adjacency alone does not prove label transport is ready. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

Question 448

The service provider operations team has not yet approved a change. Current evidence indicates: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function. Which evidence best tests the technical diagnosis before approving a disruptive change? Select ONE best answer.

  1. Compare MPLS echo replies, incoming and outgoing labels, FEC resolution and per-hop transport under the failed VPN route.
  2. Check IPv6 locator advertisements, SID behavior, encapsulation and decapsulation and gateway forwarding for a test VPN or steered flow.
  3. Inspect the active candidate, preference, BSID or policy steering rules, operational validity and flow path through the backbone.
  4. Test link removal, targeted hello maintenance, TCP session state and alternate loopback reachability while measuring session churn.

Explanation

Correct Answer

B:

This check tests the actual routing, transport or service boundary before an operationally risky response. Applied case: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function.

Incorrect Answers

A:

Compare MPLS echo replies, incoming and outgoing labels, FEC resolution and per-hop transport under the failed VPN route. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

C:

Inspect the active candidate, preference, BSID or policy steering rules, operational validity and flow path through the backbone. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

D:

Test link removal, targeted hello maintenance, TCP session state and alternate loopback reachability while measuring session churn. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

Question 449

A candidate correction has been tested and the platform team requires a post-change acceptance check. Original problem: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function. The carrier operations owner needs positive and negative tests showing existing customer services remain available. Which acceptance result demonstrates correct service provider forwarding and control behavior without disrupting authorized workflows? Select ONE best answer.

  1. Each IPv6 segment resolves to its intended endpoint and traffic crosses SR-MPLS to SRv6 boundaries using supported adaptation.
  2. Targeted traffic follows the active approved policy and reacts predictably when the selected candidate becomes invalid.
  3. The headend accepts only valid controller-computed paths and falls back according to defined policy when PCE control is unavailable.
  4. Traffic does not migrate onto the recovered path until a valid label-switched transport is available.

Explanation

Correct Answer

A:

SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains. Applied case: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function.

Incorrect Answers

B:

Targeted traffic follows the active approved policy and reacts predictably when the selected candidate becomes invalid. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

C:

The headend accepts only valid controller-computed paths and falls back according to defined policy when PCE control is unavailable. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

D:

Traffic does not migrate onto the recovered path until a valid label-switched transport is available. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

Question 450

For an original SPCOR service-provider engineering scenario, consider: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function. Select TWO complementary steps: the targeted correction and its strongest prechange validation.

  1. Check: Check IPv6 locator advertisements, SID behavior, encapsulation and decapsulation and gateway forwarding for a test VPN or steered flow.
  2. Change: Configure supported RSVP local protection mechanisms and verify that a prepared bypass or detour can protect the intended link or node.
  3. Change: Allocate routable SRv6 locators and supported endpoint behaviors and design explicit interworking for differing SR data planes.
  4. Check: Compare computed repair SIDs, protected resource, postfailure path and packet-loss duration under a lab failure.
  5. Copy raw SR-MPLS labels into IPv6 destination addresses and call it SRv6 interworking with no locator or endpoint function design.

Explanation

Correct Answer

A:

SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains. Required intervention: Allocate routable SRv6 locators and supported endpoint behaviors and design explicit interworking for differing SR data planes.

C:

SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains. Evidence: Check IPv6 locator advertisements, SID behavior, encapsulation and decapsulation and gateway forwarding for a test VPN or steered flow.

Incorrect Answers

B:

This option addresses a different service provider engineering topic (RSVP TE fast reroute and local protection) rather than the documented SRv6 locators uSID and interworking gateway decision.

D:

Check: Compare computed repair SIDs, protected resource, postfailure path and packet-loss duration under a lab failure. SRv6 encodes endpoint functions in IPv6 SIDs and uSID compresses supported behavior sequences; interworking gateways translate service or transport context between domains.

E:

For this select two assessment, the shortcut changes or bypasses the necessary routing, service or operational boundary rather than correcting it. Applied case: An SRv6 edge advertises an endpoint behavior using an unassigned locator block, and a remote ingress cannot route IPv6 segment packets to that function.

Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) (350-501) Practice Tests