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Exam Code: 300-420

Exam Name Designing Cisco Enterprise Networks (ENSLD)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

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Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests

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Cisco 300-420 Practice Test 23

Question 220

A preventive architecture review covers this situation: IPv6-only branch clients need controlled access to an IPv4-only external application by its DNS name. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Document tunnel endpoints, liveness monitoring and underlay dependencies.
  2. Inventory application compatibility and monitor translation capacity and DNS64 behavior.
  3. Maintain an application-dependency matrix before retiring IPv4 on any segment.
  4. Publish a site-level IPv6 addressing plan and review allocations before turn-up.

Explanation

Correct Answer

B:

Inventory application compatibility and monitor translation capacity and DNS64 behavior. This control targets the underlying design risk. DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The follow-up acceptance check remains: Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.

Incorrect Answers

A:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The repeat risk here is different: DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. A directly relevant preventive control is: Inventory application compatibility and monitor translation capacity and DNS64 behavior.

C:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The repeat risk here is different: DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. A directly relevant preventive control is: Inventory application compatibility and monitor translation capacity and DNS64 behavior.

D:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. The repeat risk here is different: DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. A directly relevant preventive control is: Inventory application compatibility and monitor translation capacity and DNS64 behavior.

Question 221

A new campus or WAN review presents this constraint: An enterprise has exhausted IPv4 growth at access networks but cloud workloads already support both families. Which action MOST DIRECTLY meets the stated design requirement?

  1. Deploy dual stack across participating links and hosts with distinct IPv4 and IPv6 routing and security controls.
  2. Evaluate a DNS64/NAT64 boundary where application protocols and addressing meet the translation requirements.
  3. Summarize contiguous routes at eligible OSPF area boundaries without masking unavailable destinations.
  4. Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies.

Explanation

Correct Answer

D:

Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies. This action addresses the stated design problem. IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. A practical confirmation is: New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths.

Incorrect Answers

A:

Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. The actual fault is governed by a different mechanism: IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The needed response is: Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies.

B:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The actual fault is governed by a different mechanism: IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The needed response is: Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies.

C:

An OSPF ABR can aggregate interarea prefixes, reducing route detail exported to other areas. The actual fault is governed by a different mechanism: IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The needed response is: Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies.

Question 222

For this Cisco ENSLD design case: An enterprise has exhausted IPv4 growth at access networks but cloud workloads already support both families. Which technical principle BEST explains the design decision?

  1. IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities.
  2. Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets.
  3. An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers.
  4. IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone.

Explanation

Correct Answer

A:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The correct engineering response is: Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies. The observable check is: New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths.

Incorrect Answers

B:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The offered choice instead concerns a different principle: Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. Those technical conditions are not interchangeable.

C:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The offered choice instead concerns a different principle: an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. Those technical conditions are not interchangeable.

D:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The offered choice instead concerns a different principle: IS-IS Level 1 routers maintain area topology while Level 2 provides the interarea backbone. Those technical conditions are not interchangeable.

Question 223

During acceptance testing for this network design: An enterprise has exhausted IPv4 growth at access networks but cloud workloads already support both families. Which acceptance observation BEST establishes the intended result?

  1. IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.
  2. New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths.
  3. Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.
  4. Only expected authenticated IS-IS peers form adjacencies and unauthorized join attempts fail.

Explanation

Correct Answer

B:

New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths. IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities.

Incorrect Answers

A:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. In the case being tested, IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The necessary acceptance evidence is: New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths.

C:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. In the case being tested, IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The necessary acceptance evidence is: New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths.

D:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. In the case being tested, IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The necessary acceptance evidence is: New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths.

Question 224

Operations wants to avoid recurrence of this design flaw: An enterprise has exhausted IPv4 growth at access networks but cloud workloads already support both families. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Inventory application compatibility and monitor translation capacity and DNS64 behavior.
  2. Track parity of IPv4 and IPv6 ACL, DNS, monitoring and routing during migration.
  3. Maintain an application-dependency matrix before retiring IPv4 on any segment.
  4. Make EIGRP stub status part of remote-site configuration templates.

Explanation

Correct Answer

C:

Maintain an application-dependency matrix before retiring IPv4 on any segment. This control targets the underlying design risk. IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The follow-up acceptance check remains: New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths.

Incorrect Answers

A:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The repeat risk here is different: IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. A directly relevant preventive control is: Maintain an application-dependency matrix before retiring IPv4 on any segment.

B:

Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. The repeat risk here is different: IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. A directly relevant preventive control is: Maintain an application-dependency matrix before retiring IPv4 on any segment.

D:

EIGRP stub signaling discourages neighbors from querying the spoke as a transit path for remote routes. The repeat risk here is different: IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. A directly relevant preventive control is: Maintain an application-dependency matrix before retiring IPv4 on any segment.

Question 225

A Cisco enterprise designer reviews the following scenario: A distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. Which action MOST DIRECTLY meets the stated design requirement?

  1. Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.
  2. Use supported multichassis EtherChannel or a valid logical-switch abstraction, or separate the links at Layer 3.
  3. Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.
  4. Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

Explanation

Correct Answer

A:

Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover. This action addresses the stated design problem. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. A practical confirmation is: Client traffic continues through the surviving distribution device after the primary gateway is shut down.

Incorrect Answers

B:

Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. The actual fault is governed by a different mechanism: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The needed response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.

C:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The actual fault is governed by a different mechanism: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The needed response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.

D:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The actual fault is governed by a different mechanism: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The needed response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.

Question 226

The network architecture board discusses the following: A distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. Which technical principle BEST explains the design decision?

  1. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.
  2. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.
  3. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.
  4. BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers.

Explanation

Correct Answer

B:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The correct engineering response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover. The observable check is: Client traffic continues through the surviving distribution device after the primary gateway is shut down.

Incorrect Answers

A:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The offered choice instead concerns a different principle: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. Those technical conditions are not interchangeable.

C:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The offered choice instead concerns a different principle: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. Those technical conditions are not interchangeable.

D:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The offered choice instead concerns a different principle: BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. Those technical conditions are not interchangeable.

Question 227

The infrastructure team must validate this situation: A distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. Which acceptance observation BEST establishes the intended result?

  1. Data-plane traffic remains within loss targets during a controlled route-processor switchover.
  2. Participating platforms elect the expected master and hosts retain gateway reachability after master failure.
  3. Client traffic continues through the surviving distribution device after the primary gateway is shut down.
  4. Loss of a test link is reflected in BFD-down and a timely routing reconvergence event.

Explanation

Correct Answer

C:

Client traffic continues through the surviving distribution device after the primary gateway is shut down. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.

Incorrect Answers

A:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. In the case being tested, an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The necessary acceptance evidence is: Client traffic continues through the surviving distribution device after the primary gateway is shut down.

B:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. In the case being tested, an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The necessary acceptance evidence is: Client traffic continues through the surviving distribution device after the primary gateway is shut down.

D:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. In the case being tested, an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The necessary acceptance evidence is: Client traffic continues through the surviving distribution device after the primary gateway is shut down.

Question 228

A post-incident design review discusses the following: A distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Include upstream-path tracking and recovery hysteresis in gateway designs.
  2. Test control-plane redundancy and helper interactions during staged software upgrades.
  3. Verify actual platform and software interoperability before relying on multivendor FHRP.
  4. Validate timer, tracking, and gateway ownership changes in scheduled failover drills.

Explanation

Correct Answer

D:

Validate timer, tracking, and gateway ownership changes in scheduled failover drills. This control targets the underlying design risk. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The follow-up acceptance check remains: Client traffic continues through the surviving distribution device after the primary gateway is shut down.

Incorrect Answers

A:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The repeat risk here is different: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. A directly relevant preventive control is: Validate timer, tracking, and gateway ownership changes in scheduled failover drills.

B:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The repeat risk here is different: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. A directly relevant preventive control is: Validate timer, tracking, and gateway ownership changes in scheduled failover drills.

C:

VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. The repeat risk here is different: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. A directly relevant preventive control is: Validate timer, tracking, and gateway ownership changes in scheduled failover drills.

Question 229

During a network design workshop, the team finds this issue: During a predeployment review for a regional distribution facility, the team discovers this design gap: a distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use supported NSF or graceful restart mechanisms and verify neighbors’ helper capabilities.
  2. Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.
  3. Deploy supported BFD sessions with routing protocols where subsecond failure detection is needed.
  4. Use upstream interface or route tracking to reduce the gateway priority when critical reachability fails.

Explanation

Correct Answer

B:

Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover. This action addresses the stated design problem. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. A practical confirmation is: Client traffic continues through the surviving distribution device after the primary gateway is shut down. The regional distribution facility acceptance record also captures this result.

Incorrect Answers

A:

Graceful restart separates control-plane recovery from temporary forwarding continuity but requires platform and peer support. The actual fault is governed by a different mechanism: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The needed response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.

C:

BFD provides rapid bidirectional path-liveness detection independent of a routing protocol’s slower dead timers. The actual fault is governed by a different mechanism: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The needed response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.

D:

FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. The actual fault is governed by a different mechanism: an FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The needed response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover.

Question 230

In a technical design review: During a predeployment review for a regional distribution facility, the team discovers this design gap: a distribution-pair maintenance exercise causes the default gateway to vanish when the active SVI fails. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist.
  2. FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway.
  3. An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles.
  4. Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction.

Explanation

Correct Answer

C:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The correct engineering response is: Provide an HSRP or VRRP virtual default gateway across independent eligible devices with tested failover. The observable check is: Client traffic continues through the surviving distribution device after the primary gateway is shut down. The regional distribution facility acceptance record also captures this result.

Incorrect Answers

A:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The offered choice instead concerns a different principle: VRRP provides an interoperable virtual-router gateway mechanism where compatible vendor implementations exist. Those technical conditions are not interchangeable.

B:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The offered choice instead concerns a different principle: FHRP role decisions without upstream tracking can select a locally alive but externally isolated gateway. Those technical conditions are not interchangeable.

D:

An FHRP keeps a stable virtual next-hop address while redundant gateways assume active forwarding roles. The offered choice instead concerns a different principle: Ordinary LACP expects a coherent partner system; independent physical switches cannot act as one LACP system without a suitable abstraction. Those technical conditions are not interchangeable.