McAfee Secure

Cisco 300-420 Bundle

Exam Code: 300-420

Exam Name Designing Cisco Enterprise Networks (ENSLD)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

Cisco 300-420 Bundle $25.00
300-420 Sample 1 300-420 Sample 2 300-420 Sample 3 300-420 Sample 4 300-420 Sample 5 300-420 Sample 6 300-420 Sample 7 300-420 Sample 8 300-420 Sample 9 300-420 Sample 10

100% Cisco 300-420 Guaranteed Success With Testking Training Materials

Get Real 300-420 Exam Questions & Expert Verified Answers as Experienced on the Real Exam!

  • Questions & Answers

    300-420 Questions & Answers

    416 Questions & Answers

    The ultimate exam preparation tool, Questions & Answers mirrors the actual 300-420 exam while allowing you to hone and measure every aspect of your test-taking ability.

  • 300-420 Video Course

    300-420 Training Course

    75 Video Lectures

    300-420 Video Course is developed by Cisco Professionals to help you pass the 300-420 exam.

    Description

    This course will improve your knowledge and skills required to pass Designing Cisco Enterprise Networks (ENSLD) exam.

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

Satisfaction Guaranteed

Money Back Guarantee

Testking provides hassle-free money back guarantee with our products. That is because we have 100% trust in the abilities of our professional and experience product team, and our record is a proof of that.

99.6% PASS RATE
Total Cost: $164.98
Bundle Price: $139.98

Purchase Individually

  • Questions & Answers

    Questions & Answers

    416 Questions

    $124.99
  • 300-420 Video Course

    Training Course

    75 Video Lectures

    $39.99

Cisco 300-420 Practice Test 22

Question 210

The network architecture board discusses the following: A new service needs native IPv6 end-to-end while some clients still require IPv4 service continuity. Which technical principle BEST explains the design decision?

  1. DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack.
  2. Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets.
  3. IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities.
  4. An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers.

Explanation

Correct Answer

B:

Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. The correct engineering response is: Deploy dual stack across participating links and hosts with distinct IPv4 and IPv6 routing and security controls. The observable check is: The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed.

Incorrect Answers

A:

Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. The offered choice instead concerns a different principle: DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. Those technical conditions are not interchangeable.

C:

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

D:

Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. 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.

Question 211

The infrastructure team must validate this situation: A new service needs native IPv6 end-to-end while some clients still require IPv4 service continuity. Which acceptance observation BEST establishes the intended result?

  1. Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.
  2. IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.
  3. The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed.
  4. New IPv6 service flows succeed and legacy IPv4-only endpoints remain reachable through documented transition paths.

Explanation

Correct Answer

C:

The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed. Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets.

Incorrect Answers

A:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. In the case being tested, Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. The necessary acceptance evidence is: The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed.

B:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. In the case being tested, Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. The necessary acceptance evidence is: The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed.

D:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. In the case being tested, Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. The necessary acceptance evidence is: The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed.

Question 212

A post-incident design review discusses the following: A new service needs native IPv6 end-to-end while some clients still require IPv4 service continuity. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Maintain an application-dependency matrix before retiring IPv4 on any segment.
  2. Inventory application compatibility and monitor translation capacity and DNS64 behavior.
  3. Document tunnel endpoints, liveness monitoring and underlay dependencies.
  4. Track parity of IPv4 and IPv6 ACL, DNS, monitoring and routing during migration.

Explanation

Correct Answer

D:

Track parity of IPv4 and IPv6 ACL, DNS, monitoring and routing during migration. This control targets the underlying design risk. Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. The follow-up acceptance check remains: The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed.

Incorrect Answers

A:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The repeat risk here is different: Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. A directly relevant preventive control is: Track parity of IPv4 and IPv6 ACL, DNS, monitoring and routing during migration.

B:

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: Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. A directly relevant preventive control is: Track parity of IPv4 and IPv6 ACL, DNS, monitoring and routing during migration.

C:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The repeat risk here is different: Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. A directly relevant preventive control is: Track parity of IPv4 and IPv6 ACL, DNS, monitoring and routing during migration.

Question 213

During a network design workshop, the team finds this issue: Two IPv6 islands must communicate through an IPv4-only transport that cannot be upgraded this quarter. 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. Design an IPv6-over-IPv4 tunnel between capable edge devices and account for MTU overhead.
  3. Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies.
  4. Narrow the summary or correct allocation so the aggregate represents reachable subordinate networks.

Explanation

Correct Answer

B:

Design an IPv6-over-IPv4 tunnel between capable edge devices and account for MTU overhead. This action addresses the stated design problem. An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. A practical confirmation is: IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.

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: an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The needed response is: Design an IPv6-over-IPv4 tunnel between capable edge devices and account for MTU overhead.

C:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The actual fault is governed by a different mechanism: an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The needed response is: Design an IPv6-over-IPv4 tunnel between capable edge devices and account for MTU overhead.

D:

EIGRP summarization can hide detailed routes; an overbroad aggregate may attract traffic to nonexistent destinations. The actual fault is governed by a different mechanism: an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The needed response is: Design an IPv6-over-IPv4 tunnel between capable edge devices and account for MTU overhead.

Question 214

In a technical design review: Two IPv6 islands must communicate through an IPv4-only transport that cannot be upgraded this quarter. Which technical principle BEST explains the design decision?

  1. Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets.
  2. DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack.
  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

C:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The correct engineering response is: Design an IPv6-over-IPv4 tunnel between capable edge devices and account for MTU overhead. The observable check is: IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.

Incorrect Answers

A:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. 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.

B:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The offered choice instead concerns a different principle: DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. Those technical conditions are not interchangeable.

D:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. 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 215

An engineering reviewer needs objective proof for the following: Two IPv6 islands must communicate through an IPv4-only transport that cannot be upgraded this quarter. Which acceptance observation BEST establishes the intended result?

  1. The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed.
  2. Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.
  3. Each VLAN has a unique /64 and clients form valid IPv6 addresses with correct gateway reachability.
  4. IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.

Explanation

Correct Answer

D:

IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes. An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers.

Incorrect Answers

A:

Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. In the case being tested, an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The necessary acceptance evidence is: IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.

B:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. In the case being tested, an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The necessary acceptance evidence is: IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.

C:

IPv6 LAN autoconfiguration normally relies on a /64 subnet; a /48 supports many distinct /64 subnets. In the case being tested, an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The necessary acceptance evidence is: IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.

Question 216

The change advisory board sees a repeat risk in this case: Two IPv6 islands must communicate through an IPv4-only transport that cannot be upgraded this quarter. 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. Standardize key rotation and restrict routing adjacency interfaces.

Explanation

Correct Answer

A:

Document tunnel endpoints, liveness monitoring and underlay dependencies. This control targets the underlying design risk. An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. The follow-up acceptance check remains: IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.

Incorrect Answers

B:

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: an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. A directly relevant preventive control is: Document tunnel endpoints, liveness monitoring and underlay dependencies.

C:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The repeat risk here is different: an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. A directly relevant preventive control is: Document tunnel endpoints, liveness monitoring and underlay dependencies.

D:

Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. The repeat risk here is different: an overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. A directly relevant preventive control is: Document tunnel endpoints, liveness monitoring and underlay dependencies.

Question 217

A design team must resolve this enterprise network problem: IPv6-only branch clients need controlled access to an IPv4-only external application by its DNS name. 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. Prioritize native IPv6 for new workloads while preserving explicit interworking boundaries for legacy IPv4 dependencies.
  3. Evaluate a DNS64/NAT64 boundary where application protocols and addressing meet the translation requirements.
  4. Assess feasible paths and configure supported EIGRP unequal-cost load balancing with variance when appropriate.

Explanation

Correct Answer

C:

Evaluate a DNS64/NAT64 boundary where application protocols and addressing meet the translation requirements. This action addresses the stated design problem. DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. A practical confirmation is: Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.

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: DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The needed response is: Evaluate a DNS64/NAT64 boundary where application protocols and addressing meet the translation requirements.

B:

IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. The actual fault is governed by a different mechanism: DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The needed response is: Evaluate a DNS64/NAT64 boundary where application protocols and addressing meet the translation requirements.

D:

EIGRP variance permits qualifying feasible routes of unequal metric to participate in load sharing; it does not waive loop-free feasibility checks. The actual fault is governed by a different mechanism: DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The needed response is: Evaluate a DNS64/NAT64 boundary where application protocols and addressing meet the translation requirements.

Question 218

The design record describes this issue: IPv6-only branch clients need controlled access to an IPv4-only external application by its DNS name. 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. Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information.
  4. DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack.

Explanation

Correct Answer

D:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The correct engineering response is: Evaluate a DNS64/NAT64 boundary where application protocols and addressing meet the translation requirements. The observable check is: Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.

Incorrect Answers

A:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The offered choice instead concerns a different principle: IPv6 migration can use native dual stack, overlays, or translation boundaries according to transport capabilities. Those technical conditions are not interchangeable.

B:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. 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:

DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The offered choice instead concerns a different principle: Routing protocol authentication helps prevent unauthenticated devices from injecting link-state information. Those technical conditions are not interchangeable.

Question 219

After designing a change for the following scenario: IPv6-only branch clients need controlled access to an IPv4-only external application by its DNS name. Which acceptance observation BEST establishes the intended result?

  1. Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.
  2. IPv6 endpoints communicate across the tunnel and PMTU testing confirms usable packet sizes.
  3. The same service is reachable over IPv4 and IPv6, and separate policy logs show both paths allowed.
  4. Routing aggregates match assigned site boundaries and no two VLANs share a unicast prefix.

Explanation

Correct Answer

A:

Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses. DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack.

Incorrect Answers

B:

An overlay tunnel encapsulates one protocol through the underlay without upgrading intermediate IPv4-only routers. In the case being tested, DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The necessary acceptance evidence is: Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.

C:

Dual stack runs both protocol families natively; it does not translate IPv4 packets into IPv6 packets. In the case being tested, DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The necessary acceptance evidence is: Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.

D:

Hierarchical IPv6 prefix planning supports route summarization and stable per-link /64 subnets. In the case being tested, DNS64 can synthesize AAAA records and NAT64 translates eligible IPv6 flows to IPv4; it is not ordinary dual stack. The necessary acceptance evidence is: Eligible IPv6-only clients resolve and connect to the IPv4-only service without direct IPv4 addresses.

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.