Cisco 300-420 ENSLD Exam Practice Questions
US$39
Every question with the correct answer and why the other options are wrong.
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Three of the 417 questions in this pack
Question 1
Which two BGP features will result in successful route exchanges between eBGP neighbors sharing the same AS number? (Choose two.)
Show answer and explanation
Correct answer: D, E. as-override; allow-as-in
When two eBGP neighbors share the same AS number, they are considered eBGP peers in a confederation-like scenario. The as-override feature allows a router to replace the peer's AS number in the AS path, enabling the route to be accepted by the eBGP neighbor that would normally reject it due to AS path loop prevention. The allow-as-in feature permits a router to accept and advertise routes that contain its own AS number in the AS path, which would normally be rejected as a loop. Together, these features enable successful route exchanges between eBGP neighbors with identical AS numbers.
Why the other options are wrong
- A. advertise-best-external only advertises the best external route to iBGP peers and does not permit same-AS eBGP adjacencies.
- B. bestpath as-path ignore disables AS path length comparison but does not address the AS loop prevention that blocks same-AS eBGP neighbors.
- C. client-to-client reflection is an iBGP feature for route reflection and does not enable eBGP adjacencies with identical AS numbers.
Question 2
A customer with an IPv4 only network topology wants to enable IPv6 connectivity while preserving the IPv4 topology services. The customer plans to migrate IPv4 services to the IPv6 topology, then decommission the IPv4 topology. Which topology supports these requirements?
Show answer and explanation
Correct answer: A. dual stack
Dual stack is the deployment model that allows both IPv4 and IPv6 to coexist on the same network infrastructure. This enables the customer to preserve existing IPv4 topology services while simultaneously introducing IPv6 connectivity. Applications and devices can gradually migrate from IPv4 to IPv6 over time, and once all services have been transitioned, the IPv4 topology can be decommissioned. This approach provides the necessary transition pathway while maintaining service continuity.
Why the other options are wrong
- B. 6VPE (IPv6 VPN Provider Edge) is used for IPv6 MPLS VPN services and does not preserve the IPv4 topology as required.
- C. 6to4 is a transition mechanism that encapsulates IPv6 in IPv4 but is not designed for long-term dual operation and service migration.
- D. NAT64 translates between IPv6 and IPv4 networks but does not preserve the existing IPv4 topology or support concurrent migration.
Question 3
A company is running BGP on a single router, which has two connections to the same ISP. Which BGP feature ensures traffic is load balanced across the two links to the ISP?
Show answer and explanation
Correct answer: B. Multipath Load Sharing
Multipath Load Sharing is the BGP feature that enables load balancing across multiple equal-cost paths. When a router has two connections to the same ISP with equivalent path metrics, this feature allows traffic to be distributed across both links rather than using a single path. This maximizes bandwidth utilization and provides redundancy by actively using both connections.
Why the other options are wrong
- A. Multihop is used for eBGP sessions that are not directly connected and does not control load balancing.
- C. Next-Hop Address Tracking monitors the reachability of next-hop addresses but does not enable multipath load balancing.
- D. AS-Path Prepending artificially lengthens the AS path to make certain routes less preferred and does not enable load balancing.
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How much of the Cisco 300-420 ENSLD bank is free?
417 questions in the bankEach step includes the one before, so buying only adds new questions.
- You are here10questionsFree sampleThree on this page, all ten as a PDF.Download the sample
- 10425% of the bankPractice pageFree on the site, every answer explained.Go to the practice page
- 16239% of the bankHalf PackFree by email, as one PDF, every answer explained.Get the Half Pack
- 417100%, the whole bankFull pack, US$39Plus the questions-only PDF, monthly updates, refund if you fail.Get the full pack
What’s in the Cisco 300-420 ENSLD pack
- 417 questions across all five ENSLD domains
- Answers and explanations for every question, including the wrong options
- A questions-only PDF for timed practice runs
- Delivered by email shortly after checkout
- Free monthly updates for as long as the exam is live
- Pass or your money back
A failed 300-420 attempt costs another US$300. This pack is US$39, paid once, and refunded if you fail.
What makes the ENSLD hard
ENSLD is the odd one out among CCNP Enterprise concentrations because it tests design judgement rather than configuration. There are no CLI outputs to read; the questions describe a requirement and ask which design meets it. Engineers who pass ENARSI easily often find this one harder, because the wrong answers are all technically valid designs, just not the best one for the constraints given.
Addressing and routing, and campus design, are 25% each. Routing covers structured IPv4 and IPv6 plans, stable and scalable IS-IS, EIGRP, OSPF and BGP designs, and IPv6 migration by overlay, dual-stack or translation. Campus covers FHRPs, STP scalability, PoE, Layer 2 security, multicampus Layer 3 design, and SD-Access architecture. WAN at 20% includes Layer 2 VPN, MPLS L3VPN, SD-WAN customer edge, DMVPN and GET VPN. Network services covers QoS policies, management network design and multicast. Automation is 10%: YANG model families, NETCONF versus RESTCONF, telemetry, and cloud connectivity options.
About the exam
300-420 (Designing Cisco Enterprise Networks v1.1, ENSLD) earns the Cisco Certified Specialist, Enterprise Design certification and counts as a concentration exam for CCNP Enterprise. It covers advanced addressing and routing design, enterprise campus and SD-Access design, WAN and SD-WAN design, QoS, management and multicast services, and automation and cloud connectivity. No prerequisites.
Questions before you buy
How quickly do I receive it?
Your PDF is prepared and sent to your email address after checkout, and you get a confirmation as soon as it is on its way.
Are updates included?
Yes. The pack is updated every month for as long as the exam is live, and updates are free for everyone who has bought it.
What if I fail the exam?
We refund the pack, or swap it for any other pack if you would rather keep studying. Sit the exam 7 to 30 days after buying, then send your official score report within 7 days of the exam date, as set out in the refund policy.
What is your pass rate?
99% of customers who prepare with a CertStash pack pass. If you do not, we refund the pack, or swap it for another pack.
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Each purchase is licensed to one person. For a team, school or training organisation, email support@certstash.com for a licence that fits.
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