cisco 300-420 practice test

Designing Cisco Enterprise Networks (ENSLD)

Last exam update: Nov 29 ,2025
Page 1 out of 23. Viewing questions 1-15 out of 339

Question 1

Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?

  • A. External fusion routers can be used to map VNs to VRFs and selectively route traffic between VRFs.
  • B. GRE tunneling can be configured between fabric edges to connect one VN to another.
  • C. SGTs can be used to permit traffic from one VN to another.
  • D. Route leaking can be used on the fabric border nodes to inject routes from one VN to another.
Mark Question:
Answer:

B


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Question 2

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An engineer must design a VPN solution for a company that has multiple branches connecting to a
main office. What are two advantages of using DMVPN instead of IPsec tunnels to accomplish this
task? (Choose
two.)

  • A. support for AES 256-bit encryption
  • B. greater scalability
  • C. support for anycast gateway
  • D. lower traffic overhead
  • E. dynamic spoke-to-spoke tunnels
Mark Question:
Answer:

B E


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Question 3

Which NETCONF operation creates filtering that is specific to the session notifications?

  • A. <create-subscription>
  • B. <commit>
  • C. <notification>
  • D. <logging>
Mark Question:
Answer:

A


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Question 4

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An enterprise customer has these requirements:
end-to-end QoS for the business-critical applications and VoIP services based on CoS marking.
flexibility to offer services such as IPv6 and multicast without any reliance on the service provider.
support for full-mesh connectivity at Layer 2.
Which WAN connectivity option meets these requirements?

  • A. VPWS
  • B. MPLS VPN
  • C. DMVPN
  • D. VPLS
Mark Question:
Answer:

D


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Question 5

What is a benefit of using VRRPv3 as compared to VRRPv2?

  • A. VRRPv3 supports IPv4 and IPv6
  • B. VRRPv3 supports authentication
  • C. VRRPv3 supports preemption
  • D. VRRPv3 supports stateful switchover
Mark Question:
Answer:

A


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Question 6

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A customer is discussing QoS requirements with a network consultant. The customer has specified
that end-to-end path verification is a requirement. Which QoS solution meets this requirement?

  • A. IntServ model with RSVP to support the traffic flows
  • B. DiffServ model with PHB to support the traffic flows
  • C. marking traffic at the access layer with DSCP to support the traffic flows
  • D. marking traffic at the access layer with CoS to support the traffic flows
Mark Question:
Answer:

A


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Question 7

Which nonproprietary mechanism can be used to automate rendezvous point distribution in a large
PIM domain?

  • A. Embedded RP
  • B. BSR
  • C. Auto-RP
  • D. Static RP
Mark Question:
Answer:

B


Explanation:
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Question 8

Which QoS feature responds to network congestion by dropping lower priority packets?

  • A. CBWFQ
  • B. tail drop
  • C. WRED
  • D. strict priority
Mark Question:
Answer:

C


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Question 9

Which two BGP features will result in successful route exchanges between eBGP neighbors sharing
the same
AS number? (Choose two.)

  • A. advertise-best-external
  • B. bestpath as-path ignore
  • C. client-to-client reflection
  • D. as-override
  • E. allow-as-in
Mark Question:
Answer:

D E


Explanation:
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Question 10

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?

  • A. Multihop
  • B. Multipath Load Sharing
  • C. Next-Hop Address Tracking
  • D. AS-Path Prepending
Mark Question:
Answer:

B


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Question 11

Which design consideration should be observed when EIGRP is configured on Data Center switches?
A. Perform manual summarization on all Layer 3 interfaces to minimize the size of the routing table.
B. Prevent unnecessary EIGRP neighborships from forming across switch virtual interfaces.
C. Lower EIGRP hello and hold timers to their minimum settings to ensure rapid route
reconvergence.
D. Configure multiple EIGRP autonomous systems to segment Data Center services and applications.

Mark Question:
Answer:

A
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Question 12

Which design consideration must be made when using IPv6 overlay tunnels?

  • A. Overlay tunnels that connect isolated IPv6 networks can be considered a final IPv6 network architecture.
  • B. Overlay tunnels should only be considered as a transition technique toward a permanent solution.
  • C. Overlay tunnels can be configured only between border devices and require only the IPv6 protocol stack.
  • D. Overlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure.
Mark Question:
Answer:

B


Explanation:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-3s/ir-xe-3s-
book/ip6-ip4-gre-tunls-xe.pdf
"The use of overlay tunnels should be considered as a transition technique toward a network that
supports both the IPv4 and IPv6 protocol stacks or just the IPv6 protocol stack."

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Question 13

When a network is designed using IS-IS protocol, which two circuit types are supported? (Choose
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two.)

  • A. nonbroadcast multiaccess
  • B. multiaccess
  • C. point-to-multipoint
  • D. nonbroadcast
  • E. point-to-point
Mark Question:
Answer:

BE


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Question 14

What is an advantage of designing an out-of-band network management solution?

  • A. In the event of a production network outage, network devices can still be managed.
  • B. There is no separation between the production network and the management network.
  • C. In the event of a production network outage, it can be used as a backup network path.
  • D. It is less expensive than an in-band management solution
Mark Question:
Answer:

A


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Question 15

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Which consideration must be taken into account when using the DHCP relay feature in a Cisco SD-
Access Architecture?

  • A. DHCP-relay must be enabled on fabric edge nodes to provide the correct mapping of DHCP scope to the local anycast gateway.
  • B. A DHCP server must be enabled on the border nodes to allow subnets to span multiple fabric edges.
  • C. DHCP servers must support Cisco SD-Access extensions to correctly assign IPs to endpoints in an SD-Access fabric with anycast gateway.
  • D. DHCP Option-82 must be enabled to map the circuit IP option to the access fabric node where the DHCP discover originated.
Mark Question:
Answer:

D


Explanation:
https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/tech_notes/sda_dhcp/b_cisco_sda_dhcp.html

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