Cisco 300-420 Practice Exam Dumps 2025

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Designing Cisco Enterprise Networks (ENSLD) Questions and Answers

Question 1

An engineer must peer with an ISP for internet connectivity using BGP, initially, the engineer wants to receive only specific prefixes from the ISP and a default route. However, the solution must provide the flexibility to add prefixes in the future at short notice. The ISP has a two-week change process in place. Which route filtering solution must the engineer employ?

Options:

Request a limited internet routing table and a default route from the ISP and configure the BGP max-limit to 1 with an access list that permits only the specific internet prefixes and blocked networks

Request only the required prefixes and default route be advertised from the ISO with whitelisted networks

Request a full internet routing table and a default route from the ISP and configure inbound route filtering with a prefix list that permits the default route and required prefixes

Configure outbound route filtering on the enterprise and ISP so that the enterprise tell the ISP which prefixes are required

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Question 2

Refer to the exhibit. A company has some offices that are connected via dark fiber in New York. A network architect must optimize the network design based on the EIGRP routing protocol. The network has hierarchical addressing between 10 and 12 routers in each office. Routing convergence time must be at the minimum. What must the network architect do to reduce the query range?

Options:

Configure stub areas on non-edge routers.

Implement network summarization on edge routers.

Use different EIGRP processes on edge routers.

Configure route filtering on non-edge routers.

Question 3

An engineer is designing a network for a customer running a wireless network with a common VLAN for all APs. The customer is experiencing unicast flooding in the Layer 2 network between the aggregation and access layers. The customer wants to reduce the flooding and improve convergence time. Which solution meets these requirements?

Options:

Migrate all APs to a common Layer 2 access layer switch and run Layer 3 from the aggregation layer to all remaining access layer switches.

Align HSRP primary and STP root bridges and reduce ARP timers to match CAM timers on the aggregation layer switches.

Migrate to a Layer 3 access campus design if the APs can run on separate VLANs.

Align HSRP primary and STP root bridges if the APs cannot run on separate VLANs.

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