Free Cisco 300-420 Exam Questions

Become Cisco Certified with updated 300-420 exam questions and correct answers

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Total 381 Questions | Updated On: Jul 22, 2026

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Question 1

Which OSPF area blocks LSA Type 3, 4 and 5, but allows a default summary route?

A : normal

B : stub

C : NSSA

D : totally stubby

Answer: D

Question 2

An engineer is designing a Layer 3 campus network running EIGRP between the core, aggregation, and access layers. The access layer switches will be connected to the aggregation layer using Layer 3 copper connections. The engineer wants to improve convergence time for access layer switch failures. Which technique must the design include?

A : enabling BFD for EIGRP on the access layer uplinks

B : reducing the EIGRP Hello / Hold timer values

C : EIGRP summarization from core to aggregation layer

D : EIGRP summarization from access to aggregation layer

Answer: A

Question 3

Which AES mode should be used in a Cisco SD-WAN environment that includes multicast applications?

A : Cipher Feedback (CFB)

B : Cipher Block Chaining (CBC)

C : Galois/Counter Mode (GCM)

D : Electronic Code Book (ECB)

Answer: C

Question 4

Which OSPF area blocks LSA Type 3, 4 and 5, but allows a default summary route?

A : normal

B : stub

C : NSSA

D : totally stubby

Answer: D

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

Answer: A

Page: 1 / 77

Total 381 Questions | Updated On: Jul 22, 2026

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