Free 300-420 Practice Test Questions 2026

Drag and drop the characteristics from the left onto the Yang model they describe on the right. Select and Place:

Refer to the exhibit.

An engineer is designing a routing solution for a customer. The design must ensure that a
failure of network
10.1.0.0/24, 10.1.2.0/24, 10.2.1.0/24, or 10.2.3.0/24 does not impact the core. It also
requires fast convergence
time during any link failover in the core or access networks. Which solution must the
engineer select?

A.

Add aggregation layer between core and access networks.

B.

Enable graceful restart on routers A and C.

C.

Enable FRR for the connected networks of routers A and C.

D.

Enable summarization on routers A and C.

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

Refer to the exhibit. The full EIGRP routing table is advertised throughout the network.
Currently, users experience data loss when any one link in the network fails. An architect
optimizes the network to reduce the impact when a link fails. Which solution should the
architect include in the design?

A.

Run BFD on the inter links between EIGRP neighbors.

B.

Summarize the access layer networks from each access layer switch toward the aggregation layer.

C.

Reduce the default EIGRP hello interval and hold time.

D.

Summarize the access layer networks from the aggregation layer toward the core layer.

An engineer is working for a large cable TV provider that requires multiple sources
streaming video on different channels using multicast with no rendezvous point. Which multicast protocol meets these requirements?

A.

PIM-SM

B.

PIM-SSM

C.

any-source multicast

D.

BIDIR-PIM

Which two techniques improve the application experience in a Cisco SD-WAN design? (Choose two.)

A.

utilizing forward error correction

B.

implementing a stateful application firewall

C.

implementing AMP

D.

utilizing quality of service

E.

implementing Cisco Umbrella

The customer solution requires QoS to support streaming multimedia over a WAN. An architect chooses to use Per-Hop Behavior. Which solution should the engineer use to of mark traffic traveling between branch sites?

A.

LLQ with DSCP EF

B.

CBWFQ with DSCP AF3

C.

CBWFQ with DSCP AF2

D.

LLQ with DSCP AF4

What is the purpose of a control plane node in a Cisco SD-Access network fabric?

A.

to maintain the endpoint database and mapping between endpoints and edge nodes

B.

to detect endpoints in the fabric and inform the host tracking database of EID-to-fabricedge node bindings

C.

to identify and authenticate endpoints within the network fabric

D.

to act as the network gateway between the network fabric and outside networks

Drag and drop the elements from the left onto the YANG models where they and used on the right.

Which two statements describe source trees in a multicast environment? (Choose two.)

A.

Source trees guarantee the minimum amount of network latency for forwarding
multicast traffic

B.

Source trees create an optimal path between the source and the receivers

C.

Source trees use a single common root placed at some chosen point in the
network

D.

Source trees can introduce latency in packet delivery

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?

A.

dual stack

B.

6VPE

C.

6to4

D.

NAT64

A customer's current Layer 2 infrastructure is running Spanning Tree 802.1d, and all
configuration changes are manually implemented on each switch. An architect must
redesign the Layer 2 domain to achieve these goals:
reduce the impact of topology changes
reduce the time spent on network administration
reduce manual configuration errors
Which two solutions should the architect include in the new design? (Choose two.)

A.

Implement Rapid PVST+ instead of STP.

B.

Implement MST instead of STP.

C.

Use VTP to propagate VLAN information and to prune unused VLANs.

D.

Configure broadcast and multicast storm control on all switches.

E.

Configure dynamic trunking protocol to propagate VLAN information.