New DumpsTests 300-420 Exam Questions Real 300-420 Dumps Updated on Sep 22, 2026 [Q197-Q216]

300-420 Cisco

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New DumpsTests 300-420 Exam Questions| Real 300-420 Dumps Updated on Sep 22, 2026

300-420 Braindumps – 300-420 Questions to Get Better Grades

Cisco 300-420 Exam Syllabus Topics:

Section	Weight	Objectives
Software-Defined Access (SDA)	5%	– SD-Access architecture – Fabric design and deployment – Control plane and data plane design
Network Services	15%	– Multicast design – IP services 1. DHCP, DNS, NAT – Quality of Service (QoS) 1. Policing, shaping, congestion management 2. Classification and marking
Advanced Enterprise Campus Networks	25%	– Layer 2 campus design 1. Hierarchical architecture 2. VLAN and trunking design 3. Spanning Tree Protocol optimization – Layer 3 campus design 1. Routing in campus infrastructure 2. Virtualization and segmentation – Wireless integration
Advanced Addressing and Routing Solutions	25%	– IPv4 and IPv6 addressing design 1. Route summarization and aggregation 2. Structured addressing plans – Routing protocol design 1. OSPF design 2. EIGRP design 3. IS-IS design 4. Route redistribution and filtering
WAN for Enterprise Networks	20%	– VPN design 1. Site-to-site VPN 2. DMVPN, L2VPN, L3VPN – WAN connectivity options 1. MPLS, Metro Ethernet, 4G/5G 2. SD-WAN architecture and design – WAN resiliency and high availability
Security Services	10%	– Security architecture design 1. Threat defense integration 2. Network segmentation – Secure connectivity

Q197.

Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal.
Which design provides optimal routing between both networks when the link between routers C and E fails?

Move the link between routers C and D to area 10.

Create an OSPF virtual link between routers E and F.

Create a tunnel between routers E and F in area 10.

Make area 10 a not-so-stubby area.

Section: Advanced Addressing and Routing Solutions
Explanation/Reference:

Q198. An engineer must design a routing solution for a company that is single-homed to an ISP. The company’s goal is to run BGP between the CE and the PE devices. To support running BGP, the company obtained a public AS number and IP subnet from ARIN. Which solution must the engineer select?

– The customer announces the default route to the ISP.
– The ISP announces the default route to the customer.

– The customer announces the public IP subnet to the ISP.
– The ISP announces the BGP table to the customer.

– The ISP announces the customer public IP subnet.
– The ISP announces the partial BGP table to the customer.

– The customer announces the public IP subnet to the ISP.
– The ISP announces the default route to the customer.

Q199. Drag and drop the characteristics from the left onto the Yang model they describe on the right.
Select and Place:

Q200. An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?

IPFIX

static telemetry

on-change subscription

periodic subscription

Q201. An engineer uses Postman and YANG to configure a router with:
– OSPF process ID 100
– network 10.10.10.0/28 enabled for Area 0
Which get-config replay verifies that the model set was designed correctly?

Q202. A customer has several remote sites connected with their headquarters through microwave links. An engineer must propose a backup WAN solution based on these conditions:

Which backup WAN link type the engineer recommend?

LTE

802.16 WiMAX

Laser link

802.15.1 Bluetooth

Q203. What is the impact of the push model for monitoring devices on the network?

limited scale for real-time data access

real-time access to resource utilization

periodic polling of network resources and events

trigger notifications for data change utilization

In a push-based monitoring model, devices actively send real-time updates on their resource utilization and status to the monitoring system. This provides immediate visibility into network performance without waiting for periodic polling.

Q204. An engineer must design an addressing plan for a small business using a single /24 network. Each department must have its own subnet. Drag and drop the subnets from the left onto the departments requirements that they fulfill on the right. Not all options are used.

Q205. What does a hierarchical EIGRP design help with? (Choose two.)

Redistribution

Route summarization

Faster convergence

Load balancing

Q206. Refer to the exhibit. An engineer must design an automatic failover solution. The solution should allow HSRP to detect a WAN 1 failure and initiate an automatic failover, making router R2 the active HSRP router. Which two solutions should the engineer choose? (Choose two.)

Implement Enhanced Object Tracking on router R1

use a floating static route

Implement IP SLA on router R1

Implement PBR on router R1

use IP source routing

Q207.

Refer to the exhibit A customer requires maximum uptime for the data plane between R1 and R3 running OSPF Which solution must the design include for high availability if the routing process on R2 requires maintenance?

BFD on all routers

nonstop forwarding on R1 and R3

nonstop forwarding on R3 only

graceful restart on all routers

Graceful restart is the correct high-availability design when the routing process on an intermediate OSPF router must undergo maintenance while the data plane remains available. Cisco describes graceful restart as a mechanism that allows a restarting router to continue forwarding traffic while neighbors temporarily preserve adjacency and route information. In OSPF, helper-capable neighbors assist the restarting router by maintaining forwarding state during the restart interval, preventing unnecessary route withdrawal and reconvergence. BFD is a failure-detection mechanism, so it would actually accelerate detection of a failure rather than preserve the forwarding path during planned process maintenance. Nonstop forwarding must be enabled on the device performing the control-plane restart and supported by neighbors, but the broad answer choice that captures the required routing-protocol behavior across the design is graceful restart on the participating routers. Configuring it only on R1 and R3 or only on R3 would not support the R2 process maintenance scenario. Reference topics: OSPF graceful restart, NSF, helper mode, control-plane maintenance, data-plane availability.

Q208. Refer to the exhibit.

Refer to the exhibit. An architect is designing a BGP solution to connect a remote branch to a service provider. There are several prefixes within the branch that the company does not want to be advertised to the internet. Which solution should the architect use to accomplish this?

Set the BGP Internet community for all prefixes.

Implement the NOPEER community.

Use the BGP No-Advertise community for the prefixes to exclude.

Attach the No-Export community with the prefixes to exclude

Q209. During the integration of ISE and DNA Center, which of the following are used to establish trust through ISE?

REST APIs

pxGRID services

Scalable groups

SGACLs

Q210. A company is using OSPF between its HQ location and a branch office. HQ is assigned area 0 and the branch office is assigned area 1. The company purchases a second branch office, but due to circuit delays to HQ, it decides to connect the new branch office to the creating branch office as a temporary measure. The new branch office is assigned area 2. Which OSPF configuration enables all three locations to exchange routes?

The existing branch office must be configured as a stub area

A virtual link must be configured between the new branch office and HQ

A sham link must be configured between the new branch office and HQ

The new branch office must be configured as a stub area

Q211. How does OMP behave in a Cisco Catalyst SD-WAN architecture if no policy is defined?

to block all communication between WAN Edge routers

to allow a point-to-point topology for WAN Edge routers to communicate from the central location to remote locations

to allow all WAN Edge routers to communicate using a full mesh topology

to allow a hub and spoke topology for WAN Edge routers to communicate via the central location

In Cisco Catalyst SD-WAN, OMP (Overlay Management Protocol) by default enables a full mesh topology between all WAN Edge routers if no policy is defined, allowing direct communication among all sites.

Q212. Exhibit:

Refer to the exhibit. An engineer is designing a Layer 2 campus network. The design must support fast convergence and leverage as much bandwidth as possible between layers. Distribution switches do support VSS; unfortunately, not all routing protocols are available for use due to license limitations. Which solution must the engineer choose?

EtherChannel

MEC

RSTP

ECMP

Q213. Refer to the exhibit.

An architect must design an IPv6 migration solution for an enterprise customer to support these requirements:
* Clients will transition to the new IPv6 network, which provides NAT64 and IPv6 DNS resolution services, using the same DNS name that points to the IPv4 address.
* The service provider will create a client-facing IPv6 interface with a new IPv6 virtual address that points to the same IPv4 DNS server.
* The service provider will support clients that use global IPv6 addresses and encapsulate IPv4 packets into IPv6 tunnels.
Which two migration solutions must the architect choose? (Choose two.)

Use dual-stack lite from the MPLS network to the IGR.

Use IPv6 tunneling from the devices to the core MPLS network.

Use dual-stack lite from the devices to the core MPLS network.

Use NAT44/64 from the MPLS network to the IGR.

Use NAT44/64 from the devices to the core MPLS network.

Q214.

Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal.
Which design provides optimal routing between both networks when the link between routers C and E fails?

Move the link between routers C and D to area 10.

Create an OSPF virtual link between routers E and F.

Create a tunnel between routers E and F in area 10.

Make area 10 a not-so-stubby area.

Q215.

Refer to the exhibit. An architect is designing a Layer 3 campus network The design must hide network instability, reduce network overhead, and conserve critical device memory Which route summarization solution must the architect select?

* The core layer must advertise a default route toward the aggregation layer
* The VLAN subnets must be summarized into 10 0 0 0.’16 at the aggregation layer and advertised to the core layer

* The core layer must advertise a default route toward the aggregation layer
* The VLAN subnets must be summarized into 10 0 0 0/16 at the access layer and advertised to the aggregation layer

* The aggregation layer must advertise a default route toward the access layer.
* The VLAN subnets must be summarized into 10 0.0 0/16 at the aggregation layer and advertised to the core layer

* The aggregation layer must advertise a default route toward the core layer
* The VLAN subnets must be summarized into 10 0 0 0.116 at the aggregation layer and advertised to the access layer

Q216. An engineer is working with NETCONF and Cisco NX-OS based devices. The engineer needs a YANG model that supports a specific feature relevant only to Cisco NX-OS. Which model must the engineer choose?

Native

IEEE

OpenConfig

IETF

Explanation
https://github.com/YangModels/yang/tree/master/vendor/cisco
https://blogs.cisco.com/developer/which-yang-model-to-use

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