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300-420 Mock Test Free

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  • 300-420 Mock Test Free – 50 Realistic Questions to Prepare with Confidence.
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300-420 Mock Test Free – 50 Realistic Questions to Prepare with Confidence.

Getting ready for your 300-420 certification exam? Start your preparation the smart way with our 300-420 Mock Test Free – a carefully crafted set of 50 realistic, exam-style questions to help you practice effectively and boost your confidence.

Using a mock test free for 300-420 exam is one of the best ways to:

  • Familiarize yourself with the actual exam format and question style
  • Identify areas where you need more review
  • Strengthen your time management and test-taking strategy

Below, you will find 50 free questions from our 300-420 Mock Test Free resource. These questions are structured to reflect the real exam’s difficulty and content areas, helping you assess your readiness accurately.

Question 1

Refer to the exhibit.
 Image
A network engineer must improve the current IS-IS environment. The Catalyst switch is equipped with dual supervisors. Each time a stateful switchover occurs, the network experiences unnecessary route recomputation. Which solution addresses this issue if the upstream router does not understand graceful restart messaging?

A. Enable IS-IS remote LFA FRR on both devices.

B. Enable NSR on the switch.

C. Enable NSF on the switch.

D. Configure ISIS aggressive timers on both devices.

 


Suggested Answer: C

 

Question 2

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

A. nonbroadcast multiaccess

B. multiaccess

C. point-to-multipoint

D. nonbroadcast

E. point-to-point

 


Suggested Answer: BE

 

Question 3

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

 


Suggested Answer: A

 

Question 4

DRAG DROP -
Drag and drop the functions from the left onto the Cisco SD-WAN components that perform them on the right.
Select and Place:
 Image

 


Suggested Answer:
Correct Answer Image

 

Question 5

How is redundancy achieved among Cisco vBond Orchestrators in a Cisco SD-WAN deployment?

A. The IP addresses of all Orchestrators are mapped to a single DNS name.

B. The closest Orchestrator to each Cisco WAN Edge router is selected.

C. Cisco WAN Edge routers are configured with all Orchestrators using their IP addresses and priority.

D. A single Cisco Orchestrator is deployed in each network.

 


Suggested Answer: A

Reference:
https://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise-networks/sd-wan/nb-06-cisco-sd-wan-ebook-cte-en.pdf
page 25

Question 6

Which function does the Cisco SD-Access intermediate node perform?

A. Act as an anycast Layer 3 gateway.

B. Map users to a virtual network.

C. Route and transport IP traffic.

D. Act as LISP proxy tunnel router.

 


Suggested Answer: C

 

Question 7

Which topology within a network underlay eliminates the need for first hop redundancy protocols while improving fault tolerance, increasing resiliency, and simplifying the network?

A. virtualized topology

B. routed access topology

C. Layer 2 topology

D. logical fabric topology

 


Suggested Answer: D

 

Question 8

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 classify and mark traffic traveling between branch sites?

A. CBWFQ with DSCP AF2

B. LLQ with DSCP EF

C. CBWFQ with DSCP AF3

D. LLQ with DSCP AF4

 


Suggested Answer: B

 

Question 9

DRAG DROP -
Drag and drop the descriptions from the left onto the corresponding WAN connectivity types and categories on the right.
Select and Place:
 Image

 


Suggested Answer:
Correct Answer Image

 

Question 10

Image
Refer to the exhibit. An engineer is designing a multicampus Layer 3 infrastructure using EIGRP as the routing protocol. The design must provide quick replies to queries in the event of a downlink, prevent unnecessary queries, and ensure that traffic does not unnecessarily transit the access layer. Which two actions must the engineer take for the network design? (Choose two.)

A. Configure core layer switches as stub routers.

B. Configure access layer and core layer switches as stub routers.

C. Configure distribution layer switches to summarize routes to the core layer.

D. Configure access layer switches as stub routers.

E. Configure access layer switches to summarize routes to the distribution layer.

 


Suggested Answer: DE

 

Question 11

Image
Refer to the exhibit. An engineer must connect the IPv6 island to the IPv4-only network to provide IPv6 hosts access to file servers and DNS services in the IPv4 network. Which NAT should the engineer choose?

A. stateless NAT66

B. stateful NAT66

C. dynamic NAT-PT

D. static NAT-PT

 


Suggested Answer: D

 

Question 12

DRAG DROP -
Drag and drop the characteristics from the left onto the telemetry mode they apply to on the right.
Select and Place:
 Image

 


Suggested Answer:
Correct Answer Image

In a dial-in mode, the destination initiates a session to the router and subscribes to data to be streamed. Dial-in mode is supported over gRPC in only 64-bit platforms.
In a dial-out mode, the router initiates a session to the destinations based on the subscription. All 64-bit IOS XR platforms (except for NCS 6000 series routers) support gRPC and TCP protocols. All 32-bit IOS XR platforms support only TCP.
Reference:
https://www.cisco.com/c/en/us/td/docs/iosxr/asr9000/telemetry/b-telemetry-cg-asr9000-61x/b-telemetry-cg-asr9000-61x_chapter_010.html#id_36445

Question 13

Refer to the exhibit.
 Image
An engineer is designing a hierarchical ISIS solution for an enterprise customer with these requirements:
•	Users in areas 25 and 55 send and receive traffic from both backbone areas.
•	Link flaps in areas 35 and 45 must not impact other areas.
•	Routers will double within the next 12 months in areas 35 and 45.
Which design must the engineer select?

A. A series routers Level 2, B series routers Level 2, and C series routers Level 1

B. A series routers Level 1/2, B series routers Level 1/2, and C series routers Level 1/2

C. A series routers Level 1/2, B series routers Level 2, and C series routers Level 2

D. A series routers Level 1, B series routers Level 1/2, and C series routers Level 2

 


Suggested Answer: D

 

Question 14

Image
Refer to the exhibit. Which two solutions maximize the use of the links between the core and distribution layers? (Choose two.)

A. use multiple equal-cost links

B. use an IGP

C. use HSRP

D. use RPVSTP+

E. use multiple unequal-cost links

 


Suggested Answer: AB

 

Question 15

A network engineer must connect two sites across a public network using a secure tunneling technology that supports multicast traffic. Which technology should be selected?

A. IPsec

B. GRE

C. PPTP

D. GRE over IPsec

 


Suggested Answer: D

 

Question 16

Which two activities should occur during an SE’s demo process? (Choose two.)

A. asking the customer to provide network drawings or white board the environment for you.

B. highlighting opportunities that although not currently within scope would result in lower operational costs and complexity.

C. identifying which capabilities require demonstration.

D. determining whether the customer would like to dive deeper during a follow-up.

E. leveraging a company such as Complete Communications to build a financial case.

 


Suggested Answer: BD

 

Question 17

Image
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.)

A. implement IP SLA on router R1

B. implement PBR on router R1

C. implement Enhanced Object Tracking on router R1

D. use IP source routing

E. use a floating static route

 


Suggested Answer: AC

 

Question 18

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

 


Suggested Answer: DE

 

Question 19

Image
Refer to the exhibit. An architect must create a stable and scalable EIGRP solution for a customer. The design must:
✑ conserve bandwidth, memory, and CPU processing
✑ prevent suboptimal routing
avoid any unnecessary queries
 Image
Which two solutions must the architect select? (Choose two.)

A. route summarization

B. prefix lists

C. distribute lists

D. stub routing

E. static redistribution

 


Suggested Answer: AC

 

Question 20

Which two statements describes Cisco SD-Access? (Choose two.)

A. software-defined segmentation and policy enforcement based on user identity and group membership

B. an overlay for the wired infrastructure in which traffic is tunneled via a GRE tunnel to a mobility controller for policy and application visibility

C. an automated encryption/decryption engine for highly secured transport requirements

D. programmable overlays enabling network virtualization across the campus

E. a collection of tools and applications that are a combination of loose and tight coupling

 


Suggested Answer: AD

 

Question 21

An engineer uses Postman and YANG to configure a router with:
✑ OSPF process ID 200
✑ network 172.16.10.128/26 enabled for Area 0
Which get-config reply verifies that the model set was designed correctly?
A.
 Image
B.
 Image
C.
 Image
D.
 Image

 


Suggested Answer: A

 

Question 22

Image
Refer to the exhibit. The failover time of ISP-2 is significantly shorter than ISP-1 when an interface on the ISP router toward the campus network fails. Which solution minimizes the downtime to the sub-second?

A. Aggressive timers

B. Next-hop address tracking

C. Graceful-restart

D. BFD

 


Suggested Answer: B

 

Question 23

How do endpoints inside an SD-Access network reach resources outside the fabric?

A. a VRF fusion router is used to map resources in one VN to another VN

B. Fabric borders use VRFs to map VNs to VRFs

C. SD-Access transit links are used to transport encapsulated traffic from one fabric to another

D. A fabric edge is used to de-encapsulate VXLAN traffic to normal IP traffic then transported over the outside network

 


Suggested Answer: D

 

Question 24

An engineer must design a QoS solution for a customer. The network currently supports data only, but the customer will roll out VoIP and IP video in conjunction with the new QoS solution. The engineer plans to use DiffServ. To ensure priority for voice services, which model must the design include?

A. 8-class model

B. 4-class model

C. 6-class model

D. 12-class model

 


Suggested Answer: A

 

Question 25

Which routes does the overlay management protocol advertise in an SD-WAN overlay?

A. underlay, MPLS, and overlay

B. primary, backup, and load-balanced

C. prefix, TLOC, and service

D. Internet, MPLS, and backup

 


Suggested Answer: C

 

Question 26

Which Cisco product were incorporated into Cisco ISE between ISE releases 2.0 and 2.3?

A. Cisco ESA

B. Cisco ASA

C. Cisco ACS

D. Cisco WSA

 


Suggested Answer: C

 

Question 27

A company uses cloud-based applications for voice and video calls, file sharing, content sharing, and messaging. During business hours, these applications randomly become slow and unresponsive. However, other applications work smoothly with the current applied QoS polices. Which solution must the company choose to resolve the issue?

A. Identify the applications with NBAR2 and allocate the required bandwidth accordingly.

B. Identify the port used by each application and apply a minimum bandwidth guarantee.

C. Identify the applications and reserve the required bandwidth on the perimeter routers.

D. Identify the application ports, create groupings, and rate-limit the required bandwidth.

 


Suggested Answer: B

 

Question 28

Which are the three focus areas for reinventing the WAN? (Choose three.)

A. Execution

B. Centralized device authentication

C. Secure Elastic Connectivity

D. Application Quality of Experience

E. Cloud First

F. Operations

 


Suggested Answer: CDE

 

Question 29

Image
Refer to the exhibit. An architect is developing a solution to consolidate networks while retaining device redundancy. The routing protocol for the WAN routers must be open standard, ensure high availability, and provide the fastest convergence time. Which solution must the design include?

A. both routers running EIGRP

B. one router running OSPFv2 and other OSPF v3

C. one router running ISIS and other OSPF v3

D. both routers running OSPFv2

 


Suggested Answer: A

 

Question 30

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

A. Electronic Code Book (ECB)

B. Cipher Feedback (CFB)

C. Cipher Block Chaining (CBC)

D. Galois/Counter Mode (GCM)

 


Suggested Answer: D

 

Question 31

An existing network solution is using BFD in echo mode. Several network devices are experiencing high CPU utilization, which an engineer has determined is related to the BFD feature. Which solution should the engineer leverage to reduce the CPU load?

A. Implement slow timers between peers with low CPU resources.

B. Implement BFD asynchronous mode between peers with low CPU resources.

C. Enable BFD multi-hop on the devices with low CPU resources.

D. Utilize carrier delay on all routers in the network.

 


Suggested Answer: A

 

Question 32

An engineer is designing a campus network with Cisco Catalyst 9500 switches in the aggregation layer. The design requires running nonblocking Layer 2 MEC from the aggregation layer to the access layer. The Catalyst switches are located on different campus floors for availability reasons, and each access switch will contain a single VLAN. Which technology must the engineer choose for the aggregation switches in the design?

A. VSS

B. StackWise-480

C. VPC

D. StackWise Virtual

 


Suggested Answer: D

 

Question 33

A network engineer must design a multicast solution to prevent the spoofing of multicast streams and ensure efficient bandwidth utilization. The network will be merged with another multicast domain in the future, and the merge must require minimum effort. Which two solutions meet the customer requirements? (Choose two.)

A. PIM-SSM

B. IGMPv3

C. IGMPv2

D. PIM-SM

E. MSDP

 


Suggested Answer: AB

 

Question 34

Image
Refer to the exhibit. A network engineer must design a BGP solution based on:
• The route reflector must have one or more direct physical connections to the core routers (R3 and R4).
• The route reflector must have full redundancy and avoid a single point of failure.
• R2 to R1 link utilization is 90%, and the remaining links are less than 50% utilized.
Which two solutions must the design include? (Choose two.)

A. Configure R1 to be a client of R2 and R4.

B. Configure R5 to be a client of R3 and R4

C. Configure R2 to be a client of R1 and R4.

D. Configure R3 to be a client of R2 and R4.

E. Configure R4 to be a client of R1 and R3.

 


Suggested Answer: AD

 

Question 35

A customer plans to adopt distributed QoS in their enterprise WAN. The policy must allow for individual packet marking according to the type of treatment required and for forwarding based on hop-by-hop treatment locally defined on each device. Which technology must the customer select?

A. CBWFQ

B. LLQ

C. Diffserv

D. IntServ

 


Suggested Answer: C

 

Question 36

Which two best practices must be followed when designing an out-of-band management network? (Choose two.)

A. Enforce access control

B. Facilitate network integration

C. Back up data using the management network

D. Ensure that the management network is a backup to the data network

E. Ensure network isolation

 


Suggested Answer: AE

 

Question 37

A large chain of stores currently uses MPLS-based T1 lines to connect their stores to their data center. An architect must design a new solution to improve availability and reduce costs while keeping these considerations in mind:
✑ The company uses multicast to deliver training to the stores.
✑ The company uses dynamic routing protocols and has implemented QoS.
✑ To simplify deployments, tunnels should be created dynamically on the hub when additional stores open.
Which solution should be included in this design?

A. VPLS

B. GET VPN

C. DMVPN

D. IPsec

 


Suggested Answer: C

 

Question 38

Image
Refer to the exhibit. An engineer must optimize the traffic flow of the network. Which change provides a more efficient design between the access layer and the distribution layer?

A. Add a link between access switch A and access switch B

B. Reconfigure the distribution switch A to become the HSRP Active

C. Change the link between distribution switch A and distribution switch B to be a routed link

D. Create an EtherChannel link between distribution switch A and distribution switch B

 


Suggested Answer: B

 

Question 39

Which component is part of the Cisco SD-Access overlay architecture?

A. border node

B. spine node

C. leaf node

D. Cisco DNA Center

 


Suggested Answer: D

 

Question 40

A customer requests a VPN solution to connect multiple sites with the company headquarters. All the sites use the same IP subnet. The engineer plans to use
VPLS. Which solution must the engineer include in the design?

A. different VLANs on each site

B. address translation to hide overlapping subnets

C. 802.1Q connectivity on the LAN side of the CE

D. route exchange with the service provider

 


Suggested Answer: C

 

Question 41

An engineer is designing a multicast network for a financial application. Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better scale routing tables, the design must not use source trees. Which multicast protocol satisfies these requirements?

A. PIM-SSM

B. PIM-SM

C. MSDP

D. BIDIR-PIM

 


Suggested Answer: B

 

Question 42

Refer to the exhibit.
 Image
A network engineer is designing a network for AS100. The design should ensure that all traffic enters AS100 via link 1 unless there is a network failure. In the event of a failure, link 2 should function as the path for incoming traffic. Which solution should the design include?

A. Modify the next-hop attribute on R3.

B. Use AS-Path prepending on R3.

C. Modify the next-hop attribute on R4.

D. Use AS-Path prepending on R4.

 


Suggested Answer: D

 

Question 43

DRAG DROP
-
Drag and drop the descriptions from the left onto the categories they apply to on the right.
 Image

 


Suggested Answer:
Correct Answer Image

 

Question 44

An organization plans to deploy multicast across two different autonomous systems. Their solution must allow RPs to:
✑ discover active sources outside their domain
✑ use the underlying routing information for connectivity with other RPs
✑ announce sources joining the group
Which solution supports these requirements?

A. SSM

B. MSDP

C. PIM-DM

D. PIM-SM

 


Suggested Answer: B

Reference:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9500/software/release/16-10/configuration_guide/ip_mcast_rtng/
b_1610_ip_mcast_rtng_9500_cg/b_1610_ip_mcast_rtng_9500_cg_chapter_010001.pdf

Question 45

Image
Refer to the exhibit. An engineer is planning an IPv4 to IPv6 migration solution for a customer. The routers in the network can support IPv4 and IPv6, except for the DWDM routers. The DWDM routers provide a Layer 2 link in which the routers peer directly with each other across a DWDM circuit. The circuit also provides connectivity between the mail servers. Which IPv6 migration technique must the engineer deploy?

A. ISATAP

B. dual-stack

C. 6to4

D. 6rd

 


Suggested Answer: B

 

Question 46

Image
Refer to the exhibit. An engineer must design an address translation solution to provide internet connectivity for the corporate network. The design is restricted to the 172.16.168.0/22 subnet. Which solution must the engineer choose?

A. stateful NAT66

B. stateless NAT64

C. stateless NAT66

D. stateful NAT64

 


Suggested Answer: B

 

Question 47

Which Cisco vEdge router offers 20 Gb of encrypted throughput?

A. Cisco vEdge 2000

B. Cisco vEdge 100

C. Cisco vEdge 5000

D. Cisco vEdge 1000

 


Suggested Answer: C

 

Question 48

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

 


Suggested Answer: A

 

Question 49

DRAG DROP -
An engineer is designing 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 requirements of the department they fulfill on the right. Not all options are used.
Select and Place:
 Image

 


Suggested Answer:
Correct Answer Image

 

Question 50

Refer to the exhibit.
 Image
Which two points in the network must an engineer configure the ports for explicit trust when using a DiffServ model?

A. B and E

B. F and G

C. A and D

D. C and D

 


Suggested Answer: B

 

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