[UPDATED 2025] Cisco 300-420 Questions Prepare with Free Demo of PDF
NEW 2025 Certification Sample Questions 300-420 Dumps & Practice Exam
Cisco 300-420 exam is a 90-minute test that consists of 60-70 multiple-choice questions, and it can be taken at any Pearson VUE testing center worldwide. 300-420 exam is available in English and Japanese language versions. Candidates must score at least 750 out of 1000 points to pass the exam.
Cisco 300-420 certification exam is a challenging test that requires a significant amount of preparation and study. Candidates must have a solid understanding of Cisco enterprise network design principles, concepts, and best practices. They must also have a deep understanding of the latest networking technologies and trends, including software-defined networking (SDN), network automation, and network programmability.
NEW QUESTION # 29
When designing interdomain multicast, which two protocols are deployed to achieve communication between multicast sources and receivers? (Choose two.)
- A. MLD
- B. MSDP
- C. IGMPv2
- D. MP-BGP
- E. BIDIR-PIM
Answer: B,D
Explanation:
Section: Network Services
NEW QUESTION # 30
Refer to the exhibit.
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 NSR on the switch.
- B. Enable NSF on the switch.
- C. Configure ISIS aggressive timers on both devices.
- D. Enable IS-IS remote LFA FRR on both devices.
Answer: B
NEW QUESTION # 31
Which two BGP features will result in successful route exchanges between eBGP neighbors sharing the same AS number? (Choose two.)
- A. as-override
- B. bestpath as-path ignore
- C. advertise-best-external
- D. allow-as-in
- E. client-to-client reflection
Answer: A,D
Explanation:
Section: Advanced Addressing and Routing Solutions
NEW QUESTION # 32
Which consideration must be made when designing a Cisco SD-Access fabric underlay?
- A. Up to six control planes are supported.
- B. A unified policy must be used.
- C. The default MTU should be increased.
- D. Subnets must be reduced to decrease latency.
Answer: C
Explanation:
VXLAN adds 50 bytes to the original packet. The common denominator and recommended MTU value available on devices operating in a fabric role is 9100. Network should have a minimum starting MTU of at least 1550 bytes to support the fabric overlay. MTU values between 1550 and
9100 are supported along with MTU values larger than 9100 though there may be additional configuration and limitations based on the original packet size.
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
NEW QUESTION # 33
A company must automate a set of complex changes aligned with DR testing in the network. These changes are specific, and the DR playbook will be adjusted in the future. The playbook has diverse routing and switching assets in scope as well as multiple vendor and hardware platforms. A developer will create a thin, web front-end microservice and integrate with an Open daylight controller to push changes to the network. Which YANG model should be used?
- A. Use an open YANG model to allow the reuse of code and standardize the implementation across platforms
- B. Develop an individualized YANG model to minimize development resources and time to market.
- C. Use a single native vendor YANG model to minimize development time
- D. Use multiple native vendor YANG models to provide code consistency.
Answer: A
NEW QUESTION # 34
When differentiating between IETF. OpenConfig. and Cisco native YANG models, how does the use of containers differ?
- A. IETF and Cisco native models use one container for operational data and another container for configuration data, and OpenConfig uses a single container for operational data and configuration data.
- B. IETF and Cisco native models use a single container for operational data and configuration data, and OpenConfig uses one container for operational data and another container for configuration data.
- C. Cisco native models use one container for operational data and another container for configuration data, and OpenConfig and IETF use a single container for operational data and configuration data.
- D. OpenConfig uses one container for operational data and another container for configuration data, and IETF and Cisco native models use a single container for operational data and configuration data.
Answer: B
NEW QUESTION # 35
Which feature must be incorporated into the campus LAN design to enable Wake on LAN?
- A. dynamic ARP Inspection Snooping on layer 2 devices
- B. DHCP Snooping on layer 2 devices
- C. directed broadcasts on layer 3 devices
- D. proxy ARP on layer 3 devices
Answer: C
Explanation:
Section: Advanced Enterprise Campus Networks
NEW QUESTION # 36
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 Enhanced Object Tracking on router R1
- B. use a floating static route
- C. Implement PBR on router R1
- D. Implement IP SLA on router R1
- E. use IP source routing
Answer: A,D
NEW QUESTION # 37 
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. stateless NAT66
- B. stateful NAT64
- C. stateful NAT66
- D. stateless NAT64
Answer: B
NEW QUESTION # 38
A network engineer must design an MSDP multicast solution to provide RP resilience in a network with two separate domains. Also, multicast sources and receivers must register with the local RP. Which solution must the engineer choose?
- A. Configure the RP has value to 0, and traffic will route to the closest RP
- B. Configure the RP group ranges to split the multicast traffic, and traffic will route to the longest match
- C. Configure the RP priority with the same value, and traffic will route to the closest RP
- D. Configure the RP loopback interface with the same IP address/32, and traffic will route to the closest RP
Answer: D
Explanation:
Two or more RPs are configured with the same IP address (for example, 10.0.0.1) on loopback interfaces. The loopback address should be configured with a 32-bit mask. All the downstream routers are configured so that they know that 10.0.0.1 is the IP address of their local RP. IP routing automatically selects the topologically closest RP for each source and receiver.
https://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/Phase_1/mcstmsdp/mcst_ p1.html
NEW QUESTION # 39 
Refer to the exhibit. An architect must design a solution to connect bank site A with bank site B and support:
* network operation center monitoring end-to-end L3VPN and L2VPN traffic
* company adding thousands of routes in the next two years
Which two BGP solutions must the design include? (Choose two.)
- A. Connect multiple IGP'LDP domains using a BGP IPv4 unicast family on the ABR.
- B. Transport site routes using a BGP VPNv4 address family on the PE routers.
- C. Apply BGP policies on all routers to filter out ABR and PE loopback IP addresses.
- D. Redistribute different IGP domain routes in a BGP IPv4 routing instance.
- E. Establish full mesh IBGP peering with ail routers in different IGP domains.
Answer: B,E
NEW QUESTION # 40
Drag and drop the characteristics from the left onto the Yang model they describe on the right.
Select and Place:
Answer:
Explanation:
NEW QUESTION # 41
Refer to the exhibit. A network engineer is designing an OSPF solution to connect a company's remote to a newly provisioned MPLS VPN backbone. Some of the branches have a direct dark fiber connection between each other. The engineer wants to ensure that the dark fibers are used only when the MPLS core is unavailable.
Which solution must the engineer choose?
- A. NSSA
- B. Virtual link
- C. Stub area
- D. Sham link
Answer: D
Explanation:
Explanation
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16/iro-xe-16-book/iro-sham-lin
NEW QUESTION # 42
Drag and drop the characteristics from the left onto the correct telemetry mode on the right.
Answer:
Explanation:
Explanation
In a dial-in mode, the destination initiates a session to the router and subscribes to data to be streamed. Dialin 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.
NEW QUESTION # 43
When designing interdomain multicast, which two protocols are deployed to achieve communication between multicast sources and receivers? (Choose two.)
- A. MLD
- B. MSDP
- C. IGMPv2
- D. MP-BGP
- E. BIDIR-PIM
Answer: B,D
Explanation:
MSDP (Multicast interdomain discovery protocol) should exchange routing information using BGP.
NEW QUESTION # 44
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. GET VPN
- B. IPsec
- C. DMVPN
- D. VPLS
Answer: C
NEW QUESTION # 45
An architect must address sustained congestion on the access and distribution uplink of network.
QoS has already been implemented and optimized, but it is no longer effective in ensuring optimal network performance.
Which two solutions should the architect use to improver network performance? (Choose two)
- A. Reconfigure QoS based on the IntServ model
- B. Implement higher-speed uplink interfaces
- C. Utilize random early detection to manage queues
- D. Configure selective packet discard to drop noncritical network traffic.
- E. Bundle additional uplinks into logical EtherChannels
Answer: B,E
NEW QUESTION # 46
How do IETF. OpenConfig and Cisco nativo YANG models differ when used to configuro the same feature on an infrastructure device?
- A. OpenConfig models are more comprehensive than IETF.
- B. Cisco native models are less comprehensive than IETF.
- C. IETF models are more comprehensive than OpenConfig.
- D. Cisco native models are less comprehensive than OpenConfig.
Answer: A
NEW QUESTION # 47
Drag and drop the characteristics from the left onto the Yang model they describe on the right.
Select and Place:
Answer:
Explanation:
NEW QUESTION # 48
Drag and Drop Question
Drag and drop the model driven telemetry characteristics from the left onto the mode they belong to on the right.
Answer:
Explanation:
NEW QUESTION # 49
Refer to the exhibit.
A customer is running HSRP on the core routers. Over time the company has grown and requires more network capacity. In the current environment, some of the downstream interfaces are almost fully utilized, but others are not. Which solution improves the situation?
- A. Make router R2 active for half of the VLANs.
- B. Configure port channel toward downstream switches.
- C. Add more interfaces to R1 and R2.
- D. Enable RSTP on the downstream switches.
Answer: A
NEW QUESTION # 50
What is the purpose of a control plane node in a Cisco SD-Access network fabric?
- A. to act as the network gateway between the network fabric and outside networks
- B. to detect endpoints in the fabric and inform the host tracking database of EID-to-fabric-edge node bindings
- C. to maintain the endpoint database and mapping between endpoints and edge nodes
- D. to identify and authenticate endpoints within the network fabric
Answer: C
Explanation:
Endpoint registration-Each edge node has a LISP control-plane session to all control plane nodes. After an endpoint is detected by the edge node, it is added to a local database called the EID-table. Once the host is added to this local database, the edge node also issues a LISP map- register message to inform the control plane node of the endpoint so the central HTDB is updated.
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
NEW QUESTION # 51
An engineer must design a QoS solution for a customer that is connected to an ISP over a 1Gbps link with a 100Mbps CIR. The ISP aggressively drops all traffic received over which is causing numerous TCP retransmissions. The customer is not using any RTP applications but wants to maximize bandwidth usage up to the CIR. Which QoS solution engineer choose?
- A. Queuing
- B. Traffic shaping
- C. Policing
- D. Policer with markdown
Answer: C
Explanation:
https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html
NEW QUESTION # 52
Refer to the exhibit.
Refer to the exhibit. An architect reviews the low-level design of a company's enterprise network and advises optimizing the STP convergence time. Which functionality must be to Gi1/0/1-10 to follow the architect's recommendation?
- A. BPDU guard
- B. root guard
- C. PortFast
- D. UplinkFast
Answer: C
NEW QUESTION # 53
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