Current 300-420 Exam Dumps [2025] Complete Cisco Exam Smoothly
300-420 Premium PDF & Test Engine Files with 377 Questions & Answers
NEW QUESTION # 71
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. Stub area
- B. Sham link
- C. Virtual link
- D. NSSA
Answer: B
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 # 72
An architect must design a QoS model for a business-critical application that is delay-sensitive and requires high bandwidth. The company's head office hosts the application, and DMVPN tunnels protected with IPsec provide connectivity between the head office and branches. Which solution must the architect choose?
- A. RSVP
- B. IntServ
- C. DiffServ
- D. WRED
Answer: A
NEW QUESTION # 73
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. PortFast
- B. root guard
- C. BPDU guard
- D. UplinkFast
Answer: A
Explanation:
PortFast is a spanning tree's functionality, once configured it avoids the STP states (blocking, listening, learning, forwarding) every time any port among Gi1/0/1 Gi1/0/10 is connected again.
NEW QUESTION # 74
Which three feature sets are used in Stackwise technology? (Choose three.)
- A. LAN Agent
- B. IP Base
- C. WAN Services
- D. IP Services
- E. LAN Base
- F. ARP Base
Answer: B,D,E
NEW QUESTION # 75
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.
Answer:
Explanation:
NEW QUESTION # 76
An engineer must propose a QoS architecture model that allows an application to inform the network of its traffic profile and to request a particular type of service to support its bandwidth and delay requirements. The application requires consistent and dedicated bandwidth end to end. Which QoS architecture model meets these requirements?
- A. IntServ
- B. DiffServ
- C. WRED
- D. LLQ
Answer: A
Explanation:
Section: Network Services
NEW QUESTION # 77
Drag and drop the properties from the left onto the protocols they describe on the right.
Answer:
Explanation:
Reference:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/166/b_166_programmability_cg/ b_166_programmability_cg_chapter_01011.html
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/169/b_169_programmability_cg/ configuring_yang_datamodel.html
NEW QUESTION # 78
An engineer is creating a design to enable IPv6 to run on an existing IPv4 IS-IS network. The IPv4 and IPv6 topologies will match exactly, and the engineer plans to use the same router levels for each protocol per interface. Which IS-IS design is required?
- A. single topology with transition feature enabled
- B. multi topology without enabling transition feature
- C. single topology without enabling transition feature
- D. multi topology with transition feature enabled
Answer: D
Explanation:
Explanation
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/15-mt/irs-15-mt-book/ip6-route-mu
NEW QUESTION # 79
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. A fabric edge is used to de-encapsulate VXLAN traffic to normal IP traffic then transported over the outside network
- C. Fabric borders use VRFs to map VNs to VRFs
- D. SD-Access transit links are used to transport encapsulated traffic from one fabric to another
Answer: C
Explanation:
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
NEW QUESTION # 80
Refer to the exhibit. An engineer working for a telecommunication company with an employee ID:
1234:56:789 is calculating STP scalability for switches to ensure that the numbers are below the maximum supported value for STP logical ports. How many logical interfaces are active for switch A?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
When designing a large data center using extended Layer 2 VLAN topologies, it is necessary to calculate the spanning tree logical and virtual ports in advance to ensure that spanning tree operates with optimal convergence and stability characteristics.
trunks on the switch * active VLANs on trunks + number of non-trunking interfaces on the switch
2 Trunks * 100 Vlans + 2 = 202 Active Logical Interfaces
NEW QUESTION # 81
Refer to the exhibit. Due to budget constraints, a customer decided to purchase WAN routers with one LAN and one WAN interface per device. There is a requirement to connect the three sites to ensure high availability without buying additional WAN links. Which design deployment must the customer choose?
- A. dual-homed full mesh
- B. single-homed full mesh
- C. dual-homed hub-and-spoke
- D. single-homed hub-and-spoke
Answer: D
NEW QUESTION # 82
A customer is undergoing a WAN re-architecture and wants to design QoS policies for remote sites that have low bandwidth. What must be considered to have CBWFQ configured in the parent and child policies in an end-to-end QoS design?
- A. CBWFQ is only supported in the child policy.
- B. CBWFQ is only supported in the parent policy.
- C. Traffic shaping is required in the parent policy.
- D. Traffic policing is required in the child policy.
Answer: C
NEW QUESTION # 83
Drag and drop the characteristics from the left onto the YANG models they describe on the right. Not all options are used.
Answer:
Explanation:
NEW QUESTION # 84
In a simple MPLS L3VPN, which two tasks are performed by the PE router? (Choose two.)
- A. It exchanges VPNv4 and VPNv6 routes with CE Devices.
- B. It establishes pseudo wires with other PEs.
- C. It assigns labels to routes in individual VPNs.
- D. It forwards labeled packets to CE devices.
- E. It exchanges VPNv4 or VPNv6 route with other PE routers.
Answer: C,E
NEW QUESTION # 85
A customer reports that each time a networking component fails, OSPF recalculates the backup path, with causes a short outage. Which solution must the customer implement to improve this situation?
- A. BFD
- B. Aggressive OSPF timers
- C. LFA FRR
- D. Incremental SPF
Answer: C
Explanation:
OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR) allows OSPF to quickly switch (within 50 ms) to a backup path when a primary path fails. Without LFA FRR, OSPF has to re-run SPF to find a new path when the primary path fails. With LFA FRR, OSPF pre-computes a backup path and installs the backup next hop in the forwarding table.
https://networklessons.com/cisco/ccie-routing-switching-written/ospf-loop-free-alternate-lfa-fast- reroute-frr
NEW QUESTION # 86
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. dynamic NAT-PT
- B. stateless NAT66
- C. static NAT-PT
- D. stateful NAT66
Answer: A
NEW QUESTION # 87 
Refer to the exhibit. An engineer Is designing a redistribution solution for a customer. The customer recently acquired another company and decided to integrate the new network running RlPv1 with the company's existing network. Which redistribution technique must the engineer select to ensure the multipoint two-way redistribution does not cause routing loops?
- A. distribute-lists outbound under the RIPv1 process denying EIGRP learned prefixes
- B. distribute-lists outbound under the EIGRP process denying RIPv1 learned prefixes
- C. distribute-lists inbound under the EIGRP process denying RIPv1 learned prefixes
- D. distribute-lists inbound under the RIPv1 process denying EIGRP learned prefixes
Answer: A
NEW QUESTION # 88
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