Cisco 300-420 Practice Exams
Last updated on Mar 31,2025- Exam Code: 300-420
- Exam Name: Designing Cisco Enterprise Networks (ENSLD)
- Certification Provider: Cisco
- Latest update: Mar 31,2025
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
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-fabric-edge 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
A network engineer must segregate three interconnected campus networks using IS-IS routing. A two-layer hierarchy must be used to support large routing domains and to avoid more specific routes from each campus network being advertised to other campus network routers automatically.
Which two actions does the engineer take to accomplish this segregation? (Choose two.)
- A . Designate two IS-IS routers as BDR routers at the edge of each campus, and configure one BDR for all Level 1 routers and one BDR for all Level 2 routers.
- B . Designate two IS-IS routers from each campus to act as Level 1/Level 2 backbone routers at the edge of each campus network.
- C . Assign the same IS-IS NET value for each campus, and configure internal campus routers with Level 1/ Level 2 routing.
- D . Utilize different MTU values for each campus network segment. Level 2 backbone routers must utilize a larger MTU size of 9216.
- E . Assign a unique IS-IS NET value for each campus, and configure internal campus routers with Level 1 routing.
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
Which two solutions must the architect select? (Choose two.)
- A . route summarization
- B . prefix lists
- C . distribute lists
- D . stub routing
- E . static redistribution
How is internet access provided to a WAN edge router that is connected to a MPLS transport link?
- A . OMP advertises a default route from a WAN Edge router that is connected to the MPLS and internet transport networks
- B . Internet access must be provided at the WAN Edge router through either a 4G/5G link or local Internet circuit
- C . An extranet must be provided in the MPLS transport network to allow private traffic to reach the public internet
- D . TLOC extensions are used to route traffic to a WAN Edge router that is connected to the Internet transport network
An engineer is designing a network for a customer running a wireless network with a common VLAN for all APs. The customer is experiencing unicast flooding in the Layer 2 network between the aggregation and access layers. The customer wants to reduce the flooding and improve convergence time.
Which solution meets these requirements?
- A . Migrate all APs to a common Layer 2 access layer switch and run Layer 3 from the aggregation layer to all remaining access layer switches.
- B . Align HSRP primary and STP root bridges and reduce ARP timers to match CAM timers on the aggregation layer switches.
- C . Migrate to a Layer 3 access campus design if the APs can run on separate VLANs.
- D . Align HSRP primary and STP root bridges if the APs cannot run on separate VLANs.
Refer to the exhibit.
An engineer must optimize the traffic flow of the network.
Which change provides a more efficient design between the access 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
When designing interdomain multicast, which two protocols are deployed to achieve communication between multicast sources and receivers? (Choose two.)
- A . IGMPv2
- B . BIDIR-PIM
- C . MP-BGP
- D . MSDP
- E . MLD
A branch office has a primary L3VPN MPLS connection back to the main office and an IPSEC VPN tunnel that serves as backup.
Which design ensures that data is sent over the backup connection only if the primary MPLS circuit is down?
- A . Use EIGRP to establish a neighbor relationship with the main office via
- B . L3VPN MPLS and the IPSEC VPN tunnel.
- C . Use BGP with the multipath feature enabled to force traffic via the primary path when available.
- D . Use static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.
- E . Use OSPF with a passive-interface command on the backup connection.
Which component of Cisco SD-Access integrates with Cisco DNA Center to perform policy segmentation and enforcement through the use of security group access control lists and security group tags?
- A . Cisco Application Policy Infrastructure Controller Enterprise Module
- B . Cisco Network Data Platform
- C . Cisco Identity Services Engine
- D . Cisco TrustSec