Cisco 300-420 Designing Cisco Enterprise Networks (ENSLD) Online Training
Cisco 300-420 Online Training
The questions for 300-420 were last updated at Oct 24,2025.
- Exam Code: 300-420
- Exam Name: Designing Cisco Enterprise Networks (ENSLD)
- Certification Provider: Cisco
- Latest update: Oct 24,2025
Refer to the exhibit.
Which method must an architect use to provide connectivity between the mail servers?
- A . ISATAP
- B . 6to4
- C . IPv4 compaliDie
- D . 6rd
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 . Utilize random early detection to manage queues
- C . Implement higher-speed uplink interfaces
- D . Bundle additional uplinks into logical EtherChannels
- E . Configure selective packet discard to drop noncritical network traffic.
Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?
- A . External fusion routers can be used to map VNs to VRFs and selectively route traffic between VRFs.
- B . GRE tunneling can be configured between fabric edges to connect one VN to another.
- C . SGTs can be used to permit traffic from one VN to another.
- D . Route leaking can be used on the fabric border nodes to inject routes from one VN to another.
Refer to the exhibit.
An engineer is designing an OSPF network for a client. Requirements dictate that the routers in Area 1 should receive all routes belonging to the network, including EIGRP, except the ones originated in the RIP domain.
Which action should the engineer take?
- A . Make area 1 a NSSA.
- B . Make area 1 a stub.
- C . Make area 1 a standard OSPF area.
- D . Make the area 1 routers part of area 0.
How are wireless endpoints registered in the HTDB in a Cisco SD-Access architecture?
- A . Fabric edge nodes update the HTDB based on CAPPWAP messaging from the AP
- B . Fabric WLCs update the HTDB as new clients connect to the wireless network
- C . Border nodes first register endpoints and then update the HTDB
- D . Fabric APs update the HTDB with the clients’ ElD and RLOC
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
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 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
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 . directed broadcasts on layer 3 devices
- C . proxy ARP on layer 3 devices
- D . DHCP Snooping on layer 2 devices
Which design consideration should be observed when EIGRP is configured on Data Center switches?
- A . Perform manual summarization on all Layer 3 interfaces to minimize the size of the routing table.
- B . Prevent unnecessary EIGRP neighborships from forming across switch virtual interfaces.
- C . Lower EIGRP hello and hold timers to their minimum settings to ensure rapid route reconvergence.
- D . Configure multiple EIGRP autonomous systems to segment Data Center services and applications.
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