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.
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.
Which OSPF area blocks LSA Type 3, 4 and 5, but allows a default summary route?
- A . normal
- B . stub
- C . NSSA
- D . totally stubby
Which PIM mode uses a shared tree only?
- A . bidirectional
- B . sparse
- C . dense
- D . source-specific
An engineer uses Postman and YANG to configure a router with:
✑ OSPF process ID 400
✑ network 192.168.128.128/25 enabled for Area 0
Which get-config reply verifies that the model set was designed correctly?
A)
B)
C)
D)
- A . Option A
- B . Option B
- C . Option C
- D . Option D
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 . dual-stack
- B . 6to4
- C . ISATAP
- D . 6rd
An engineer must design a routing solution for a company that is single-homed to an ISP. The company’s goal is to run BGP between the CE and the PE devices. To support running BGP, the company obtained a public AS number and IP subnet from ARIN.
Which solution must the engineer select?
- A . • The customer announces the public IP subnet to the ISP
• The ISP announces the default route to the customer. - B . • The customer announces the public IP subnet to the ISP
• The ISP announces the BGP table to the customer - C . • The ISP announces the customer public IP subnet.
• The ISP announces the partial BGP table to the customer. - D . • The customer announces the default route to the ISP
• The ISP announces the default route to the customer
What is the purpose of a Cisco SD-Access underlay network?
- A . to abstract IP-based connectivity from physical connectivity
- B . to emulate LAN segments to transport Layer 2 frames over a Layer 3 network
- C . to establish physical connectivity between switches and routers
- D . to provide virtualization by encapsulating network traffic over IP tunnels
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
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
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
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