Cisco 300-420 Questions Answers
Designing Cisco Enterprise Networks- 379 Questions & Answers
- Update Date : October 12, 2026
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Cisco 300-420 Sample Questions
Question # 1An engineer working for a service provider with an employee ID: 4863:43:939 must designa solution to provide remote connectivity over the public internet. The design must:securely connect multiple remote sites to the central siteprovide redundant paths to the central siteallow auto path selection based on failure and connection qualitysupport IP multicastminimal configuration at remote sitesWhich solution must the engineer choose?
A. MPLS provided service with BGP
B. dual DMVPN with EIGRP routing
C. full mesh OSPF with IPsec tunnels
D. full mesh ISIS with GRE tunnels and IPsec
Question # 2
An engineer is designing a Layer 3 campus network running EIGRP between the core,aggregation, and access layers. The access layer switches will be connected to theaggregation layer using Layer 3 copper connections. The engineer wants to improveconvergence time for access layer switch failures. Which technique must the designinclude?
A. enabling BFD for EIGRP on the access layer uplinks
B. reducing the EIGRP Hello / Hold timer values
C. EIGRP summarization from core to aggregation layer
D. EIGRP summarization from access to aggregation layer
Question # 3
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. Fabric borders use VRFs to map VNs to VRFs
C. SD-Access transit links are used to transport encapsulated traffic from one fabric
to another
D. A fabric edge is used to de-encapsulate VXLAN traffic to normal IP traffic then
transported over the outside network
Question # 4
An existing network solution is using BFD in echo mode. Several of the network devicesare experiencing high CPU utilization which an engineer has determined is related to theBFD feature. Which solution should the engineer leverage to reduce the CPU load?
A. Implement slow timers between peers with low CPU resources.
B. Implement BED asynchronous mode between peers with low CPU resources.
C. Enable BFD multi-hop on the devices with low CPU resources.
D. Utilize carrier delay on all routers in the network.
Question # 5
An engineer must establish a direct connection between two remote offices. The newconnection must be established using a logical path, share a common broadcast domain,connect over private WAN, and have as little overhead as possible. Which technology mustthe engineer choose?
A. L2VPN
B. GET VPN
C. IPsec
D. GRE
Question # 6
An engineer must design a multicast network for a financial application. Most of themulticast sources also receive multicast traffic (many-to-many deployment model). Tobetter scale routing tables, the design must not use source trees. Which multicast protocolsatisfies these requirements?
A. PIM-SSM
B. PIM-SM
C. MSDP
D. BIDIR-PIM
Question # 7
How is redundancy achieved among Cisco vBond Orchestrators in a Cisco SD-WANdeployment?
A. The IP addresses of all Orchestrators are mapped to a single DNS name.
B. The closest Orchestrator to each Cisco WAN Edge router is selected.
C. Cisco WAN Edge routers are configured with all Orchestrators using their IP addresses
and priority.
D. A single Cisco Orchestrator is deployed in each network.
Question # 8
A customer requires QoS to support multimedia conferencing over MPLS. The networkarchitect chooses to use per-hop behavior. Which solution must the architect use to classifyand mark traffic traveling between branch sites?
A. BW Queue and DSCP WRED with DSCP AF3
B. BW Queue with DSCP AF3
C. BW Queue and DSCP WRED with DSCP AF4
D. BW Queue with DSCP AF4
Question # 9
A network engineer must connect two sites across a public network using a securetunneling technology thatsupports multicast traffic. Which technology must be chosen?
A. IPsec
B. GRE
C. PPTP
D. GRE over IPsec
Question # 10
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
Question # 11
Which two considerations must be made regarding the overlay network for a Cisco SDAccess architecture? (Choose two.)
A. Virtual networks should be used for microsegmentation
B. SGTs should be used for data plane isolation and microsegmentation
C. Virtual networks should be used for data plane isolation only
D. Overlapping IP addresses across different overlay networks should be used to conserve
IP addresses
E. Overlapping IP addresses across different overlay networks should be avoided for
operational simplicity
Question # 12
What is the purpose of the fabric control plane in a Cisco SD-Access architecture?
A. create, propagate, and enforce G6AC policies in the fabric
B. create a transit node with BGP route reflector functionality
C. extend multiple subnets to one RLOC
D. create and resolve endpoint-to-location mapping
Question # 13
Which two routing protocols allow for unequal cost load balancing? (Choose two.)
A. EIGRP
B. IS-IS
C. BGP
D. OSPF
E. RIPng
Question # 14
A customer reports that each time a networking component fails, OSPF recalculates thebackup path, with causes a short outage. Which solution must the customer implement toimprove this situation?
A. Aggressive OSPF timers
B. LFA FRR
C. Incremental SPF
D. BFD
Question # 15
An engineer must design a solution to provide backup connectivity between two sites. Theengineer plans to use an Internet connection but company policy requires the connection tobe encrypted. Additionally, there are several applications that utilize multicast to delivervideo streams between the sites. Which technology should the design include?
A. GRE over IPsec
B. IPsec direct encapsulation
C. GETVPN
D. DMVPN