Cisco 300-420 Dumps Questions Answers

Cisco 300-420 Dumps

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Cisco 300-420 Frequently Asked Questions

Cisco 300-420 Sample Questions

Question # 1

An 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  

Show Answer

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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  

Show Answer

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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

Show Answer

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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.  

Show Answer

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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  

Show Answer

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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  

Show Answer

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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.  

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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  

Show Answer

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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  

Show Answer

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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  

Show Answer

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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

Show Answer

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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  

Show Answer

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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  

Show Answer

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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  

Show Answer

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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  

Show Answer

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Question # 16

A company uses cloud-based applications for voice and video calls, file sharing, contentsharing, and messaging. During business hours, these applications randomly become slowand unresponsive. However, other applications work smoothly with the current applied QoSpolices. Which solution must the company choose to resolve the issue?

A. Identify the applications with NBAR2 and allocate the required bandwidth accordingly.  
B. Identify the port used by each application and apply a minimum bandwidth guarantee.  
C. Identify the applications and reserve the required bandwidth on the perimeter routers.  
D. Identify the application ports, create groupings, and rate-limit the required bandwidth.  

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Question # 17

An engineer must connect a new remote site to an existing OSPF network. The new siteconsists of two low-end routers, one for WAN, and one for LAN. There is no demand fortraffic to pass through this area. Which area type does the engineer choose to provideminimal router resources utilization, while still allowing for full connectivity to the rest of thenetwork?

A. not so stubby  
B. totally not so stubby  
C. totally stubby area  
D. stubby area  

Show Answer

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Question # 18

Which node performs the LISP Map-Server and Map-Resolver functions in the Cisco SDAccess network architecture?

A. control plane node  
B. fabric edge node  
C. border node  
D. intermediate node  

Show Answer

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Question # 19

A company is using OSPF between its HQ location and a branch office. HQ is assignedarea 0 and the branch office is assigned area 1. The company purchases a second branchoffice, but due to circuit delays to HQ, itdecides to connect the new branch office to the creating branch office as a temporarymeasure. The new branch office is assigned area 2. Which OSPF configuration enables allthree locations to exchange routes?

A. The existing branch office must be configured as a stub area  
B. A virtual link must be configured between the new branch office and HQ  
C. A sham link must be configured between the new branch office and HQ  
D. The new branch office must be configured as a stub area  

Show Answer

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Question # 20

An enterprise needs to enhance its WAN availability after a recent outage with its onlyMPLS provider. The proposed solution must have a quick deployment, be affordable, bereliable, and work as a backup for the enterprise's primary MPLS connection. Whichsolution meets these requirements?

A. Contract an internet connection and deploy DMVPN.  
B. Deploy BFD echo mode and probe provider PE  
C. Deploy an additional WAN router and use a floating static route  
D. Contract another MPLS provider and deploy GET VPN.  

Show Answer

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Question # 21

An engineer must peer with an ISP for internet connectivity using BGP, initially, theengineer wants to receive only specific prefixes from the ISP and a default route. However,the solution must provide the flexibility to add prefixes in the future at short notice. The ISPhas a two-week change process in place. Which route filtering solution must the engineeremploy?

A. Request a limited internet routing table and a default route from the ISP and configurethe BGP max-limit to 1 with an access list that permits only the specific internet prefixesand blocked networks 
B. Request only the required prefixes and default route be advertised from the ISO withwhitelisted networks 
C. Request a full internet routing table and a default route from the ISP and configureinbound route filtering with a prefix list that permits the default route and required prefixes
D. Configure outbound route filtering on the enterprise and ISP so that the enterprise tellthe ISP which prefixes are required 

Show Answer

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Question # 22

A large chain of stores currently uses MPLS-based T1 lines to connect their stores to theirdata center. An architect must design a new solution to improve availability and reducecosts while keeping these considerations in mind:» The company uses multicast to deliver training to the stores.» The company uses dynamic routing protocols and has implemented QoS.» To simplify deployments, tunnels should be created dynamically on the hub whenadditional stores open.Which solution should be included in this design?

A. VPLS  
B. GET VPN  
C. DMVPN  
D. IPsec  

Show Answer

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Question # 23

What is the purpose of service routes in OMP updates?

A. specify routes toward a centralized orchestration plane  
B. describe underlay transport Information  
C. define the remote management Information  
D. indicate services that are enabled for service insertion  

Show Answer

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Question # 24

Which two border nodes are available in the Cisco SD-Access architecture? (Choose two.)

A. extended border  
B. edge border  
C. internal border  
D. anywhere border  
E. intermediate border  

Show Answer

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Question # 25

In a Cisco SD-Access fabric, switch node Is equivalent to an access layer switch In atraditional three-tier campus network design?

A. edge node  
B. border node  
C. intermediate node  
D. control plane node  

Show Answer

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Question # 26

In Cisco SD-Access. virtual networks create segmentation that allows for separation ofusers and resources. How is this type of segmentation described?

A. macro  
B. inter-VN  
C. micro  
D. stretctied  

Show Answer

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Question # 27

Which protocol is deployed through LAN automation to build node-to-node underlayadjacencies in SDA?

A. IS-IS  
B. OLISP  
C. OSPF  
D. VXLAN  

Show Answer

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Question # 28

What is a feature of the SaaS subscription model?

A. web connection not required  
B. access to industrial-strength storage and computing power  
C. autonomy and control over hardware  
D. tower initial costs  

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Question # 29

An engineer must propose a solution for a campus network that includes the capability tocreate multiple Layer 3 virtual networks. Each network must have its own addressingstructure and routing table for data forwarding. The solution must be scalable to supporthundreds of virtual networks and allow simple configuration and management with minimaladministrative overhead. Which solution does the engineer recommend?

A. hop-by-hop EVN  
B. multihop MPLS core  
C. multihop IPsec tunneling  
D. hop-by-hop VRF-Lite  

Show Answer

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Question # 30

Which PIM mode uses a shared tree only?

A. bidirectional  
B. sparse  
C. dense  
D. source-specific  

Show Answer

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Question # 31

A network engineer must design a multicast solution based on these requirements:interactive communicationmust not use source treesusers must register100 multicast sourcesWhich solution must the company choose?

A. MSDP
B. PIM-DM  
C. any-source multicast  
D. BIDIR PIM  

Show Answer

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Question # 32

Which WAN connectivity technology is optimal for edge computing compared to others andwhy?

A. Due to low latency, high bandwidth, and closest proximity to the user. 4G/5Gconnectivity is the optimal WAN technology for edge computing compared to L3 VPNMPLS connectivity, which offers native separation and security with close proximity to thedata center. 
B. Due to high bandwidth, separation and security, and proximity to the data centernetwork. DWDM Is the optimal WAN technology lor edge computing compared to 4G/5Gconnectivity, which offers native separation and security with close proximity to the datacenter. 
C. Due to low latency, high bandwidth, and closest proximity to the user, L3 VPN MPLS connectivity is the optimal WAN technology for edge computing compared to 4G/5G connectivity, which offers native separation and security with close proximity to the data center. 
D. Due to low cost, high bandwidth, low latency, and closest proximity to the edge of thenetwork, Mero Ethernet is the optimal WAN technology for edge computing compared toMPLS, which offers native separation and security with close proximity to the data center. 

Show Answer

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Question # 33

When differentiating between IETF. OpenConfig. and Cisco native YANG models, howdoes the use of containers differ?

A. OpenConfig uses one container for operational data and another container forconfiguration data, and IETF and Cisco native models use a single container foroperational data and configuration data. 
B. IETF and Cisco native models use a single container for operational data andconfiguration data, and OpenConfig uses one container for operational data and anothercontainer for configuration data. 
C. IETF and Cisco native models use one container for operational data and anothercontainer for configuration data, and OpenConfig uses a single container for operationaldata and configuration data.
D. Cisco native models use one container for operational data and another container forconfiguration data, and OpenConfig and IETF use a single container for operational dataand configuration data. 

Show Answer

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Question # 34

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 runningBGP, the company obtained a public AS number and IP subnet from ARIN. Which solutionmust 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 

Show Answer

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Question # 35

Which feature minimizes TLOC connections and reduces strain on the vSmart controller inan SD-WAN architecture?

A. control-direction  
B. affinity  
C. color  
D. control-connections  

Show Answer

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Question # 36

An engineer must design a QoS solution for a customer that is connected to an ISP over a1Gbps link with a 100Mbps CIR. The ISP aggressively drops all traffic received over whichis causing numerous TCP retransmissions. The customer is not using any RTPapplications but wants to maximize bandwidth usage up to the CIR. Which QoS solutionengineer choose?

A. Policing 
B. Traffic shaping
C. Policer with markdown  
D. Queuing  

Show Answer

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Question # 37

An engineer is designing an IPv4 addressing plan for an enterprise with 1000 branches.Each branch requires a prefix for data and a prefix for voice. Each prefix mustaccommodate up to 128 hosts, and prefixes must facilitate summarization at aggregationpoints in the network. The security team requires a simple method for identifying voceprefixes. Which allocation does the engineer recommend from the RFC1918 addressspace?

A. /24 prefixes for data from 10.0.0.0/15 and /24 prefixes for voice from 172.16.0.0/15  
B. /24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from the next contiguous/24 prefix per site  
C. /25 prefixes for data from 10.0.0.0/8 end /25 prefixes for voice from the next contiguous /25 prefix per branch 
D. /24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from 172.16.0.0/12  

Show Answer

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Question # 38

A customer plans to adopt distributed QoS in their enterprise WAN. The policy must allowfor individual packet marking according to the type of treatment required and for forwardingbased on hop-by-hop treatment locally defined on each device. Which technology must thecustomer select?

A. CBWFQ
B. LLQ  
C. Diffserv  
D. IntServ  

Show Answer

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Question # 39

Which two options can you use to configure an EIGRP stub router? (Choose two)

A. summary-only  
B. receive-only  
C. external  
D. summary  
E. totally-stubby  
F. not-so-stubby  

Show Answer

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Question # 40

How does a model-driven telemetry dial-out approach function?

A. The device initiates a session to the collector based on the subscription.  
B. The collector initiates a session to the device and subscribes to data to be streamed.  
C. The collector Initiates a session to the device and gets the data of a previously defined subscription. 
D. The device initiates a session to the collector and negotiates a subscription.  

Show Answer

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Question # 41

Which integration capability does gRPC provide?

A. leveraging the LDAP protocol for authentication and directory services ensuring secure access control in RPC communications 
B. leveraging the XMPP protocol for real-time messaging and collaboration between client and server applications
C. leveraging protocol buffers to provide efficient serialization and deserialization of structured data over the network
D. leveraging GRAPH-API for network monitoring and management providing comprehensive visibility into RPC-related metrics and performance statistics

Show Answer

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Question # 42

What is the purpose of a TLOC extension in a Cisco SD-WAN network fabric?

A. to facilitate WAN Edge router redundancy within a site  
B. to identify the physical interface where a WAN Edge router connects to the WAN transport network 
C. to expand the number of colors that are potentially applied to a network transport interface 
D. to aggregate multiple physical interfaces into a single logical Interface  

Show Answer

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Question # 43

A customer is discussing QoS requirements with a network consultant. The customer hasspecified that end-to-end path verification is a requirement. Which QoS solution meets thisrequirement?

A. IntServ model with RSVP to support the traffic flows  
B. DiffServ model with PHB to support the traffic flows  
C. marking traffic at the access layer with DSCP to support the traffic flows  
D. marking traffic at the access layer with CoS to support the traffic flows  

Show Answer

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Question # 44

Prior to establishing full-mesh iPsec tunnels in a typical Cisco SD-WAN deployment, whichmechanism do WAN Edge routers use to exchange Key information for data planeencryption?

A. They use vSmart controllers as key exchange servers.  
B. They use vManage as a key exchange server.  
C. They use IKEv2 when exchanging keys with each other.  
D. They use vBond as a key exchange server.  

Show Answer

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Question # 45

Which nonproprietary mechanism can be used to automate rendezvous point distribution in a large PIM domain?

A. Embedded RP  
B. BSR  
C. Auto-RP  
D. Static RP  

Show Answer

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