300-420 試験問題と解答 - 模擬練習 - 練習問題・模擬試験

Question No : 1
Which common issue causes intermittent DMVPN tunnel flaps?

A.a routing neighbor reachability issue
B.a suboptimal routing table
C.interface bandwidth congestion
D.that the GRE tunnel to hub router is not encrypted

正解:

Question No : 2
An engineer must design a solution to provide backup connectivity between two sites. The engineer plans to use an Internet connection but company policy requires the connection to be encrypted. Additionally, there are several applications that utilize multicast to deliver video streams between the sites .
Which technology should the design include?

A.GRE over IPsec
B.IPsec direct encapsulation
C.GETVPN
D.DMVPN

正解:

Question No : 3
Which feature is required for graceful restart to recover from a processor failure?

A.Cisco Express Forwarding
B.Virtual Switch System
C.Stateful Switchover
D.Bidirectional Forwarding Detection

正解:
Explanation:
https://archive.nanog.org/meetings/nanog42/presentations/Weissner_SSO.pdf
The Stateful Switchover (SSO) feature works with Nonstop Forwarding (NSF) in Cisco software to minimize the amount of time a network is unavailable to its users following a switchover. The primary objective of SSO is to improve the availability of networks constructed with Cisco routers.

Question No : 4
A customer has several remote sites connected with their headquarters through microwave links.
An engineer must propose a backup WAN solution based on these conditions:

Which backup WAN link type the engineer recommend?

A.LTE
B.802.16 WiMAX
C.Laser link
D.802.15.1 Bluetooth

正解:

Question No : 5
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

正解:

Question No : 6
Which function are fabric intermediate nodes responsible for in an SD-Access Architecture?

A.mapping EIDs to RLOCs
B.encapsulating user traffic in a VXLAN header including the SGT
C.registering new endpoints in the HTDB
D.transporting IP packets between edge nodes and border nodes

正解:

Question No : 7
What is one function of the vSmart controller in an SD-WAN deployment?

A.orchestrates vEdge and cEdge connectivity
B.responsible for the centralized control plane of the SD-WAN network
C.provides centralized network management and a GUI to monitor and operate the SD-WAN overlay
D.provides a data-plane at branch offices to pass traffic through the SD-WAN network

正解:

Question No : 8
An engineer must design a solution to connect a customer to the Internet. The solution will include a Layer 3 circuit with a CIR of 50 Mbps from the service provider. The hand-off from the provider's switch to the customer's router is 1Gbps .
Which solution should the engineer include to prevent potential issues with choppy voice traffic?

A.Reduce the bandwidth of the connection to the router.
B.Implement hierarchical QoS with a parent policing policy.
C.Implement hierarchical QoS with a parent shaping policy.
D.Add a bandwidth statement to the router interface.

正解:

Question No : 9
An engineer must use YANG with an XML representation to configure a Cisco IOS XE switch with these specifications:
✑ IP address 10.10.10.10/27 configured on the interface GigabitEthernet2/1/0
✑ connectivity from a directly connected host 10.10.10.1/27
Which YANG data model set must the engineer choose?
A)

B)

C)

D)

A.Option A
B.Option B
C.Option C
D.Option D

正解:

Question No : 10
A customer is discussing QoS requirements with a network consultant. The customer has specified that end-to-end path verification is a requirement .
Which QoS solution meets this requirement?

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

正解:

Question No : 11
A company with multiple service providers wants to speed up BGP convergence time in the event a failure occurs with their primary link .
Which approach achieves this goal and does not impact router CPU utilization?

A.Utilize BFD and tune the multiplier to 50
B.Lower the BGP hello interval
C.Decrease the BGP keepalive timer
D.Utilize BFD and keep the default BGP timers

正解:

Question No : 12
An engineer is designing a multicast network for a company specializing in VoD content. Receivers are across the Internet, and for performance reasons, the multicast framework close to the receivers within each AS. For high availability, if the sources in one AS are no longer available, the receivers of that AS must be able to receive the VoD content from sources in another AS .
Which feature must the design include?

A.Bidirectional PIM
B.SSM
C.Anycast RP
D.MSDP

正解:
Explanation:
https://learningnetwork.cisco.com/s/question/0D53i00000KsrGrCAJ/rendezvous-point-high-availability-mechanisms

Question No : 13
DRAG DROP
An engineer must design an addressing plan for a small business using a single /24 network. Each department must have its own subnet.
Drag and drop the subnets from the left onto the departments requirements that they fulfill on the right. Not all options are used.

正解:

Question No : 14
What is the role of a control-plane node in a Cisco SD-Access architecture?

A.fabric device that connects wired endpoints to the SD-Access fabric
B.map system that manages endpoint to device relationships
C.fabric device that connects APs and wireless endpoints to the SD-Access fabric
D.map system that manages External Layer 3 networks

正解:
Explanation:
Reference: https://netaavi.com/my-blog-1/f/overview-of-sda-fabric-solution

Question No : 15
An organization plans to deploy multicast across two different autonomous systems.
Their solution must allow RPs to:
• discover active sources outside their domain
• use the underlying routing information for connectivity with other RPs
• announce sources joining the group
Which solution supports these requirements?

A.MSDP
B.SSM
C.PIM-SM
D.PIM-DM

正解:
Explanation:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-3s/asr903/imc-pim-xe-3s-asr903-book/imc_msdp.pdf

Cisco 300-420 問題練習