[2025年更新]300-420回答無料デモは最適で最高のリアルな試験合格させます
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質問 # 91
An engineer is designing a BGP network for a large customer. To permit efficient scaling, the BGP domain is split into clusters. Which peering solution should be used between the route reflectors in different clusters for the BGP routes to be propagated appropriately?
- A. The route reflectors should have peering through another nonclient router.
- B. The route reflectors should not have any kind of BGP peering.
- C. The route reflectors should be made dents of each other.
- D. The route reflectors should be nonclients with regards to each other.
正解：D
解説：
The route reflectors should have peering through another nonclient router.
This approach involves using a nonclient route reflector to facilitate peering between route reflectors in different clusters.
The nonclient route reflector serves as a mediator or a transit point for BGP route information between clusters.
This method helps maintain a scalable and hierarchical design because you don't need a full mesh of BGP peerings between route reflectors in different clusters.
質問 # 92
Refer to the exhibit.
An architect is designing a routing solution for a company. The new design will add a circuit routers C and D to protect against loss of connectivity to 10.0.4.0/24 during a link failure between routers B and D. Which solution must the architect choose?
- A. Stub receive-only
- B. Stub connected
- C. Stub leak-map
- D. Stub redistributed
正解：B
質問 # 93
Refer to the exhibit. Which solution decreases the EIGRP convergence time?
- A. Enable stub routing on the spokes
- B. Increase the dead timer value
- C. Increase the hold time value
- D. Enable subsecond timers
正解：A
解説：
Query storms are eliminated, which saves bandwidth and CPU and allows the network to converge more quickly.
https://www.cisco.com/en/US/technologies/tk648/tk365/technologies_white_paper0900aecd8023 df6f.html
質問 # 94 
Refer to the exhibit A customer wants to adopt a dynamic site-to-site VPN solution to secure communication for VoIP, video, and FTP traffic between the remote branches and the headquarters. The customer also wants the branches to communicate directly, thereby reducing traffic at the headquarters location. The solution must consider that the branch routers are limited in available memory. Which VPN solution meets these requirements?
- A. DMVPN Phase 3 Hierarchical design
- B. DMVPN Phase 1 Hub and Spoke design
- C. DMVPN Phase 3 Hub and Spoke design
- D. DMVPN Phase 2 Hub and Spoke design
正解：C
質問 # 95
Drag and drop the characteristics from the left onto the YANG modules they describe on the right. Not all options are used.
正解：
解説：
質問 # 96
Refer to the exhibit.
A network engineer must design a multicast solution based on:
* Many-to-many communications between the users and sources
* Support of up to 50 multicast sources
* Users that must register for steams
Which multicast solution must the engineer select?
- A. Multicast VPN
- B. Source-Specific Multicast
- C. Any Source Multicast
- D. Bidirectional PIM
正解：D
質問 # 97
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. Anycast RP
- B. SSM
- C. MSDP
- D. Bidirectional PIM
正解：A
解説：
Explanation
https://learningnetwork.cisco.com/s/question/0D53i00000KsrGrCAJ/rendezvous-point-high-availability-mechan
質問 # 98
Refer to the exhibit. Where must an architect plan for route summarization for the topology?
- A. from the aggregation toward the core and the aggregation toward the access
- B. from the aggregation toward the access and the access toward the aggregation
- C. from the core toward the aggregation and the aggregation toward the core
- D. from the core toward the aggregation and the access toward the aggregation
正解：A
質問 # 99
Refer to the exhibit.
Which solution decreases the EIGRP convergence time?
- A. Enable stub routing on the spokes
- B. Increase the dead timer value
- C. Increase the hold time value
- D. Enable subsecond timers
正解：A
質問 # 100
An engineer is designing an EIGRP network for a small branch site where there is only one Layer 3 router. The engineer wants the router to advertise the local LAN network to remote EIGRP neighbors without sending any unnecessary multicast messages on the local LAN. Which action should the engineer take?
- A. Use a static default route for this site instead of EIGRP
- B. Advertise the local LAN using the network command and the passive-interface feature
- C. Redistribute the local LAN network using the redistribute connected command
- D. Advertise the local LAN subnet as a stub network
正解：B
解説：
Section: Advanced Addressing and Routing Solutions
質問 # 101
Which two techniques improve the application experience in a Cisco SD-WAN design? (Choose two.)
- A. implementing AMP
- B. implementing Cisco Umbrella
- C. implementing a stateful application firewall
- D. utilizing forward error correction
- E. utilizing quality of service
正解：D、E
質問 # 102
Which control-plane technology allows the same subnet to exist across multiple network locations?
- A. LISP
- B. VXLAN
- C. FabricPath
- D. ISE mobility services
正解：A
質問 # 103
Which queuing structure is used on SD-WAN Edge routers?
- A. LLQ+WRR
- B. FIFO
- C. 1P-4Q-2T
- D. Priority
正解：A
解説：
On Cisco vEdge devices and Cisco IOS XE SD-WAN devices, each interface has eight queues, which are numbered 0 to 7. Queue 0 is reserved, and is used for both control traffic and low- latency queuing (LLQ) traffic. For LLQ, any class that is mapped to queue 0 must also be configured to use LLQ. Queues 1 to 7 are available for data traffic, and the default scheduling for these seven queues is weighted round-robin (WRR). For these queues, you can define the weighting according to the needs of your network. When QoS is not configured for data traffic, queue 2 is the default queue.
https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/qos/vEdge-20-x/qos- book/forwarding-qos.html
質問 # 104
An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?
- A. IPFIX
- B. on-change subscription
- C. static telemetry
- D. periodic subscription
正解：A
解説：
Section: Automation
Explanation
Explanation/Reference:
質問 # 105
An engineer is working for a large cable TV provider that requires multiple sources streaming video on different channels using multicast with no rendezvous point.
Which multicast protocol meets these requirements?
- A. BIDIR-PIM
- B. PIM-SM
- C. any-source multicast
- D. PIM-SSM
正解：D
解説：
PIM-SSM is suitable for when well-known sources exist within the local PIM domain and for broadcast applications. Also, PIM-SSM eliminates the RPs and shared trees.
質問 # 106
A customer's current Layer 2 infrastructure is running Spanning Tree 802.1d, and all configuration changes are manually implemented on each switch. An architect must redesign the Layer 2 domain to achieve these goals:
- A. reduce the time spent on network administration
- B. reduce manual configuration errors
- C. reduce the impact of topology changes
正解：B、C
解説：
Which two solutions should the architect include in the new design? (Choose two.) Implement Rapid PVST+ instead of STP.
Implement MST instead of STP.
Use VTP to propagate VLAN information and to prune unused VLANs.
Configure broadcast and multicast storm control on all switches.
Configure dynamic trunking protocol to propagate VLAN information.
質問 # 107
An engineer must design a management network that enables SSH, NTP, FTP, and SNMP over the production network. The design requires the management of routers and switches that exist across different networks.
Which feature must the design include?
- A. dedicated management VRF connection per device
- B. Management Plane Protection
- C. dedicated management console connection per device
- D. terminal server
正解：A
質問 # 108
Which design element should an engineer consider when multicast is included in a Cisco SD-Access architecture?
- A. PIM SSM must run in the underlay.
- B. Multicast traffic is transported in the overlay and the EID space for wired and wireless clients.
- C. Multicast clients reside in the underlay, and the multicast source is outside the fabric or in the overlay.
- D. Rendezvous points must be used in a PIM SSM deployment.
正解：B
解説：
Multicast traffic is transported in the overlay, in the EID space, for both wired and wireless clients https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2018/pdf/BRKEWN-2020.pdf
https://www.cisco.com/c/dam/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/deploy-guide/cisco-dna-center-sd-access-wl-dg.pdf
質問 # 109
A company wants to switch from static routing to a dynamic routing protocol to ease the administrative and operational overhead. The network topology is hub and spoke, and the branches use DMVPN back to the hub using two 100 Mbps internet connections. Both links must be used due to spikes in traffic, and routing must take traffic utilization of the links into account.
Also, the branch routers have limited memory and CPU resources.
Which routing protocol and design solution must the company choose?
- A. ISIS with the hub and spoke routers configured in two different areas
- B. iBGP with the hub routers set up as route reflectors and branches set up as clients
- C. EIGRP with branch routers as stub routers using ECMP
- D. OSPF deployed in area 0 with branch routers connecting from area 1
正解：C
質問 # 110
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