300-420 ENSLD:Designing Cisco Enterprise Networks (ENSLD)
Update：2026年4月20日
Questions and Answers: 336 Q&A
1.
A router running ISIS is showing high CPU and bandwidth utilization. An engineer discovers that the router is configured as L1/L2 and has L1 and L2 neighbors. Which step optimizes the design to address the issue?
2.
Which control plane protocol is responsible for ElD-to-RLOC mapping concerning SO-Access Architecture?
3.
What is the purpose of a TLOC extension in a Cisco SD-WAN network fabric?
4.
A company has many spoke sites with two data centers. The company wants to exchange the routing information between the data centers and the spoke sites using EIGRP. All locations belong to a single AS. and auto-summarization Is disabled. Which two actions must the company choose? (Choose two.)
5.
An engineer is creating a design to enable IPv6 to run on an existing IPv4 IS-IS network. The IPv4 and IPv6 topologies will match exactly, and the engineer plans to use the same router levels for each protocol per interface. Which IS-IS design is required?
6.
An engineer is designing an enterprise campus network. The LAN infrastructure consists of switches from multiple vendors, and Spanning Tree must be used as a Layer 2 loop prevention mechanism. All configured VLANs must be grouped in two SIP instances. Which standards-based Spanning Tree technology supports this design solution?
7.
What is the purpose of a Cisco SD-Access underlay network?
8.
Drag and drop the properties from the left onto the protocols they describe on the right.
9.
A network engineer must connect two sites across a public network using a secure tunneling technology that supports multicast traffic. Which technology must be chosen?
10.
Drag and drop the steps WAN Edge performs when on-boarded into the Cisco SD-WAN overlay from the left into the order they are completed on the right.
11.
An engineer is designing a network for a customer running a wireless network with a common VLAN for all APs. The customer is experiencing unicast flooding in the Layer 2 network between the aggregation and access layers. The customer wants to reduce the flooding and improve convergence time. Which solution meets these requirements?
12.
How are wireless endpoints registered in the HTDB in a Cisco SD-Access architecture?
13.
An architect reviews the low-level design of a company's enterprise network and advises optimizing the STP convergence time. Which functionality must be to Gi1/0/1-10 to follow the architect's recommendation?
14.
A customer has two eBGP peerings from a single CE router toward two service providers. The customer has hired an architect to design a solution to ensure certain traffic enters the customer's network through interface g¡g0/0. Which solution must the architect include in the design?
15.
An architect is designing a hierarchical ISIS solution for a customer with these requirements:
- Routers will double In all areas within the next 24 months.
- Link flaps within areas 20 and 30 must not impact the backbone area.
- Traffic originating from A201 and A302 routers must connect to application servers in the backbone.
Which design must the architect select?
16.
A company specializing in VoD content creation has two offices in a separate multicast domain connected by a WAN link. BGP communication has been established between the offices. Clients are inside the LAN in each office. In AS5373. R2 has been selected as RP. What must the network architect design to deliver VoD content to clients in AS65773?
17.
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?
18.
Drag and drop the characteristics from the left onto the correct telemetry mode on the right.
19.
A customer is undergoing a WAN re-architecture and wants to design QoS policies for remote sites that have low bandwidth. What must be considered to have CBWFQ configured in the parent and child policies in an end-to-end QoS design?
20.
Which design consideration must be made when dual WAN Edge routers are deployed at a branch site?
21.
Which common issue causes intermittent DMVPN tunnel flaps?
22.
n engineer must ensure that the QoS design guarantees bandwidth for the applications, and an application can request a particular type of service to support its delay requirements. Which solution must the engineer select
23.
Drag and drop the description from the left onto the corresponding WAN connectivity types and categories on the right.
24.
A global organization with several branches hired a network architect to design an overlay VPN solution. The branches communicate with each other frequently. The customer expects to add more branches in the future. To meet the customer's security requirements, the architect plans to provide traffic protection using dynamic IPsec tunnels. Which solution should the architect choose?
25.
A customer requires maximum uptime for the data plane between R1 and R3 running OSPF Which solution must the design include for high availability if the routing process on R2 requires maintenance?
26.
. A customer experienced an unexpected network outage when the link between R1 and R2 went down. An architect must design a solution to ensure network continuity in the event the link fails again. Which solution should the design include?
27.
How is redundancy achieved among Cisco vBond Orchestrators in a Cisco SD-WAN deployment?
28.
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?
29.
An architect must design a resilient gateway solution based on these requirements:
- VLAN 10 and VLAN 11 support voice and video applications.
- Link and node failures must have minimal impact on traffic.
- Provide protection against false hello packets.
- Support IPv6.
Which solution must the architect choose?
30.
An architect is designing a network solution for a customer The network is IPv6-only with 1000 hosts. The design must provide external access to up to 10 concurrent IPv6 hosts to allow communication with legacy IPv4 devices on an adjacent network. The customer set aside 10 IPv4 addresses to allow for one-to-one communication between hosts. Which solution must the architect select?
31.
An engineer uses Postman and YANG to configure a router with:
- OSPF process ID 200
- network 172.16.10.128/26 enabled for Area 0
Which get-config reply verifies that the model set was designed correctly?
32.
Since installing a cisco TelePresence system, the company is experiencing other application having response issues when the system in use. As a result, the company asked an architect to recommend a QoS solution. The customer is currently using a CBWFQ policy to manage traffic on an internet connection with a speed of 100 Mbps. Which link-capacity limit must the architect choose for strict-priority for the real-time traffic?
33.
An engineer uses Postman and YANG to configure a router with:
- OSPF process ID 100
- network 10.10.10.0/28 enabled for Area0
Which get-config replay verifies that the model set was designed correctly?
34.
AS65533 and AS65530 are announcing a partial Internet routing table as well as their IP subnets. An architect must create a design that ensures AS64512 become a transit AS. Which filtering solution must the architect choose?
35.
Where must an architect plan for route summarization for the topology?
36.
A network architect Is enabling TV services In the LAN. The source will be streaming to the 239.1.1.1 group IP address. Dense mode Is not allowed In the network. Multicast has already been enabled on all network devices In the LAN segment. Which action must the architect take to finalize the design?
37.
What is the purpose of Cisco vBond as a Session Traversal Utilities for NAT server?
38.
Due to budget constraints, a customer decided to purchase WAN routers with one LAN and one WAN interface per device. There is a requirement to connect the three sites to ensure high availability without buying additional WAN links. Which design deployment must the customer choose?
39.
A network engineer must design a multicast solution to prevent the spoofing of multicast streams and ensure efficient bandwidth utilization. The network will be merged with another multicast domain in the future, and the merge must require minimum effort. Which two solutions meet the customer requirements? (Choose two.)
40.
A company wants to deploy IPv6 within its existing network infrastructure. All current infrastructure equipment supports IPv6, and the company wants a migration strategy that must not require purchasing additional equipment The plan must keep operational management costs low. support IPv6 multicast, and allow applications to migrate using DNS. Which strategy must the company choose?
41.
An architect is designing an ISIS network for a customer migrating from IPv4 to IPv6. The current network uses narrow metrics, and the IPv6 areas will increase to 10 within the next two years. Also, IPv6 traffic must not blackhole in IPv4 network during the migration. Which two solutions must the architect choose? (Choose two.)
42.
An enterprise customer has these requirements:
- end-to-end QoS for the business-critical applications and VoIP services based on CoS marking.
- flexibility to offer services such as IPv6 and multicast without any reliance on the service provider.
- support for full-mesh connectivity at Layer 2.
Which WAN connectivity option meets these requirements?
43.
Drag and drop the characteristics from the left onto the telemetry mode they apply to on the right.
44.
An architect is designing an IPv4 plan using the 172.16.0.0/16. The design must maximize the number of subnets while meeting these requirements:
- 500 hosts within the server room
- 100 hosts at the remote site
- 25 hosts at the access site
Which plan must the architect choose?
45.
A company wants to switch from static to dynamic routing. The branches use DMVPN back to the hub using two internet connections. One internet connection speed is 10 Mbps, and the other is 100 Mbps. All locations use Cisco routers; however, the branch routers have limited memory and CPU resources. Which routing protocol and design solution must the company choose for optimal traffic forwarding during peak traffic times?
46.
A company uses cloud-based applications for voice and video calls, file sharing, content sharing, and messaging. During business hours, these applications randomly become slow and unresponsive. However, other applications work smoothly with the current applied QoS polices. Which solution must the company choose to resolve the issue?
47.
An architect must design an IP addressing scheme for a multisite network connected via a WAN transit. The campus site must accommodate 12,000 devices and the branch sites must accommodate 1,000 devices. Which address scheme optimizes network device resources, contains convergence events to the different blocks of the network, and ensures future growth of the network?
48.
Which routes does the overlay management protocol advertise in an SD-WAN overlay?
49.
What is a feature of the SaaS subscription model?
50.
Which design consideration must be made when using IPv6 overlay tunnels?
51.
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?
52.
The distribution switches serve as the layer 3 boundary. HSRP preemption is enabled. When the primary switch comes back after a failure, traffic is initially dropped. Which solution must be implemented to improve the design?
53.
A network engineer must design a BGP solution based on:
- The route reflector must have one or more direct physical connections to the core routers (R3 and R4).
- The route reflector must have full redundancy and avoid a single point of failure.
- R2 to R1 link utilization is 90%. and the remaining links are less than 50% utilized.
Which two solutions must the design Include? (Choose two.)
54.
A network engineer must design a multicast solution based on these requirements:
- interactive communication
- must not use source trees
- users must register
- 100 multicast sources
Which solution must the company choose?
55.
Which two statements about VRRP advertisements are true? (Choose two.)
56.
How is internet access provided to a WAN edge router that is connected to a MPLS transport link?
57.
An engineer is designing a QoS solution for a customer The customer's internet connection has a bandwidth of 10 Mbps. The design must ensure that traffic bursts of data do not exceed the bandwidth of the connection and that received traffic does not starve out business-critical traffic Which solution must the engineer choose?
58.
Which process does the Ethernet LMI protocol follow that is defined by the MEF 16 Technical Specification?
59.
A customer plans to deploy WoL in the enterprise with these high-level design requirements:
- IP directed broadcast and forward-protocol must be enabled on all the SVI or routed interlaces where the client subnets reside.
- IP helper-addresses for the client ranges must be enabled on the SVI or routed interface where the WoL server subnet resides.
- IP helper-addresses for the client ranges must be disabled on the SVI or routed interface where the WoL server subnet resides
- IP helper-addresses for the WoL server must be enabled on the SVI or routed interface where the client subnets reside
- IP directed broadcast and forward-protocol must be disabled on all the SVI or routed interfaces where the client subnets reside.
Which two solutions must the customer select to have a successful deployment? (Choose two.)
60.
Drag and drop the elements from the left onto the YANG models where they and used on the right.
61.
Drag and drop the characteristics from the left onto the Yang model they describe on the right. Select and Place:
62.
The full EIGRP routing table is advertised throughout the network. Currently, users experience data loss when any one link in the network fails. An architect optimizes the network to reduce the impact when a link fails. Which solution should the architect include in the design?
63.
What is the main purpose of the Cisco SD-Access underlay design?
64.
A Cisco Catalyst switch is configured to.. only one MAC address to be learned manually on interface gkjO/2. Which command must be run to dynamically learn the devices that are connected to the switch port?
65.
Which feature provides the capability for intra-VN traffic filtering and control within the Cisco SOAccess architecture?
66.
A company is planning to open two new branches and allocate the 2a01:c30:16:7009::3800/118 IPv6 network for the region. Each branch should have the capacity to accommodate maximum of 200 hosts. Which two networks should the company use? (Choose two.)
67.
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?
68.
Company A recently acquired another company. Users of the newly acquired company must be able to access a server that exists on Company A’s network, both companies use overlapping IP address ranges. Which action conserves IP address space and provides access to the server?
69.
An architect is developing a solution to consolidate networks while retaining device redundancy. The routing protocol for the WAN routers must be open standard, ensure high availability, and provide the fastest convergence time. Which solution must the design include?
70.
Which two functions is the Cisco SD-Access Edge Node responsible for? (Choose two.)
71.
Which PIM mode uses a shared tree only?
72.
An engineer is designing a campus network with Cisco Catalyst 95CO switches in the aggression layer. The design requires running nonblocking Layer 2 MEC from the aggregation layer to the access layer. The Catalyst switches are located on different campus floors for availability reasons, and each access switch veil contam a single VLAN. Which technology must the engineer choose for the aggregation switches in the design?
73.
A client is moving to Model-Driven Telemetry and requires periodic updates. What must the network architect consider with this design?
74.
An architect must design a QoS model for a business-critical application that Is delay-sensitive and requires high bandwidth. The company's head office hosts the application, and DMVPN tunnels protected with IPsec provide connectivity between the head office and branches. Which solution must the architect choose?
75.
A network solution is being designed for a company that connects to multiple Internet service providers. Which Cisco proprietary BGP path attribute will influence outbound traffic flow?
76.
An architect is designing a multicast solution for a network that contains over 100 routers. The architect plans to create several multicast domains and balance the PIM-SM traffic within the network. Which technology should the architect include in the design?
77.
When expanding an existing Cisco SD-Access network, in addition to the control plane, which two device roles are needed to create an additional fabric site? (Choose two.)
78.
Which feature minimizes TLOC connections and reduces strain on the vSmart controller in an SDWAN architecture?
79.
An engineer must connect a new remote site to an existing OSPF network. The new site consists of two low-end routers, one for WAN, and one for LAN. There is no demand for traffic to pass through this area. Which area type does the engineer choose to provide minimal router resources utilization, while still allowing for full connectivity to the rest of the network?
80.
A network engineer prepares a script to configure a loopback interface with IP address 172.16.15.12/32. To comply with the company security policies, 'Content-type': ‘application/yang-data+json‘ is added to the script. Connection to the network devices must be secured. Which code snippet must the network engineer use to meet this requirement?
81.
A network engineer is redesigning a company's QoS solution. The company is currently using IP Precedence, but the engineer plans to move to DiffServ. It is important that the new solution provide backward compatibility with the current solution. Which technology should the design include?
82.
Which two BGP features will result in successful route exchanges between eBGP neighbors sharing the same AS number? (Choose two.)
83.
When a first hop redundancy solution is designed, which protocol ensures that load balancing occurs over multiple routers using a single virtual IP address and multiple virtual MAC addresses?
84.
An architect is working on a design to connect a company's main site to several small to mediumsized remote branches. The solution must include redundant WAN links, but the customer has a limited budget and wants the ability to increase the link speed easily in the future. QoS will not on the branch routers so there is no need for consistent end-to-end QoS. Which solution does the architect propose?
85.
The customer solution requires QoS to support streaming multimedia over a WAN. An architect chooses to use Per-Hop Behavior. Which solution should the engineer use to of mark traffic traveling between branch sites?
86.
Which component of Cisco SD-Access integrates with Cisco DNA Center to perform policy segmentation and enforcement through the use of security group access control lists and security group tags?
87.
Which design element should an engineer consider when multicast is included in a Cisco SDAccess architecture?
88.
An engineer working for a telecommunication company with an employee ID 4449:30 959 Is calculating STP scalability for switches to ensure that the numbers are below the maximum supported value for STP logical ports How many logical interfaces are active for switch A?
89.
In Cisco SD-Access. virtual networks create segmentation that allows for separation of users and resources. How is this type of segmentation described?
90.
An engineer must design a WAN solution so that ISP-1 is always preferred over ISP-2. The path via ISP-2 is considered as a backup and must be used only when the path to ISP-1 is down. Which solution must the engineer choose?
91.
A company requested that an architect propose a new IPv4 and IPv6 deployment strategy. The company wants a solution that is straightforward, with no information hiding or forwarding overhead. Which solution meets these requirements?
92.
An engineer is designing a multicast network for a financial application Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better routing tables, the design must not use source trees. Which multicast protocol satisfies these requirements?
93.
How does a model-driven telemetry dial-out approach function?
94.
Which protocol is deployed through LAN automation to build node-to-node underlay adjacencies in SDA?
95.
Which two statements about VRRP object tracking are true? (Choose two)
96.
A company is running BGP on a single router, which has two connections to the same ISP. Which BGP feature ensures traffic is load balanced across the two links to the ISP?
97.
Which two points in the network must an engineer configure the ports for explicit trust when using a DiffServ model?
98.
When a network is designed using IS-IS protocol, which two circuit types are supported? (Choose two.)
99.
An engineer must design an in-band management solution for a customer with branch sites. The solution must allow remote management of the branch sites using management protocols over an MPLS WAN. Queueing is implemented at the remote sites using these classes:
- Class1 equals voice traffic
- Class2 equals mission-critical traffic
- Class3 equals default traffic
How must the solution prioritize the management traffic over the WAN?
100.
In an SD-WAN architecture, which methods are used to bootstrap a vEdge router?
101.
An organization is designing a detailed QoS plan that limits bandwidth to specific rates. Which two parameters are supported be the traffic policing feature? (Choose two.)
102.
An engineer must propose a QoS architecture model that allows an application to inform the network of its traffic profile and to request a particular type of service to support its bandwidth and delay requirements. The application requires consistent and dedicated bandwidth end to end. Which QoS architecture model meets these requirements?
