300-420 Practice Exam Questions with Answers Designing Cisco Enterprise Networks (ENSLD) Certification

Which design element should an engineer consider when multicast is included in a Cisco SD-Access architecture?

An engineer must design a scalable QoS architecture that allows the separation of the traffic into classes on predefined business requirements. The design must also utilize the differentiated services code points as the QoS priority descriptor value and support at least 10 levels of classification. Which QoS technology should the engineer include in the design?

What is the purpose of the fabric control plane in a Cisco SD-Access architecture?

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?

A customer requested that a guaranteed service line be enabled for a manufacturing business in different countries. On the customer side, the QoS-aware application is used to process large data chunks. The application cannot tolerate drops and latency should be as low as possible. Which QoS model must an engineer employ to use the minimum required resources on the ISP network nodes?

An engineer must design a VPN solution for a company that has multiple branches connecting to a main office. What are two advantages of using DMVPN instead of IPsec tunnels to accomplish this task? (Choose

two.)

Which feature minimizes HOC connections and reduces strain on the vSmart controller m an SO-WAN architecture?

What is the purpose of a border node in a Cisco SD-Access fabric?

In the SD-WAN underlay network, which WAN Edge VPN ID is defined as the transport VPN and is used to

carry control traffic?

Which function do reverse path forwarding mechanisms perform in a multicast deployment?

An architect must address sustained congestion on the access and distribution uplink of network. QoS has already been implemented and optimized, but it is no longer effective in ensuring optimal network performance. Which two solutions should the architect use to improver network performance? (Choose two)

Drag and drop the descriptions from the left onto the Cisco SD-WAN component they describe on the right.

Refer to the exhibit A network administrator plans to announce the site subnets to the WAN using route summarization instead of announcing every subnet. What is the smallest summary route that should be used to encompass all subnets at the site?

Which two steps can be taken to improve convergence in an OSPF network? (Choose two.)

An engineer is designing a WAN solution for a customer with teams in different branch locations that need to communicate The teams also need to access enterprise applications hosted in the data center and the cloud The customer also must provide guests with connectivity to the internet only, and the internet gateway is located in the data center Which solution must the engineer choose?

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

Refer to the exhibit. A company has some offices that are connected via dark fiber in New York. A network architect must optimize the network design based on the EIGRP routing protocol. The network has hierarchical addressing between 10 and 12 routers in each office. Routing convergence time must be at the minimum. What must the network architect do to reduce the query range?

An engineer must propose a solution for a campus network that includes the capability to create multiple Layer 3 virtual networks. Each network must have its own addressing structure and routing table for data forwarding. The solution must be scalable to support hundreds of virtual networks and allow simple configuration and management with minimal administrative overhead. Which solution does the engineer recommend?

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?

Refer to the exhibit. An architect is designing a Layer 2 network for a customer. The network will use the spanning-tree protocol. During a link failure between SW1 and SW2, the fastest possible convergence time is desired. Which solution must the architect select?

An architect is working on a design to connect a company's main site to several small to medium-sized 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?

What are two advantages of the Cisco SD-WAN technology9 (Choose two)

Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?

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?

Refer to the exhibit. Customers report low video quality and delays when having point-to-point telepresence video calls between the two locations. An architect must optimize a design so that traffic follows the same path for egress and ingress traffic flows. Which technique optimizes the design?

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?

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?

Refer to the exhibit. A network engineer working for a private service provider with an employee ID: 4670:71:451 must design a BGP solution based on:

All traffic originating from AS100 must pass through AS200 to reach the NTP and DHCP server

When a link failure occurs between R3 and R4, traffic must follow the R2-R9 link to reach the NTP and DHCP server.

Which solution must the design include?

An engineer is designing a networking solution to allow two hosts to communicate—one host located within the company A network and the other within the company B network. The two companies have no other plans for future additional connections. Both companies want to use a single secure and encrypted internet connection, and the configuration must be as simple as possible. Which network solution must the engineer choose?

Refer to the exhibit. A network engineer is designing an OSPF solution to connect a company's remote to a newly provisioned MPLS VPN backbone. Some of the branches have a direct dark fiber connection between each other. The engineer wants to ensure that the dark fibers are used only when the MPLS core is unavailable. Which solution must the engineer choose?

An engineer uses Postman and YANG to configure a router with:

Which get-config replay verifies that the model set was designed correctly?

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

Drag and drop the characteristics from the left onto the Yang model they describe on the right.

Select and Place:

A network engineer must optimize a campus OSPF deployment Currently each time a type 1 or type 2 LSA is generated within an area, the OSPF process must recompute the entire SPT Which solution improves the recomputation process?

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?

Refer to the exhibit. An architect is designing a network that requires route redistribution. The design must prevent route feedback and the creation of routing loops. The OSPF domain is using default metrics, and the IS-IS domain is using narrow metrics. Which solution must the architect select?

Refer to the exhibit.

The failover time of ISP-2 is significantly shorter than ISP-1 when an interface on the ISP router toward the campus network fails. Which solution minimizes the downtime to the sub-second?

Which two techniques improve the application experience in a Cisco SD-WAN design? (Choose two.)

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?

Refer to the exhibit An engineer is designing an OSPF solution with these requirements:

NMS server will manage R5 and R6.

Upon failure of R1. all NMS traffic should be routed through R4.

Upon failure of the link between R5 and R6. all traffic destined for 10.6.6.6 should be routed through R4

Which solution must the engineer choose?

Refer to the exhibit An engineer with an employee ID: 1234 56:789 must design a WoL deployment for a client, and the design must ensure that the Windows PCs are responsive to the WoL magic packets with no delays when the server-side initiates the instruction Which action must the engineer choose?

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?

Drag and drop the characteristics from the left onto the configuration protocols they describe on the right.

A customer requests a VPN solution to connect multiple sites with the company headquarters. All the sites use the same IP subnet. The engineer plans to use VPLS. Which solutions must the engineer include in the design?

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?

An architect is creating a migration strategy for a large organization in which the choice made by the application between IPv6 and IPv4 is based on the DNS request. Which migration strategy does the architect choose?

Refer to the exhibit. An engineer is planning an IPv4 to IPv6 migration solution for a customer. The routers in the network can support IPv4 and IPv6, except for the DWDM routers. The DWDM routers provide a Layer 2 link in which the routers peer directly with each other across a DWDM circuit. The circuit also provides connectivity between the mail servers. Which IPv6 migration technique must the engineer deploy?

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

When IPsec VPNs are designed, what is a unique requirement if support for IP Multicast is required?

Which two considerations must be made regarding the overlay network for a Cisco SD-Access architecture? (Choose two.)

What is the purpose of Cisco vBond as a Session Traversal Utilities for NAT server?

Refer to the exhibit. An architect working for a service provider with an employee ID: 4763:44:876 must design a Layer 2 VPN solution that supports:

transparency of service provider devices

direct communication between CE routers attached to the same VLAN

Which solution must the design include?

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.)

Refer to the exhibit. An architect with an employee ID: 4542:60:170 is designing a campus Layer 2 infrastructure. The design requires a PoE power budget that varies from 30-60 W. In addition, power must be provided continuously to some endpoints and must be supported even during the reloading of edge switches. Which solution must the architect select?

Refer to the exhibit. An engineer is designing an OSPF network for a client. Requirements dictate that the routers in Area 1 should receive all routes belonging to the network, including EIGRP, except the ones originated in the RIP domain. Which action should the engineer take?

Which feature is used to optimize WAN bandwidth of IGMP network traffic among WAN Edge routers in the

same VPN?

Which element in a Cisco SD-WAN architecture maintains a centralized routing table?

Which two statements about VRRP object tracking are true? (Choose two)

When vEdge router redundancy is designed, which FHRP is supported?

Drag and drop the elements from the left onto the YANG models where they and used on the right.

Drag and drop the elements from the left onto the functions they perform in the Cisco SD-WAN architecture on the right.

Which QoS feature responds to network congestion by dropping lower priority packets?

Which consideration must be made when designing a Cisco SD-Access fabric underlay?

In a Cisco SD-Access fabric, which node facilities connectivity between the fabric and networks external to the fabric?

Refer to the exhibit. 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?

A company plans to transition to IPv6. They will link their IPv4 addresses to the lowest significant bits of the new Ipv6 addresses. A network administrator with an employee id: 4264:42:116 is preparing a mapping schema for the new IPv6 addresses. Which address does the 172.16.10.0/24 network translate to?

Refer to the exhibit.

A customer is running HSRP on the core routers. Over time the company has grown and requires more

network capacity. In the current environment, some of the downstream interfaces are almost fully utilized, but

others are not. Which solution improves the situation?

What is a feature of the SaaS subscription model?

What does the fabric data plane leverage in SD-Access Architecture?

Which feature of Cisco SD-WAN Secure Direct Cloud Access divides user traffic into different zones and VPNs or VRFs?

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?

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?

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?

When designing interdomain multicast, which two protocols are deployed to achieve communication between multicast sources and receivers? (Choose two.)

Which security functionality does gRPC provide?

Refer to the exhibit. 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?

An engineer working for a service provider with an employee ID: 4863:43:939 must design a solution to provide remote connectivity over the public internet. The design must:

securely connect multiple remote sites to the central site

provide redundant paths to the central site

allow auto path selection based on failure and connection quality

support IP multicast

minimal configuration at remote sites

Which solution must the engineer choose?

Which function are fabric intermediate nodes responsible for in an SD-Access Architecture?

Refer to the exhibit.

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A network engineer is designing a network for AS100. The design should ensure that all traffic enters AS100

via link 1 unless there is a network failure. In the event of a failure, link 2 should function as the path for

incoming traffic. Which solution should the design include?

Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal. Which design provides optimal routing between both networks when the link between routers C and E fails?

An engineer must design a QoS solution for a customer that is connected to an ISP over a 1Gbps link with a 100Mbps CIR. The ISP aggressively drops all traffic received over which is causing numerous TCP retransmissions. The customer is not using any RTP applications but wants to maximize bandwidth usage up to the CIR. Which QoS solution engineer choose?

A large chain of stores currently uses MPLS-based T1 lines to connect their stores to their data center. An architect must design a new solution to improve availability and reduce costs 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 when additional stores open.

Which solution should be included in this design?

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

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:

reduce the impact of topology changes

reduce the time spent on network administration

reduce manual configuration errors

Which two solutions should the architect include in the new design? (Choose two.)

An ISP provides Layer 3 VPN service over MPLS to a customer with four branches and multiple CE routers at

each branch. To exchange the routes that are learned from the CE routers, which BGP address family should

the ISP activate among the PE routers?

How are wireless endpoints registered in the HTDB in a Cisco SD-Access architecture?

Refer to the exhibit 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?

Refer to the exhibit. Which method must an architect use to provide connectivity between the mail servers?

Refer to the exhibit. 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.)

Refer to the exhibit.

An engineer is designing a routing solution for a customer. The design must ensure that a failure of network

10.1.0.0/24, 10.1.2.0/24, 10.2.1.0/24, or 10.2.3.0/24 does not impact the core. It also requires fast convergence

time during any link failover in the core or access networks. Which solution must the engineer select?

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?

At which layer does Cisco Express Forwarding use adjacency tables to populate addressing information?

Refer to the exhibit.

EIGRP has been configured on all links. The spoke nodes have been configured as EIGRP stubs, and the WAN links to R3 have higher bandwidth and lower delay than the links to R4. When a link failure occurs at the R1-R2 link, what happens to traffic on R1 that is destined for a subnet attached to R2?

What is the purpose of a control plane node in a Cisco SD-Access network fabric?

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?

Refer to the exhibit. A network architect is preparing a network design based on the EIGRR Routers are connected using a cat6a cable type and the inter-router connection speed is limited to 10 Mbps due to distance. During the pilot phase, a DUAL-3-SIA error message is visible. Which action must the engineer take to create a stable design?