300-420 Sample Questions Answers

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?

Which feature is required for graceful restart to recover from a processor failure?

Refer to the exhibit.

An engineer must optimize the traffic flow of the network. Which change provides a more

efficient design between the access and the distribution layer?

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?

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?

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?

Drag and drop the descriptions from the left onto the corresponding VPN types on the rights.

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?

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.)

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

An architect is designing a network that will utilize the spanning tree protocol to ensure a loop-free topology. The network will support an engineering environment where it is necessary for end users to connect their own network switches for testing purposes. Which feature should the architect include in the design to ensure the spanning tree topology is not affected by these rogue switches?

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

Refer to the exhibit.

An architect is designing a network for a customer supporting a Wake-on-LAN application. Which solution must the architect choose?

An engineer is designing a QoS policy that queues excess packets for later transmission. Which mechanism must be included in the design?

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?

Refer to the exhibit. Which two solutions maximize the use of the links between the core and distribution layers? (Choose two.)

A company is using OSPF between its HQ location and a branch office. HQ is assigned area 0 and the branch office is assigned area 1. The company purchases a second branch office, but due to circuit delays to HQ, it

decides to connect the new branch office to the creating branch office as a temporary measure. The new branch office is assigned area 2. Which OSPF configuration enables all three locations to exchange routes?

Which consideration must be taken into account when using the DHCP relay feature in a Cisco SD-Access Architecture?

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?

Refer to the exhibit. An engineer is designing a BGP solution for a client that peers with ISP1 for full Internet connectivity and with ISP2 for direct exchange of routes for several third parties. Which action, when implemented on the edge routers, enables the client network to reach the Internet through ISP1?

A network administrator is troubleshooting a DMVPN setup between the hub and the spoke. Which action should the administrator take before troubleshooting the IPsec configuration?

What is the purpose of an edge node in an SD-Access network fabric?

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 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?

Which design consideration must be made when using IPv6 overlay tunnels?

Refer to the exhibit. An engineer Is designing a multicampus Layer 3 Infrastructure using EIGRP as the routing protocol. The design must provide quick replies to queries In the event of a downlink, prevent unnecessary queries, and ensure that traffic does not unnecessarily transit the access layer. Which two actions must the engineer take for the network design? (Choose two.)

Refer to the exhibit. 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?

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

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?

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

How do endpoints inside an SD-Access network reach resources outside the fabric?

Drag and drop the components in a Cisco SD-Access architecture from the left onto their descriptions on the right.

What are two benefits of designing an SD-WAN network fabric with direct Internet access implemented at

every site? (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?

In a multicast network, which condition must be met for an RPF check to be performed on the RP address'?

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

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.)

Refer to the exhibit.

A network engineer must improve the current IS-IS environment. The Catalyst switch is equipped with dual supervisors. Each time a stateful switchover occurs, the network experiences unnecessary route recomputation. Which solution addresses this issue if the upstream router does not understand graceful restart messaging?

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)

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?

What is the role of a control-plane node in a Cisco SD-Access architecture?

Which routes does the overlay management protocol advertise in an SD-WAN overlay?

Drag and drop the model driven telemetry characteristics from the left onto the mode they belong to on the right.

An engineer is working with NETCONF and Cisco NX-OS based devices. The engineer needs a YANG model that supports a specific feature relevant only to Cisco NX-OS. Which model must the engineer choose?

In an SD-WAN architecture, which methods are used to bootstrap a vEdge router?

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?

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. 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 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:

How must the solution prioritize the management traffic over the WAN?

A customer with an IPv4 only network topology wants to enable IPv6 connectivity while preserving the IPv4 topology services. The customer plans to migrate IPv4 services to the IPv6 topology, then decommission the IPv4 topology. Which topology supports these requirements?

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

Refer to the exhibit 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?

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?

How is end-to-end microsegmentation enforced in a Cisco SD-Access architecture?

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?

Which control-plane technology allows the same subnet to exist across multiple network locations?

When a network is designed using IS-IS protocol, which two circuit types are supported? (Choose two.)

Refer to the exhibit. 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?

Refer to the exhibit. An architect must design a solution to connect the network behind R3 with the EIGRP network. Which mechanism should be included to avoid routing loops?

Drag and drop the characteristics from the left onto the YANG modules they describe on the right. Not all options are used.

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?

Refer to the exhibit. An architect is designing a BGP solution to connect a remote branch to a service provider. There are several prefixes within the branch that the company does not want to be advertised to the internet. Which solution should the architect use to accomplish this?

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?

Which design consideration must be made when dual WAN Edge routers are deployed at a branch site?

A branch office has a primary L3VPN MPLS connection back to the main office and an IPSEC VPN tunnel that serves as backup. Which design ensures that data is sent over the backup connection only if the primary MPLS circuit is down?

Refer to the exhibit.

An architect is designing an EIGRP solution based on these requirements:

* Traffic forwarding should use the best two paths while all links are available

* Single path failure must not impact traffic between branch and HQ

Which solution must the architect select?

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

carry control traffic?

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 running BGP, the company obtained a public AS number and IP subnet from ARIN. Which solution must the engineer select?

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