300-420 Sample Questions Answers

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?

Refer to the exhibit. A network engineer with an employee ID: 4384:99:754 must design a BGP solution based on these conditions:

Traffic sessions occur between the branches and the data center.

Branch B has limited resources to process routing updates.

HQ must filter out all prefixes from branch A to R4.

Which outbound route filtering (ORF) solution must the engineer choose?

Refer to the exhibit. An architect must design a solution to connect bank site A with bank site B and support:

network operation center monitoring end-to-end L3VPN and L2VPN traffic

company adding thousands of routes in the next two years

Which two BGP solutions must the design include? (Choose two.)

An enterprise needs to enhance its WAN availability after a recent outage with its only MPLS provider. The proposed solution must have a quick deployment, be affordable, be reliable, and work as a backup for the enterprise's primary MPLS connection. Which solution meets these requirements?

Refer to the exhibit. 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?

Refer to the exhibit. The connection between SW2 and SW3 is fiber and occasionally experiences unidirectional link failure. An architect must optimize the network to reduce the change of layer2 forwarding loops when the link fails. Which solution should the architect include?

An architect is designing how the company will manage the infrastructure of a large data center. The company wants to group device types for security reasons and mitigate DoS attacks. The company also wants to ensure that access to the rest of the production network is not possible if one device is compromised on the management plane. Which solution must the architect choose?

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?

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?

Which two routing protocols allow for unequal cost load balancing? (Choose two.)

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?

Drag and drop the properties from the left onto the Cisco SD-WAN components that perform them on the right.

A company must automate a set of complex changes aligned with DR testing in the network. These changes are specific, and the DR playbook will be adjusted in the future. The playbook has diverse routing and switching assets in scope as well as multiple vendor and hardware platforms. A developer will create a thin, web front-end microservice and integrate with an Open daylight controller to push changes to the network. Which YANG model should be used?

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

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

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

Which component is part of the Cisco SD-Access overlay architecture?

Which two functions is the Cisco SD-Access Edge Node responsible for? (Choose two.)

Refer to the exhibit. Currently, the network uses a single-homed solution for connecting to the internet. An engineer must design a more resilient WAN using the internet circuits at each site. The design must provide failover connectivity, support load-sharing of traffic, and QoS. Which solution must the engineer choose?

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?

What are two characteristics of a migration from an IP-VPN service to a Cisco SD-WAN architecture? (Choose two.)

An architect must design a topology for a WAN network that satisfies these requirements:

Devices must be able to make informed decisions.

Suboptimal paths are allowed only In case of a failure.

Backup paths must always be available.

Which topology must the architect select?

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

In PIM sparse mode, if an RPF check is successful on a multicast-enabled device, what happens to the multicast packet?

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?

Drag and drop the Cisco SD-WAN components from the left onto their definitions on the right.

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

Refer to the exhibit. An architect must create a stable and scalable EIGRP solution for a customer. The design must:

•conserve bandwidth, memory, and CPU processing

•prevent suboptimal routing

•avoid any unnecessary queries

Which two solutions must the architect select? (Choose two.)

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 DM VPN back to the hub with two 10-Mbps internet connections. The branch routers are multivendor and have limited memory and CPU resources. Which routing protocol and design solution meets the requirements?

Refer to the exhibit. 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?

A company wants to enable several third-party video conferencing networks based on multicast services. The video conferencing platform can accommodate numerous and dispersed senders and receivers in third-party networks The interior routing protocol is OSPF and the exterior routing protocol is BGP Which multicast mode must be selected to achieve this goal?

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?

Which PIM mode uses a shared tree only?

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

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

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?

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

What are two valid scaling techniques when an EIGRP network is designed that consists of more than 1000 routers? (Choose two.)

Drag and drop the descriptions from the left onto the categories they apply to on the right.

When is it advisable to provide dedicated control plane nodes within a Cisco SD-Access design?

Which method will filter routes between EIGRP neighbors within the same autonomous system?

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

Refer to the exhibit. An engineer is designing an OSPF solution for a customer. The design must take into consideration:

Application load balancers D. E. and F are in different geographical locations and are OSPF-enabled.

Hosts A, B. and C connect to an application through the load balancers using IP address 10.1.1.1/32.

In the event of a failure of one of the load balancers, hosts must still have access to the application.

Which solution must the engineer choose?

Which feature provides the capability for intra-VN traffic filtering and control within the Cisco SO-Access architecture?

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?

How is redundancy achieved among Cisco vBond Orchestrators in a Cisco SD-WAN deployment?

Which OSPF area blocks LSA Type 3, 4 and 5, but allows a default summary route?

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?

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.)

Drag and drop the types of WAN connectivity from the left onto the connectivity use cases on the right.

A)

B)

C)

D)

Which queuing structure is used on SD-WAN Edge routers?

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

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?

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?

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?

Which two functions are provided by the Cisco SD-WAN orchestration plane? (Choose two.)

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

Which security functionality does gRPC provide?

Which WAN connectivity technology is optimal for edge computing compared to others and why?

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?

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?

An engineer is upgrading a company’s main site to include a connection to a second ISP. The company will receive full Internet routing tables from both ISPs via BGP. The engineer must ensure that the company does not become a transit autonomous system. Which solution should be included in this design?

Refer to the exhibit. An architect must ensure a convergence time of 200 ms or less during a link failure within area 0. In addition, the solution must not impact the overall performance of the network. Which solution must the architect select?

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?

An engineer is designing a Layer 3 campus network running EIGRP between the core, aggregation, and access layers. The access layer switches will be connected to the aggregation layer using Layer 3 copper connections. The engineer wants to improve convergence time for access layer switch failures. Which technique must the design include?

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?

What is the purpose of service routes in OMP updates?

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?

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?

Which type of rendezvous point deployment is standards-based and supports dynamic RP discovery?

Refer to the exhibit.

C0FD9F48 C9ACDC725EA850EC2476EE1E

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?

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

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 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?

Refer to the exhibit. An engineer proposed this solution for a company that requires a loop-free. Layer 2 network design. The network will run 802.1W, and all links will be 1 Gbps. If all interfaces are up as point- to-point adjacencies, what are the expected port end states based on the design?

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?

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

Refer to the exhibit An architect is designing an IPv4 plan using the 172 20 0.0/16 network The design must maximize the number of subnets and minimize the number of wasted IP addresses In addition, the plan must allocate a subnet to these customers and links

Customer A, which supports 125 hosts

Customer D, which supports 62 hosts

Links B C. and E

Which two configuration sets meet these requirements'? (Choose two)

A)

B)

C)

D)

E)

Which two statements describe source trees in a multicast environment? (Choose two.)

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?

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

every site? (Choose two.)

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?

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

Refer to the exhibit. 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?

Refer to the exhibit. 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?

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

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

Which AES mode should be used in a Cisco SD-WAN environment that includes multicast applications?

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

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?

Which two functions does the control plane node provide in a Cisco SD-Access architecture? (Choose two.)

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

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?

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?

An architect must create a QoS solution for a customer to ensure that a 40 Mbps Internet connection is shared between four subnets based on these requirements:

* Each subnet must receive no less than 10 Mbps of download bandwidth during peak traffic times.

* A subnet can use up to 40 Mbps during nonpeak traffic times if the other subnets are idle.

* Download traffic must never experience a delay.

Which solution must the architect choose?

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 NETCONF operation creates filtering that is specific to the session notifications?

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?