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?

enabling BFD for EIGRP on the access layer uplinks

reducing the EIGRP Hello / Hold timer values

EIGRP summarization from core to aggregation layer

EIGRP summarization from access to aggregation layer

An existing network solution is using BFD in echo mode. Several of the network devices are experiencing high CPU utilization which an engineer has determined is related to the BFD feature.Which solution should the engineer leverage to reduce the CPU load?

Implement slow timers between peers with low CPU resources.

Implement BED asynchronous mode between peers with low CPU resources.

Enable BFD multi-hop on the devices with low CPU resources.

Utilize carrier delay on all routers in the network.

Refer to the exhibit. 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?

Advertise a default route for downstream routers within the client network.

Run an eBGP session within different VRFs for each ISP.

Advertise a default route for downstream routers within the client network.

Apply the AS-path prepend feature for ISP2.

Apply route filtering such that the client advertises only routes originated from its own AS.

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?

dual-homed Internet with a single edge router running a site-to-site VPN topology

dual-homed WAN MPLS with single edge router

dual-homed Internet with a single edge router running a site-to-site VPN topology

dual-homed WAN MPLS and Internet links via dual edge routers

dual-homed Internet with dual edge routers running a hub-and-spoke VPN topology

Refer to the exhibit. Refer to the exhibit. 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?

• Campus: 10.0.0.0/18Branch1: 10.0.192.0/21Branch2: 10.0.200.0/21

• Campus: 10.0.0.0/16Branchi: 10.255.0.0/20Branch2: 10.255.16.0/20

• Campus: 10.0.0.0/10Branch1: 10.64.0.0/10Branch2: 10.128.0.0/10

• Campus: 10.0.0.0/20Branch1: 10.0.64.0/21Branch2: 10.0.128.0/21

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?

Implement hierarchical QoS with a parent shaping policy.

Reduce the bandwidth of the connection to the router.

Implement hierarchical QoS with a parent policing policy.

Implement hierarchical QoS with a parent shaping policy.

Add a bandwidth statement to the router interface.

Refer to the exhibit. 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?

Configure the high metric on the router in area 4.

Configure route leaking on the router in area 2.

Configure route leaking on the router in area 1.

Configure the high metric on the router in area 4.

Configure route filter on the router in area 4.

Refer to the exhibit. 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?

Move the link between routers C and D to area 10.

Create an OSPF virtual link between routers E and F.

Create a tunnel between routers E and F in area 10.

Make area 10 a not-so-stubby area.

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?

site-to-site IPv6 over IPv4 tunnels

Refer to the exhibit. 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?

Make area 1 a standard OSPF area.

Make the area 1 routers part of area 0.

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

use multiple unequal-cost links

An engineer is tasked with designing a dual BGP peering solution with a service provider. The design must meet these conditions:The routers will not learn any prefix with a subnet mask greater than /24.The routers will determine the routes to include in the routing table based on the length of the mask alone.The routers will make this selection regardless of the service provider configuration.Which solution should the engineer include in the design?

Use an IP prefix list to block the desired networks and apply the IP prefix list to BGP neighbors inbound.

Use a route map and access list to block the desired networks, and apply the route map to BGP neighbors inbound.

Use a route map and prefix list to block the desired networks, and apply the route map to BGP neighbors outbound.

Use an IP prefix list to block the desired networks and apply the IP prefix list to BGP neighbors outbound.

Use an IP prefix list to block the desired networks and apply the IP prefix list to BGP neighbors inbound.

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?

Advertise the local LAN using the network command and the passive-interface feature

Use a static default route for this site instead of EIGRP

Advertise the local LAN using the network command and the passive-interface feature

Redistribute the local LAN network using the redistribute connected command

Advertise the local LAN subnet as a stub network

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.)

Implement Rapid PVST+ instead of STP.

Use VTP to propagate VLAN information and to prune unused VLANs.

Implement Rapid PVST+ 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.

How is sub-second failure of a transport link detected in a Cisco SD-WAN network?

BFD runs on the IPsec tunnels between WAN Edge routers.

Hellos are sent between the WAN Edge routers and the vSmart controller.

BFD runs on the IPsec tunnels between WAN Edge routers.

BGP is used between WAN Edge routers and the vSmart controller.

Link state change messages are sent between vSmart controllers.

A customer’s environment includes hosts that support IPv6-only. Several of these hosts must communicate with a public web server that has only IPv4 domain name resolution. Which solution should the customer use in this environment?

utilize NAT64 to translate the addresses

Implement NAT44 at the edge of the customer network

use 6to4 and a tunnel to translate the addresses

implement 6PE to resolve hostname resolution

Refer to the exhibit. Refer to the exhibit. An engineer must design an automatic failover solution. The solution should allow HSRP to detect a WAN 1 failure and initiate an automatic failover, making router R2 the active HSRP router. Which two solutions should the engineer choose? (Choose two.)

Implement Enhanced Object Tracking on router R1

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)

Utilize random early detection to manage queues

Configure selective packet discard to drop noncritical network traffic.

Reconfigure QoS based on the IntServ model

Utilize random early detection to manage queues

Implement higher-speed uplink interfaces

Bundle additional uplinks into logical EtherChannels

Configure selective packet discard to drop noncritical network traffic.

Refer to the exhibit. 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?

Use the preempt delay feature on the primary HSRP device.

Increase the hello timers on both HSRP devices

Use the preempt delay feature on the primary HSRP device.

Use the preempt delay feature on the backup HSRP device

Configure a higher mac-refresh interval on both HSRP devices

Refer to the exhibit. Refer to the exhibit. A customer needs to apply QoS to the network management traffic passing through the GigabitEthernet0/2 interface. All eight queuing classes are in use, so the new requirement must be integrated into the existing policy. Which solution must the customer choose?

Mark the traffic to DSCP CS2 and assign it to the ROUTING class Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the ROUTING class

Mark traffic to DSCP CS5 and assign it to the SIGNALLING class. Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the SIGNALLING class.

Mark the traffic to DSCP CS4 and assign it to the SIGNALLING class. Then, prioritize traffic within the class.

Mark the traffic to DSCP CS6 and assign it to the ROUTING class Then, prioritize traffic within the class.

Mark the traffic to DSCP CS2 and assign it to the ROUTING class Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the ROUTING class

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?

802.1Q connectivity on the LAN side of the CE

route exchange with the service provider

address translation to hide overlapping subnets

What is the purpose of a Cisco SD-Access underlay network?

to establish physical connectivity between switches and routers

to abstract IP-based connectivity from physical connectivity

to emulate LAN segments to transport Layer 2 frames over a Layer 3 network

to establish physical connectivity between switches and routers

to provide virtualization by encapsulating network traffic over IP tunnels

Refer to the exhibit. 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?

Attach the No-Export community with the prefixes to exclude

Set the BGP Internet community for all prefixes.

Implement the NOPEER community.

Use the BGP No-Advertise community for the prefixes to exclude.

Attach the No-Export community with the prefixes to exclude

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?

Mark the traffic with DSCP CS2 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to Class3

Mark the traffic with DSCP CS1 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to CIass3.

Mark the traffic with DSCP CS6 and map into Class1 with a minimum bandwidth assigned by reducing the bandwidth available to Class2

Mark the traffic with DSCP EF and map into Class1 with a minimum bandwidth assigned by reducing the bandwidth available to Class2.

Mark the traffic with DSCP CS2 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to Class3

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

Fabric WLCs update the HTDB as new clients connect to the wireless network

Fabric edge nodes update the HTDB based on CAPPWAP messaging from the AP

Fabric WLCs update the HTDB as new clients connect to the wireless network

Border nodes first register endpoints and then update the HTDB

Fabric APs update the HTDB with the clients' ElD and RLOC

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

to detect endpoints in the fabric and inform the host tracking database of EID-to-fabric-edge node bindings

to maintain the endpoint database and mapping between endpoints and edge nodes

to detect endpoints in the fabric and inform the host tracking database of EID-to-fabric-edge node bindings

to identify and authenticate endpoints within the network fabric

to act as the network gateway between the network fabric and outside networks

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?

Use an open YANG model to allow the reuse of code and standardize the implementation across platforms

Use a single native vendor YANG model to minimize development time

Use an open YANG model to allow the reuse of code and standardize the implementation across platforms

Use multiple native vendor YANG models to provide code consistency.

Develop an individualized YANG model to minimize development resources and time to market.

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?

single topology with transition feature enabled

single topology without enabling transition feature

single topology with transition feature enabled

multi topology with transition feature enabled

multi topology without enabling transition feature

Which method does Cisco SD-WAN use to avoid fragmentation issues?

Traffic is marked with the DF bit set.

Access circuits are configured with 1600 byte MTU settings.

Cisco 300-420 Practice Test 3 - Free Online Exam Prep & Questions

Question 1 / 40

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?

BPDU Skew Detection

BPDU guard

loop guard

root guard

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