300-420 Sample Questions Answers

An engineer must peer with an ISP for internet connectivity using BGP, initially, the engineer wants to receive only specific prefixes from the ISP and a default route. However, the solution must provide the flexibility to add prefixes in the future at short notice. The ISP has a two-week change process in place. Which route filtering solution must the engineer employ?

An engineer must design a large Layer 2 domain that contains hundreds of switches and VLANs. The engineer's primary goals are to:

•Efficiently utilize the bandwidth of all links

•Avoid Layer 2 loops

•Cause minimal impact on switch CPU and memory

Which technology should the engineer include in the design?

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

An engineer must design a management network that enables SSH, NTP, FTP, and SNMP over the production network. The design requires the management of routers and switches that exist across different networks. Which feature must the design include?

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

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.)

Which design consideration should be observed when EIGRP is configured on Data Center switches?

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

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?

Drag and drop the elements from the left onto the protocols where they are used on the right.

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

Which function does the Cisco SD-Access intermediate node perform?

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?

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

Which feature must be incorporated into the campus LAN design to enable Wake on LAN?

A company's security policy requires that all connections between sites be encrypted in a manner that does not

require maintenance of permanent tunnels. The sites are connected through a private MPLS-based service that

uses a dynamically changing key and spoke-to-spoke communication. Which type of transport encryption must

be used in this environment?

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

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?

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?

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

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?

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?

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

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?

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?

Refer to the exhibit.

C0FD9F48C9ACDC725EA850EC2476EE1E

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?

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?

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?

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?

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