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Cisco 300-420 Sample Question Answers

Question # 1

An organization is designing a detailed QoS plan that limits bandwidth to specific rates. Which two parameters are supported be the traffic policing feature? (Choose two.)

A. violating
B. marking
C. shaping
D. bursting 
E. conforming 

Question # 2

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

A. DHCP options or manual configuration
B. vManage or DNS records
C. ZTP or manual configuration
D. DNS records or DHCP options 

Question # 3

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?

A. The existing branch office must be configured as a stub area
B. A virtual link must be configured between the new branch office and HQ
C. A sham link must be configured between the new branch office and HQ
D. The new branch office must be configured as a stub area 

Question # 4

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

A. IGMPv2
B. multicast RP
C. multicast-replicator
D. multicast service routes 

Question # 5

Drag and drop the characteristics from the left onto the correct telemetry mode on the right.

Question # 6

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: 10.0.0.0/20

A. Branch1: 10.0.64.0/21
B. Branch2: 10.0.128.0/21 

Question # 7

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?

A. Move the link between routers C and D to area 10.
B. Create an OSPF virtual link between routers E and F.
C. Create a tunnel between routers E and F in area 10.
D. Make area 10 a not-so-stubby area. 

Question # 8

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?

A. expedited forwarding
B. assured forwarding
C. class selector code points
D. default per hop behavior 

Question # 9

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

A. Use structured hierarchical topology with route summarization
B. Used sub-second timers
C. Use the distribute-list command to filter routes 
D. Modify delay parameters on the links
E. Implement multiple EIGRP autonomous systems 

Question # 10

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?

A. PortFast
B. root guard
C. UplinkFast
D. BPDU guard 

Question # 11

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

A. External fusion routers can be used to map VNs to VRFs and selectively route traffic between VRFs.
B. GRE tunneling can be configured between fabric edges to connect one VN to another.
C. SGTs can be used to permit traffic from one VN to another.
D. Route leaking can be used on the fabric border nodes to inject routes from one VN to another. 

Question # 12

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?

A. enabling BFD for EIGRP on the access layer uplinks
B. reducing the EIGRP Hello / Hold timer values
C. EIGRP summarization from core to aggregation layer
D. EIGRP summarization from access to aggregation layer

Question # 13

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?

A. Tag incoming routes from both ISPs with BGP community no-export.
B. Lower the MED for updates sent to the secondary ISP.
C. Use a route-map to prevent all prefixes from being advertised to either ISP.
D. Modify the local-preference for routes incoming from the primary ISP. 

Question # 14

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

A. Use Bidirectional Forwarding Detection
B. Merge all the areas into one backbone area
C. Tune OSPF parameters
D. Make all non-backbone areas stub areas
E. Span the same IP network across multiple areas. 

Question # 15

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?

A. R1 has no route to R2 and drops the traffic
B. R1 load-balances across the paths through R3 and R4 to reach R2
C. R1 forwards the traffic to R3, but R3 drops the traffic
D. R1 forwards the traffic to R3 in order to reach R2

Question # 16

Company A recently acquired another company. Users of the newly acquired company must be able to access a server that exists on Company A’s network, both companies use overlapping IP address ranges. Which action conserves IP address space and provides access to the server?

A. Use a single IP address to create overload NAT
B. Use a single IP address to create a static NAT entry
C. Build one-to-one NAT translation for every user that needs access
D. Re-IP overlapping address space in the acquired company 

Question # 17

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

A. Use BGP AS-path prepending to influence egress traffic and use MED to influence ingress traffic from the branch.
B. HSRP priorities must match the OMP routing policy to prefer one WAN Edge over the other.
C. Traffic must be symmetrical as it egresses the WAN Edges and returns from remote sites for DPI to function properly.
D. Configure BFD between WAN Edge routers to detect sub-second link failures. 

Question # 18

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?

A. DMVPN
B. EasyVPN
C. GETVPN
D. L2TP

Question # 19

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

A. VLANs are used to segment traffic at Layer 2.
B. 5-tuples and ACLs are used to permit or deny traffic.
C. SGTs and SGTACLs are used to control access to various resources.
D. VRFs are used to segment traffic at Layer 3. 

Question # 20

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

Question # 21

Refer to the exhibit.An engineer must design a WAN solution so that ISP-1 is always preferred over ISP-2. The path via ISP-2 is considered as a backup and must be used only when the path to ISP-1 is down. Which solution must the engineer choose?

A. R1:- Routes advertised to ISP-1: 0x AS-path prepend- Routes received from ISP-1: HIGH local-preference- Routes advertised to R2: no action- Routes received from R2: community NO-EXPORTR2:- Routes advertised to ISP-2:5x AS-path prepend- Routes received from ISP-2: LOW local-preference- Routes advertised to R1: community NO-ADVERTISE- Routes received from R1: no action
B. R1:- Routes advertised to ISP-1: 0x AS-path prepend- Routes received from ISP-1: HIGH local-preference- Routes advertised to R2: community NO-EXPORT- Routes received from R2: no actionR2:- Routes advertised to ISP-2: 5x AS-path prepend- Routes received from ISP-2: LOW local-preference- Routes advertised to R1: no action- Routes received from R1: no action
C. R1:- Routes advertised to ISP-1: 0x AS-path prepend- Routes received from ISP-1: LOW local-preference- Routes advertised to R2: community NO-ADVERTISE- Routes received from R2: no actionR2:- Routes advertised to ISP-2: 5x AS-path prepend- Routes received from ISP-2: HIGH local-preference- Routes advertised to R1: no action- Routes received from R1: community NO-ADVERTISE
D. R1:- Routes advertised to ISP-1: 5x AS-path prepend- Routes received from ISP-1: LOW local-preference- Routes advertised to R2: community NO-ADVERTISE- Routes received from R2: no actionR2:- Routes advertised to ISP-2: 0x AS-path prepend- Routes received from ISP-2: HIGH local-preference- Routes advertised to R1: community NO-EXPORT- Routes received from R1: no action

Question # 22

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

A. LISP proxy ETR
B. host tracking database
C. policy mapping
D. map server
E. endpoint registration

Question # 23

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?

A. Increase the hello timers on both HSRP devices
B. Use the preempt delay feature on the primary HSRP device.
C. Use the preempt delay feature on the backup HSRP device
D. Configure a higher mac-refresh interval on both HSRP device

Question # 24

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

Question # 25

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. Policing
B. Traffic shaping
C. Policer with markdown
D. Queuing 

Question # 26

What is an advantage of designing an out-of-band network management solution?

A. In the event of a production network outage, network devices can still be managed.
B. There is no separation between the production network and the management network.
C. In the event of a production network outage, it can be used as a backup network path.
D. It is less expensive than an in-band management solution 

Question # 27

Drag and drop the description from the left onto the corresponding WAN connectivity types and categories on the right.

Question # 28

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

A. Layer4
B. Layer 2
C. Layer 1
D. Layer 3 

Question # 29

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?

A. Implement slow timers between peers with low CPU resources.
B. Implement BED asynchronous mode between peers with low CPU resources.
C. Enable BFD multi-hop on the devices with low CPU resources.
D. Utilize carrier delay on all routers in the network. 

Question # 30

Refer to the exhibit. All routers currently reside in OSPF area 0. The network manager recently used R1 and R2 as aggregation routers for remote branch locations and R3 and R4 for aggregation routers for remote office locations. The network has since been suffering from outages, which are causing frequent SPF runs. To enhance stability and introduce areas to the OSPF network with the minimal number of ABRs possible, which two solutions should the network manager recommend? (Choose two.)

A. a new OSPF area for R1 and R2 connections,with R1 and R2as ABRs
B. a new OSPF area for R3 and R4 connections,with R5 and R6as ABRs
C. a new OSPF area for R3 and R4 connections,with R3 and R4as ABRs
D. a new OSPF area for R1, R2, R3, and R4 connections, with R1, R2, R3, and R4 as ABRs
E. a new OSPF area for R1 and R2 connections, with R5 and R6 as ABRs 

Question # 31

Drag and drop the characteristics from the left onto the telemetry mode they apply to on the right.

Question # 32

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?

A. Use EIGRP to establish a neighbor relationship with the main office via
B. L3VPN MPLS and the IPSEC VPN tunnel.
C. Use BGP with the multipath feature enabled to force traffic via the primary path when available.
D. Use static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.
E. Use OSPF with a passive-interface command on the backup connection. 

Question # 33

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

A. IGMPv2
B. BIDIR-PIM
C. MP-BGP
D. MSDP
E. MLD 

Question # 34

An architect must develop a campus network solution that includes: logically segmented and isolated networks ability to communicate between network segments when required support for overlapping IP addresses widely available technologies to avoid purchasing specialized equipment Which solution must the architect select?

A. VSS with IGP
B. 802.1Q with HSRP
C. vPC with HSRP
D. VRF-Lite with OSPF 

Question # 35

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. Use a static default route for this site instead of EIGRP
B. Advertise the local LAN using the network command and the passive-interface feature
C. Redistribute the local LAN network using the redistribute connected command
D. Advertise the local LAN subnet as a stub network 

Question # 36

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. Use a static default route for this site instead of EIGRP
B. Advertise the local LAN using the network command and the passive-interface feature
C. Redistribute the local LAN network using the redistribute connected command
D. Advertise the local LAN subnet as a stub network 

Question # 37

An enterprise customer has these requirements:end-to-end QoS for the business-critical applications and VoIP services based on CoS marking.flexibility to offer services such as IPv6 and multicast without any reliance on the service provider.support for full-mesh connectivity at Layer 2.Which WAN connectivity option meets these requirements?

A. VPWS
B. MPLS VPN
C. DMVPN
D. VPLS 

Question # 38

An engineer must design a QoS solution for a customer. The network currently supports data only, but the customer will roll out VoIP and IP video in conjunction with the new QoS solution. The engineer plans to use DiffServ. To ensure priority for voice services, which model must the design include?

A. 8-class model
B. 4-class model
C. 6-class model
D. 12-class model 

Question # 39

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

A. border node
B. spine node
C. leaf node
D. Cisco DNA Center 

Question # 40

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

A. bootstrap router
B. Anycast-RP
C. Auto-RP
D. static RP 

Question # 41

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?

A. Local Preference
B. MED
C. Weight
D. AS Path
E. Community

Question # 42

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

Question # 43

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?

A. Make this router a DIS for each of the interfaces
B. Disable the default behavior of advertising the default route on the L1/L2 router
C. Configure the router to be either L1 or L2
D. Configure each interface as either L1 or L2 circuit type 

Question # 44

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

A. PMTUD is used.
B. Traffic is marked with the DF bit set.
C. Jumbo frames are enabled.
D. Access circuits are configured with 1600 byte MTU settings. 

Question # 45

Refer to the exhibit. An architect must design a solution to connect the two ASs. To optimize bandwidth, the design will implement load sharing between router R6 and router R4. Which solution should the design include?

A. Use update-source to specify the Loopback interface.
B. Use next-hop-serf attributes only for routes that are learned from eBGP peers.
C. Configure the eBGP TTL to support eBGP multihop.
D. Use maximum-paths to install multiple paths in the routing table. 

Question # 46

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?

A. split-horizon
B. summarization
C. down bit
D. route tags 

Question # 47

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

A. encapsulation of traffic with GRE or VTI
B. IPsec forwarding using transport mode
C. additional bandwidth for headend
D. IPsec forwarding using tunnel mode

Question # 48

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

A. <create-subscription>
B. <commit>
C. <notification>
D. <logging>