Downloadable 300-420 Training Materials 2021

NEW QUESTION 1
Which feature must be incorporated into the campus LAN design to enable Wake on LAN?

• A. dynamic ARP Inspection Snooping on layer 2 devices
• B. directed broadcasts on layer 3 devices
• C. proxy ARP on layer 3 devices
• D. DHCP Snooping on layer 2 devices

Answer: B

NEW QUESTION 2
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

Answer: B

NEW QUESTION 3
What is one function of the vSmart controller in an SD-WAN deployment?

• A. orchestrates vEdge and cEdge connectivity
• B. responsible for the centralized control plane of the SD-WAN network
• C. provides centralized network management and a GUI to monitor and operate the SD-WAN overlay
• D. provides a data-plane at branch offices to pass traffic through the SD-WAN network

Answer: B

NEW QUESTION 4
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?

• A. Native
• B. IEEE
• C. OpenConfig
• D. IETF

Answer: D

NEW QUESTION 5
Which two BGP features will result in successful route exchanges between eBGP neighbors sharing the same AS number? (Choose two.)

• A. advertise-best-external
• B. bestpath as-path ignore
• C. client-to-client reflection
• D. as-override
• E. allow-as-in

Answer: DE

NEW QUESTION 6
Which NETCONF operation creates filtering that is specific to the session notifications?

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

Answer: A

NEW QUESTION 7
Drag and drop the characteristics from the left onto the correct telemetry mode on the right.

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
In a dial-in mode, the destination initiates a session to the router and subscribes to data to be streamed. Dialin mode is supported over gRPC in only 64-bit platforms
In a dial-out mode, the router initiates a session to the destinations based on the subscription. All 64-bit IOS XR platforms (except for NCS 6000 series routers) support gRPC and TCP protocols. All 32-bit IOS XR platforms support only TCP.

NEW QUESTION 8
Which design consideration must be made when using IPv6 overlay tunnels?

• A. Overlay tunnels that connect isolated IPv6 networks can be considered a final IPv6 network architecture.
• B. Overlay tunnels should only be considered as a transition technique toward a permanent solution.
• C. Overlay tunnels can be configured only between border devices and require only the IPv6 protocol stack.
• D. Overlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure.

Answer: C

NEW QUESTION 9
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?

• A. IPsec
• B. GRE
• C. PPTP
• D. GRE over IPsec

Answer: D

NEW QUESTION 10
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?

• A. Native
• B. IEEE
• C. OpenConfig
• D. IETF

Answer: D

NEW QUESTION 11
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

Answer: AE

NEW QUESTION 12
An engineer is looking for a standards-driven YANG model to manage a multivendor network environment. Which model must the engineer choose?

• A. Native
• B. OpenConfig
• C. IETF
• D. IEEE NETCONF

Answer: C

NEW QUESTION 13
Which two routing protocols allow for unequal cost load balancing? (Choose two.)

• A. EIGRP
• B. IS-IS
• C. BGP
• D. OSPF
• E. RIPng

Answer: AC

NEW QUESTION 14
An engineer is designing a QoS policy that queues excess packets for later transmission. Which mechanism must be included in the design?

• A. shaping
• B. WRED
• C. policing
• D. RED

Answer: A

NEW QUESTION 15
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?

• A. DiffServ
• B. LLQ
• C. WRED
• D. IntServ

Answer: D

NEW QUESTION 16
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.

Answer: B

NEW QUESTION 17
An engineer must design a multicast network for a financial application. Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better scale routing tables, the design must not use source trees. Which multicast protocol satisfies these requirements?

• A. PIM-SSM
• B. PIM-SM
• C. MSDP
• D. BIDIR-PIM

Answer: B

NEW QUESTION 18
Which design consideration should be observed when EIGRP is configured on Data Center switches?

• A. Perform manual summarization on all Layer 3 interfaces to minimize the size of the routing table.
• B. Prevent unnecessary EIGRP neighborships from forming across switch virtual interfaces.
• C. Lower EIGRP hello and hold timers to their minimum settings to ensure rapid route reconvergence.
• D. Configure multiple EIGRP autonomous systems to segment Data Center services and applications.

Answer: A

NEW QUESTION 19
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

Answer: A

NEW QUESTION 20
Which routes does the overlay management protocol advertise in an SD-WAN overlay?

• A. underlay, MPLS, and overlay
• B. primary, backup, and load-balanced
• C. prefix, TLOC, and service
• D. Internet, MPLS, and backup

Answer: C

NEW QUESTION 21
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?

• A. IPFIX
• B. static telemetry
• C. on-change subscription
• D. periodic subscription

Answer: A

NEW QUESTION 22
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