Cisco 300-420 Online Practice Questions and Exam Preparation

Cisco 300-420 Online Questions & Answers

• Question 81:

  Which function do reverse path forwarding mechanisms perform in a multicast deployment?

  A. They notify the upstream routerof multicast traffic.
  B. They send PIM prune message toward multicast sources.
  C. They eliminate overlapping multicast addresses.
  D. They prevent loops and duplicate packets.
  D. They prevent loops and duplicate packets.

• Question 82:

  Refer to the exhibit.

  

  An architect must design an IPv6 migration solution for an enterprise customer to support these requirements:

  1.Clients will transition to the new IPv6 network, which provides NAT64 and IPv6 DNS resolution services, using the same DNS name that points to the IPv4 address.

  2.The service provider will create a client-facing IPv6 interface with a new IPv6 virtual address that points to the same IPv4 DNS server.

  3.The service provider will support clients that use global IPv6 addresses and encapsulate IPv4 packets into IPv6 tunnels. Which two migration solutions must the architect choose? (Choose two.)

  A. Use dual-stack lite from the MPLS network to the IGR.
  B. Use IPv6 tunneling from the devices to the core MPLS network.
  C. Use dual-stack lite from the devices to the core MPLS network.
  D. Use NAT44/64 from the MPLS network to the IGR.
  E. Use NAT44/64 from the devices to the core MPLS network.
  C. Use dual-stack lite from the devices to the core MPLS network.
  D. Use NAT44/64 from the MPLS network to the IGR.

• Question 83:

  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
  D. Configure each interface as either L1 or L2 circuit type

• Question 84:

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

  A. nonbroadcast multiaccess
  B. multiaccess
  C. point-to-multipoint
  D. nonbroadcast
  E. point-to-point
  B. multiaccess
  E. point-to-point

• Question 85:

  Refer to the exhibit.

  

  An engineer is designing a hierarchical ISIS solution for an enterprise customer with these requirements:

  1.Users in areas 25 and 55 send and receive traffic from both backbone areas.

  2.Link flaps in areas 35 and 45 must not impact other areas.

  3.Routers will double within the next 12 months in areas 35 and 45. Which design must the engineer select?

  A. A series routers Level 2, B series routers Level 2, and C series routers Level 1
  B. A series routers Level 1/2, B series routers Level 1/2, and C series routers Level 1/2
  C. A series routers Level 1/2, B series routers Level 2, and C series routers Level 2
  D. A series routers Level 1, B series routers Level 1/2, and C series routers Level 2
  D. A series routers Level 1, B series routers Level 1/2, and C series routers Level 2

• Question 86:

  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:

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

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

  3.Download traffic must never experience a delay. Which solution must the architect choose?

  A. rate-limiting and shaping
  B. bandwidth percentage and policing
  C. shaping and policing
  D. bandwidth percentage and rate-limiting
  B. bandwidth percentage and policing

• Question 87:

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

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

• Question 88:

  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. IPsec tunnels
  B. Get VPN
  C. SD-WAN
  D. DMVPN
  C. SD-WAN

• Question 89:

  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.)

  A. support for AES 256-bit encryption
  B. greater scalability
  C. support for anycast gateway
  D. lower traffic overhead
  E. dynamic spoke-to-spoke tunnels
  B. greater scalability
  E. dynamic spoke-to-spoke tunnels

• Question 90:

  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
  A. R1 has no route to R2 and drops the traffic