Cisco 300-420 Online Practice Questions and Exam Preparation

Cisco 300-420 Online Questions & Answers

• Question 101:

  Refer to the exhibit.

  

  A network engineer must design a highly available OSPF solution based on these requirements:

  1.Traffic disruptions caused by link or node failures in Area-1 must be resolved in milliseconds.

  2.In the event of a failure, traffic must switch to another path without waiting for the OSPF dead interval. Which fault detection solution must the engineer choose?

  A. Decrease SPF timers to 100 ms.
  B. Tune the SPF delay and the OSPF LSA interval timers to 100 ms.
  C. Utilize BFD and tune the BFD timers to 100 ms.
  D. Enable IP SLA tracking for each OSPF peer.
  C. Utilize BFD and tune the BFD timers to 100 ms.

• Question 102:

  How do IETF OpenConfig and Cisco nativo YANG models differ when used to configure the same feature on an infrastructure device?

  A. OpenConfig models are more comprehensive than IETF.
  B. Cisco native models are less comprehensive than OpenConfig.
  C. Cisco native models are less comprehensive than IETF.
  D. IETF models are more comprehensive than OpenConfig.
  A. OpenConfig models are more comprehensive than IETF.

• Question 103:

  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?

  

  A. Utilize 8PDU filter on SW3.
  B. Utilize loop guard on SW2
  C. Utilize BPDU guard on SW1
  D. Utilize root guard on SW1.
  B. Utilize loop guard on SW2

• Question 104:

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

  A. Hellos are sent between the WAN Edge routers and the vSmart controller.
  B. BFD runs on the IPsec tunnels between WAN Edge routers.
  C. BGP is used between WAN Edge routers and the vSmart controller.
  D. Link state change messages are sent between vSmart controllers.
  B. BFD runs on the IPsec tunnels between WAN Edge routers.

• Question 105:

  Refer to the exhibit

  

  A customer requires maximum uptime for the data plane between R1 and R3 running OSPF

  Which solution must the design include for high availability if the routing process on R2 requires maintenance?

  A. BFD on all routers
  B. nonstop forwarding on R1 and R3
  C. nonstop forwarding on R3 only
  D. graceful restart on all routers
  B. nonstop forwarding on R1 and R3

• Question 106:

  A company wants to switch from static routing to a dynamic routing protocol to ease the administrative and operational overhead. The network topology is hub and spoke, and the branches use DMVPN back to the hub using two 100 Mbps internet connections. Both links must be used due to spikes in traffic, and routing must take traffic utilization of the links into account. Also, the branch routers have limited memory and CPU resources.

  Which routing protocol and design solution must the company choose?

  A. ISIS with the hub and spoke routers configured in two different areas
  B. EIGRP with branch routers as stub routers using ECMP
  C. iBGP with the hub routers set up as route reflectors and branches set up as clients
  D. OSPF deployed in area 0 with branch routers connecting from area 1
  B. EIGRP with branch routers as stub routers using ECMP

• Question 107:

  Which AES mode should be used in a Cisco SD-WAN environment that includes multicast applications?

  A. Electronic Code Book (ECB)
  B. Cipher Feedback (CFB)
  C. Cipher Block Chaining (CBC)
  D. Galois/Counter Mode (GCM)
  D. Galois/Counter Mode (GCM)

• Question 108:

  A network engineer must design an MSDP multicast solution to provide RP resilience in a network with two separate domains. Also, multicast sources and receivers must register with the local RP. Which solution must the engineer choose?

  A. Configure the RP has value to 0, and traffic will route to the closest RP
  B. Configure the RP loopback interface with the same IP address/32, and traffic will route to the closest RP
  C. Configure the RP group ranges to split the multicast traffic, and traffic will route to the longest match
  D. Configure the RP priority with the same value, and traffic will route to the closest RP
  B. Configure the RP loopback interface with the same IP address/32, and traffic will route to the closest RP

• Question 109:

  DRAG DROP

  Drag and drop the Cisco Catalyst SD-WAN components from the left to their definitions on the right.

  Select and Place:

  

  

• Question 110:

  A network engineer must optimize a campus OSPF deployment Currently each time a type 1 or type 2 LSA is generated within an area, the OSPF process must recompute the entire SPT Which solution improves the recomputation process?

  A. iSPF
  B. BFD
  C. SPF
  D. PRC
  A. iSPF