Cisco CCNA 200-301 Questions & Answers

• Question 101:

  What is the purpose of a southbound API in a controller-based networking architecture?

  A. facilitates communication between the controller and the applications

  B. allows application developers to interact with the network

  C. integrates a controller with other automation and orchestration tools

  D. facilitates communication between the controller and the networking hardware

  Correct Answer: D

• Question 102:

  Which two northbound APIs are found in a software-defined network? (Choose two.)

  A. REST

  B. OpenFlow

  C. SOAP

  D. NETCONF

  E. OpFlex

  Correct Answer: AC

• Question 103:

  Which function generally performed by a traditional network device is replaced by a software-defined controller?

  A. building route tables and updating the forwarding table

  B. encapsulation and decapsulation of packets in a data-link frame

  C. changing the source or destination address during NAT operations

  D. encryption and decryption for VPN link processing

  Correct Answer: A

• Question 104:

  What describes a northbound REST API for SDN?

  A. network-element-facing interface for GET, POST, PUT, and DELETE methods

  B. application-facing interface for SNMP GET requests

  C. application-facing interface for GET, POST, PUT, and DELETE methods

  D. network-element-facing interface for the control and data planes

  Correct Answer: C

• Question 105:

  When is the PUT method used within HTTP?

  A. to update a DNS server

  B. when a nonidempotent operation is needed

  C. to display a web site

  D. when a read-only operation is required

  Correct Answer: A

  "Standard REST methods are supported on the API, which includes POST, GET, PUT, and DELETE operations through HTTP. The PUT methods are idempotent, meaning that there is no additional effect if they are called more than once with the same input parameters. The GET method is nullipotent, meaning that it can be called zero or more times without making any changes (or that it is a read-only operation)."

  https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/aci_multi-site/sw/1x/rest_api_config/b_Cisco_ACI_Multi-Site_REST_Configuration_Guide/b_Cisco_ACI_Multi-Site_REST_Config_Guide_chapter_01.pdf

• Question 106:

  Which two HTTP methods are suitable for actions performed by REST-based APIs? (Choose two.)

  A. REMOVE

  B. REDIRECT

  C. POST

  D. GET

  E. POP

  Correct Answer: CD

• Question 107:

  What is the advantage of separating the control plane from the data plane within an SDN network?

  A. limits data queries to the control plane

  B. reduces cost

  C. decreases overall network complexity

  D. offloads the creation of virtual machines to the data plane

  Correct Answer: C

• Question 108:

  What is an Ansible inventory?

  A. unit of Python code to be executed within Ansible

  B. file that defines the target devices upon which commands and tasks are executed

  C. device with Ansible installed that manages target devices

  D. collection of actions to perform on target devices, expressed in YAML format

  Correct Answer: B

• Question 109:

  What is a function of a northbound API?

  A. It relies on global provisioning and configuration.

  B. It upgrades software and restores files.

  C. It supports distributed processing for configuration.

  D. It provides a path between an SDN controller and network applications.

  Correct Answer: A

• Question 110:

  What is a function of a northbound API in an SDN environment?

  A. It relies on global provisioning and configuration.

  B. It upgrades software and restores files.

  C. It supports distributed processing for configuration.

  D. It provides orchestration and network automation services.

  Correct Answer: D

  Software-Defined Networking (SDN) - is a higher level of network orchestration. It was originally intended to separate the control-plane and data-plane to enable higher operational efficiency in networking layer devices through programmable forwarding tables (like via the OpenFlow protocol)