Last Updated on August 1, 2021 by Admin 2
A user retrieves data in XML format from a Cisco APIC device by submitting a GET request on TCP port 443.
Which of the following technologies are most likely in use? (Choose two.)
- JSON
- REST API
- HTTP
- SOAP API
- HTTPS
Most likely, representational state transfer (REST) Application Programming Interface (API) and Hypertext Transfer Protocol Secure (HTTPS) are in use if a user retrieves data in Extensible Markup Language (XML) format from an application by submitting a GET request on Transmission Control Protocol (TCP) port 443. REST is an API architecture that uses Hypertext Transfer Protocol (HTTP) or HTTPS to enable external resources to access and make use of programming methods that are exposed by the API. In this way, users can interact with specific portions of a data structure from a remote system. By default, HTTPS operates on TCP port 443. A GET request is an HTTP method of retrieving information from an HTTP server.
It is not likely that HTTP is in use in this scenario, because the TCP port on which the GET request is being made is the HTTPS port. If unencrypted HTTP was being used in this scenario, the TCP port on which the request is being made would most likely be TCP port 80. By default, HTTP servers listen for traffic on TCP port 80. On Cisco Application Policy Infrastructure Controller (APIC) devices, HTTPS, not HTTP, is enabled by default. It is possible to enable HTTP on an APIC device. However, HTTP is less secure than HTTPS and is therefore not recommended for that purpose.
It is not likely that Simple Object Access Protocol (SOAP) API is being used in this scenario, because the user is retrieving data from a Cisco APIC device. Cisco APIC does not support SOAP, which is an older API messaging protocol that uses HTTP and XML to enable communication between devices. SOAP APIs are typically more resource-intensive than more modern APIs and, therefore, slower. Open APIs can be used to enable services such as billing automation and centralized management of cloud infrastructure.
JavaScript Object Notation (JSON) is not in use in this scenario. JSON is an output format that is supported by REST API. However, in this scenario, the user has retrieved data from the Cisco APIC device in XML format.