Ccna certification Practice Tests

385

 65.  C.  When you process the POST to obtain the X-Auth-Token from the Cisco DNA 

Center, you will pass the username and password encoded in Base 64 encoding. Although 

you will request the X-Auth-Token over Secure Sockets Layer (SSL), it is an encryption 

protocol and not an encoding method. Authentication, authorization, and accounting 

(AAA) services are a means for authentication and often used with 802.1X; AAA is not 

an encoding method. When you request an X-Auth-Token, you will request it via basic 

authentication; this is a HyperText Transfer Protocol (HTTP) method of submitting the 

username and password and not an encoding method.

 66.  B.  You will perform this task using the RESTCONF protocol. RESTCONF will 

encapsulate the YANG data model containing the configuration in a RESTCONF 

transport protocol. OpenFlow is used with the OpenDayLight Protocol and not commonly 

used with Cisco switches. The Simple Network Management Protocol (SNMP) does not 

support the YANG data model. A REST-based API is another API style that switches do 

not support directly, but Cisco DNA Center does.

 67.  A.  When a request is made with RESTCONF, the data is sent via the HyperText Transfer 

Protocol (HTTP) using the Multipurpose Internet Mail Extensions (MIME) content type 

of application/yang-data+json. This MIME type is used because the request is interfacing 

with an application and the data is encapsulated inside of the Yet Another Next 

Generation (YANG) data model in the form of JavaScript Object Notation (JSON).

 68.  D.  The most likely course of action is to restart the REST-based service, since a 500 status 

code means that there is an internal server error. If a 400 status code was returned, it 

would most likely be the formatting of your request. If a 403 status code was returned, 

it would suggest that you have not authenticated to the software-defined network (SDN) 

controller or you are not authorized to access the API. A 200 status code means that 

everything was successful and the request is OK.

 69.  D.  RESTCONF requests are used outbound to network devices on the southbound 

interface (SBI) of Cisco DNA Center. REST-based APIs are accessible via the northbound 

interface (NBI) of the Cisco DNA Center so that programmability can be achieved. 

The eastbound interface is used for events and notification on the Cisco DNA Center 

controller. The westbound interface is used for integration with third-party management 

products.

 70.  A.  The status code is passed back to the client via the HyperText Transfer Protocol 

(HTTP) header. Web-based browsers do not show HTTP headers, and this is why using 

a tool such as Postman is recommended. The HTTP body is where the returned data of 

the request can be found. Script variables are used internally by the script so that data can 

be loaded into the variable and passed to other procedures within the script. Script data 

objects are also used internally by the script to load and pass complex data structures 

called objects.

 71.  A.  A status code of 201 means that the item has been created; normally only a POST 

command can create a data item. A GET HyperText Transfer Protocol (HTTP) verb will 

read an item and return a 200 status code. A PATCH HTTP verb will update an existing 

item and return a 200 status code. A DELETE HTTP verb will delete an item and return a 

200 status code.

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