Exam 350-401 topic 1 question 319 discussion

A is Correct Accept and Content-type are both headers sent from a client (a browser) to a service. Accept header is a way for a client to specify the media type of the response content it is expecting and Content-type is a way to specify the media type of request being sent from the client to the server. The response was sent in XML so we can say the Accept header sent was application/xml.

Correct answer is A. Tested using Postman. When using application/xml on the Accept Header (HTTP 400 Bad Request): { "errors": { "error": [ { "error-message": "mismatched keypaths: /interface , /if:interfaces", "error-path": "/ietf-interfaces:interfaces", "error-tag": "malformed-message", "error-type": "application" } ] } } When using application/xml on the Content-Type Header (HTTP 415 Unsupported Media Type): { "errors": { "error": [ { "error-message": "Unsupported media type: application/xml ; Should be one of: application/yang-data+xml, application/yang-data+json.", "error-tag": "malformed-message", "error-type": "application" } ] } }

Among the given options: Option C ("The Content-Type header sent was application/xml") is the best answer, but with a caveat: the error is actually about malformed XML, not necessarily the header. However, the question implies testing knowledge of RESTCONF/XML validation, and option C is closest (the request was sent with Content-Type: application/xml but contained invalid XML). Other options are incorrect: A: The Accept header doesn’t affect request payload parsing. B: The HTTP method (POST/PUT) isn’t related to XML malformation. D: The error explicitly points to XML (not JSON) failure.

The error messages "End-of-file reached in XML stream" and "malformed-message" strongly suggest that the XML parser failed to read a complete and valid XML document. Among the given options, sending a JSON body when XML was expected is the most direct cause that would lead an XML parser to fail in this manner.

I tested it on devnetsandboxiosxe.cisco.com and I get that error if I try to create an interface using JSON as the payload, but specifying application/yang-data+xml in Content-Type curl --user "admin:C1sco12345" -k -H "Accept: application/yang-data+xml" -H "Content-Type:application/yang-data+xml" -X POST -d @data.json http s://devnetsandboxiosxe.cisco.com/restconf/data/Cisco-IOS-XE-native:native/interface <errors xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf"> <error> <error-type>application</error-type> <error-tag>malformed-message</error-tag> <error-path xmlns:ios="http://cisco.com/ns/yang/Cisco-IOS-XE-native">/ios:native/ios:interface</error-path> <error-message>End-of-file reached in XML stream</error-message> </error> </errors>

Given that the issue is related to an improperly formatted XML body in the request and considering the options provided, the correct answer would be related to the Content-Type header. A. The Accept header sent was application/xml: This option is incorrect because the Accept header specifies what media types the client is willing to receive, not what was sent. B. POST was used instead of PUT to update: This is incorrect because the HTTP method used is not indicated as the problem here. C. The Content-Type header sent was application/xml: This is the most appropriate answer. The error message and the HTTP 400 response code indicate that the request was expected to be in XML format (as indicated by the Content-Type header), but the XML was malformed. D. A JSON body was used: This is incorrect because the error message specifically refers to an XML stream, not JSON.

help im so confused

Could someone research this topic please? "using XML in an application to send information" => Does this mean using "Content-Type: application/xml"? If yes, then JSON body would cause HTTP 400 error. Thus, I would go for D) "A JSON body was used." https://csod.my.site.com/supportcentral/s/article/How-do-I-resolve-HTTP-400-Bad-Request-errors-returned-by-Cornerstone-s-APIs?language=en_US "Verify that the Content-Type request header matches the raw body data type. Example: If your raw request body data is in JSON, but the Content-Type request header value contains "application/xml", you will encounter an HTTP 400 error." Plus: https://reqbin.com/req/3mrxjgw4/post-xml-example https://reqbin.com/req/abghm4zf/json-content-type

The errors says " End of Life for XML stream' and it also says ' malformed message'. That means, the format of the data inside the request, which seems to be XML based on the error, is not compatible with what server expects. We define the format of the data inside the request using the Content-Type header (not by the Accept header). So I go with C.

D - Correct; when using Accept and Content-Type : application/yang-data+xml and Body content is JSON: <errors xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf"> <error> <error-message>End-of-file reached in XML stream</error-message> <error-path>/ietf-interfaces:interfaces</error-path> <error-tag>malformed-message</error-tag> <error-type>application</error-type> </error> </errors> when using Accept and Content-Type : application/yang-data+xml and Body content is XML: Status: 201

Correct answer is C problem here is that the path of the interface isn't correct but there is no answer for that. Look at the atached link. there are two examples search for "3.6.3. Encoding Operation Resource Errors" there are two examples of error message one in Content-type in xml and other Content-type in json the result match the error message Content-type in xml LINK: https://datatracker.ietf.org/doc/html/draft-ietf-netconf-restconf-14#section-3.6.3

the correct answer is A.

Check the first line. It's saying xml but requstion yang-restconf

So, the answer is C? So, Accept header sent was NOT application/xml. But, The Content-Type header sent was application/xml. So the system showed an error message because contect was application/xml?

I think it's A

As per the practice exam in: CCNP: ENCOR: 350-401: CCNP ENTERPRISE: Cisco Certified Network Professional: Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR)

Guys, if you want to share your answer, make sure give "Chosen Answer" option to help others. Thanks