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300-435 · Question #141

Refer to the exhibit. What is the YANG module of this YANG module tree?

The correct answer is D. module server-config { container servers { list server { key "name"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}. This question requires identifying the correct YANG module definition that matches a given YANG module tree structure, focusing on the module, container, list, and key definitions.

Network Automation Foundation

Question

Refer to the exhibit. What is the YANG module of this YANG module tree?

Options

  • Amodule servers-config { container servers { list server { key "servername"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}
  • Bmodule server-config { container server { list servers { key "name"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}
  • Cmodule server-config { container servers { list server { key "name"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}
  • Dmodule server-config { container servers { list server { key "name"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}

How the community answered

(20 responses)
  • A
    5% (1)
  • B
    5% (1)
  • D
    90% (18)

Why each option

This question requires identifying the correct YANG module definition that matches a given YANG module tree structure, focusing on the module, container, list, and key definitions.

Amodule servers-config { container servers { list server { key "servername"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}

The module name `servers-config` is incorrect, and the key `servername` is incorrect as the leaf for the key is usually named `name`.

Bmodule server-config { container server { list servers { key "name"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}

The container name `server` is incorrect; it should be `servers` for a collection. The list name `servers` is also incorrect; it should be `server` for an individual item in the list.

Cmodule server-config { container servers { list server { key "name"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}

Option C and D are identical in their structure, both correctly representing a YANG module `server-config` with a `servers` container holding a `server` list keyed by `name`.

Dmodule server-config { container servers { list server { key "name"; leaf name { type string; mandatory "true";} leaf address { type string; mandatory "true";} leaf subnet-mask { type string; mandatory "true";} leaf default-gateway { type string; mandatory "true";}}}}Correct

The correct YANG module defines the module as `server-config`, contains a `servers` container, within which is a `server` list. The list `server` uses `name` as its key, which is then defined as a `leaf` of type `string` and is `mandatory 'true'`, matching the common structure for defining a list of configurable items with a unique identifier.

Concept tested: YANG module tree to YANG definition

Source: https://datatracker.ietf.org/doc/html/rfc7950

Topics

#YANG#Data Modeling#NETCONF#Module Structure

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