Exam 200-901 topic 1 question 227 discussion

A. ospf is defined by the ietf-ospf module. yes, as can be seen on line 9 B. ietf-ospf imports ietf-routing. yes, since line 11 is referencing ietf-routing with the prefix "rt" and is an element under ospf in line 9 As someone else already mentioned here - the source: https://raw.githubusercontent.com/YangModels/yang/d297f1a59e8f9f192ea952835bc522b43840eebf/experimental/ietf-extracted-YANG-modules/[email protected] C. redistribution is a module of type cisco-ospf. no, redistribution is defined by the cisco-ospf module D. routing protocols is a list. no, routing protocols is a container, routing protocol is a list E. The main module is routing. no, the root node is routing, which is defined by the ietf-routing module

In the book to next is found this exercice, Network Programmability with YANG The Structure of Network Automation with YANG, NETCONF, RESTCONF, and gNMI (Claise... Page 310 A. ospf is defined by the ietf-ospf module- > There isnt nothing speaking about ospf, rather than it explain static routing B. ietf-ospf imports ietf-routing -> "Note that a number of namespaces other than ietf-routing’s “urn:ietf:params:xml:ns:yang:ietf-routing” are referenced in this output. These are defined in other modules that augment the ietf-routing configuration structure". So it is not imports anything in this example. You should read about "augments" in yang C. redistribution is a module of type cisco-ospf-> The module cisco-ospf is module, but redistribution isnt a module D. routing protocols is a list. -> routing protocols isnt a list. The list is routing protocol (without s) E. The main module is routing. -> The top level node is routing Based in the last, i can say by elimination B,C,D are incorrect

B&D correct, tested with yangsuite. ietf-ospf module imports "ietf-routing" and routing protocol is a list +--ro routing-protocols | | +--ro routing-protocol* [type name] | | +--ro type identityref | | +--ro name string

I think A and B A) ietf-ospf is a module and yes the module define ospf B) you can see at the link that ietf-ospf imports ietf-routing: https://raw.githubusercontent.com/YangModels/yang/d297f1a59e8f9f192ea952835bc522b43840eebf/experimental/ietf-extracted-YANG-modules/[email protected] C) redistr.... is no module D) I can't see that routing protocols is a list E) only "routing" is no module

Isn't E correct as well?

Correct Answer Should be: AC