YANG Data Modelling

Question 1

which RFC defines YANG

Answer 1

6020

Question 2

what are the analogies for YANG

Answer 2

XML schemas and SNMP SMIs

Question 3

YANG for RESTCONF is what for SNMP

Answer 3

MIB

Question 4

YANG models are publicly available

Answer 4

true, can be found from GitHub

Question 5

what is the content of YANG model

Answer 5

header info, imports&includes, type defs, config&operational data declar., action&notific. declar

Question 6

what YANG models consist of

Answer 6

YANG modules

Question 7

what is in the header

Answer 7

author, version, namespace, prefix

Question 8

what should be globally unique

Answer 8

namespace string and version

Question 9

what is a leaf

Answer 9

it is one value without children, e.g., IP address

Question 10

what is a leaf-list

Answer 10

one value with no children, but multiple instances, e.g, DNS server list

Question 11

what are the non-leaf type nodes

Answer 11

containers and lists

Question 12

what is the function of containers

Answer 12

to organize data like put together access-timeout duration and number of re-tries

Question 13

what are lists

Answer 13

keyed sets of data, e.g. login credentials

Question 14

what is typedef

Answer 14

creates custom types like ip address for both ipv4 and v6

Question 15

what is choice

Answer 15

defines a tree of alternatives (case)

Question 16

what is grouping

Answer 16

groups together re-usable collection of nodes

Question 17

what is leafref

Answer 17

element reference

Question 18

what is rpc

Answer 18

defines what is the input and what expects as an output

Question 19

how import works

Answer 19

reference data sets from other namespaces

Question 20

how include works

Answer 20

directly pulls data sets to current namespace

Question 21

what happens when fragment is included

Answer 21

it cannot be included in any other module or namespace

Question 22

what YANG uses to organize data models

Answer 22

modules and sub-modules

Question 23

how module can import and include

Answer 23

module can import from other modules and include sub-modules