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300-420 · Question #177

An engineer must use YANG with an XML representation to configure a Cisco IOS XE switch with these specifications: - IP address 10.10.10.10/27 configured on the interface GigabitEthernet2/1/0…

The correct answer is D. <interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>true</enabled> <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>. This question requires identifying the correct XML representation using YANG for configuring an IP address on a Cisco IOS XE interface, adhering to standard IETF YANG models and proper XML syntax.

Automation

Question

An engineer must use YANG with an XML representation to configure a Cisco IOS XE switch with these specifications:

  • IP address 10.10.10.10/27 configured on the interface

GigabitEthernet2/1/0

  • connectivity from a directly connected host 10.10.10.1/27

Which YANG data model set must the engineer choose? A. B. C. D.

Exhibits

300-420 question #177 exhibit 1
300-420 question #177 exhibit 2
300-420 question #177 exhibit 3
300-420 question #177 exhibit 4

Options

  • A<interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>false</enabled> <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>
  • B<interfaces YANG="urn:ietf:params:xml:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type YANG:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>true</enabled> <ipv4 YANG="urn:ietf:params:xml:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>
  • C<interfaces json="urn:ietf:params:json:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type json:ianaift="urn:ietf:params:json:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>true</enabled> <ipv4 json="urn:ietf:params:json:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>
  • D<interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>true</enabled> <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>

How the community answered

(33 responses)
  • A
    15% (5)
  • B
    6% (2)
  • C
    3% (1)
  • D
    76% (25)

Why each option

This question requires identifying the correct XML representation using YANG for configuring an IP address on a Cisco IOS XE interface, adhering to standard IETF YANG models and proper XML syntax.

A<interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>false</enabled> <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>

Option A sets `<enabled>false</enabled>`, which would administratively shut down the interface and prevent it from providing connectivity.

B<interfaces YANG="urn:ietf:params:xml:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type YANG:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>true</enabled> <ipv4 YANG="urn:ietf:params:xml:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>

Option B incorrectly uses `YANG=` instead of `xmlns=` for declaring XML namespaces, which is syntactically invalid for standard XML.

C<interfaces json="urn:ietf:params:json:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type json:ianaift="urn:ietf:params:json:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>true</enabled> <ipv4 json="urn:ietf:params:json:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>

Option C incorrectly uses `json=` and `json:ianaift` attributes, suggesting a JSON format, whereas the question explicitly specifies an XML representation.

D<interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"> <interface> <name>GigabitEthernet2/1/0</name> <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type> <enabled>true</enabled> <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"> <address> <ip>10.10.10.10</ip> <netmask>255.255.255.224</netmask> </address> </ipv4> </interface> </interfaces>Correct

Option D correctly configures the `GigabitEthernet2/1/0` interface with the IP address `10.10.10.10` and the corresponding `/27` subnet mask `255.255.255.224`. Crucially, it sets `<enabled>true</enabled>` to activate the interface for connectivity and uses the proper `xmlns` attribute for XML namespace declarations.

Concept tested: IETF interface and IP configuration via YANG XML

Source: https://datatracker.ietf.org/doc/html/rfc8343

Topics

#YANG#Network Automation#IOS XE Configuration#Data Models

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