Refer to the exhibit. An engineer tries to log in to router R1. Which configuration enables a successful login?

Question

Exhibits

Options

• AR1#username admin privilege 15
• BR1#username admin privilege 15
• CR1#netconf-yang
• DR1#aaa new-model

• A
  3% (1)
• B
  3% (1)
• C
  86% (25)
• D
  7% (2)

Explanation

Explanation

Option C (netconf-yang) is correct because the exhibit likely shows a NETCONF/YANG-based login attempt (typically over SSH port 830), and enabling netconf-yang on the router activates the NETCONF agent, which is required to allow that type of management session to succeed.

Options A and B involve creating a local username with privilege level 15, which is necessary for authentication but alone is insufficient to enable a NETCONF login - without the NETCONF service being enabled, the connection cannot be established regardless of credentials. Option D (aaa new-model) enables AAA authentication, which is also a supporting component but does not itself activate the NETCONF interface that the engineer is trying to use.

Memory Tip: Think of it this way - NETCONF needs to be "turned on" before anyone can log in through it. Just like you can't unlock a door that doesn't exist yet; netconf-yang creates the door, while usernames and AAA only determine who can walk through it.

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