What is the default method of authentication after first initializing Vault?

Comprehensive and Detailed in Depth

After initializing Vault, the default authentication method is Tokens, specifically the root token. The

HashiCorp Vault documentation states: "After initializing, Vault provides the user the root token,

which is the only way to log in to Vault in order to configure additional auth methods." This root

token is generated during initialization and serves as the initial means of authentication until other

methods are configured.

The documentation further explains under the "Token Authentication" section: "Tokens are the core

method for authentication within Vault. Upon initialization, a root token is created which can be used

to configure Vault further." TLS certificates, GitHub, AppRole, and Userpass require additional setup,

and there’s no default Admin account method. Thus, D (Tokens) is correct.

Reference:

HashiCorp Vault Documentation - Token Authentication