Cisco ENCOR Practice Exam 2026 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

A JSON Web Token (JWT) consists of three distinct parts, which are essential for its structure and functionality. These parts are separated by periods (.) and include:

1. **Header**: This part typically contains metadata about the token, such as the type of token (JWT) and the signing algorithm being used (like HMAC SHA256 or RSA). The information in the header is Base64Url encoded to form the first part of the JWT.

2. **Payload**: The payload contains the claims or statements about an entity (typically the user) and additional data. This section can include standard claims (like `iss`, `exp`, `sub`, etc.) and custom claims defined for specific application use cases. Like the header, the payload is also Base64Url encoded to form the second part of the JWT.

3. **Signature**: The third part is the signature, which is created by taking the encoded header and payload, concatenating them with a secret (or a private key), and then signing it using the specified algorithm. This signature ensures that the token has not been altered and enables the recipient to verify the authenticity of the sender.

These three parts work together to create a secure and verifiable token used for various authentication