system questions

To handle JWT expiration, set an expiration time when issuing the token and verify it on each request. Use refresh tokens to obtain a new JWT without requiring the user to log in again. Store refresh tokens securely and use them to request a new JWT from the server when the original token expires. Implement token rotation to enhance security.

`react-native-fs` is a library that allows you to interact with the file system in React Native applications. It provides methods for reading, writing, and deleting files on the device's storage. This is useful for tasks like storing user data, caching files, and accessing files from different directories. It supports both iOS and Android platforms.

Vue.js uses a reactive data binding system to handle updates to the user interface automatically. When the state of a Vue instance or component changes, Vue’s reactivity system ensures that the changes are reflected in the DOM. This is achieved through a combination of getters, setters, and dependency tracking. Vue’s reactivity system leverages ES5 getters and setters to observe changes to data properties and trigger updates to the DOM as needed.

Key components of a secure login system include strong password policies, encryption for storing passwords, multi-factor authentication (MFA), secure session management, and regular security updates. Password policies should enforce complexity and length requirements, while encryption techniques like hashing with salts should be used to protect stored passwords. MFA adds an additional layer of security. Secure session management involves using secure cookies and session timeouts. Regular updates address vulnerabilities and enhance overall system security.

Interrupt requests (IRQs) are signals sent to the CPU indicating that a device needs attention. IRQs help manage hardware communication and prioritize tasks. For instance, pressing a key on the keyboard generates an IRQ to notify the OS to read the keystroke.

A file system manages the storage and retrieval of files on a disk. It organizes files into directories and handles metadata such as file size and permissions. For example, NTFS in Windows and ext4 in Linux are file systems that manage data storage and access.

Deadlock occurs when two or more processes are stuck in a state where each is waiting for the other to release resources, causing none to proceed. For instance, if two processes are each holding a lock and waiting for the other to release its lock, neither can continue.