Explanation:
When Secure Vault is not in use, all information stored in its container is encrypted.
When a user wants to use the files and notes stored within the app, they have to first decrypt the database. This happens by filling in a previously determined Security Lock - which could be a PIN or a password of the user's choosing.When a user leaves the app, it automatically encrypts everything again. This way all data stored in Secure Vault is decrypted only while a user is actively using the app. In all other instances, it remains locked to any attacker, malware or spyware trying to access the data.
How token-based authentication works: Users log in to a system and - once authenticated - are provided with a token to access other services without having to enter their username and password multiple times. In short, token-based authentication adds a second layer of security to application, network, or service access.
OAuth is an open standard for authorization used by many APIs and modern applications. The simplest example of OAuth is when you go to log onto a website and it offers one or more opportunities to log on using another website's/service's logon. You then click on the button linked to the other website, the other website authenticates you, and the website you were originally connecting to logs you on itself afterward using permission gained from the second website.

In a Cisco Unified Wireless network, the LAPs must first discover and join a WLC before they can service wireless clients.
However, this presents a question: how did the LAPs find the management IP address of the controller when it is on a different subnet?
If you do not tell the LAP where the controller is via DHCP option 43, DNS resolution of "Cisco- capwap-controller.local_domain", or statically configure it, the LAP does not know where in the network to find the management interface of the controller.
Reference: https://www.cisco.com/c/en/us/support/docs/wireless/5500-series-wireless- controllers/119286-lap-notjoin-wlc-tshoot.html

One of the best practices to secure REST APIs is using password hash. Passwords must always be hashed to protect the system (or minimize the damage) even if it is compromised in some hacking attempts. There are many such hashing algorithms which can prove really effective for password security e.g. PBKDF2, bcrypt and scrypt algorithms.
Other ways to secure REST APIs are: Always use HTTPS, Never expose information on URLs (Usernames, passwords, session tokens, and API keys should not appear in the URL), Adding Timestamp in Request, Using OAuth, Input Parameter Validation.
Reference: https://restfulapi.net/security-essentials/
We should not use MD5 or any SHA (SHA-1, SHA-256, SHA-512...) algorithm to hash password as they are not totally secure.
Note: A brute-force attack is an attempt to discover a password by systematically trying every possible combination of letters, numbers, and symbols until you discover the one correct combination that works.

The root is person, then hobbies must open a sub vector.