TTL is definitely necessary if you use the Domain Name System. It functions similarly to an expiration date for DNS records. We’ll see its purpose, its application in the DNS, and how long Time-to-Live takes. So, without further ado, let’s get down to business.
The time-to-live (TTL) parameter defines how long a data packet will stay alive after being sent across multiple hops. Either in-network memory or in cache memory. The data packet will be terminated when the timer expires or reaches its hop limit. Data packets vary in size, shape, and content, but they all have the same time-to-live. That time should be computed based on how long data packets must stay in a device to complete their missions.