Tag: macOS

What does TTL mean?

TTL

TTL – meaning

Time To Live (TTL) is the value that indicates how long the data should be stored in a particular device. A lot of data pieces hold their own TTL value.

If we speak about DNS TTL, it refers to the time the DNS resolvers have to store the DNS records in their cache memory. Every DNS record also has its own TTL value. Some of them have longer TTL because the chance is less for the value to change. Yet, others have shorter TTL values, where changes more often happen. 

Here is a basic illustration of values as an orientation for your DNS records:

  • A and AAAA records – 2 hours (7200 seconds)
  • CNAME records – up to 12 hours (43200 seconds)
  • TXT records – up to 12 hours (43200 seconds)
  • MX records – 1 hour (3600 seconds)

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How does Traceroute command work?

Traceroute command

By the name of this command, you already know what it does, but let’s go a bit deeper and see precisely how the Traceroute command works. When you learn how to use the Traceroute command, you will see how useful it is and how often you will need it in your daily network’s tasks.

What is the Traceroute command?

Traceroute is one of the built-in commands inside your OS (Linux, macOS, and even on Windows as a tracert command) that serves for network diagnostic and, more specifically, for tracing the route from a point to a target.

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