Date First Published: 31st May 2022
Topic: Computer Networking
Subtopic: Network Identifiers
Article Type: Computer Terms & Definitions
Difficulty: AdvancedDifficulty Level: 9/10
Learn more about what host priority in this article.
Host priority is the prioritisation of different hosts. It is commonly used in DNS to specify where traffic would be directed if the first one was unavailable or if the second one was unavailable. For example, when adding an MX record to a domain name to specify which mail server is in charge of accepting mail, the hosts might be prioritised by a number.
The lower the number, the higher the priority. If the value is left empty, the default value is 0.
An example of this is: The domain name example.com needs to connect to a mail server to accept mail for that domain name and have a [email protected] email address. Three mail servers are specified below with the priority, which are:
In this example, the mail flow would go to the second exchange server, in the event that the first one was unavailable. If the second mail exchange server was unavailable, the mail flow would go to the third mail exchange server. Finally, if the third mail exchange server was unavailable, the mail flow would fail.
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