The Importance of DNS TTL Value in DNS Resolution

DNS TTL (Time to Live) value plays a crucial role in DNS resolution by determining how long DNS records can be cached by recursive servers, ISPs, and clients.

Impact on DNS Resolution

When a DNS query is made, the resolver first checks its cache for the corresponding DNS record. If the record's TTL has not expired, the resolver can use the cached record, speeding up the resolution process and reducing the load on authoritative DNS servers.

However, if the TTL value has expired, the resolver is required to query the authoritative DNS server again to obtain the updated record. This can lead to a slightly longer resolution time, especially for websites with a low TTL value.

Overall, the TTL value ensures efficient DNS resolution while balancing the need for up-to-date information with the benefits of caching previously resolved DNS records.