Question

Suppose that we want to change the IP address of www.uga.edu from 128.192.225.20 to 128.192.224.40. We change this mapping in the DNS authoritative name server. Once this mapping is changed in the authoritative name server, will all future references in the Internet to www.uga.edu then be sent to 128.192.224.40?

Answer 1

Changing the IP address mapping in the authoritative DNS for www.uga.edu will eventually redirect all traffic to the new IP, 128.192.224.40, but due to caching and TTL, it may not be immediate.

Step-by-step explanation:

The subject of this question is Domain Name System (DNS) management, which falls under the category of Computers and Technology. After changing the IP address mapping for www.uga.edu in the authoritative name server to 128.192.224.40, not all immediate references in the Internet to this domain will be directed to the new IP address. This is due to DNS caching, which occurs in various places including local DNS resolvers, ISP DNS servers, and users' own systems. These caches might hold onto the old IP address until their respective Time To Live (TTL) values expire, at which point they will query the authoritative server again and receive the updated IP address.

Once the TTL has expired across all caching layers, all future references to the domain will indeed point to the new IP address, and traffic directed to www.uga.edu will be sent to 128.192.224.40. But until then, some users may still be directed to the old IP address 128.192.225.20. Therefore, it's important to consider the TTL and potential downtime when planning such a change.

Answer 2

NO

Step-by-step explanation:

All future references in the internet to "www.uga.edu" will not be sent to "128.192.224.40" because, Local Domain Name System (DNS) caches throughout the internet will not timeout the old mapping of “www.uga.edu” to “128.192.225.20” until the interval associated with that mapping times out. Until then the local Domain Name System (DNS) caches won’t query into the system for “www.uga.edu” and would not learn the new mapping.