David is switching on the computers on his network for the first time after a power outage. A DNS client submits a recursive query to a local DNS server to resolve an Internet name. The server for this Internet name is not authoritative. Which of the following occurs first in this case?
A)The DNS server contacts root servers configured in the cache.dns file.
B)The DNS client resolves the name from its cache.
C)The DNS server resolves the name from its cache.
D)The DNS server forwards the recursive query to an upstream DNS server.

Question

Quizplus · Accepted Answer

The DNS server contacts the root servers configured in the cache.dns file.
Key Takeaway: The cache.dns lists the root servers on the Internet. This file contains DNS resource records that prime the local cache of the server with the addresses of authoritative root servers for the Internet. This file is used to preload resource records into the DNS server names cache. DNS servers use this file to help locate root servers on either a network or the Internet.

David Is Switching on the Computers on His Network for the First