CompTIA Network+ Practice Test

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Master the CompTIA Network+ Exam. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your certification!

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What is a characteristic of secondary DNS servers?

They can make updates to zone information
They contain all the zone source files
They store cached information from primary DNS servers
They manage local DNS resolution

The correct answer is: They store cached information from primary DNS servers

Secondary DNS servers are designed to provide redundancy and load balancing for DNS resolution within a domain. One of their main characteristics is that they primarily store cached information from primary DNS servers. This cached information is obtained through a process called zone transfer, which occurs when a secondary server retrieves and stores a copy of the zone data from the primary server. This caching mechanism allows secondary DNS servers to respond to queries even if the primary server is unavailable, thus enhancing the reliability and speed of DNS resolutions for clients. By holding this cached information, secondary servers help distribute the DNS query load, improving overall performance and fault tolerance of the domain's DNS infrastructure. The other options do not accurately describe the role of secondary DNS servers. They do not make updates to zone information or contain all zone source files, as that responsibility primarily resides with the primary DNS server. Additionally, while they play a role in DNS resolution, they do not manage local DNS resolution directly but rather respond to queries using the cached data from the primary server.