Which term refers to a hostname and domain names separated by periods?

• A. Fully Qualified Domain Name (FQDN)
• B. GBIC Transceiver
• C. Grayware
• D. Hacker

Answer: (A)

This question tests how a hostname combines with the domain to form a complete, globally unique address in DNS. A hostname is the specific device name, while the domain name provides the hierarchical path in the DNS system. When you put them together with periods, from the host up through each domain level to the top-level domain, you get a fully qualified domain name. For example, server1.example.com uniquely identifies that machine within the internet’s DNS. In many contexts it can also be written with a trailing dot to indicate the root of the DNS hierarchy, as in server1.example.com., though the trailing dot is often omitted in practice. The other terms don’t relate to DNS addressing: a GBIC transceiver is a hardware module, grayware is unwanted software, and a hacker is a person.