ITPEC FE Morning October 2020 Question 32
Which of the following is a role played by a DNS in a TCP/IP network?
Explanation
Associating domain or host names with IP addresses — DNS is the name resolution service of a TCP/IP network.
A client asks a DNS server for a name such as www. and receives its IP address; a reverse lookup maps an address back to a name. DNS is a distributed, hierarchical database: root servers point to top-level domain servers, which point to the authoritative server of each domain.
Answer (b)
Why not others:
- •(a) — leasing an unused address from a pool to a PC or printer is DHCP
- •(c) — converting private addresses used inside a company into global ones is NAT
- •(d) — calling a server program by its name alone, without knowing where it runs, is location transparency provided by middleware such as remote procedure calls; DNS names hosts, not the programs on them
Key rule: DNS answers "which address has this name", DHCP hands addresses out, and NAT rewrites them: three different jobs that all involve IP addresses.
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