220-801 · Question #252
An administrator creates a server to be used for translating a device IP address into a network name. Which of the following ports MUST be enabled for this server?
The correct answer is B. 53. DNS (Domain Name System), which translates IP addresses to hostnames and vice versa, operates on port 53.
Question
An administrator creates a server to be used for translating a device IP address into a network name. Which of the following ports MUST be enabled for this server?
Options
- A21
- B53
- C80
- D110
How the community answered
(41 responses)- A5% (2)
- B93% (38)
- C2% (1)
Why each option
DNS (Domain Name System), which translates IP addresses to hostnames and vice versa, operates on port 53.
Port 21 is used by FTP (File Transfer Protocol) for the control connection, not for name-to-address translation services.
A server that translates device IP addresses into network names is a DNS server. DNS uses port 53 for both UDP (standard queries) and TCP (zone transfers and large responses). Port 53 must be open inbound and outbound for the DNS service to resolve queries successfully.
Port 80 is used by HTTP for unencrypted web traffic, not for DNS name resolution.
Port 110 is used by POP3 for retrieving email from a mail server, not for DNS operations.
Concept tested: DNS server port 53 for name resolution
Source: https://learn.microsoft.com/en-us/windows-server/networking/dns/dns-top
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