CREST Practitioner Security Analyst (CPSA) Practice

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Which port number is associated with DNS?

Port 43
Port 53
Port 63
Port 73

The correct answer is: Port 53

The port number that is associated with DNS (Domain Name System) is 53. This is the standard port designated for both DNS queries and DNS zone transfers. DNS operates over both TCP and UDP, with UDP being primarily used for the majority of DNS queries due to its low overhead and speed. TCP is used for tasks requiring reliable delivery, such as when the response data size exceeds 512 bytes or during zone transfers between DNS servers. Understanding the significance of port 53 in the context of networking is essential, as it plays a crucial role in translating human-readable domain names into machine-readable IP addresses, thereby facilitating the navigation of the internet. In this context, the other port numbers mentioned do not correspond to DNS. Port 43 is typically used for WHOIS queries, port 63 does not have a standard service associated with it, and port 73 is used for the TFTP (Trivial File Transfer Protocol). Knowing which ports are associated with specific protocols is key for network configuration and security measures.