What is the standard port number used by the Domain Name System (DNS) for name resolution queries?
DNS queries use UDP (and TCP for zone transfers) on standard port 53.
Which DNS resource record (RR) type maps a domain name to its corresponding IPv4 address?
An 'A' record maps an FQDN to a 32-bit IPv4 address. 'AAAA' maps to a 128-bit IPv6 address, and 'CNAME' provides an alias to another canonical domain name.
Which DNS resource record type maps a domain name directly to an IPv4 address?
An A record maps a domain name to an IPv4 address. MX, PTR, and NS records serve different purposes, so none of the listed records is correct.
Which DNS record type is used to perform Reverse DNS Lookups (resolving an IP address back to a domain name)?
Pointer (PTR) records map IP addresses to canonical domain names in the in-addr.arpa (IPv4) and ip6.arpa (IPv6) reverse lookup zones.
What are the standard default port numbers used by Hypertext Transfer Protocol (HTTP) and Secure HTTP (HTTPS) respectively?
HTTP runs unencrypted over TCP port 80, whereas HTTPS encrypts communications using TLS/SSL over TCP port 443.