Internet protocols and addressing – UGC NET Question

Statements A, B, C and E provide a correct overview of core Internet protocols, whereas D and F are inaccurate. IP addresses identify devices at the network layer, DNS resolves domain names and HTTP delivers web content. IPv4 and IPv6 are recognised versions of IP. IP addresses can change over time due to reassignment or dynamic allocation, and MAC addresses operate at the data-link layer and are not routed like IP, so D and F must be excluded.

Option A:
Option A is incorrect because it omits C, thereby ignoring the role of HTTP in transferring web pages. Without C, the set fails to represent an important application-layer protocol used daily on the Internet. Even though A, B and E are true, the combination is incomplete.

Option B:
Option B is correct because it includes the full set of accurate statements about addressing, name resolution, web transfer and protocol versions. It excludes D, which wrongly claims addresses never change, and F, which confuses MAC and IP behaviour. This makes Option B the only combination that matches all correct statements.

Option C:
Option C is incorrect because it includes F, which states that MAC addresses can be freely routed over the Internet. MAC addresses are used within local networks and do not function as routable identifiers in the same way as IP addresses. The presence of F makes this set invalid.

Option D:
Option D is incorrect because it omits B and includes F. Removing DNS from the set leaves out the key name-resolution mechanism, while accepting F misrepresents how MAC addresses operate. Therefore this option cannot be considered correct.