Which of the following is IANA responsible for?

The Internet Assigned Numbers Authority (IANA) is responsible for managing the global IP address

pool, along with:

Allocating blocks of IP addresses to Regional Internet Registries (RIRs) such as ARIN (North America),

RIPE NCC (Europe), APNIC (Asia-Pacific), etc.

Managing autonomous system numbers (ASNs).

Overseeing DNS root zones and protocol parameters.

IANA does not assign IPs directly to enterprises or individuals — those tasks are delegated to RIRs

and ISPs.

Option A & B: Enterprises and residential allocations are handled by ISPs or RIRs.

Option D: North American IPs are managed by ARIN, not IANA.

Option C is correct – IANA manages the global IP address allocation hierarchy.

Reference:

IANA official site: https://www.iana.org

Nokia IP Fundamentals – IP Address Management and Allocation Hierarchy