Which statement describes IP as the primary network-layer protocol in the Internet protocol suite?

Which statement describes IP as the primary network-layer protocol in the Internet protocol suite?

• A. IP is the primary network-layer protocol in the Internet protocol suite.
• B. IP resolves domain names to IP addresses.
• C. IP encrypts all data in a session by default.
• D. IP is a hardware addressing standard.

Answer: (A)

IP operates at the network layer and is responsible for addressing and routing packets across interconnected networks. It assigns logical addresses (IP addresses) to devices and defines how packets are forwarded from source to destination through multiple networks. This makes IP the cornerstone of the Internet protocol suite’s network-layer functionality. DNS, which resolves domain names to IP addresses, is an application-layer service, not IP’s job. IP does not provide encryption by default—encryption can come from other mechanisms (like TLS or IPsec, but not as a built-in feature of IP). And IP is not a hardware addressing standard; hardware addresses (MAC addresses) are used at the data link layer. Therefore, describing IP as the primary network-layer protocol accurately reflects its role in addressing and routing across the Internet.

IP operates at the network layer and is responsible for addressing and routing packets across interconnected networks. It assigns logical addresses (IP addresses) to devices and defines how packets are forwarded from source to destination through multiple networks. This makes IP the cornerstone of the Internet protocol suite’s network-layer functionality.

DNS, which resolves domain names to IP addresses, is an application-layer service, not IP’s job. IP does not provide encryption by default—encryption can come from other mechanisms (like TLS or IPsec, but not as a built-in feature of IP). And IP is not a hardware addressing standard; hardware addresses (MAC addresses) are used at the data link layer.

Therefore, describing IP as the primary network-layer protocol accurately reflects its role in addressing and routing across the Internet.