Which protocol is a core protocol in the TCP/IP suite?

Which protocol is a core protocol in the TCP/IP suite?

• A. IP
• B. FTP
• C. SMTP
• D. SSH

Answer: (A)

IP is the foundational protocol of the TCP/IP suite because it provides the addressing and routing that makes data travel across networks possible. It defines how packets are addressed with source and destination information and how routers forward those packets toward their target, across multiple intervening networks. This universal mechanism is what lets higher-level protocols and applications communicate over the global internet. Higher-level protocols like FTP (file transfer), SMTP (email), and SSH (secure remote login) operate on top of IP and usually use TCP as a reliable transport. They rely on IP to move their data from sender to receiver, but they don’t handle routing or packet delivery themselves. That role belongs to IP, which is why it’s considered central to the TCP/IP suite.

IP is the foundational protocol of the TCP/IP suite because it provides the addressing and routing that makes data travel across networks possible. It defines how packets are addressed with source and destination information and how routers forward those packets toward their target, across multiple intervening networks. This universal mechanism is what lets higher-level protocols and applications communicate over the global internet.

Higher-level protocols like FTP (file transfer), SMTP (email), and SSH (secure remote login) operate on top of IP and usually use TCP as a reliable transport. They rely on IP to move their data from sender to receiver, but they don’t handle routing or packet delivery themselves. That role belongs to IP, which is why it’s considered central to the TCP/IP suite.