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Which is the fundamental network layer protocol for TCP/IP?

AIPv4
BIPX4
CIRC4
DIMC4
Answer & Solution
Correct answer: A. IPv4
1. The network layer is where routing happens. 2. One protocol has been fundamental to it. 3. Internet Protocol version 4 is the fundamental network layer protocol for TCP/IP. 4. So the answer is IPv4. _Source: NIST SP 800-41 Rev. 1, 'Guidelines on Firewalls and Firewall Policy'_
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