Hour 4. The Internet Layer
What You’ll Learn in This Hour:
• IP addresses
• The IP header
• ARP
• ICMP
As you learned in the preceding hour, the computers on a single network segment such as an ethernet local area network (LAN) can communicate with each other using the physical addresses available at the Network Access layer. How, then, does an email message get from Carolina to California and arrive precisely at its destination? As you learn in this hour, the protocols at the Internet layer provide for delivery beyond the local network segment. This hour discusses the important Internet layer protocols IP, ARP, and ICMP.
The focus of this hour is on the 32-bit binary IPv4 addresses used throughout the Internet. The world is currently in transition ...
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