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CCNA Collaboration CIVND 210-065 Official Cert Guide by Jason Ball, Brian Morgan

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NAT and Firewall-Traversal Overview

The Institute of Electrical and Electronic Engineers (IEEE) first introduced communicating using packet-switched technology in 1974. Several Internet Protocol versions were experimented with (IPv1–3) until the predominant protocol was established circa 1981, called IPv4. At the time, engineers could not imagine the four billion addresses made available with IPv4 would ever run out. Initially, anyone could purchase IP addresses in pools, and they would own them for life. Telco companies and universities were some of the main consumers of these IP addresses. As the number of devices that require an IP address greatly increased, and the World Wide Web began to expand, it was realized that the number of people ...

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