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==Explanation==
In the early 1990s, the Internet is still largely wired. To achieve anytime anywhere computing, computers must be able to
ABR is an on-demand routing protocol, i.e., routes are created only as and when needed. This, in contrast, to the existing Internet▼
connect to each other wirelessly and automatically. The [[Internet Protocol]] at that time did not address mobility, and the formation
where routes are immediately available and routing tables are constantly updated. According to the publications<ref name="auto">[[Chai Keong Toh]] Ad Hoc Mobile Wireless Networks, Prentice Hall Publishers, 2002. ISBN 978-0-13-007817-9</ref>, on-demand routing is chosen because▼
of an rapidly deployable mobile Internet. The underlying protocols for Internet were TCP/UDP/IP. Those protocols do not support
spontaneous network creation, and do not handle dynamics due to mobility of computers. The assumption was end host are static host,
and they do not move. Another assumption was the network is wired (with copper wires or fiber).
Since existing Internet protocols cannot support ad hoc mobile computing, a new mobile Internet is need. This calls for a new network
layer software that will enable anytime and anywhere mobile computing, while at the same time, retains compatibility with IP/UDP/TCP
▲protocols already present in the wired Internet. ABR is an on-demand routing protocol, i.e., routes are created only as and when needed.
▲This, in contrast, to the existing Internet where routes are immediately available and routing tables are constantly updated among routers. According to the publications<ref name="auto">[[Chai Keong Toh]] Ad Hoc Mobile Wireless Networks, Prentice Hall Publishers, 2002. ISBN 978-0-13-007817-9</ref>, on-demand routing is chosen because it can reduce the amount of control packet traffic and this is suitable for a wireless network because bandwidth is limited.
==ABR Route Discovery Phase==
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