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<p>At each end of the leased line, a <a href="page.php?w=Router_%28computing%29">router</a> connects the LAN on one side with a second router within the LAN on the other. Because leased lines can be very expensive, instead of using leased lines, WANs can also be built using less costly <a href="page.php?w=circuit_switching">circuit switching</a> or <a href="page.php?w=packet_switching">packet switching</a> methods. Network <a href="page.php?w=communications_protocol">protocols</a>, including <a href="page.php?w=TCP%2FIP">TCP/IP</a>, deliver transport</p><p>
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