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Packet Layer Protocol
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<h2 id="external-links">External links</h2> <ul><li><a href="https://web.archive.org/web/20180711111315/http://docwiki.cisco.com:80/wiki/X.25">X.25 in Cisco System's <i>DocWiki</i></a> at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a> (archived 2018-07-11)</li></ul>