<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jul 17, 2017, at 11:52 AM, Henry Yeh <<a href="mailto:y2t01075187@hotmail.com" class="">y2t01075187@hotmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;" class=""><p style="margin-top: 0px; margin-bottom: 0px;" class=""></p><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class="">Hi All,</div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class="">I'm studying NDN now, and I want to ask the difference between NFD and NDN router.</div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class="">The point is that I think routers are NDN routers is due to the fact that they run NFD on them, but the following two documents make me confused.</div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class="">Page 13 of <a href="https://named-data.net/wp-content/uploads/2016/10/1-ndn-overview.pdf" target="_blank" rel="noopener noreferrer" class="">this tutorial</a> describes the Interest will check Content Store first when it enters NDN routers.</div></div></div></blockquote><div><br class=""></div>yes conceptually one should check CS firs to see whether there is a match data packet there.<br class=""><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-size: 12pt;" class=""><br class=""></span></div></div></div><blockquote type="cite" class=""><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-size: 12pt;" class="">However, the </span><a href="https://named-data.net/wp-content/uploads/2014/07/NFD-developer-guide.pdf" target="_blank" rel="noopener noreferrer" style="font-size: 12pt;" class="">technical report</a><span style="font-size: 12pt;" class=""> of NFD describes the Interest will be inserted into PIT first and then check content store.</span></div></div></div></blockquote><div><br class=""></div><div>2 clarification points:</div><div><br class=""></div><div>1/ upon receiving an interest, NFD checks PIT first to see whether it is a looping interest (not inserting into PIT), or whether the same request has been made already.</div><div><br class=""></div><div>2/ if not, then look up CS. </div><div>I believe this is just an implementation optimization (CS lookup is perhaps a bit more expensive)</div><div><br class=""></div></div><div><blockquote type="cite" class=""><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols;" class="">I think I might misunderstand them; therefore, hope you could kindly explain it for me.</span></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols;" class=""><br class=""></span></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols;" class="">Thanks,</span></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols;" class="">--</span></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols;" class=""><br class=""></span></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols;" class="">Henry</span></div><br class=""><p style="margin-top: 0px; margin-bottom: 0px;" class=""></p></div><span style="font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_______________________________________________</span><br style="font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Nfd-dev mailing list</span><br style="font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="mailto:Nfd-dev@lists.cs.ucla.edu" style="font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">Nfd-dev@lists.cs.ucla.edu</a><br style="font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="http://www.lists.cs.ucla.edu/mailman/listinfo/nfd-dev" style="font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">http://www.lists.cs.ucla.edu/mailman/listinfo/nfd-dev</a></div></blockquote></div><br class=""></body></html>