CCNA专业术语表

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access layer The layer that feeds traffic into the network and performs network entry control. End users access the network via the access layer. access A that provides remote access to a corporate intranet or extranet over a shared infrastructure with the same policies as a private network. accounting (auditing) The process of keeping track of a user’s activity while accessing a network’s resources, including the amount of time spent in the network, the services accessed while there, and the amount of data transferred during the session. ACL (access control list) A set of data that informs a computer’s operating system which permissions, or access rights, that each user or group has to a specific system object, such as a directory or file. A means for controlling or limiting network traffic. An ACL compares different criteria to a defined rule set.
CCNA专业术语表 中英.rar
  • CCNA专业术语表 中英
  • APPENDIX C.PDF
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内容介绍
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta charset="utf-8"><meta name="generator" content="pdf2htmlEX"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/css/base.min.css"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/5712101/raw.css"><script src="https://csdnimg.cn/release/download_crawler_static/js/compatibility.min.js"></script><script src="https://csdnimg.cn/release/download_crawler_static/js/pdf2htmlEX.min.js"></script><script>try{pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({});}catch(e){}</script><title></title></head><body><div id="sidebar" style="display: none"><div id="outline"></div></div><div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/5712101/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">APPENDIX C</div><div class="t m0 x2 h3 y2 ff2 fs1 fc0 sc0 ls0 ws0">Glossary of Key T<span class="_ _0"></span>erms</div><div class="t m0 x3 h4 y3 ff3 fs2 fc1 sc0 ls0 ws0">10B<span class="_ _1"></span>ASE5<span class="_ _2"> </span><span class="ff4 fc2">10-Mbps baseband Ethernet </span></div><div class="t m0 x3 h4 y4 ff4 fs2 fc2 sc0 ls0 ws1">speci&#64257;cation using standard (thick) 50-ohm baseband </div><div class="t m0 x3 h4 y5 ff4 fs2 fc2 sc0 ls0 ws0">coaxial cable. 10B<span class="_ _1"></span>ASE5, which is part of the IEEE </div><div class="t m0 x3 h4 y6 ff4 fs2 fc2 sc0 ls0 ws0">802.3 baseband physical layer speci&#64257;cation, has a </div><div class="t m0 x3 h4 y7 ff4 fs2 fc2 sc0 ls0 ws0">distance limit of 500m (1640 ft.) per segment. </div><div class="t m0 x3 h4 y8 ff3 fs2 fc1 sc0 ls0 ws0">10B<span class="_ _1"></span>ASE-T<span class="_ _2"> </span><span class="ff4 fc2">10-Mbps baseband Ethernet </span></div><div class="t m0 x3 h4 y9 ff4 fs2 fc2 sc0 ls0 ws0">speci&#64257;cation using two pairs of twisted-pair cabling </div><div class="t m0 x3 h4 ya ff4 fs2 fc2 sc0 ls0 ws0">(Category 3, 4, or 5): one pair for transmitting data </div><div class="t m0 x3 h4 yb ff4 fs2 fc2 sc0 ls0 ws2">and the other for recei<span class="_ _1"></span>ving data. 10B<span class="_ _1"></span>ASE-T<span class="_ _3"></span>, which is </div><div class="t m0 x3 h4 yc ff4 fs2 fc2 sc0 ls0 ws0">part of the IEEE 802.3 speci&#64257;cation, has a distance </div><div class="t m0 x3 h4 yd ff4 fs2 fc2 sc0 ls0 ws0">limit of approximately 100m (328 ft.) per segment. </div><div class="t m0 x3 h4 ye ff3 fs2 fc1 sc0 ls0 ws0">10-Gb Ethernet<span class="_ _2"> </span><span class="ff4 fc2">Built on the Ethernet technology </span></div><div class="t m0 x3 h4 yf ff4 fs2 fc2 sc0 ls0 ws0">used in most of today&#8217;<span class="_ _4"></span>s LANs, 10-Gb Ethernet is </div><div class="t m0 x3 h4 y10 ff4 fs2 fc2 sc0 ls0 ws3">described as a technology that of<span class="_ _1"></span>fers a more ef<span class="_ _1"></span>&#64257;cient </div><div class="t m0 x3 h4 y11 ff4 fs2 fc2 sc0 ls0 ws0">and less expensi<span class="_ _4"></span>ve approach to moving data on </div><div class="t m0 x3 h4 y12 ff4 fs2 fc2 sc0 ls0 ws4">backbone connections between networks, while also </div><div class="t m0 x3 h4 y13 ff4 fs2 fc2 sc0 ls0 ws0">providing a consistent technology end to end. </div><div class="t m0 x3 h4 y14 ff4 fs2 fc2 sc0 ls0 ws5">Ethernet no<span class="_ _1"></span>w can step up to of<span class="_ _1"></span>fering data speeds at 10 </div><div class="t m0 x3 h4 y15 ff4 fs2 fc2 sc0 ls0 ws0">Gbps.</div><div class="t m0 x3 h4 y16 ff3 fs2 fc1 sc0 ls0 ws0">100B<span class="_ _1"></span>ASE-FX<span class="_ _2"> </span><span class="ff4 fc2">100-Mbps baseband Fast Ethernet </span></div><div class="t m0 x3 h4 y17 ff4 fs2 fc2 sc0 ls0 ws0">speci&#64257;cation using two strands of multimode &#64257;ber<span class="_ _1"></span>-</div><div class="t m0 x3 h4 y18 ff4 fs2 fc2 sc0 ls0 ws0">optic cable per link. T<span class="_ _3"></span>o guarantee proper signal </div><div class="t m0 x3 h4 y19 ff4 fs2 fc2 sc0 ls0 ws0">timing, a 100B<span class="_ _4"></span>ASE-FX link cannot exceed 400m </div><div class="t m0 x3 h4 y1a ff4 fs2 fc2 sc0 ls0 ws0">(1312 ft.) in length. It is based on the IEEE 802.3 </div><div class="t m0 x3 h4 y1b ff4 fs2 fc2 sc0 ls0 ws0">standard. </div><div class="t m0 x3 h4 y1c ff3 fs2 fc1 sc0 ls0 ws0">100B<span class="_ _1"></span>ASE-TX<span class="_ _2"> </span><span class="ff4 fc2">100-Mbps baseband Fast Ethernet </span></div><div class="t m0 x3 h4 y1d ff4 fs2 fc2 sc0 ls0 ws0">speci&#64257;cation using two pairs of either UTP or STP </div><div class="t m0 x3 h4 y1e ff4 fs2 fc2 sc0 ls0 ws6">wiring. The &#64257;rst pair of wires is used to recei<span class="_ _4"></span>ve data; </div><div class="t m0 x3 h4 y1f ff4 fs2 fc2 sc0 ls0 ws0">the second is used to transmit. T<span class="_ _3"></span>o guarantee proper </div><div class="t m0 x3 h4 y20 ff4 fs2 fc2 sc0 ls0 ws0">signal timing, a 100B<span class="_ _4"></span>ASE-TX segment cannot </div><div class="t m0 x3 h4 y21 ff4 fs2 fc2 sc0 ls0 ws0">exceed 100m (328 ft.) in length. It is based on the </div><div class="t m0 x3 h4 y22 ff4 fs2 fc2 sc0 ls0 ws0">IEEE 802.3 standard. </div><div class="t m0 x4 h4 y23 ff3 fs2 fc1 sc0 ls0 ws0">10B<span class="_ _1"></span>ASE2<span class="_ _2"> </span><span class="ff4 fc2">10-Mbps baseband Ethernet </span></div><div class="t m0 x4 h4 y24 ff4 fs2 fc2 sc0 ls0 ws0">speci&#64257;cation using 50-ohm thin coaxial cable. </div><div class="t m0 x4 h4 y25 ff4 fs2 fc2 sc0 ls0 ws0">10B<span class="_ _4"></span>ASE2, which is part of the IEEE 802.3 </div><div class="t m0 x4 h4 y26 ff4 fs2 fc2 sc0 ls0 ws0">speci&#64257;cation, has a distance limit of 185m (606 ft.) </div><div class="t m0 x4 h4 y27 ff4 fs2 fc2 sc0 ls0 ws0">per segment. </div><div class="t m0 x4 h4 y28 ff3 fs2 fc1 sc0 ls0 ws0">1000B<span class="_ _1"></span>ASE-LX<span class="_ _2"> </span><span class="ff4 fc2">1000-Mbps baseband Gigabit </span></div><div class="t m0 x4 h4 y29 ff4 fs2 fc2 sc0 ls0 ws0">Ethernet speci&#64257;cation using a long wa<span class="_ _1"></span>velength for a </div><div class="t m0 x4 h4 y2a ff4 fs2 fc2 sc0 ls0 ws7">long-haul, &#64257;ber-optic cable for a maximum length of </div><div class="t m0 x4 h4 y2b ff4 fs2 fc2 sc0 ls0 ws0">10,000m (32808.4 ft.).</div><div class="t m0 x4 h4 y2c ff3 fs2 fc1 sc0 ls0 ws0">1000B<span class="_ _1"></span>ASE-SX<span class="_ _2"> </span><span class="ff4 fc2">1000-Mbps baseband Gigabit </span></div><div class="t m0 x4 h4 y2d ff4 fs2 fc2 sc0 ls0 ws8">Ethernet speci&#64257;cation using a short laser wa<span class="_ _1"></span>velength </div><div class="t m0 x4 h4 y2e ff4 fs2 fc2 sc0 ls0 ws9">on multimode &#64257;ber-optic cable for a maximum length </div><div class="t m0 x4 h4 y2f ff4 fs2 fc2 sc0 ls0 ws0">of 550m (1804.5 ft.).</div><div class="t m0 x4 h4 y30 ff3 fs2 fc1 sc0 ls0 ws0">1000B<span class="_ _1"></span>ASE-T<span class="_ _2"> </span><span class="ff4 fc2">1000-Mbps baseband Gigabit </span></div><div class="t m0 x4 h4 y31 ff4 fs2 fc2 sc0 ls0 wsa">Ethernet speci&#64257;cation using four pairs of Category 5 </div><div class="t m0 x4 h4 y32 ff4 fs2 fc2 sc0 ls0 ws0">UTP cable for a maximum length of 100m (328 ft.).</div><div class="t m0 x4 h4 y33 ff3 fs2 fc1 sc0 ls0 ws0">4D-P<span class="_ _3"></span>AM5<span class="_ _2"> </span><span class="ff4 fc2">The symbol-encoding method used in </span></div><div class="t m0 x4 h4 y34 ff4 fs2 fc2 sc0 ls0 ws0">1000B<span class="_ _4"></span>ASE-T<span class="_ _4"></span>. The four<span class="_ _4"></span>-dimensional (4D) quinary </div><div class="t m0 x4 h4 y35 ff4 fs2 fc2 sc0 ls0 wsb">symbols recei<span class="_ _1"></span>ved from the 8B1Q4 data encoding are </div><div class="t m0 x4 h4 y36 ff4 fs2 fc2 sc0 ls0 ws0">transmitted using &#64257;ve v<span class="_ _4"></span>oltage levels (P<span class="_ _5"></span>AM5). Four </div><div class="t m0 x4 h4 y37 ff4 fs2 fc2 sc0 ls0 ws0">symbols are transmitted in parallel each symbol </div><div class="t m0 x4 h4 y38 ff4 fs2 fc2 sc0 ls0 ws0">period. </div><div class="t m0 x4 h4 y39 ff3 fs2 fc1 sc0 ls0 ws0">8B1Q4<span class="_ _2"> </span><span class="ff4 fc2">For IEEE 802.3, the data-encoding </span></div><div class="t m0 x4 h4 y3a ff4 fs2 fc2 sc0 ls0 ws0">technique used by 1000B<span class="_ _4"></span>ASE-T when conv<span class="_ _4"></span>erting </div><div class="t m0 x4 h4 y3b ff4 fs2 fc2 sc0 ls0 ws0">GMII data (8B-8 bits) to four quinary symbols (Q4) </div><div class="t m0 x4 h4 y3c ff4 fs2 fc2 sc0 ls0 ws0">that are transmitted during one clock (1Q4). </div><div class="t m0 x4 h4 y3d ff3 fs2 fc1 sc0 ls0 ws0">ackno<span class="_ _4"></span>wledgment<span class="_ _2"> </span><span class="ff4 fc2">Noti&#64257;cation sent from one </span></div><div class="t m0 x4 h4 y3e ff4 fs2 fc2 sc0 ls0 wsc">network de<span class="_ _4"></span>vice to another to acknowledge that some </div><div class="t m0 x4 h4 y3f ff4 fs2 fc2 sc0 ls1 ws0">ev<span class="ls0">ent (for example, receipt of a message) occurred. </span></div><div class="t m0 x4 h4 y40 ff4 fs2 fc2 sc0 ls0 ws0">Sometimes abbre<span class="_ _1"></span>viated <span class="_ _4"></span>A<span class="_ _4"></span>CK.</div><div class="t m0 x5 h5 y41 ff4 fs3 fc3 sc0 ls0 ws0">0CCNA1and2.book Page 985 Tuesday, June 29, 2004 1:55 PM</div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div></body></html>
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