b.html
来自「ccna」· HTML 代码 · 共 1,051 行 · 第 1/5 页
HTML
1,051 行
<html><head><meta http-equiv="Content-Type" content="text/html; charset=windows-1252"><meta name="GENERATOR" content="Microsoft FrontPage 4.0"><meta name="ProgId" content="FrontPage.Editor.Document"><title>New Page 3</title><base target="_self"></head><body background="../../images/bgindex.gif" bgcolor="#F7DB7B" leftmargin=20 topmargin=10 marginwidth="20" marginheight="10"> <table border="0" width="420" cellspacing="0" cellpadding="2"> <tr> <td valign="top"> <p align="left"><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF25146"><b><font size="2" face="Arial">B8ZS</font></b></a><font size="2" face="Arial"><br> </font></p> <dl> <dd><font face="Arial"><strong><font size="2">Binary 8-zero substitution</font></strong><font size="2">. Line-code type, used on T1 and E1 circuits, in which a special code is substituted whenever 8 consecutive zeros are sent through the link. This code is then interpreted at the remote end of the connection. This technique guarantees ones density independent of the data stream. Sometimes called <i>bipolar 8-zero substitution</i>. Compare with <a href="a.html#REF34415"><i>AMI</i></a>. See also <a href="o.html#REF36881"><i>ones density</i></a>.<br> </font></font></dd> </dl> <p><font size="2" face="Arial"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>backbone</b><br> </font> <dl> <dd><font size="2" face="Arial">The part of a network that acts as the primary path for traffic that is most often sourced from, and destined for, other networks.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><a name="bbonec"><b><font size="2">backbone cabling</font></b></a><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">Cabling that provides interconnections between wiring closets, wiring closets and the POP, and between buildings that are part of the same LAN. See <a href="v.html#vertcab"><i>vertical cabling</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><a name="REF20310"><b><font size="2">back end</font></b></a><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">Node or software program that provides services to a front end. See also <a href="c.html#REF41448"><i>client</i></a>, <a href="f.html#REF33368"><i>front end</i></a>, and <a href="s.html#REF14320"><i>server</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">backoff</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">The retransmission delay enforced when a collision occurs.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">backplane</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">Physical connection between an interface processor or card and the data buses and power distribution buses inside a Cisco chassis.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">back pressure</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">Propagation of network congestion information upstream through an internetwork.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">backward explicit congestion notification</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">See <a href="b.html#REF12789"><i>BECN</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">backward learning</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">Algorithmic process used for routing traffic that surmises information by assuming symmetrical network conditions. For example, if node A receives a packet from node B through intermediate node C, the backward-learning routing algorithm will assume that A can optimally reach B through C.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">balanced configuration</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">In HDLC, a point-to-point network configuration with two combined stations.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">balanced, unbalanced</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">See <a href="b.html#REF25039"><i>balun</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><a name="REF25039"><b><font size="2">balun</font></b></a><font size="2"><br> </font></font> <dl> <dd><font face="Arial"><strong><font size="2">Balanced, unbalanced</font></strong><font size="2">. Device used for matching impedance between a balanced and an unbalanced line, usually twisted-pair and coaxial cable.<br> </font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">bandwidth</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">The difference between the highest and lowest frequencies available for network signals. The term is also used to describe the rated throughput capacity of a given network medium or protocol.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">bandwidth allocation</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">See <a href="b.html#REF42321"><i>bandwidth reservation</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><a name="REF42321"><b><font size="2">bandwidth reservation</font></b></a><font size="2"><br> </font></font></p> <blockquote> <p><font size="2" face="Arial">Process of assigning bandwidth to users and applications served by a network. Involves ssigning priority to different flows of traffic based on how critical and delay-sensitive they are. This makes the best use of available bandwidth, and if the network becomes congested, lower-priority traffic can be dropped. Sometimes called <i>bandwidth allocation</i>. See also <a href="c.html#REF28192"><i>call priority</i></a>.<br> </font></p> </blockquote> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">banner motd</font></b></p> <blockquote> <p><font size="2" face="Arial">Command used to configure a message of the day which is displayed at login and is useful for conveying messages that affect all network users, such as impending system shutdowns.<br> </font></p> </blockquote> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">Banyan VINES</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF31096"><i>VINES</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><a name="REF21502"><b><font size="2">BARRNet</font></b></a><font size="2"><br> </font></font> <dl> <dd><font face="Arial"><strong><font size="2">Bay Area Regional Research Network</font></strong><font size="2">. Regional network serving the San Francisco Bay Area. The BARRNet backbone is composed of four University of California campuses (Berkeley, Davis, Santa Cruz, and San Francisco), Stanford University, Lawrence Livermore National Laboratory, and NASA Ames Research Center. BARRNET is now part of BBN Planet. See also <a href="b.html#REF28505"><i>BBN Planet</i></a>.<br> </font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><a name="REF29688"><b><font size="2">baseband</font></b></a><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">Characteristic of a network technology where only one carrier frequency is used. Ethernet is an example of a baseband network. Also called <i>narrowband</i>. Contrast with <a href="b.html#REF18532"><i>broadband</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><a name="REF22876"><b><font size="2">bash</font></b></a><font size="2"><br> </font></font> <dl> <dd><font face="Arial"><strong><font size="2">Bourne-again shell</font></strong><font size="2">. Interactive UNIX shell based on the traditional Bourne shell, but with increased functionality. The LynxOS bash shell is presented when you log in to a LightStream 2020 ATM switch as root (bash#) or fldsup (bash$). See also <a href="f.html#REF36698"><i>fldsup account</i></a> and <a href="r.html#REF34795"><i>root account</i></a>.<br> </font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><font face="Arial"><b><font size="2">basic configuration</font></b><font size="2"><br> </font></font> <dl> <dd><font size="2" face="Arial">The minimal configuration information entered when a new router, switch, or other configurable network device is installed on a network. The basic configuration for a LightStream 2020 ATM switch, for example, includes IP addresses, the date, and parameters for at least one trunk line. The basic configuration enables the device to receive a full configuration from the NMS.<br>⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?