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			'title' => '交换机和路由器的区别是什么？',
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			'addtime' => '2018-12-27 14:59:23',
			'neirong' => '<p>
	&nbsp; &nbsp; &nbsp; 交换机和路由器的区别在哪里?我相信很多人都在疑惑这个问题，那么接下来就就告诉你<span>上<strong><a href="http://r-best.cn/Chan/Show?id=180" target="_blank">海思科工业交换机</a></strong>和路由器的区别。</span>
</p>
<p>
	交换机是一种基于MAC（网卡硬件地址）标识的网络设备，能够完成数据包的封装和转发功能。交换机可以“学习”MAC地址并将它们存储在内部地址表中。通过在数据帧的发起者和目标接收器之间建立临时交换路径，数据帧可以直接从源地址到达目的地地址。<span><strong><a href="http://r-best.cn/Chan/Show?id=180" target="_blank">上海思科工业交换机</a></strong>是你的不二之选。</span>
</p>
<p style="text-align:center;">
	<span><img src="/HT_flies/js/kindeditor/attached/image/20181227/20181227150700_87670.jpg" alt="" /><br />
</span>
</p>
路由器相当于邮局将不同的信件分发到不同的地方。<br />
网络路由是从不同的网站向不同的网站发送数据。ADSL的主要应用有：<br />
对Internet外部网络的访问请求由LAN网络发起。然后Internet网络上相应的主机响应。然后发送回数据。发送给广告公司后。如果你不去，你就不能进入局域网。但是ADSL路由可以记住LAN中的哪个主机刚刚发出请求，因此它将数据从Internet转发到LAN中的相应计算机，从而实现许多计算机一起连接到Internet。<br />
<p>
	目前，ADSL路由器都是由一个ADSL驱动多台计算机接入互联网和qq，并等待网络应用。
</p>
<p>
	选择好的交换机就选<strong><a href="http://r-best.cn/Chan/Show?id=180" target="_blank">上海思科工业交换机</a></strong>。
</p>',
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			'laiyuan' => '',
			'addtime' => '2018-12-19 16:17:43',
			'neirong' => '<p>
	你知道什么是交换机么？交换机可以做什么？<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>来为你讲述：工业交换机，也称作工业以太网交换机，即应用于工业控制领域的以太网交换机设备，由于采用的网络标准，其开放性好、应用广泛以及价格低廉、使用的是透明而统一的TCP/IP协议，以太网已经成为工业控制领域的主要通信标准。
</p>
<p style="text-align:center;">
	<img src="/HT_flies/js/kindeditor/attached/image/20181219/20181219162125_71762.jpg" alt="" /> 
</p>
工业交换机具有电信级性能特征，可耐受严苛的工作环境。产品系列丰富，端口配置灵活，可满足各种工业领域的使用需求。产品采用宽温设计，防护等级不低于IP30，支持标准和私有的环网冗余协议。<br />
<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>作用有哪些？<br />
工 业以太网交换机主要是应用于复杂的工业环境中的实时以太网数据传输。以太网在设计时，由于其采用载波侦听多路复用冲突检测（CSMA/CD机制），在复杂的工业环境中应用，其可靠性大大降低，从而导致以太网不能使用。工业以太网交换机采用存储转换交换方式，同时提高以太网通信速度，并且内置智能报警设计监控网络运行状况，使得在恶劣危险的工业环境中保证以太网可靠稳定的运行。<br />
<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>也称作工业以太网交换机，即应用于工业控制领域的以太网交换机设备，由于采用的网络标准，其开放性好、应用广泛以及价格低廉、使用的是透明而统一的TCP/IP协议，以太网已经成为工业控制领域的主要通信标准。<br />
<p>
	工业交换机具有电信级性能特征，可耐受严苛的工作环境。产品系列丰富，端口配置灵活，可满足各种工业领域的使用需求。产品采用宽温设计，防护等级不低于IP30，支持标准和私有的环网冗余协议。
</p>
<p>
	选择<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>就选瑞博思特。
</p>',
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			'addtime' => '2018-12-12 14:47:42',
			'neirong' => '<p>
	&nbsp; &nbsp; &nbsp; &nbsp;你知道什么是工业交换机么？瑞博思特（北京）科技有限公司为你讲述什么是<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科</a></strong>工业交换机
</p>
<p>
	&nbsp; &nbsp; &nbsp; <span><strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科</a></strong>工业交换机</span>通过弹性、易于部署的交换机支撑物联网的扩展
</p>
<p style="text-align:center;">
	<img src="/HT_flies/js/kindeditor/attached/image/20181212/20181212145337_33576.jpg" alt="" />
</p>
&nbsp; &nbsp; &nbsp; 一家制造业企业通过提高工厂和 IT 基础架构的灵活程度和集成水平，把交付订单的时间缩短了25%。一家交通运输企业在轨道和机车系统上部署了大量传感器，一旦轨道信号系统出现故障，系统就会在故障引发严重事故前发出警报。还有一家电力公司，其定位故障位置的速度和恢复服务的速度都比之前提高了20%。<br />
&nbsp; &nbsp; &nbsp; 将上海思科工业级以太网（IE）交换机作为集成的、融合信息技术（IT）和操作技术（OT）网络的一部分来部署，企业就有可能获得上述成就。在物联网（IoT）时代，随着终端设备和传感器的数量不断增多，企业网络也在急剧扩展，思科工业级以太网交换机会帮助企业抓住新的机遇，获得更高的效率。<br />
&nbsp; &nbsp; &nbsp; 据 IDC 的一项调查表明，“截至2013年底，已有91亿台 IoT 设备完成了安装部署，预计到2020年，这一数字将以17.5%的年复合增长率增长至281亿台。1”<br />
&nbsp; &nbsp; &nbsp; 加固型思科 IE 交换机构成了一系列广泛的技术工业应用和流程的网络基础架构基础，比如：工厂自动化智能型交通运输系统变电站自动化采矿作业<br />
油气冶炼和输送系统各种监测和远程监控功能<br />
<p>
	&nbsp; &nbsp; &nbsp; <strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科</a></strong>IE交换机集可靠性与高可用性技术于一体，不仅能帮助企业快速扩展不断增加的网络端点和应用，与此同时，还能保证整张网络的弹性。思科推出的网络即传感器（network- as-a-sensor）方案将网络安全的概念整合进整个网络，不仅在最大程度上确保了网络安全可视性和可控性，针对网络流量提供有价值的分析洞察，还能对网络内的所有活动进行持续监控。
</p>
<p>
	选择<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科</a></strong>工业交换机就来瑞博思特
</p>',
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			'title' => '防火墙的选择至关重要',
			'zuozhe' => '',
			'laiyuan' => '',
			'addtime' => '2018-12-10 14:13:54',
			'neirong' => '<p>
	&nbsp; &nbsp; &nbsp; 防火墙是什么？它有什么作用呢？这些你都知道么？<strong><a href="http://http://r-best.cn/Chan/Index?ids=3" target="_blank">瑞博思特（北京）科技有限公司</a></strong>为您讲解，专业防火墙知识。
</p>
<p>
	&nbsp; &nbsp; &nbsp;<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank"> 瑞博思特（北京）科技有限公司</a></strong>告诉您所谓防火墙是指在内部和外部网络、专用网络和公共网络之间的边界上构建的软硬件设备组成的保护屏障。它是一种图像的安全方法。它是计算机硬件和软件的结合，使Internet和Intranet融为一体。安全网关保护内部网免受非法用户的攻击。防火墙由四个部分组成：服务访问规则、身份验证工具、包过滤和应用网关。防火墙是计算机和它连接的网络之间的软件或硬件。流入和流出计算机的所有网络通信和数据包都通过防火墙。
</p>
<p>
	<img src="/HT_flies/js/kindeditor/attached/image/20181210/20181210142811_68194.jpg" alt="" />
</p>
&nbsp; &nbsp; &nbsp; 在网络中，所谓的“防火墙”指的是一种将内部网与公共接入网（如因特网）分离的方法，它实际上是一种隔离技术。防火墙是两个网络通信时实现的访问控制措施。它允许您“同意”人员和数据进入您的网络，同时从您的网络中排除您“不同意”的人员和数据，从而最大限度地防止黑客访问您的网络。换句话说，如果你不穿越防火墙，公司内部的人不能访问互联网，互联网上的人不能与公司内部的人通信。<br />
防火墙是什么？<br />
&nbsp; &nbsp; &nbsp; 与先前的Windows系统相比，XP系统增加了许多新的网络功能（Windows 7防火墙功能强大，因为它可以方便地定义和过滤数据包），如Internet连接防火墙（ICF），它使用“代码墙”将计算机与Internet分离，并检查所有数据包随时访问防火墙。包，决定拦截或释放这些数据包。防火墙可以是一种硬件、固件或软件。例如，专用防火墙设备是硬件形式的防火墙，包过滤路由器是嵌入有防火墙固件的路由器，代理服务器和其他软件是软件形式的防火墙。<br />
ICF工作原理<br />
&nbsp; &nbsp; &nbsp;ICF被认为是一个状态防火墙，它通过其路径监视所有通信，并检查每个被处理的消息的源地址和目的地地址。为了防止未经请求的通信连接公共端进入私有端，ICF保留ICF计算机的所有通信表。在单独的计算机中，ICF将跟踪来自该计算机的通信。当与ICS一起使用时，ICF将跟踪来自ICF/ICS计算机的所有通信和来自专用网络计算机的所有通信。所有上网的通信都与表中的项目进行比较。只有当表中有匹配项（这意味着通信交换在计算机或专用网络中开始）时，才能允许传入的因特网通信被传输到网络中的计算机。<br />
除非在Service选项卡上设置允许通信通过，否则来自外部ICF计算机（如因特网）的通信将被防火墙阻塞。ICF不会向您发送活动通知，但是会静态封锁未经请求的通信，并防止常见的黑客攻击，如端口扫描。<br />
防火墙类型<br />
&nbsp; &nbsp; &nbsp; 自诞生以来，防火墙经历了四个发展阶段：基于路由器的防火墙、定制的防火墙工具包、基于通用操作系统的防火墙、以及具有安全操作系统的防火墙。常见的防火墙是具有安全操作系统的防火墙，如NETEYE、NETSCREEN、TALENTIT等。<br />
在结构上，防火墙有两种：代理主机结构和路由器+过滤器结构。后者的结构如下：内部网络过滤路由器互联网。<br />
<p>
	&nbsp; &nbsp; &nbsp; &nbsp;原则上，防火墙可分为四类：专门设计的硬件防火墙、数据包过滤、电路级网关和应用级网关。具有高安全性能的防火墙系统由各种类型的防火墙组成，构成多个防火墙的“防御工事”。
</p>
<p>
	&nbsp; &nbsp; &nbsp; 选择防火墙就到<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">瑞博思特（北京）科技有限公司</a></strong>
</p>',
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			'title' => '工业交换机是什么',
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			'neirong' => '<p>
	<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>也称作工业以太网交换机，即应用于工业控制领域的以太网交换机设备，由于采用的网络标准，其开放性好、应用广泛以及价格低廉、使用的是透明而统一的TCP/IP协议，以太网已经成为工业控制领域的主要通信标准。
</p>
<p>
	<img src="/HT_flies/js/kindeditor/attached/image/20181203/20181203181013_98508.jpg" alt="" /> 
</p>
<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>具有电信级性能特征，可耐受严苛的工作环境。产品系列丰富，端口配置灵活，可满足各种工业领域的使用需求。产品采用宽温设计，防护等级不低于IP30，支持标准和私有的环网冗余协议。<br />
本身与商业网络在数据链路层、网络层、协议层等方面并无本质区别，但针对工业控制的实时性等需求，工业以太网解决了通信实时性、网络安全性、本质安全与安全防爆技术等技术问题，并且采用一些适合于工业环境的措施，如防水，抗振动...其核心还是和商用以太网没有本质的区别，这就和PC机与工控机之间的区别一样。
<div>
	工业交换机根据使用功能的不同有不同的分类：
</div>
<div>
	工业级PoE交换机
</div>
<div>
	工业级非PoE交换机
</div>
<div>
	光纤汇聚交换机
</div>
<p>
	管理型环网交换机
</p>
<p>
	选择交换机就选择<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>。
</p>
<br />',
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			'neirong' => '&nbsp; &nbsp; &nbsp; &nbsp;在<a href="http://www.r-best.cn/Chan/Index?ids=3" target="_blank">上海</a>怎样选择一台好的交换机是很多公司都在考虑的一个问题，一台好的交换机，在<a href="http://www.r-best.cn/Chan/Index?ids=3" target="_blank"><strong>上海</strong></a>一台好的交换机可以使用很多年，不仅为公司省时省力，还节省了经费，所以在选择<strong><a href="http://www.r-best.cn/Chan/Index?ids=3" target="_blank">上海交换机</a></strong>时，应该注意什么，就让小编来告诉你。<br />
1、1、注意合适的尺寸。现在的局域网建设除了功能实用外，局域网结构的布局合理也是大家所要考虑的问题。为此现在局域网常常使用控制柜，来对各种网络设备进行整体控制和统一管理。这样的话，我们选择的交换机在尺寸上，必须和控制柜相吻合。<br />
2、交换的速度要快。交换机传输速度的选择，要根据不同用户不同的通信要求来选择。<br />
3、端口数要够将来升级用。现在局域网对网络通信的要求越来越高，网络扩容的速度也是越来越快，因此我们最好在选购交换机时，要考虑到足够的扩展性，来选择适当的端口数目。<br />
4、管理控制功能要强大。由于网络交换机属于较为昂贵的设备，即使投资不能一次到位，也尽量做到三年内不落伍，这就要求我们在选择交换机时，也要把交换机的管理控制技术考虑在内。<br />
5、实时性。数据在传输的时候往往会具有一定的延时性，因此在选择产品的时候一定要把这个因素考虑在内，在标准的工厂自动化体系内，系统一般时间不要超过10ms。<br />
6、产品的可靠性。在工业环境中，可靠性至关重要，这些要考虑的因素一般有：硬件的耐受力、安装方式、冗余方式、故障诊断等。<br />
<strong>&nbsp; &nbsp; &nbsp;&nbsp;<a href="http://www.r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>是您不错的选择。<br />',
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			'zuozhe' => '上海思科|上海 Juniper|上海PaloAlto|上海无线租赁|上海思科工业交换机|上海Imperva|上海SD-WAN|上海BlackBerry|上海SolarWinds',
			'laiyuan' => '',
			'liandizhi' => '上海思科,上海 Juniper,上海PaloAlto,上海无线租赁,上海思科工业交换机,上海Imperva,上海SD-WAN,上海BlackBerry,上海SolarWinds',
			'pic' => '',
			'neirong' => '上海思科,上海 Juniper,上海PaloAlto,上海无线租赁,上海思科工业交换机,上海Imperva,上海SD-WAN,上海BlackBerry,上海SolarWinds,瑞博思特',
			'addtime' => '2018-08-04 00:00:00'
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include - APP/View/IE/chan_l.ctp, line 9
View::_evaluate() - CORE/Cake/View/View.php, line 947
View::_render() - CORE/Cake/View/View.php, line 909
View::render() - CORE/Cake/View/View.php, line 471
Controller::render() - CORE/Cake/Controller/Controller.php, line 948
ChanController::Index() - APP/Controller/ChanController.php, line 79
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 486
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 187
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 162
[main] - APP/webroot/index.php, line 110

Warning (2): Invalid argument supplied for foreach() [APP/View/IE/chan_l.ctp, line 9]
Code Context
        <div class="z_rbst_gsjj_dei_de">
            <ul>
                <?php foreach ($dhList as $i => $v): ?>
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			'ids' => '215',
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			'idsss' => '2',
			'title' => '交换机和路由器的区别是什么？',
			'zuozhe' => '',
			'laiyuan' => '',
			'addtime' => '2018-12-27 14:59:23',
			'neirong' => '<p>
	&nbsp; &nbsp; &nbsp; 交换机和路由器的区别在哪里?我相信很多人都在疑惑这个问题，那么接下来就就告诉你<span>上<strong><a href="http://r-best.cn/Chan/Show?id=180" target="_blank">海思科工业交换机</a></strong>和路由器的区别。</span>
</p>
<p>
	交换机是一种基于MAC（网卡硬件地址）标识的网络设备，能够完成数据包的封装和转发功能。交换机可以“学习”MAC地址并将它们存储在内部地址表中。通过在数据帧的发起者和目标接收器之间建立临时交换路径，数据帧可以直接从源地址到达目的地地址。<span><strong><a href="http://r-best.cn/Chan/Show?id=180" target="_blank">上海思科工业交换机</a></strong>是你的不二之选。</span>
</p>
<p style="text-align:center;">
	<span><img src="/HT_flies/js/kindeditor/attached/image/20181227/20181227150700_87670.jpg" alt="" /><br />
</span>
</p>
路由器相当于邮局将不同的信件分发到不同的地方。<br />
网络路由是从不同的网站向不同的网站发送数据。ADSL的主要应用有：<br />
对Internet外部网络的访问请求由LAN网络发起。然后Internet网络上相应的主机响应。然后发送回数据。发送给广告公司后。如果你不去，你就不能进入局域网。但是ADSL路由可以记住LAN中的哪个主机刚刚发出请求，因此它将数据从Internet转发到LAN中的相应计算机，从而实现许多计算机一起连接到Internet。<br />
<p>
	目前，ADSL路由器都是由一个ADSL驱动多台计算机接入互联网和qq，并等待网络应用。
</p>
<p>
	选择好的交换机就选<strong><a href="http://r-best.cn/Chan/Show?id=180" target="_blank">上海思科工业交换机</a></strong>。
</p>',
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		'contents_infos' => array(
			'ids' => '214',
			'idss' => '18',
			'idsss' => '2',
			'title' => '选择交换机选择思科',
			'zuozhe' => '',
			'laiyuan' => '',
			'addtime' => '2018-12-19 16:17:43',
			'neirong' => '<p>
	你知道什么是交换机么？交换机可以做什么？<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>来为你讲述：工业交换机，也称作工业以太网交换机，即应用于工业控制领域的以太网交换机设备，由于采用的网络标准，其开放性好、应用广泛以及价格低廉、使用的是透明而统一的TCP/IP协议，以太网已经成为工业控制领域的主要通信标准。
</p>
<p style="text-align:center;">
	<img src="/HT_flies/js/kindeditor/attached/image/20181219/20181219162125_71762.jpg" alt="" /> 
</p>
工业交换机具有电信级性能特征，可耐受严苛的工作环境。产品系列丰富，端口配置灵活，可满足各种工业领域的使用需求。产品采用宽温设计，防护等级不低于IP30，支持标准和私有的环网冗余协议。<br />
<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>作用有哪些？<br />
工 业以太网交换机主要是应用于复杂的工业环境中的实时以太网数据传输。以太网在设计时，由于其采用载波侦听多路复用冲突检测（CSMA/CD机制），在复杂的工业环境中应用，其可靠性大大降低，从而导致以太网不能使用。工业以太网交换机采用存储转换交换方式，同时提高以太网通信速度，并且内置智能报警设计监控网络运行状况，使得在恶劣危险的工业环境中保证以太网可靠稳定的运行。<br />
<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>也称作工业以太网交换机，即应用于工业控制领域的以太网交换机设备，由于采用的网络标准，其开放性好、应用广泛以及价格低廉、使用的是透明而统一的TCP/IP协议，以太网已经成为工业控制领域的主要通信标准。<br />
<p>
	工业交换机具有电信级性能特征，可耐受严苛的工作环境。产品系列丰富，端口配置灵活，可满足各种工业领域的使用需求。产品采用宽温设计，防护等级不低于IP30，支持标准和私有的环网冗余协议。
</p>
<p>
	选择<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>就选瑞博思特。
</p>',
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		'contents_infos' => array(
			'ids' => '213',
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			'title' => '思科工业交换机选择',
			'zuozhe' => '',
			'laiyuan' => '',
			'addtime' => '2018-12-12 14:47:42',
			'neirong' => '<p>
	&nbsp; &nbsp; &nbsp; &nbsp;你知道什么是工业交换机么？瑞博思特（北京）科技有限公司为你讲述什么是<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科</a></strong>工业交换机
</p>
<p>
	&nbsp; &nbsp; &nbsp; <span><strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科</a></strong>工业交换机</span>通过弹性、易于部署的交换机支撑物联网的扩展
</p>
<p style="text-align:center;">
	<img src="/HT_flies/js/kindeditor/attached/image/20181212/20181212145337_33576.jpg" alt="" />
</p>
&nbsp; &nbsp; &nbsp; 一家制造业企业通过提高工厂和 IT 基础架构的灵活程度和集成水平，把交付订单的时间缩短了25%。一家交通运输企业在轨道和机车系统上部署了大量传感器，一旦轨道信号系统出现故障，系统就会在故障引发严重事故前发出警报。还有一家电力公司，其定位故障位置的速度和恢复服务的速度都比之前提高了20%。<br />
&nbsp; &nbsp; &nbsp; 将上海思科工业级以太网（IE）交换机作为集成的、融合信息技术（IT）和操作技术（OT）网络的一部分来部署，企业就有可能获得上述成就。在物联网（IoT）时代，随着终端设备和传感器的数量不断增多，企业网络也在急剧扩展，思科工业级以太网交换机会帮助企业抓住新的机遇，获得更高的效率。<br />
&nbsp; &nbsp; &nbsp; 据 IDC 的一项调查表明，“截至2013年底，已有91亿台 IoT 设备完成了安装部署，预计到2020年，这一数字将以17.5%的年复合增长率增长至281亿台。1”<br />
&nbsp; &nbsp; &nbsp; 加固型思科 IE 交换机构成了一系列广泛的技术工业应用和流程的网络基础架构基础，比如：工厂自动化智能型交通运输系统变电站自动化采矿作业<br />
油气冶炼和输送系统各种监测和远程监控功能<br />
<p>
	&nbsp; &nbsp; &nbsp; <strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科</a></strong>IE交换机集可靠性与高可用性技术于一体，不仅能帮助企业快速扩展不断增加的网络端点和应用，与此同时，还能保证整张网络的弹性。思科推出的网络即传感器（network- as-a-sensor）方案将网络安全的概念整合进整个网络，不仅在最大程度上确保了网络安全可视性和可控性，针对网络流量提供有价值的分析洞察，还能对网络内的所有活动进行持续监控。
</p>
<p>
	选择<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科</a></strong>工业交换机就来瑞博思特
</p>',
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			'title' => '防火墙的选择至关重要',
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	&nbsp; &nbsp; &nbsp; 防火墙是什么？它有什么作用呢？这些你都知道么？<strong><a href="http://http://r-best.cn/Chan/Index?ids=3" target="_blank">瑞博思特（北京）科技有限公司</a></strong>为您讲解，专业防火墙知识。
</p>
<p>
	&nbsp; &nbsp; &nbsp;<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank"> 瑞博思特（北京）科技有限公司</a></strong>告诉您所谓防火墙是指在内部和外部网络、专用网络和公共网络之间的边界上构建的软硬件设备组成的保护屏障。它是一种图像的安全方法。它是计算机硬件和软件的结合，使Internet和Intranet融为一体。安全网关保护内部网免受非法用户的攻击。防火墙由四个部分组成：服务访问规则、身份验证工具、包过滤和应用网关。防火墙是计算机和它连接的网络之间的软件或硬件。流入和流出计算机的所有网络通信和数据包都通过防火墙。
</p>
<p>
	<img src="/HT_flies/js/kindeditor/attached/image/20181210/20181210142811_68194.jpg" alt="" />
</p>
&nbsp; &nbsp; &nbsp; 在网络中，所谓的“防火墙”指的是一种将内部网与公共接入网（如因特网）分离的方法，它实际上是一种隔离技术。防火墙是两个网络通信时实现的访问控制措施。它允许您“同意”人员和数据进入您的网络，同时从您的网络中排除您“不同意”的人员和数据，从而最大限度地防止黑客访问您的网络。换句话说，如果你不穿越防火墙，公司内部的人不能访问互联网，互联网上的人不能与公司内部的人通信。<br />
防火墙是什么？<br />
&nbsp; &nbsp; &nbsp; 与先前的Windows系统相比，XP系统增加了许多新的网络功能（Windows 7防火墙功能强大，因为它可以方便地定义和过滤数据包），如Internet连接防火墙（ICF），它使用“代码墙”将计算机与Internet分离，并检查所有数据包随时访问防火墙。包，决定拦截或释放这些数据包。防火墙可以是一种硬件、固件或软件。例如，专用防火墙设备是硬件形式的防火墙，包过滤路由器是嵌入有防火墙固件的路由器，代理服务器和其他软件是软件形式的防火墙。<br />
ICF工作原理<br />
&nbsp; &nbsp; &nbsp;ICF被认为是一个状态防火墙，它通过其路径监视所有通信，并检查每个被处理的消息的源地址和目的地地址。为了防止未经请求的通信连接公共端进入私有端，ICF保留ICF计算机的所有通信表。在单独的计算机中，ICF将跟踪来自该计算机的通信。当与ICS一起使用时，ICF将跟踪来自ICF/ICS计算机的所有通信和来自专用网络计算机的所有通信。所有上网的通信都与表中的项目进行比较。只有当表中有匹配项（这意味着通信交换在计算机或专用网络中开始）时，才能允许传入的因特网通信被传输到网络中的计算机。<br />
除非在Service选项卡上设置允许通信通过，否则来自外部ICF计算机（如因特网）的通信将被防火墙阻塞。ICF不会向您发送活动通知，但是会静态封锁未经请求的通信，并防止常见的黑客攻击，如端口扫描。<br />
防火墙类型<br />
&nbsp; &nbsp; &nbsp; 自诞生以来，防火墙经历了四个发展阶段：基于路由器的防火墙、定制的防火墙工具包、基于通用操作系统的防火墙、以及具有安全操作系统的防火墙。常见的防火墙是具有安全操作系统的防火墙，如NETEYE、NETSCREEN、TALENTIT等。<br />
在结构上，防火墙有两种：代理主机结构和路由器+过滤器结构。后者的结构如下：内部网络过滤路由器互联网。<br />
<p>
	&nbsp; &nbsp; &nbsp; &nbsp;原则上，防火墙可分为四类：专门设计的硬件防火墙、数据包过滤、电路级网关和应用级网关。具有高安全性能的防火墙系统由各种类型的防火墙组成，构成多个防火墙的“防御工事”。
</p>
<p>
	&nbsp; &nbsp; &nbsp; 选择防火墙就到<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">瑞博思特（北京）科技有限公司</a></strong>
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			'title' => '工业交换机是什么',
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	<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>也称作工业以太网交换机，即应用于工业控制领域的以太网交换机设备，由于采用的网络标准，其开放性好、应用广泛以及价格低廉、使用的是透明而统一的TCP/IP协议，以太网已经成为工业控制领域的主要通信标准。
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<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>具有电信级性能特征，可耐受严苛的工作环境。产品系列丰富，端口配置灵活，可满足各种工业领域的使用需求。产品采用宽温设计，防护等级不低于IP30，支持标准和私有的环网冗余协议。<br />
本身与商业网络在数据链路层、网络层、协议层等方面并无本质区别，但针对工业控制的实时性等需求，工业以太网解决了通信实时性、网络安全性、本质安全与安全防爆技术等技术问题，并且采用一些适合于工业环境的措施，如防水，抗振动...其核心还是和商用以太网没有本质的区别，这就和PC机与工控机之间的区别一样。
<div>
	工业交换机根据使用功能的不同有不同的分类：
</div>
<div>
	工业级PoE交换机
</div>
<div>
	工业级非PoE交换机
</div>
<div>
	光纤汇聚交换机
</div>
<p>
	管理型环网交换机
</p>
<p>
	选择交换机就选择<strong><a href="http://r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>。
</p>
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			'neirong' => '&nbsp; &nbsp; &nbsp; &nbsp;在<a href="http://www.r-best.cn/Chan/Index?ids=3" target="_blank">上海</a>怎样选择一台好的交换机是很多公司都在考虑的一个问题，一台好的交换机，在<a href="http://www.r-best.cn/Chan/Index?ids=3" target="_blank"><strong>上海</strong></a>一台好的交换机可以使用很多年，不仅为公司省时省力，还节省了经费，所以在选择<strong><a href="http://www.r-best.cn/Chan/Index?ids=3" target="_blank">上海交换机</a></strong>时，应该注意什么，就让小编来告诉你。<br />
1、1、注意合适的尺寸。现在的局域网建设除了功能实用外，局域网结构的布局合理也是大家所要考虑的问题。为此现在局域网常常使用控制柜，来对各种网络设备进行整体控制和统一管理。这样的话，我们选择的交换机在尺寸上，必须和控制柜相吻合。<br />
2、交换的速度要快。交换机传输速度的选择，要根据不同用户不同的通信要求来选择。<br />
3、端口数要够将来升级用。现在局域网对网络通信的要求越来越高，网络扩容的速度也是越来越快，因此我们最好在选购交换机时，要考虑到足够的扩展性，来选择适当的端口数目。<br />
4、管理控制功能要强大。由于网络交换机属于较为昂贵的设备，即使投资不能一次到位，也尽量做到三年内不落伍，这就要求我们在选择交换机时，也要把交换机的管理控制技术考虑在内。<br />
5、实时性。数据在传输的时候往往会具有一定的延时性，因此在选择产品的时候一定要把这个因素考虑在内，在标准的工厂自动化体系内，系统一般时间不要超过10ms。<br />
6、产品的可靠性。在工业环境中，可靠性至关重要，这些要考虑的因素一般有：硬件的耐受力、安装方式、冗余方式、故障诊断等。<br />
<strong>&nbsp; &nbsp; &nbsp;&nbsp;<a href="http://www.r-best.cn/Chan/Index?ids=3" target="_blank">上海思科工业交换机</a></strong>是您不错的选择。<br />',
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		'dhclass_infos' => array(
			'ids' => '37',
			'idss' => '4',
			'dhclass' => 'CISCO解决方案',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '解决方案'
		)
	)
)
$CanPLm = array(
	(int) 0 => array(
		'dhclass_infos' => array(
			'ids' => '7',
			'idss' => '3',
			'dhclass' => 'CISCO',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	),
	(int) 1 => array(
		'dhclass_infos' => array(
			'ids' => '8',
			'idss' => '3',
			'dhclass' => 'Juniper',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	),
	(int) 2 => array(
		'dhclass_infos' => array(
			'ids' => '21',
			'idss' => '3',
			'dhclass' => 'Palo Alto',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	),
	(int) 3 => array(
		'dhclass_infos' => array(
			'ids' => '22',
			'idss' => '3',
			'dhclass' => 'SolarWinds',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	),
	(int) 4 => array(
		'dhclass_infos' => array(
			'ids' => '23',
			'idss' => '3',
			'dhclass' => ' Imperva',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	),
	(int) 5 => array(
		'dhclass_infos' => array(
			'ids' => '24',
			'idss' => '3',
			'dhclass' => 'ForeScout',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	),
	(int) 6 => array(
		'dhclass_infos' => array(
			'ids' => '25',
			'idss' => '3',
			'dhclass' => 'BlackBerry',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	),
	(int) 7 => array(
		'dhclass_infos' => array(
			'ids' => '26',
			'idss' => '3',
			'dhclass' => 'SmartX超融合',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	),
	(int) 8 => array(
		'dhclass_infos' => array(
			'ids' => '35',
			'idss' => '3',
			'dhclass' => 'Silver Peak',
			'ym' => '',
			'pic' => '',
			'xid' => '99999',
			'shenhe' => '
'
		),
		'dh_infos' => array(
			'dh' => '产品中心'
		)
	)
)
$SeoInfo = array(
	(int) 0 => array(
		'nry_infos' => array(
			'ids' => '6',
			'idss' => '100',
			'idsss' => '100',
			'title' => '瑞博思特',
			'zuozhe' => '上海思科|上海 Juniper|上海PaloAlto|上海无线租赁|上海思科工业交换机|上海Imperva|上海SD-WAN|上海BlackBerry|上海SolarWinds',
			'laiyuan' => '',
			'liandizhi' => '上海思科,上海 Juniper,上海PaloAlto,上海无线租赁,上海思科工业交换机,上海Imperva,上海SD-WAN,上海BlackBerry,上海SolarWinds',
			'pic' => '',
			'neirong' => '上海思科,上海 Juniper,上海PaloAlto,上海无线租赁,上海思科工业交换机,上海Imperva,上海SD-WAN,上海BlackBerry,上海SolarWinds,瑞博思特',
			'addtime' => '2018-08-04 00:00:00'
		)
	)
)
include - APP/View/IE/chan_l.ctp, line 9
View::_evaluate() - CORE/Cake/View/View.php, line 947
View::_render() - CORE/Cake/View/View.php, line 909
View::render() - CORE/Cake/View/View.php, line 471
Controller::render() - CORE/Cake/Controller/Controller.php, line 948
ChanController::Index() - APP/Controller/ChanController.php, line 79
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 486
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 187
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 162
[main] - APP/webroot/index.php, line 110