57C400-1 控制模块

易卖工控网（www.ymgk.com）提供”57C400-1 控制模块”，产品详情：品牌/厂家：其他品牌、型号：57C400-1、成色：全新、货期：期货 7天内发货、保修：365天，更多产品详情就上易卖工控网。

目前以太网接入方式主要有3种：固定IP，DHCP，PPPOE，而PPPOE+VLAN是一种比较理想的宽带接入方式。

            　　1、宽带接入网需要实现的基本功能

            　　宽带接入网需要实现的基本功能可以归纳为以下几个方面：
            


            　　(1)用户管理

            　　掌握用户的信息，在用户进行通信时对用户进行认证、授权，使合法用户方便快捷地接入网中，杜绝非法用户接入，防止非法用户占用网络资源。

            　　(2)安全管理

            　　合法用户在通信时要保障其数据的安全性，隔离带有用户个人信息的数据包，对于主要的网络设备防止其受到攻击而造成网络瘫痪。由于用户终端是以普通网卡与网络设备相连，在通信时会发送一些广播地址的帧(如ARP，DHCP消息等)，而这些消息会携带用户的个人信息(如用户的MAC地址)，如不隔离这些消息让其他用户接收到，容易发生MAC/IP地址的仿冒，影响合法用户上网。对于运营商来说，保护其系统设备的安全性，防止恶意攻击是十分重要的。

BENTLY NEVADA    2700010105
BENTLY NEVADA    27000401
BENTLY NEVADA    2700050100
BENTLY NEVADA    27490012000
BENTLY NEVADA    277A2909P004
BENTLY NEVADA    2789-120
BENTLY NEVADA    2789-132
BENTLY NEVADA    2789-144
BENTLY NEVADA    2789216
BENTLY NEVADA    2840800153602
BENTLY NEVADA    2840800383602
BENTLY NEVADA    300-00-00-08-12-02
BENTLY NEVADA    30000-00-08-18-02
BENTLY NEVADA    30001-00-20-18-02
BENTLY NEVADA    3000100203602
BENTLY NEVADA    30004-02-12-18-02
BENTLY NEVADA    3100000000029003
BENTLY NEVADA    3100016100004701
BENTLY NEVADA    3100027053502106
BENTLY NEVADA    3100028100005903
BENTLY NEVADA    3300/01
BENTLY NEVADA    3300/01-01
BENTLY NEVADA    3300/01-01-00
BENTLY NEVADA    3300/03-01-00
BENTLY NEVADA    3300/03-01-01
BENTLY NEVADA    3300/03-02-00
BENTLY NEVADA    3300/03-03-00
BENTLY NEVADA    3300/0368049-00
BENTLY NEVADA    3300/03-A01-B00
BENTLY NEVADA    3300/05-22-00-00
BENTLY NEVADA    3300/05-23-01-00
BENTLY NEVADA    3300/05-24-00-00
BENTLY NEVADA    3300/05-26-00-00
BENTLY NEVADA    3300/05-A25-B00-C00
BENTLY NEVADA    3300/06-02-00-00-02
BENTLY NEVADA    3300/10-01-02-00
BENTLY NEVADA    3300/10-01-02-01
BENTLY NEVADA    3300/12-01-20-00
BENTLY NEVADA    3300/12-02-20-00
BENTLY NEVADA    3300/12-A01-B20-C00
BENTLY NEVADA    3300/14-01-20-00
BENTLY NEVADA    3300/14-01-20-01
BENTLY NEVADA    3300/14-02-20-00
BENTLY NEVADA    3300/15-01-01-03-00-00-00
BENTLY NEVADA    3300/15-02-01-00-01-00-00
BENTLY NEVADA    3300/15-02-01-02-00-00
BENTLY NEVADA    3300/15-03-01-01-00-00-00
BENTLY NEVADA    3300/16-02-01-00-01-01-01
BENTLY NEVADA    3300/16-02-01-02-00-00-00
BENTLY NEVADA    3300/16-02-02
BENTLY NEVADA    3300/16-03-01-01-00-00-00
BENTLY NEVADA    3300/16-11-01-00-01-00
BENTLY NEVADA    3300/16-11-01-01-00-00-02
BENTLY NEVADA    3300/16-13-01-01-00-00-00
BENTLY NEVADA    3300/16-14-01-01-00-00-00
BENTLY NEVADA    3300/20-01-01-00-00-00
BENTLY NEVADA    3300/20-01-01-01-00-00
BENTLY NEVADA    3300/20-01-01-02-00-00
BENTLY NEVADA    3300/20-02-01-01-00-00
BENTLY NEVADA    3300/20-02-01-02-00-00
BENTLY NEVADA    3300/20-03-01-00-00-00
BENTLY NEVADA    3300/20-12-01-01-00-00
BENTLY NEVADA    3300/20-12-01-01-00-02
BENTLY NEVADA    3300/20-12-01-02-00-00
BENTLY NEVADA    3300/20-12-01-02-00-01
BENTLY NEVADA    3300/25-05-03-05-00-00-001-00
BENTLY NEVADA    3300/25-05-03-05-00-00-02-00
BENTLY NEVADA    3300/35
BENTLY NEVADA    3300/35-02-01-02-00-00
BENTLY NEVADA    3300/35-02-02-01-00-00
BENTLY NEVADA    3300/35-02-02-02-00-00
BENTLY NEVADA    3300/35-03-02-01-00-00
BENTLY NEVADA    3300/35-05-02-01-00-00
BENTLY NEVADA    3300/50-02-01-00-00
BENTLY NEVADA    3300/55-01-04-02-02-00-00-05-00
BENTLY NEVADA    3300/55-01-04-03-03-00
BENTLY NEVADA    3300/95-03-13-05-01-01-03-83-02-01-00-01-00
BENTLY NEVADA    330003
BENTLY NEVADA    3300030102
BENTLY NEVADA    3300050101010001
BENTLY NEVADA    330005220001
BENTLY NEVADA    330005220201
BENTLY NEVADA    33000602000012
BENTLY NEVADA    330012012001
BENTLY NEVADA    330012012200
BENTLY NEVADA    330012022001
BENTLY NEVADA    330012022002
BENTLY NEVADA    3300151301000000
BENTLY NEVADA    3300151301010000
BENTLY NEVADA    330016
BENTLY NEVADA    3300160101020000
BENTLY NEVADA    3300160102000000
BENTLY NEVADA    3300160102010100
BENTLY NEVADA    3300160201020200
BENTLY NEVADA    3300160201030100
BENTLY NEVADA    3300160205000000
BENTLY NEVADA    3300160401000001
BENTLY NEVADA    3300160401010100
BENTLY NEVADA    3300161101010002
BENTLY NEVADA    3300161101020001
BENTLY NEVADA    3300161201010000
BENTLY NEVADA    3300161201010001
BENTLY NEVADA    3300161201020002