阳台配线间线槽上上

图5-4二楼水平子系统信息点分布图

光纤盒三层交换机三层交换机48口二层交换机48口二层交换机48口二层交换机48口二层交换机48口二层交换机48口二层交换机48口二层交换机每个二层交换机是48口，整栋楼的信息点是336个，刚好使用七个48口交换机适可，但是要预留一个交换机，每个信息点使用永久链路连接到二层交换机，接口满了为止.

图5-5 设备间设备的连接方式

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6. 各宿舍的IP分配

女生宿舍共有8层，每层有42个信息点。如果将每层楼分为一个子网，即共需要8个子网。

划分IP的思路如下：

已知：现有IP网络：172.168.0.0 255.255.0.0。 要求：需划分8个子网；每个子网最少需42个IP。 算法：设从原来的主机位中取n个位用来表示子网，则有： 2n-2>=8 2(16-n) -2>=42 4<=n<=10 n=4

子网掩码是：255.255.240.0

表6-1 楼层子网地址/广播地址/可用的IP范围表

楼层 各楼层的子网地址 各楼层的广播地址 各楼层可用的IP范围 一楼 172.168.16.0 二楼 172.168.32.0 三楼 172.168.48.0 四楼 172.168.64.0 五楼 172.168.80.0 六楼 172.168.96.0 七楼 172.168.112.0 八楼 172.168.128.0

表6-2各宿舍IP地址

172.168.31.255 172.168.47. 255 172.168.63. 255 172.168.79. 255 172.168.95. 255 172.168.16.1-172.168.31.254 172.168.32.1-172.168.47.254 172.168.48.1-172.168.63.254 172.168.64.1-172.168.79.254 172.168.80.1-172.168.95.254 172.168.111. 255 172.168.96.1-172.168.111.254 172.168.127. 255 172.168.112.1-172.168.127.254 172.168.143. 255 172.168.128.1-172.168.143.254 楼层 一 楼 宿舍号 101 102 103 IP分配 172.168.16.1~172.168.16.6 172.168.16.7~172.168.16.10 172.168.16.11~172.168.16.14 19

104 105 106 107 108 109 201 202 203 204 二 楼 205 206 207 208 209 301 302 303 304 三 楼 305 306 307 308 309 401 402 四 楼 403 404 405 172.168.16.15~172.168.16.18 172.168.16.19~172.168.16.24 172.168.16. 25~172.168.16.28 172.168.16.29~172.168.16.32 172.168.16.33~172.168.16.36 172.168.16.37~172.168.16.42 172.168.32.1~172.168.32.6 172.168.32.7~172.168.32.10 172.168.32.11~172.168.32.14 172.168.32.15~172.168.32.18 172.168.32. 19~172.168.32.22 172.168.32.23~172.168.32.26 172.168.32.27~172.168.32.30 172.168.32.31~172.168.32.34 172.168.48.1~172.168.48.6 172.168.48.7~172.168.48.10 172.168.48.11~172.168.48.14 172.168.48.15~172.168.48.18 172.168.48.19~172.168.48.24 172.168.48. 25~172.168.48.28 172.168.48.29~172.168.48.32 172.168.48.33~172.168.48.36 172.168.48.37~172.168.48.42 172.168.64.1~172.168.64.6 172.168.64.7~172.168.64.10 172.168.64.11~172.168.64.14 172.168.64.15~172.168.64.18 172.168.64.19~172.168.64.24 20

406 407 408 409 501 502 503 504 五 楼 505 506 507 508 509 601 602 603 604 六 楼 605 606 607 608 609 701 702 703 七 楼 704 705 706 707 172.168.64. 25~172.168.64.28 172.168.64.29~172.168.64.32 172.168.64.33~172.168.64.36 172.168.64.37~172.168.64.42 172.168.80.1~172.168.80.6 172.168.80.7~172.168.80.10 172.168.80.11~172.168.80.14 172.168.80.15~172.168.80.18 172.168.80.19~172.168.80.24 172.168.80. 25~172.168.80.28 172.168.80.29~172.168.80.32 172.168.80.33~172.168.80.36 172.168.80.37~172.168.80.42 172.168.96.1~172.168.96.6 172.168.96.7~172.168.96.10 172.168.96.11~172.168.96.14 172.168.96.15~172.168.96.18 172.168.96.19~172.168.96.24 172.168.96. 25~172.168.96.28 172.168.96.29~172.168.96.32 172.168.96.33~172.168.96.36 172.168.96.37~172.168.96.42 172.168.112.1~172.168.112.6 172.168.112.7~172.168.112.10 172.168.112.11~172.168.112.14 172.168.112.15~172.168.112.18 172.168.112.19~172.168.112.24 172.168.112. 25~172.168.112.28 172.168.112.29~172.168.112.32 21