子网193.1.1.96 有效IP从193.1.1.97到193.1.1.126 子网193.1.1.128有效IP从193.1.1.129到193.1.1.158 子网193.1.1.160 有效IP从193.1.1.161到193.1.1.190 子网193.1.1.192 有效IP从193.1.1.193到193.1.1.222 例2:网络131.1070.0,子网掩码是255.255.2240。问:这个子网可划分几个子网,每个子网的主机 ID范围是什么? 解析 子网131.107.32.0 有效IP从131.10732.1到131.107.63.254 子网131.107.64.0 有效IP从131.107.64.1到131.107.95.254 子网131.107.96.0 有效IP从131.107.96.1到131.107.127.254 子网131.107.128.0 有效IP从131.107.128.1到131.107.159.254 子网131.107.160.0有效IP从131.107.160.1到131.107.191.254 子网131.107.192.0有效IP从131.107.192.1到131.107.223.254 B 3: Your company has been assigned one class C network Id by your local ISP In your Windows NT TCP/IP network, you plan to divide the network into multiple subnets. Each subnet will have as many as 15 host IDs If you want to allow the largest number of the subnets, which subnet mask should you use? A.255.255.255.192 B.255.255.255.224 C.255.255.255.240 D.255.255.255.248 答案:B 1 4: Your company has been assigned one class B network ID by your local ISP In your Windows NT TCP/IP network, you plan to divide the network into multiple subnets. Each subnet will have as many as 1000 host IDs. If you want to allow the largest number of the subnets, which subnet mask should you use? A.255.255.224.0 B.255.255.240.0 C.255.255.248.0 D.255.255.252.0 答案:D ◇超网( Suppernetting) 超网是一个子网,是借用网络ID充当主机ID的解决方法。由超网构成的地址被称为“无类地址” 是用来解决“路由爆炸”问题。|详见附录 超网技术可以帮助我们避免浪费地址、从C类子网中产生大型网络 如果有足够的C类地址,你也可以产生A类超网 Suppernetting的技术被称为 Classless Inter- Domain routing(CIDR,无类域间路由) 在实超网时,路由器一定支持这种技术才可实现 B 1: Your company has been assigned five class C network address: 220. 78.170.0, 220.78.171.0 220.78.172.0, 220.78.173.0, 220.78.174.0. In order to prevent overwhelming the Internet router, you want to collapse the five entries to a single entry in the routing table. Which subnet mask should you use to accomplish this A.255.255.240.0 B.255.255.248.0 C.255.255252.0 D.255.255.254.0 北京瑞通北大培训中心 第13页共32页北京瑞通北大培训中心 第 13 页 共 32 页 子网 193. 1. 1. 96 有效 IP 从 193. 1. 1. 97 到 193. 1. 1. 126 子网 193. 1. 1. 128 有效 IP 从 193. 1. 1. 129 到 193. 1. 1. 158 子网 193. 1. 1. 160 有效 IP 从 193. 1. 1. 161 到 193. 1. 1. 190 子网 193. 1. 1. 192 有效 IP 从 193. 1. 1. 193 到 193. 1. 1. 222 例 2：网络 131.107.0.0，子网掩码是 255. 255. 224. 0。问：这个子网可划分几个子网，每个子网的主机 ID 范围是什么？ 解析： 子网 131.107. 32. 0 有效 IP 从 131.107. 32. 1 到 131.107. 63. 254 子网 131.107. 64. 0 有效 IP 从 131.107. 64. 1 到 131.107. 95. 254 子网 131.107. 96. 0 有效 IP 从 131.107. 96. 1 到 131.107. 127. 254 子网 131.107. 128. 0 有效 IP 从 131.107. 128. 1 到 131.107. 159. 254 子网 131.107. 160. 0 有效 IP 从 131.107. 160. 1 到 131.107. 191. 254 子网 131.107. 192. 0 有效 IP 从 131.107. 192. 1 到 131.107. 223. 254 例 3：Your company has been assigned one class C network ID by your local ISP.In your Windows NT TCP/IP network, you plan to divide the network into multiple subnets. Each subnet will have as many as 15 host IDs. If you want to allow the largest number of the subnets, which subnet mask should you use? A. 255.255.255.192 B. 255.255.255.224 C. 255.255.255.240 D. 255.255.255.248 答案：B 例 4：Your company has been assigned one class B network ID by your local ISP.In your Windows NT TCP/IP network, you plan to divide the network into multiple subnets. Each subnet will have as many as 1000 host IDs. If you want to allow the largest number of the subnets, which subnet mask should you use? A. 255.255. 224. 0 B. 255.255. 240. 0 C. 255.255. 248. 0 D. 255.255.252. 0 答案： D ◇超网(Suppernetting) 超网是一个子网，是借用网络 ID 充当主机 ID 的解决方法。由超网构成的地址被称为“无类地址”。 是用来解决“路由爆炸”问题。[详见附录] 超网技术可以帮助我们避免浪费地址、从 C 类子网中产生大型网络。 如果有足够的 C 类地址，你也可以产生 A 类超网。 Suppernetting 的技术被称为 Classless Inter-Domain Routing(CIDR，无类域间路由) 在实超网时，路由器一定支持这种技术才可实现。 例 1：Your company has been assigned five class C network address：220.78.170.0，220.78.171.0， 220.78.172.0，220.78.173.0，220.78.174.0. In order to prevent overwhelming the Internet router, you want to collapse the five entries to a single entry in the routing table. Which subnet mask should you use to accomplish this. A．255.255.240.0 B．255.255.248.0 C．255.255.252.0 D．255.255.254.0