问题CCNA

cwav

嗯？好像是基于组播地址的阿

cmsc

呵呵。。。我对比了一下基于Multicast和Policy的说法，两种差不多，其实你说的那个基于Multicast应该是基于SuperVlan的，转贴一个关于它的解释：<br>Ｓｕｐｅｒ ＶＬＡＮ划分法是目前最先进的一种ＶＬＡＮ划分方法，Ｓｕｐｅｒ ＶＬＡＮ又称为ＶＬＡＮ聚合（ＶＬＡＮ Ａｇｇｒｅｇａｔｉｏｎ），是一种专门设计的优化ＩＰ地址的管理技术。其原理是每个子网（ｓｕｂ－ＶＬＡＮ）都是独立的多播通道，多播信息不能在不同的子网中进行交换。当数据需要送到多个目的节点时，就动态建立ＶＬＡＮ代理，通过代理设备对ＶＬＡＮ中的用户进行管理。这样每个子网不需要设定ＩＰ地址，而是一个Ｓｕｐｅｒ ＶＬＡＮ中的所有子网共享一个ＩＰ地址，这个ＩＰ地址就是Ｓｕｐｅｒ ＶＬＡＮ的ＩＰ地址。<br>

cwav

呵呵，是这样的：）那你的policy呢？

cmsc

基于策略的VLAN<br><br>基于策略的VLAN的划分是一种比较有效而直接的方式。这主要取决于在VLAN的划分中所采用的策略。<br><br>我们一般提到的是前三种说法，这也是统一的说法；至于是multicast or policy就没有那么统一（国家网设教材也是用policy）。

cwav

只有一个IP　address　 要做NAT 也要做内网WEB服务器 怎么来实现？？<br><br>传说中是无法实现的：）

cwav

oh，no，你是说只做内网web服务器？那是可以实现的：）

cwav

原文由 [B]寒雪[/B] 发表:<br>QUESTION NO: 84<br>Which statements is true regarding the command sequence shown below? (Choose three)<br>RouterA(config)# interface loopback 0<br>RouterA(config-if)# ip address 192.168.31.33 255.255.255.255<br>A. It creates a virtual, software only, interface.<br>B. It uses a wildcard mask of 255.255.255.255.<br>C. It ensures that an interface is always active for OSPF processes.<br>D. It provides a way to test the convergence of OSPF routing updates.<br>E. The mask of 255.255.255.255 is called a host mask.<br>F. These commands can only be issued to configure serial interfaces.<br>Answer: A, B, D<br><br>

<br><br>ADE

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QUESTION NO: 36<br>You are a network technician at TestKing. You have told a newly appointed trainee that the OSI model<br>has 7 layers and that the Application layer is the highest layer. The trainee is curious as to which<br>protocols operate at the application layer.<br>What should you tell him? (Choose all that apply.)<br>A. TCP<br>B. Telnet<br>C. FTP<br>D. SNMP<br>E. IP<br>Answer: B C（D怎么不选择应该选择B,C,D）<br><br>SNMP也是应用层协议

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QUESTION NO: 113<br>Which commands are required to properly configure a router to run OSPF and to add network<br>192.168.16.0/24 to OSPF area 0? (Choose two)<br>A. Router(config)# router ospf 0<br>B. Router(config)# router ospf 1<br>C. Router(config)# router ospf area 0<br>D. Router(config-router)# network 192.168.16.0 0.0.0.255 0<br>E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0<br>F. Router(config-router)# network 192.168.0 255.255.255.0 area 0<br>Answer: B, E (A怎么不能选择)<br><br>OSPF的进程号，看看从多少开始的：）

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QUESTION NO: 34<br>You are a network technician at TestKing. A newly appointed trainee wants to know what the differences<br>and similarities between bridges and switches are.<br>What would your reply be? (Choose all that apply.)<br>A. Bridges are faster learners than switches due to fewer ports.<br>B. Bridges and switches increase the size of a collision domain.<br>C. A bridge will forward a broadcast but a switch will not.<br>D. Bridges and switches learn MAC addresses through examining the source MAC address.<br>E. A switch is a uniport bridge,<br>Answer: B C　 （D的怎么不行 应该是B,D）<br><br>BD