192.168.5.62, with 192.168.5.32 used as the network IP address and 192.168.5.63 used as the broadcast IP address. Therefore, only choice C falls within the usable IP range.
这个以太网段的子网掩码是27，转换为二进制为255.255.255.224。在192.168.5.33/27中有效的子网是192.168.5.33-192.168.5.62，习惯使用192.168.5.33作为网络IP地址，192.168.5.62作为广播IP地址。因此，在可用的IP范围中选择C
7、如图所示：
Based on the diagram above, how many collision domains are present in the TestKing.com network??
基于这个图表，在这里有多少个冲突域？
A 、1个 B、2个 C、3个 D、4个 E、5个 F、6个 G、7个 答案：B
解析：Since hubs are being used for both Ethernet segments, there are a total of two collision domains. Routers do not forward broadcast and are used to segment LANs, so TestKingA consists of one collision domain while TestKingB consists of the second collision domain.
因为集线器经常用于以太网段中，有这两个冲突域的总数。路由器不能传送广播和分割局域网，因此TestKingA 是由一个冲突域组成而TestKingB 是第二个冲突域
8、下列的网络拓扑图，注意TestKing1 交换机和TestKing2集线器
Which of the devices shown can transmit simultaneously without causing collisions?
哪些设备能同时传输数据并且不会造成冲突？ A. All hosts
B. Only hosts attached to the switch
C. All hosts attached to the hub and one host attached to the switch D. All hosts attached to the switch and one host attached to the hub
A、所有主机 B、只有和交换机连接的主机 C、所有和集线器相连的主机和一个同交换机相连的主机 D、所有和交换机相连的主机与一个和集线器相连的主机
答案：B 解析：As we know switch is the device which avoids collisions. When two computers communicate through a switch they make their own collision domain. So, there is no chance of collisions. Whenever a hub is included, it supports on half duplex communication and works on the phenomena of CSMA/CD so, there is always a chance of collision.
正如我们所知道的交换机是避免冲突的设备，当两个计算机通过一个路由器通讯时它们将增大冲突域。因此，没有冲突的机会。无论何时包含一个集线器，它将支持一部分双方的连接并通过CSMA/CD工作，因此也总会有冲突的机会 9、
Study the network topology exhibit carefully, in particular the two switches TestKing1, TestKing2, and the router TestKing3.
Which statements are true in this scenario? Select two.
仔细研究这个网络拓扑图，特别是这两个交换机TestKing1，TestKing2和路由器TestKing3 ，下列哪个是正确的？选择2个
A. All the devices in both networks will receive a broadcast to 255.255.255.255 sent by host TestKingA.
B. Only the devices in network 192.168.1.0 will a broadcast to 255.255.255.255 sent by host TestKingA.
C. All the devices on both networks are members of the same collision domain.
D. The hosts on the 192.168.1.0 network form one collision domain, and the hosts on the 192.168.2.0 network form a second collision domain. E. Each host is in a separate collision domain.
A、在网络中的所有的设备都能收到一个255.255.255.255的广播，这广播是TestKingA发送的 B、只有在192.168.1.0网络中的设备能够接收到TestKingA发送的255.255.255.255广播 C、在所有网络中的所有设备在同一个冲突域 D、在192.168.0.1网络中的所有主机是一个冲突域，并且在192.168.2.0网络的主机是另外的一个冲突域 E、所有的主机是单独的冲突域 答案：B E
解析：The switch forms the collision domains. The router divides the broadcast domains and collision domains. The router doesn’t forward the broadcasts. So, hosts in networks 192.168.1.0 and 192.168.2.0 are in two different broadcast domains. Each host is in its own collision domain.
B是正确的，而D不是。如果图表中是使用集线器而不是用的交换机那就是正确的，这里只有2个冲突域，但是这图中有交换机。这作者可能是有意陈述那些正确的广播域 E是正确的，因为整个网络是由交换机组成的 10、Which address represents a unicast address? 哪个地址象征一个单播地址？
A. 224.1.5.2 B. FFFF. FFFF. FFFF. C. 192.168.24.59/30 D. 255.255.255.255 E. 172.31.128.255/18 答案：E
解析：172.31.128.255 is the only unicast address. It seems to be a broadcast address, because of 255 in the last octett, the broadcast address for this network is 172.31.131.255.
Not A: 224.1.5.2 is a multicast address. 172.31.128.255/18是唯一一个单播地址，它像一个广播地址，因为255 是最后的一位，这个网络的广播地址是 172.31.128.255 A 224.1.5.2 是多播地址
11、Wit regard to bridges and switches, which of the following statements are true? (Choose three.)
关于网桥和交换机，下列哪个陈述是正确的？
A. Switches are primarily software based while bridges are hardware based. B. Both bridges and switches forward Layer 2 broadcasts.
C. Bridges are frequently faster than switches.D. Switches typically have a higher number of ports than bridges.E. Bridges define broadcast domain while switches define collision domains.F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.
A交换机是基于软件的而网桥是基于硬件的 B、网桥和交换机都是在2层传送广播的 C、网桥比交换机快 D、交换机的端口号比网桥高 E、网桥定义的是冲突域而交换机是广播域 F、网桥和交换机所做的决定都是基于2层地址的 答案：BDF
12、Which Layer 1 devices can be used to enlarge the area covered by a single LAN segment? Select two
在1层设备中，哪个是通过一个单一的局域网段来扩大网络范围的？
A. Switch B. Router C. NIC D. hub E. Repeater F. RJ-45 transceiver A、 交换机 B、路由器 C、网卡 D、集线器 E、中继器 F、RJ-45收发器 答案：DE
解析：Both hub, Repeater, Router and Switch repeat the packet. But only hub and Repeater do not segment the network. 集线器，中继器和交换机都能够反复数据包，但是只有集线器和中继器不能分割网络
13、What information is supplied by CDP? Select three. CDP所提供的信息是什么？
A. Device identifiers B. Capabilities list C. Platform D. Route identifier E. Neighbour traffic data
A、设备标识符 B、性能列表 C、平台 D、路由标识符 E、相邻间传数据 答案：ABC 解析
CDP是一个思科私有的协议，支持在接口间传送CDP信息，这些接口必须支持SNAP首部。所有的局域网接口，HDLC，帧中继和ATM都支持CDP。路由器和交换机能够发现相邻路由的详细的3层地址—甚至没有配置3层协议—因为CDP不能支持依靠所有的3层协议
CDP发现的相邻设备的详细信息： 设备标识符—代表主机名
地址列表—网络地址和数据链路地址
端口标识符—标识端口的文本，一个端口的其他
性能列表—关于设备作什么的信息—例如端口，一个路由器或者交换机 平台—在设备中运行的模型和操作系统水平
14、If a host on a network has the address 172.16.45.14/30, what is the address of the subnetwork to which this host belongs?
如果一个网络中的主机地址是172.16.45.14/30，这个主机的子网是哪个地址？ A. 172.16.45.0 B. 172.16.45.4 C. 172.16.45.8 D. 172.16.45.12 E. 172.16.45.18 答案：D 解析：The last octet in binary form is 00001110. Only 6 bits of this octet belong to the subnet mask. Hence the subnetwork is 172.16.45.12.
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