Anytime a host or a router has an IP datagram to send to another host or router， it has the （ ） address of the receiver. This address is obtained from the DNS if the sender is the host or it is found in a routing table if the sender is a router. But the IP datagram must be （ ） in a frame to be able to pass through the physical network. This means that the sender needs the （ ） address of the receiver. The host or the router sends an ARP query packet. The packet includes the physical and IP addresses of the sender and the IP address of the receiver. Because the sender does not know the physical address of the receiver， the query is （ ） over the network. Every host or router on the network receives and processes the ARP query packet， but only the intended recipient recognizes its IP address and sends back an ARP response packet.The response packet contains the recipient's IP and physical addresses. The packet is （ ）directly to the inquirer by using the physical address received in the query packet.
问题1选项
A.port
B.hardware
C.physical
D.logical
问题2选项
A.extracted
B.encapsulated
C.decapsulated
D.decomposed
问题3选项
A.local
B.network
C.physical
D.logical
问题4选项
A.multicast
B.unicast
C.broadcast
D.multiple unicast
问题5选项
A.multicast
B.unicast
C.broadcast
D.multiple unicast
正确答案及解析
正确答案
解析
答案： D、B、C、C、B
无论何时主机或路由器都有IP数据报要发送到另一台主机或路由器上，它都有接收器的（71）地址。如果发件人是主机，则从DNS获取此地址；如果发件人是路由器，则在路由表中找到该地址。但是IP数据报必须在帧中（72）才能够通过物理网络。 这意味着发送方需要接收方的（73）地址。
主机或路由器发送ARP查询报文。该数据包包括发送方的物理和IP地址以及接收方的IP地址。因为发送方不知道接收方的物理地址，所以查询是（74）通过网络。网络上的每个主机或路由器都会接收并处理ARP查询数据包，但只有预期的接收方才能识别其IP地址并发回ARP响应数据包。
响应数据包包含收件人IP和物理地址。 通过使用在查询分组中接收的物理地址， 数据包直接（75）到查询者。
（ 71 ） A. 端口 B. 硬件 C. 物理 D. 逻辑
（ 72 ） A. 提取 B. 封装 C. 解封装 D. 分解
（ 73 ） A. 本地 B. 网络 C. 物理 D. 逻辑
（ 74 ） A . 组播 B. 单播 C. 广播 D . 多个单播
（ 75 ）A . 组播 B. 单播 C. 广播 D . 多个单播
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