【名词&注释】
应用层(application layer)、计算机通信网(computer communication network)、物理层(physical layer)、通信子网(communication subnet)、会话层(session layer)、数据链路层(data link layer)、电子信箱(electronic mailbox)
[判断题]可用于海事救援通信或车船飞机的移动通信。（ ）
查看答案&解析
举一反三：
[单选题]电子信箱(electronic mailbox)业务是一种利用（）方式用户提供信函交换的基于计算机通信网的信息传递业务。
A. 实时交换
B. 直接连接
C. 存储转发
D. 接收存储
[单选题]100（）[1分]
A. WiMAX
B. WiMAX2
C. LTE AIE
D. IMT-Advanced
[多选题]阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the router’s network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the router’s routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.
A. is generating
B. generate
C. is generated
D. generates A．forwarding table
E. network interfaces
F. routing policies
G. destination address A．the destination address and network interfaces
H. forwarding table and network interfaces
I. the destination address and forward table
J. routing policies and routing table
[单选题]OSI7层参考模型中，属于通信子网功能的是（）。
A. 物理层、表示层、会话层
B. 运输层、会话层、应用层
C. 物理层、数据链路层(data link layer)、网络层
D. 物理层、网络层、运输层
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