6．网桥实现的寻址是

A.网络地址寻址                                               B.主机地址寻址

C.MAC地址寻址                                              D.端口地址寻址

7．为了将具有大量数据传输的企业局域网与广域网相连，不宜采用的连接方式是

A.DDN网                                                        B.ATM网

C.PSTN拨号线路                                            D.帧中继

8．在Internet中发送电子邮件使用的协议是

A.SNMP协议                                                   B.SMTP协议

C.POP协议                                                      D.IMCP协议

9．网络新闻组(USENET)进行收发网络新闻使用的协议是

A.TCP                                                             B.UDP

C.HTTP                                                           D.NNTP

10．下列属于合法的java script变量名的是

A.true                                                              B.3d

C.abc *                                                            D._abc

11.用作商业组织的域名是

A.com                                                              B.edu

C.gov                                                               D.cn

12．用HTML制作网页时，用一系列的标记符号描述其格式。标记名是写在

A.{ }内                                                            B.［］内

C.< >内                                                           D.( )内

13．路由器工作在TCP/IP协议簇的

A.网络接口层                                                  B.网络互连层

C.传输层                                                         D.应用层

14．简单邮件传送协议默认的端口号是

A.21                                                                B.23

C.25                                                                D.53

15．在URL描述格式的访问方法部分，目前大多数Web使用

A.gopher                                                          B.mailto

C.news                                                            D.http