protocol port. (匹配下列的应用层服务和它们对应的传输层协议端口)：
A. SMTP 1. TCP/23
B. FTP 2. TCP/25
C. TFTP 3. TCP/80
D. Te l n e t 4. TCP/21
E. HTTP 5. UDP/69
F. DNS 6. TCP/53
2) Which OSI reference model layer does Telnet function at (Te l n e t在哪一个O S I参考模型层运作)？
A. Transport 下载
B. Network
C. Session
D. Application
3) How many layers does the TCP/IP protocol suite have, compared to the OSI reference
model (和O S I参考模型相比，T C P / I P协议具有几层)？
A. TCP model has 4, OSI model has 6
B. TCP model has 7, OSI model has 8
C. TCP model has 4, OSI model has 7
D. TCP model has 7, OSI model has 4
4) The TCP/IP protocol suite has a formal session layer that includes NetBIOS、RPCs and
TLI functions (TCP/IP协议套件具有包含N e t B I O S、R P C和T L I功能的一个正式的会话层)。
A. True
B. False
5) What is the function of RPCs (RPC的功能是什么)？
A. To move files from remote PCs to a local PC
B. To make remote function calls transparent, so they appear to be local
C. To initialize a program on a remote PC
D. To send a procedure that is local to a remote node for processing elsewhere
