配置POP3服务器时，邮件服务器中默认开放TCP的__（37）__端口。

A、TCP

B、UDP

C、SNMP

D、SOCKET

A. TCP

B. IP

C. HTTP

D. SMTP

A．TCP的25端口 $amp;>amp;$gt;

B．TCP的110端口

C．UDP的25端口

D．UDP的110端口

A、SMTP服务器

B、WWW服务器

C、POP3服务器

D、IMAP服务器

A.特洛伊木马攻击

B.SYN Flooding攻击

C.端口欺骗攻击

D.IP欺骗攻击

A.213.127.115.31

B.213.127.115.255

C.213.127.115.254

D.224.1.1.1

A.IEEE802.11a

B.IEEE802.11b

C.IEEE802.11g

D.IEEE802.11n

The defacto standard Application Program Interface （API） for TCP/IP applications is the “sockets” interface. Although this API was developed for __（71）__ in the early 1980s it has also been implemented on a wide variety of non-Unix systems。 TCP/IP __（72）__ written using the sockets API have in the past enjoyed a high degree of portability and we would like the same __（73）__ with IPv6 applications。 But changes are required to the sockets API to support IPv6 and this memo describes these changes。These include a new socket address structure to carry IPv6 __（74）__，new address conversion functions，and some new socket options。These extensions are designed to provide access to the basic IPv6 features required by TCP and UDP applications，including multicasting， while introducing a minimum of change into the system and providing complete __（75）__ for existing IPv4 applications。

A.Windows

B.Linux

C.Unix

D.DOS