下列网络攻击行为中，属于DoS攻击的是__（42）__。

A. 报文窃听

B. 死亡之ping

C. 泪滴

D. SYN洪水

A、信息收集

B、渗透攻击

C、权限提升

D、痕迹清除

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

A.2类UTP

B.3类UTP

C.5类UTP

D.光纤

A.SSL

B.IPsec

C.PGP

D.SET