One ofthe main resposibilities ofICMP is to report () . Although technology hasproduced increasingly relaible transmission media, errors still exist and must be handled. IP isan () protocol. This means that error checking and error control are not a concem ofIP. ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP doesnot () errors, it simply report them. Error correction is left to the higher-levelpotocols. Error messages are always sent to the original () because the only informationavailable in the datagram about the route is the source and destination IP addresses. ICMP usethe source IP address to sent the error massage to the source ofthe().
Error messages are always sent to the original()because the only informationavailable in the datagram about the route is the source and destination IP addresses.
A.user
B.destination
C.source
D.program
A.主存
B.辅存
C.寄存器
D.高速缓存
A.BCD码
B.ASCII码
C.海明码
D.CRC码
A.发明人
B.翻译人
C.汇编人
D.委托人
A.>
B.<
C.&
D.“
A.
B.
C.
D.
A.AES
B.RSA
C.IDEA
D.DES
A./var
B./etc
C./dev
D./root
SMTP建立的是()连接,使用端口为()。
使用端口为()
A.20
B.21
C.23
D.25