时分多路复用是指各路信号在同一信道上占用不同的(1),无线通信中使用的CDMA是一种(2)技术。 空白(1)处应选择()
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下面加密算法中,加密和解密需要用不同密钥的是()。
AES
B. RSA
C. IDEA
DES
为用户提供远程登录功能的协议是(1),其访问端口默认为(2)。 空白(1)处应选择()
A. FTP
B. EMAIL
C. TELNET
D. QQ
网址http://www.tsinghua.edu.cn表示其对应的网站属于()。
A. 教育部门,国家域名是edu
B. 政府部门,国家域名是cn
C. 教育部门,国家域名是cn
D. 政府部门,国家域名是edu
One ofthe main resposibilities of ICMP is to report(1).Although technology has produced increasingly relaible transmission media, errors still exist and must be handled. IP is an (2) protocol. This means that error checking and error control are not a concern of IP. ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP does not (3) errors, it simply report them. Error correction is left to the higher-level potocols. Error messages are always sent to the original (4) because the only information available in the datagram about the route is the source and destination IP addresses. ICMP use the source IP address to sent the error massage to the source of the (5). 空白(3)处应选择()
A. correct
B. conduct
C. product
D. connect