The () layer of the OSI model organizes bits from the physical layer into logical data units called frames.
A. physical
B. data-link
C. network
D. transport
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() is a protocol used for transferring files.
A. FTP
B. SMTP
C. TELNET
D. HTTP
() is a protocol that can access and transfer documents on the WWW.
A. FTP
B. SMTP
C. TELNET
D. HTTP
The transport layer protocol of TCP/IP is called ().
A. TCP
B. UDP
C. IP
D. a and b
2012年11月8日至14日,中国共产党第____全国代表大会在北京举行。( )
A. 十六次
B. 十七次
C. 十八次
D. 十九次