plz! solve the all of questions

(7) Which of the following statement about sliding window is not true? () A. The sending window can control the flow of the sender. B. When the received data sequence number falls outside of the receiving window, the receiver discards it. C. The sending window only slides forward when the receiving window slides forward. D. The size of the sending window is set by the application. (8) The sender sent a TCP segment with the sequence number of 70 , and got acknowledgment number of 100. Then the TCP segment has ( ) bytes of data. A. 70 B. 31 C. 30 D. 71 (9) In IEEE802.3 Ethernet, frames smaller than ( ) bytes are called invalid frames A.64B.128C.256D.512 (10) The main Email transport protocol used by the Internet is the () protocol. A. FTP B. SMTP C. SNMP D. IMAP (7) Which of the following statement about sliding window is not true? () A. The sending window can control the flow of the sender. B. When the received data sequence number falls outside of the receiving window, the receiver discards it. C. The sending window only slides forward when the receiving window slides forward. D. The size of the sending window is set by the application. (8) The sender sent a TCP segment with the sequence number of 70 , and got acknowledgment number of 100. Then the TCP segment has ( ) bytes of data. A. 70 B. 31 C. 30 D. 71 (9) In IEEE802.3 Ethernet, frames smaller than ( ) bytes are called invalid frames A.64B.128C.256D.512 (10) The main Email transport protocol used by the Internet is the () protocol. A. FTP B. SMTP C. SNMP D. IMAP