简述TCP终止连接过程的四向握手法。
参考答案：第1步：发送方TCP发送FIN报文段。
第2步：接收方TCP收到FIN报文段后发送ACK报文段，其确认号是FIN报文段序号+1。
第3步：接收方TCP继续向发送方发送剩余的数据直至发送完毕，然后发送FIN报文段。
第4步：发送方发送ACK报文段．证实从接收方收到了FIN报文段。ACK报文段的确认号=FIN报文段序号+1。
| 根据短文内容，回答下 * * 个问题。 |
| Sunshine Middle School goes to the final! Our school basketball team needs your support! It is in the final of the basketball competition! The match takes place at South Hill School in Moonlight Town on Saturday, 17 November. Don't forget to bring your friends! |
| ● Cheer for our team! ● Lunch at Star Restaurant ● $10-Bus fare(车费) and lunch ● 9 a.m. -2 p.m. (Match starts at 10:30 a.m.) With your support, we will win! Buy your ticket now! |  |
| 1. Does Sunshine Middle School need support? _________________________________________ 2. What time is the match going to begin on that day? _______________________________________ 3. Where is lunch going to be? ________________________________________ 4. How much is bus fare and lunch? ________________________________________ 5. What advice does the poster give us? ________________________________________ |