MPLS域中的各LSR使用______协议交换报文，找出LSP，据此构造出分组转发表。
A．RSVP
B．SLA
C．LDP
D．GRE
参考答案：C
解析： MPLS技术能够采用标记进行快速交换的关键在于MPLS网络中存在着标记通道机制，而标记通道是由网络层路由协议一一标记分发协议(LDP)建立的。可以把LDP理解成沿着IP寻路协议确定的路径自动建立标记通道的协议，它由一组相应的规程组成。通过这些规程，标记交换路由器(LSR)能够向另一个LSR通知它所绑定的“标记/转发等价类FEC”。
| 阅读理解。 |
| In 1955, Walt Disney (迪斯尼) himself opened the first Disney Park in Los Angeles, the USA. Later Disney world was opened in Florida in 1971. It cost between $ 500 and $ 600 million to build. Tokyo Disney Park opened in Japan in 1983, and Europe (欧洲) Disney opened in France in 1992. Now Hong Kong is going to build a Disney Park and it will be open in 2005. More than 80% of Hong Kong's population would like to visit the Disney Park when it's opened. But about half of them thought the adult admission fee (成人参观费), of between HK $250 to HK $ 300 (US $ 32 to US $ 38), was too high. The children's admission fee is not known yet. But children may not mind paying any entrance fee. "If I start saving money now, I'll have enough money to pay the entrance fee in five years' time," said Chan Po-sang, a 12-year old girl. "I can't take my son to the Disney Park in the USA," said Mrs. Yu, mother of a small boy, "That's why I agree with the government's plan (政府计划) to build one here. Then I'll be able to take my son there. The admission fee of several hundred dollars is nothing compared with (与...相比) the price of an air ticket to the USA." |
| 1. The first Disney Park was built in ______. |
[ ] |
| A. France B. Tokyo C. America D. Hong Kong |
| 2. How many Disney Parks will there be in Asia (亚洲) by the year 2005? |
[ ] |
| A. 1 B. 2 C. 3 D. 4 |
| 3. What do the Hong Kong people think about the plan? |
[ ] |
| A. Most of them agree with it. B. Half of them don't agree with it. C. Few of them agree with it. D. Only children like it. |
| 4. Do all the Hong Kong people care (关心) much about the entrance fee? |
[ ] |
| A. Yes, they all think that the fee is too high. B. No, the children may not mind how much the fee will be. C. Yes, most of them feel that the fee is not high. D. The writer doesn't tell us. |
| 5. According to the passage, which of the following is TRUE? |
[ ] |
| A. The adult admission fee is lower than the children admission fee. B. Disney Parks are getting more and more popular among children and adults. C. The children's admission fee is about HK $ 250 to HK $ 300. D. Since the fee is too high, few Hong Kong people want to visit the park.. |