阅读以下说明，回答下列问题。
[说明] 某公司两分支机构之间的网络配置如图6-18所示，为保护通信安全，在路由器router-a和router-b上配置IPSec安全策略，对192.168.8.0/24网段和192.168.9.0/24网段之间数据进行加密处理。
[问题1] 为建立两个分支机构之间的通信，请完成下面的路由配置命令。
router-a(config)#ip router 0.0.0.0 0.0.0.0 （）
router-b(config)#ip router 0.0.0.0 0.0.0.0 （）
参考答案：25.25.254；201.18.8.254
解析：
[分析]： 隧道是建立在已连通的路由上的。ipsec只是加密，tunne1是建立隧道。应填接入Internet的对应网关地址，即(1)203.25.25.254，(2)201.18.8.254。
I'm thinking about what I'm going to do this summer. Maybe I'll get a job. If I get a job, I'll have ____money to buy some new things. I'd like to have some new dresses ____ I start school again in September. I can also buy some books or some music CDs. I really love jazz(爵士乐)．I could buy some more CDs____my jazz collection. Or I can use the money ____tennis lessons. I can play tennis ____，but I'd like to learn to play it much better. Or maybe I can use the money to pay for the piano lessons.I'd like to learn to play the piano，too. If I don't get a job this summer, I'll visit my grandparents in San Francisco. They live in a beautiful old house ____ the sea. My grandparents are always very nice to me. They'll let me sleep late. I ____ have to get up until 10 o'clock every day. I'll eat delicious food because my grandmother is an excellent ____. She always cooks my favorite food. I'll also go to the ____ with my grandparents. Because I like swimming in the sea. My grandparents like to go to museums but I don't enjoy it so much, so maybe I'll ____to watch TV.
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