60分钟速通IPv6:从零到精通

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在"HELP! I Need to Learn IPv6 in 60 minutes.ppt"这份由Rick Graziani制作的PPT中,作者以其著作《IPv6 Fundamentals: A Straightforward Approach》为基础,为学习者提供了一个高效的一小时速成课程,专注于IPv6的核心概念。以下是课程的主要知识点概要: 1. **IPv4地址空间枯竭**: 开篇强调了IPv4地址空间的严重不足,2011年1月31日,Internet Assigned Numbers Authority (IANA)分配了最后一个/8 IPv4地址块给 Regional Internet Registries (RIRs),表明IPv4地址的可用性急剧减少。RIR们的库存有限,许多互联网服务提供商(ISPs)已经面临地址短缺,有些甚至已经用尽。 2. **转向IPv6的原因**: 在三张幻灯片内概述了转向IPv6的紧迫性,包括全球地址空间的缺乏,这将直接影响互联网的可持续发展。 3. **IPv6地址表示**: 这部分介绍了IPv6地址的结构和表示方式,与IPv4相比,IPv6使用128位地址,可以提供极大的地址空间,这对于连接数量增长的网络是至关重要的。 4. **全球单播地址与链接本地地址**: 学习者将了解到IPv6地址分为两种类型:全球单播地址(Global Unicast)用于全球范围内的通信,以及链接本地地址(Link-local Unicast),在网络内部进行通信,当无法获得全球路由时作为临时解决方案。 5. **状态无感知地址自动配置 (SLAAC)**: SLAAC是IPv6中的一种自动配置机制,无需DHCP服务器,设备可以基于网络环境动态获取IPv6地址,这对于移动设备和自动配置的网络环境特别实用。 6. **DHCPv6**: DHCPv6是IPv6版本的动态主机配置协议,区分了无状态(Stateless)和有状态(Stateful)两种模式。无状态DHCPv6允许设备轻松配置而无需长期的服务器交互,对于家庭网络部署有重要作用。 7. **前缀分配与家庭网络IPv6**: DHCPv6支持前缀分配,使得IPv6能够更有效地服务于家庭用户,确保每个连接设备都能得到独立的地址范围,即使在有限的全局地址池中也能有效利用。 8. **访问额外资源**: 提供了Rick Graziani的个人网站(<http://www.cabrillo.edu/~rgraziani/>),那里有更多关于IPv6基础的现场课程和所有PPT演讲的访问权限,以便进一步深入学习。 通过这个60分钟的速成课程,学习者可以在短时间内掌握IPv6的基本原理和应用,了解为何IPv6是未来互联网的关键技术,并为实际部署或升级网络做好准备。

Based on the following story, continue the story by writing two paragraphs, paragraph 1 beginning with "A few weeks later, I went to the farm again. " and paragraph 2 beginning with "I was just about to leave when the hummingbird appeared."respectively with 150 words. I was invited to a cookout on an old friend's farm in western Washington. I parked my car outside the farm and walked past a milking house which had apparently not been used in many years.A noise at a window caught my attention,so I entered it. It was a hummingbird,desperately trying to escape. She was covered in spider-webs and was barely able to move her wings. She ceased her struggle the instant I picked her up. With the bird in my cupped hand, I looked around to see how she had gotten in. The broken window glass was the likely answer. I stuffed a piece of cloth into the hole and took her outside,closing the door securely behind me. When I opened my hand, the bird did not fly away; she sat looking at me with her bright eyes.I removed the sticky spider-webs that covered her head and wings. Still, she made no attempt to fly.Perhaps she had been struggling against the window too long and was too tired? Or too thirsty? As I carried her up the blackberry-lined path toward my car where I kept a water bottle, she began to move. I stopped, and she soon took wing but did not immediately fly away. Hovering,she approached within six inches of my face. For a very long moment,this tiny creature looked into my eyes, turning her head from side to side. Then she flew quickly out of sight. During the cookout, I told my hosts about the hummingbird incident. They promised to fix the window. As I was departing, my friends walked me to my car. I was standing by the car when a hummingbird flew to the center of our group and began hovering. She turned from person to person until she came to me. She again looked directly into my eyes, then let out a squeaking call and was gone. For a moment, all were speechless. Then someone said, “She must have come to say good-bye.”

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