Computer Networks · 免费预览
需求与连通性
连通性必须扩展到全球互联网，因此节点通过链路连入交换网络，网络再递归地嵌套成互联网络；每个节点都携带一个地址，路由将消息转发至目的地；经济高效地共享链路依靠统计复用，而非固定的时分或频分；应用需要具有可靠性、有序性等属性的逻辑信道；再加上三类故障和可管理性的负担，这些共同构成了网络设计必须满足的需求。
1. Connectivity at scale
Connectivity at scale
2. Sharing links cost-effectively
Sharing links cost-effectively
3. Channels and common services
Channels and common services
4. Surviving failure and staying manageable
Surviving failure and staying manageable
5. The cost of a full mesh
Why is connecting every host directly to every other host not a viable plan for a large network?
6. The three failure classes
Which list correctly names the three classes of failure a network must survive, from smallest to largest granularity?
7. Why statistical multiplexing wins
Why does statistical multiplexing outperform time-division and frequency-division multiplexing for computer traffic?
8. The two channel types
A videoconference and a file download place opposite demands on a channel. Which pairing of channel to requirement is correct?
9. Lost versus late
What makes a lost packet fundamentally hard to handle, compared with a corrupted one?
10. Stability against velocity
What is the central tension in managing modern networks that the rise of the cloud has sharpened?
11. The sharing technique
What is the name of the multiplexing technique in which flows transmit on demand rather than in fixed slots or bands, and which earns its efficiency from the burstiness of computer traffic? Two words.
12. The forwarding process
What is the name of the systematic process by which switches and routers use a destination address to forward a message toward the node that should receive it?
13. Three failure granularities
At the smallest granularity, interference flips individual symbols in transit. What are these smallest failures called?
14. The semantic gap
The distance between what an application expects from a channel and what the underlying network technology can actually provide is a named design problem. What is it called?