IoT Network Network Layer 复习笔记 南安

Connectionless vs. Connection-oriented

• Internet communications use IP (Internet Protocol), connectionless
• Connections across internet are virtual –data delivered even though network layer provides a connectionless service (transport layer provides a virtual connection).

Store-and-Forward Packet Switching 储存转发分组交换
Connection-Oriented – Virtual Circuits 面向连接的虚拟电路 P10
Routing vs. Forwarding 路由与转发

路由算法：

• Flooding 洪泛路由
• Distance Vector Routing 距离-向量路由算法
  The “Count-to-Infinity” Problem
• Link State Routing 链路状态路由
  Link State Packet（LSP）链路状态数据包 Seq. number and age are used for reliable flooding
  Dijkstra’s algorithm sink tree
  最短路径算法 https://www.cnblogs.com/yangyuke/p/9806828.html

Congestion Control 拥塞控制
https://blog.csdn.net/ao__ao/article/details/86564484

• Traffic Aware Routing 流量感知
  Choose routes depending on traffic, not just topology 根据流量选择路线，而不仅仅是拓扑
• Admission Control 准入控制
  Admission control allows a new traffic load only if the network has sufficient
  capacity, e.g., with virtual circuits
  只有当网络具有足够的容量（例如，具有虚拟电路）时，准入控制才允许新的业务负载
• Traffic Throttling
  Congested routers signal hosts to slow down traffic 拥挤的路由器向主机发出信号以降低流量
• Load Shedding 负载脱落 When all else fails, network will drop packets (shed load)

Application Requirements 应用需求
https://blog.csdn.net/ao__ao/article/details/86577554

Traffic Shaping 流量整形
Token buckets 漏桶

Packet Scheduling 包调度

Packet Scheduling P15（没看）

Internetworking based on a common network layer IP

Tunnelling 隧道 IPv4包里装IPv6包

Packet Fragmentation 数据包分段

• Transparent-packets fragmented / reassembled in each network
• Non-transparent-fragments are reassembled at destination

IP Addresses https://blog.csdn.net/ao__ao/article/details/86611672

• Subnets 子网
• Aggregation 聚合 Aggregation joins multiple IP prefixes into a single larger prefix to reduce
  routing table size
• NAT (Network Address Translation) 网络地址转换

Internet Control Protocols Internet控制协议

• ICMP (Internet Control Message Protocol) Internet控制消息协议
• ARP (Address Resolution Protocol) 地址解析协议