Outline Network Layer and Internetworking The TCP/IP protocol suit ATM MPLS

Queueing Systems Used for analyzing network performance In packet networks, events are random Random packet arrivals

Routing Must choose routes for various origin destination pairs (O/D pairs) or for various sessions – Datagram routing: route chosen on a packet by packet basis Using datagram routing is an easy way to split paths – Virtual circuit routing: route chosen a session by session basis

Broadcast Routing Route a packet from a source to all nodes in the network Possible solutions: – Flooding: Each node sends packet on all outgoing links Discard packets received a second time – Spanning Tree Routing: Send packet along a tree that includes all of the nodes in the network

Responsible for reliable transmission of packets over a link – Framing: Determine t he star t and end of packets (sec 2.5) – Error Detection: Determine w hen a packet contains errors (sec 2.3) – Error recovery: Retransmissio n of packets containing errors (sec 2..4)

主要学习内容: 1.1计算机网络的发展过程 1.2计算机网络的组成 1.3计算机网络的功能 1.4计算机网络的分类 1.5计算机网络的拓朴结构 1.6计算机网络的标准及相关标准化组织

• 数据通信系统 • 基本概念 • 传输介质 • 数据编码 • 多路复用技术 • 数据交换技术 • 差错控制 • 数据通信性能指标

西安电子科技大学：《数据通信与计算机网络》课程教学资源（PPT课件）数字数据通信技术——异步与同步传输

通过本章学习,应掌握以下内容: ●网络安全隐患 ●加密技术基本知识 ●身份认证技术 ●网络安全标准、措施和有关法规

主要学习内容: 2.1数据通信系统组成 2.2数据通信的基本概念 2.3数据编码技术 2.4数据通信的基本方式 2.5多路复用技术 2.6数据交换方式 2.7差错检验和控制