网络安全 第三章 Internet协议的安全性

3.1 Internet 协议概述

TCP / IP 协议族

  • 网络接口层
    • TCP / IP 模型的最底层
  • 网际层
    • IP、ARP
  • 传输层
    • TCP、UDP
  • 应用层
    • HTTP、SMTP、POP3、FTP

网络安全 第二章 计算机网络基础知识

2.1 计算机网络的定义

将处于不同位置并具有独立功能的多个计算机系统通过通信线路网络设备连接起来,以实现网络资源共享, 此系统称为计算机网络

网络安全 第一章 引言

1.1 对网络安全需求

网络发展态势:计算机病毒、黑客攻击、系统漏洞、信息战

网络安全需求: - 敏感信息对安全的需求 - 信息密级:秘密级、机密级、绝密级 - 敏感非机密信息 - 网络应用对安全的需求

Computer Networking Chapter 5 The Link Layer: Links, Access Network

terminology:

  • hosts and routers: nodes
  • communication channels that connect adjacent nodes along communication path: links
    • wired links
    • wireless links
    • LANs
  • layer-2 packet: frame, encapsulates datagram

Computer Networking Chapter 4 The Network Layer

4.1 Introduction

4.1.1 Forwarding and Routing

  • forwarding: move packets from router's input to appropriate router output
  • routing: determine route taken by packets from source to dest.

Computer Networking Chapter 3 Transport Layer

3.1 Introduction and Transport-Layer Services

Transport services and protocols

  • provide logical communication between app process running on different hosts
  • transport protocols run in end systems
    • send side: break app messages into segments, passes to network layer
    • rcv side: reassembles segments into messages, passes to app layer
  • more than one transport protocol available to apps
    • Internet: TCP and UDP

Computer Networking Chapter 2 Application Layer

2.1 Principles of Network Applications

2.1.1 Network Application Architectures

  • Client-server
    • server
      • always-on host
      • permanent IP address
      • data centers for scaling
    • clients
      • communicate with server
      • may be intermittently connected
      • may have dynamic IP addresses
      • do not communicate directly with each other
  • peer-to-peer
    • no always-on server
    • arbitrary end systems directly communicate
    • peers request service from other peers, provide service in return to other peers
      • self scalability – new peers bring new service capacity, as well as new service demands
    • peers are intermittently connected and change IP addresses
      • complex management

Computer Networking Chapter 1 Introduction

1.1 What is the Internet?

1.1.1 A Nuts-and Bolts Description

Figure 1.1 Some pieces of the Internet

Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now

×