CISSP考试指南笔记:4.16 快速提示

Wesley13
• 阅读 637
  • A protocol is a set of rules that dictates how computers communicate over networks.

  • The application layer, layer 7, has services and protocols required by the user’s applications for networking functionality.

  • The presentation layer, layer 6, formats data into a standardized format and deals with the syntax of the data, not the meaning.

  • The session layer, layer 5, sets up, maintains, and breaks down the dialog (session) between two applications. It controls the dialog organization and synchronization.

  • The transport layer, layer 4, provides end-to-end transmissions.

  • The network layer, layer 3, provides routing, addressing, and fragmentation of packets. This layer can determine alternative routes to avoid network congestion.

  • Routers work at the network layer, layer 3.

  • The data link layer, layer 2, prepares data for the network medium by framing it. This is where the different LAN and WAN technologies work.

  • The physical layer, layer 1, provides physical connections for transmission and performs the electrical encoding of data. This layer transforms bits to electrical signals.

  • TCP/IP is a suite of protocols that is the de facto standard for transmitting data across the Internet. TCP is a reliable, connection-oriented protocol, while IP is an unreliable, connectionless protocol.

  • Data is encapsulated as it travels down the network stack on the source computer, and the process is reversed on the destination computer. During encapsulation, each layer adds its own information so the corresponding layer on the destination computer knows how to process the data.

  • Two main protocols at the transport layer are TCP and UDP.

  • UDP is a connectionless protocol that does not send or receive acknowledgments when a datagram is received. It does not ensure data arrives at its destination. It provides “besteffort” delivery.

  • TCP is a connection-oriented protocol that sends and receives acknowledgments. It ensures data arrives at the destination.

  • ARP translates the IP address into a MAC address (physical Ethernet address), while RARP translates a MAC address into an IP address.

  • ICMP works at the network layer and informs hosts, routers, and devices of network or computer problems. It is the major component of the ping utility.

  • DNS resolves hostnames into IP addresses and has distributed databases all over the Internet to provide name resolution.

  • Altering an ARP table so an IP address is mapped to a different MAC address is called ARP poisoning and can redirect traffic to an attacker’s computer or an unattended system.

  • Packet filtering (screening routers) is accomplished by ACLs and is a first-generation firewall. Traffic can be filtered by addresses, ports, and protocol types.

  • Tunneling protocols move frames from one network to another by placing them inside of routable encapsulated frames.

剩余内容请看本人公众号debugeeker, 链接为CISSP考试指南笔记:4.16 快速提示

本文同步分享在 博客“debugeeker”(CSDN)。
如有侵权,请联系 support@oschina.cn 删除。
本文参与“OSC源创计划”,欢迎正在阅读的你也加入,一起分享。

点赞
收藏
评论区
推荐文章
blmius blmius
3年前
MySQL:[Err] 1292 - Incorrect datetime value: ‘0000-00-00 00:00:00‘ for column ‘CREATE_TIME‘ at row 1
文章目录问题用navicat导入数据时,报错:原因这是因为当前的MySQL不支持datetime为0的情况。解决修改sql\mode:sql\mode:SQLMode定义了MySQL应支持的SQL语法、数据校验等,这样可以更容易地在不同的环境中使用MySQL。全局s
待兔 待兔
4个月前
手写Java HashMap源码
HashMap的使用教程HashMap的使用教程HashMap的使用教程HashMap的使用教程HashMap的使用教程22
Wesley13 Wesley13
3年前
CISSP考试指南笔记:2.3 责任分层
Seniormanagementalwayscarriestheultimateresponsibilityfortheorganization.ExecutiveManagementTheCFOandCEOareresponsibleforinformingstakeho
Stella981 Stella981
3年前
Android So动态加载 优雅实现与原理分析
背景:漫品Android客户端集成适配转换功能(基于目标识别(So库35M)和人脸识别库(5M)),导致apk体积50M左右,为优化客户端体验,决定实现So文件动态加载.!(https://oscimg.oschina.net/oscnet/00d1ff90e4b34869664fef59e3ec3fdd20b.png)点击上方“蓝字”关注我
Wesley13 Wesley13
3年前
CISSP考试指南笔记:2.8 快速提示
Informationgoesthroughalifecyclethatstartswithitsacquisitionandendswithitsdisposal.Eachphaseoftheinformationlifecyclerequiresdifferentconsideration
Wesley13 Wesley13
3年前
00:Java简单了解
浅谈Java之概述Java是SUN(StanfordUniversityNetwork),斯坦福大学网络公司)1995年推出的一门高级编程语言。Java是一种面向Internet的编程语言。随着Java技术在web方面的不断成熟,已经成为Web应用程序的首选开发语言。Java是简单易学,完全面向对象,安全可靠,与平台无关的编程语言。
Stella981 Stella981
3年前
CISSP考试指南笔记:1.4 安全框架part1
这一节非常重要,在后面章节都会遇到,而且考试都或多或少会遇到。在我们进入如何开发组织范围内的安全计划之前,让我们先来看看什么不能做,这就是所谓的晦涩安全。晦涩安全概念是假设你的敌人没有你聪明,他们无法弄懂得你觉得非常棘手的事情。安全规划是由许多实体组成的框架:逻辑、管理和物理保护机制;程序;业务流程;以及为环境提供保护级别的人员。
Wesley13 Wesley13
3年前
CISSP考试指南笔记:3.5 安全模型
Asecuritymodelmapstheabstractgoalsofthepolicytoinformationsystemtermsbyspecifyingexplicitdatastructuresandtechniquesnecessarytoenforcethesecuritypolicy.
Wesley13 Wesley13
3年前
MySQL部分从库上面因为大量的临时表tmp_table造成慢查询
背景描述Time:20190124T00:08:14.70572408:00User@Host:@Id:Schema:sentrymetaLast_errno:0Killed:0Query_time:0.315758Lock_
Python进阶者 Python进阶者
10个月前
Excel中这日期老是出来00:00:00,怎么用Pandas把这个去除
大家好,我是皮皮。一、前言前几天在Python白银交流群【上海新年人】问了一个Pandas数据筛选的问题。问题如下:这日期老是出来00:00:00,怎么把这个去除。二、实现过程后来【论草莓如何成为冻干莓】给了一个思路和代码如下:pd.toexcel之前把这