CISSP考试指南笔记:4.16 快速提示

Wesley13
• 阅读 356
  • 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
秃头王路飞 秃头王路飞
5个月前
webpack5手撸vue2脚手架
webpack5手撸vue相信工作个12年的小伙伴们在面试的时候多多少少怕被问到关于webpack方面的知识,本菜鸟最近闲来无事,就尝试了手撸了下vue2的脚手架,第一次发帖实在是没有经验,望海涵。languageJavaScript"name":"vuecliversion2","version":"1.0.0","desc
技术小男生 技术小男生
5个月前
linux环境jdk环境变量配置
1:编辑系统配置文件vi/etc/profile2:按字母键i进入编辑模式,在最底部添加内容:JAVAHOME/opt/jdk1.8.0152CLASSPATH.:$JAVAHOME/lib/dt.jar:$JAVAHOME/lib/tools.jarPATH$JAVAHOME/bin:$PATH3:生效配置
光头强的博客 光头强的博客
5个月前
Java面向对象试题
1、请创建一个Animal动物类,要求有方法eat()方法,方法输出一条语句“吃东西”。创建一个接口A,接口里有一个抽象方法fly()。创建一个Bird类继承Animal类并实现接口A里的方法输出一条有语句“鸟儿飞翔”,重写eat()方法输出一条语句“鸟儿吃虫”。在Test类中向上转型创建b对象,调用eat方法。然后向下转型调用eat()方
刚刚好 刚刚好
5个月前
css问题
1、在IOS中图片不显示(给图片加了圆角或者img没有父级)<div<imgsrc""/</divdiv{width:20px;height:20px;borderradius:20px;overflow:h
小森森 小森森
5个月前
校园表白墙微信小程序V1.0 SayLove -基于微信云开发-一键快速搭建,开箱即用
后续会继续更新,敬请期待2.0全新版本欢迎添加左边的微信一起探讨!项目地址:(https://www.aliyun.com/activity/daily/bestoffer?userCodesskuuw5n)\2.Bug修复更新日历2.情侣脸功能大家不要使用了,现在阿里云的接口已经要收费了(土豪请随意),\\和注意
晴空闲云 晴空闲云
5个月前
css中box-sizing解放盒子实际宽高计算
我们知道传统的盒子模型,如果增加内边距padding和边框border,那么会撑大整个盒子,造成盒子的宽度不好计算,在实务中特别不方便。boxsizing可以设置盒模型的方式,可以很好的设置固定宽高的盒模型。盒子宽高计算假如我们设置如下盒子:宽度和高度均为200px,那么这会这个盒子实际的宽高就都是200px。但是当我们设置这个盒子的边框和内间距的时候,那
艾木酱 艾木酱
5个月前
快速入门|使用MemFire Cloud构建React Native应用程序
MemFireCloud是一款提供云数据库,用户可以创建云数据库,并对数据库进行管理,还可以对数据库进行备份操作。它还提供后端即服务,用户可以在1分钟内新建一个应用,使用自动生成的API和SDK,访问云数据库、对象存储、用户认证与授权等功能,可专
Wesley13 Wesley13
1年前
CISSP考试指南笔记:2.8 快速提示
Informationgoesthroughalifecyclethatstartswithitsacquisitionandendswithitsdisposal.Eachphaseoftheinformationlifecyclerequiresdifferentconsideration
NVIDIA安培架构下MIG技术分析
关键词:NVIDIA、MIG、安培一什么是MIG2020年5月,NVIDIA发布了最新的GPU架构:安培,以及基于安培架构的最新的GPU:A100。安培提供了许多新的特性,MIG是其中一项非常重要的新特性。MIG的全名是MultiInstanceGPU。NVIDIA安培架构中的MIG模式可以在A100GPU上并行运行七个作业。多实
helloworld_28799839 helloworld_28799839
5个月前
常用知识整理
Javascript判断对象是否为空jsObject.keys(myObject).length0经常使用的三元运算我们经常遇到处理表格列状态字段如status的时候可以用到vue