Contents at a glance introduction xxv chapter 1 computer network fundamentals 2 chapter 2 the osi reference model 28 chapter 3 network components 60 chapter 4 ethernet technology 112 chapter 5 ipv4 and ipv6 addresses 148 chapter 6 routing ip packets 198 chapter 7 widearea networks 230 chapter 8 wireless lans 266 chapter 9 network optimization 296 chapter 10. Audit to track securityrelated events, such as logging onto the system or network, accessing objects, or exercising usergroup rights or privileges. Mathematical models of computer security matt bishop v. A system designed to prevent unauthorized access d. Computer networks a group of two or more computer systems linked together. They describe the physical and logical arrangement of the network nodes.
Computer and network security by avi kak lecture8 8. Attack in the context of computernetwork security, an attack is an attempt to access resources on a computer or a network without authorization, or to bypass security measures that are in place. After a successful setup, the communicating systems are connected by a set of links that are dedicated to their. Computer networks lecture notes shri vishnu engineering. Peer to peer networking clientserver networks are more suitable for larger networks.
This is especially true when the users have computers at home and have decided to help the network administrator or manager by making changes to the network without consulting the network staff. The subtype carries the specific file type such as jpeg or gif, tiff, and so on. Lu2 introduction to computer hardware lu3 introduction to computer software 07 hrs 14hrs 09 hrs nil 50 hrs 24 hrs module 2. San jose, ca 958 and department of computer sciences purdue university west lafayette, in 47907 fifth edition computer networks and internets upper saddle river, new jersey 07458. The purpose of this brief book is to give a general, nonmathematical, introduction to the technology of networks. And sometimes computers send a lot of information like a whole movie or a piece of software to install that might take minutes or even hours to download. Computer networks network architecture saad mneimneh computer science hunter college of cuny new york networks are like onions they stink.
History, importance, and future university of florida department of electrical and computer engineering bhavya daya abstract network security has become more important to personal computer users, organizations, and the military. Computer network for a company with remote branch offices. A computer network connects two or more devices together to share a. Exploitation of a valid computer session, to gain unauthorized access to information or services in a computer system. Challenges for the telephone network multimedia simultaneously transmit voicedatavideo over the network people seem to want it existing network cant handle it bandwidth requirements burstiness in traffic tsi cant skip input change in statistical behavior backward compatibility of new services backward compatibility of new services. A network can be defined as a group of computers and other devices connected in some ways so as to be able to exchange data. Brooksis currently the president of marcraft international corporation, located in kennewick, washington, and is in charge of research and development. Fig 1 gives an example of a network in a school comprising of a local area network or lan connecting computers with each other, the internet, and various servers. A clientserver network is one n which all available network. Ip is a standard that defines the manner in which the network layers of two hosts interact. I initially developed this material as a single weeks lecture in the si502networkedcomputingcourse that i taught at the university of michigan school of information starting in 2008. Basic concepts in computer networking usi informatics. A node is usually itself a computer general or special which runs specific network software. This computer networking pdf walks you through how to build a network that supports application diversity.
Session fixation attacker sets a users session id to one known to. This interconnection among computers facilitates information sharing among them. Data communication and computer network 1 a system of interconnected computers and computerized peripherals such as printers is called computer network. The network interface card address, called the hardware address, is protocolindependent and is usually assigned at the factory. A systems approach, fifth edition hopes to explain why networks are designed the way they are to help readers better understand how to build a network from the ground up. Generic term for objects, people who pose potential danger to assets via attacks threat agent. The purpose of this project was to design a network for a company with remote branch offices. Yes, no, they have layers shrek and donkey 1 introduction iso osi, ietf, and shrek standard when designing complex systems, such as a network, a common engineering approach. Specific object, person who poses such a danger by carrying out an attack ddos attacks are a threat if a hacker carries out a ddos attack, hes a threat agent. However, this book will focus on computer networksconnecting computers and having them communicate with each other. The physical topology of a network refers to the configuration of. This includes discussions of types of communication, many. An engineering approach to computer networking the. Because performing incident response effectively is a complex undertaking, establishing a successful incident response capability requires substantial planning and resources.
The telephone network is a typical circuitswitched network communication requires a connection setup phase in which the network reserves all the necessary resources for that connection links, bu. Ip addresses are 32 bit long, hierarchical addressing scheme. Reports from msi computer network for a company with remote branch offices desislav pavlov ivanov. In addition, a computer can even have more than one name associated with the same nic. All computer systems implement their protocols as part of the operating system. A web browsing software how many layers does osi reference model has. Local area network lan is based on client server network relationship. For courses in networking communications a motivates readers with a topdown, layered approach to computer networking unique among computer networking texts, the seventh edition of the popular computer networking. Migga kizza guide to computer network security third edition joseph migga kizza. In peer to peer network each computer can function as both client and server. Recommendations of the national institute of standards and technology. Principles, protocols and practice, release techniques allow to create pointtopoint links while radiobased techniques, depending on the directionality of the antennas, can be used to build networks containing devices spread over a small geographical area. Weakness or fault that can lead to an exposure threat.
Personal area network pan a personal area network pan is a computer network used for communication among computer devices, including telephones and personal digital assistants, in proximity to an individuals body. A survey of computer network topology and analysis examples brett meador, brett. Most of our discussion will assume that the key length is 128 bits. Peer to peer networks do not have a central control system. For each nic a given computer has, the computer would answer to a different name. Clientserver the computers are connected by a network, and there is a server present. The term network is used in a variety of contexts, including telephone, television, computer, or even people networks. A top down approach builds on the authoras long tradition of teaching this complex subject through a layered approach in a a. Protocol layering d needed because communication is complex d intended primarily for protocol designers. Network topologies describe the ways in which the elements of a network are mapped. Part i networking basics 3 chapter 1 what is a network. Definitions of physical and logical topologies are provided.
Wisconsin standards for computer science iv foreword computer science education introduces students to topics from programming to being creators of technology. It includes the type of cables and protocols used in order for one device to be able to communicate with the other. Data communication and computer network tutorialspoint. So messages between computers can be short, medium, or long. A computer can be connected to more than one network, as is the case with. A central computer, or server, acts as the storage location for files and applications shared on the network. Discrete algorithms and discrete modeling algorithmic and discrete aspects in the context of computer networking as well as mobile and wireless computing and communications.
A computer network consists of a collection of computers, printers and other equipment that is connected together so that they can communicate with each other. Network which uses shared media has high probability of. Fundamentals of computer networking and internetworking. With regard to using a key length other than 128 bits. A link refers to the connectivity between two devices. Computer networks pdf notes free download cn notes. A network refers to two or more connected computers that can share resources such as data, a printer, an internet connection, applications. A node can be a computer, printer, or any other device capable of sending andor receiving data generated by other nodes on the network. The second reason is that the computer networking community is a strong. Raj jain download abstract this paper presents an introduction to computer network topology. Overview of computer networks university of california, davis. The maximum data transfer rate of a network or internet connection 2. A client is the computer running a program that requests the service from a server.
Network topologies michigan technological university. A node can be a computer, printer, or any other device capable of. Data communication and computer network 8 let us go through various lan technologies in brief. Computer communications and networks joseph migga kizza guide to.
Job ready assessments measure technical skills at the occupational level and include items which gauge factual and theoretical knowledge. A survey of computer network topology and analysis examples. Messages on ccis conform to signaling system 7 ss7 spec. The computer networking fundamentals industrybased credential is included in noctis job ready assessment battery. Threats and attacks computer science and engineering. This module will enable the students to understand the basic concept of computer networks,the different types of computer networkscommunication and configuration of different network devices. Using a common language for computer security incident information john d. Multiple choice questions of computer networking 11 computer network is a. Goals of course develop a strong understanding of network technologies from the physical to application layer design choices strengths and weaknesses get a feel of networking research develop healthy critical eye. The nodes typically handle the network protocols and provide switching capabilities.
Computer security division information technology laboratory national institute of standards and technology gaithersburg, md. Network topologies topology physical and logical network layout physical actual layout of the computer cables and other network devices logical the way in which the network appears to the devices that use it. The devices may or may not belong to the person in question. This address is technically called the media access control address mac because it is found on the mac sub layer of the data link layer. An engineering approach to computer networking the telephone. Logical addressing, internetworking, tunneling, address mapping, icmp, igmp, forwarding, unicast routing protocols, multicast routing protocols. However, although the number of hosts attached to the internet is high, it should be compared to the number of mobile phones that are in use today. Students engaged in computer science education find relevance, application, and understanding of the core subjects to prepare them for college and careers in the 21 st century. Ransom attacks malware encrypts hard drives, or ddos attack social network attackssocial network attacks users trust in online friends makes these networks a prime target.
A top down approach builds on the authoras long tradition. Local area networklan is based on client server network relationship. Peer to peer network is useful for a small network containing less than 10 computers on a single lan. This includes discussions of types of communication, many networking standards, popular protocols, venues where net. Cloud computing growing use will make this a prime target for attack. The picture of grace hopper in chapter 3 is from the computer history museum. A network is a set of devices often referred to as nodes connected by communication links. Peer to peer workgroups the computers are connected by a network, however, there is not a server present. Overview of computer networks university of california. Ethernet ethernet is a widely deployed lan technology. The operating systems exports the network functionality as a network application programming interface api. United states computer emergency readiness team national cyber security.
Theft of a magic cookie used to authenticate a user to a remote server for web developers four methods. The author has interest in network architectures and wished to gain improved knowledge of remote networks. This technology was invented by bob metcalfe and d. Computers may connect to each other by either wired or wireless media. Computer security incident response has become an important component of information technology it programs. Computers sometimes send mediumsized information like a single picture or a long email message. Signaling network switch controllers are special purpose computers linked by their own internal computer network common channel interoffice signaling ccis network earlier design used inband tones, but was severely hacked also was very rigid why. If a virus is detected, the computer will display a warning asking what action should be taken, often giving the options to remove, ignore, or move the file bandwidth 1. Pdf format is a file format developed by adobe in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. Based on the postscript language, each pdf file encapsulates a complete description of a fixedlayout flat document, including the text, fonts.
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