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Why is networking important? : Why is networking important? • Information and communication are two of the most important strategic issues for the success of every enterprise. • While today nearly every organization uses a substantial number of computers and communication tools . • To overcome these obstacles in an effective usage of information technology, computer networks are necessary .. Classification of computer networking : Classification of computer networking • Network in small geographical Area (Room, Building or a Campus) is called LAN (Local Area Network) . • Network in a City is call MAN (Metropolitan AreaNetwork) . • Network spread geographically (Country or across Globe) is called WAN (Wide Area Network) . OSI model : OSI model • OSI stands for open system interconnection reference model. • The OSI model describe how information or data flow from one computer to another by dividing with whole process into such smaller & manageable section or layer. • Each layer perform a well define function & provide service to layer above or below it. OSI model layers : OSI model layers Basic terminologies in computer networking : Basic terminologies in computer networking • CLIENT & SERVER • TCP IP ADDRESSING • DNS (DOMAIN NAME SERVER) • FTP(FILE TRANSFER PROTOCOL) • NETWORK SECURITY CLIENT & SERVER : CLIENT & SERVER • A network server is a computer designed to process requests and deliver data to other (client) computers over a local network or the Internet. • The client–server model of computing is a distributed application structure that partitions tasks or workloads between the providers of a resource or service, called servers, and service requesters, called clients. TCP/IP ADDRESSING : TCP/IP ADDRESSING IP address space is divided into mainly three different classes:- Class A 1 – 127 Class B 128 - 191 Class C 192 – 223 Private network Addresses :- Class A 10.0.0.0 - 10.255.255.255 Class B 172.16.0.0 - 172.31.255.255 Class C 192.168.0.0 - 192.168.255.255 TCP-IP ADDRESSING : TCP-IP ADDRESSING DNS SERVER : DNS SERVER It basically resolves the IP-Addressses Whats actually a DNS is? : Whats actually a DNS is? DNS SERVER : DNS SERVER FTP : FTP • FTP is File Transfer Protocol . • It works on application layer of OSI Model . • FTP is used to transfer files from a client Window machine to Linux server machine . • In most of the cases we use FILEZILLA software for file transfering. • FILEZILLA is the most convnient software used for uploading files from client to server. FTP USING FILE-ZILLA : FTP USING FILE-ZILLA Logging into LINUX server : Logging into LINUX server NETWORK SECURITY : NETWORK SECURITY • We all are looking for a secure networking . • Linux is the most secure operating system. • Therefore , most of the severs are using Linux operating system. • Hacking and Cracking are the two main terms related with network security. • Hacking refers to the re-configuring or re-programming of a system to function in ways not facilitated by the owner, administrator, or designer. HACKERS & CRACKERS : HACKERS & CRACKERS • A hacker is a person who is proficient with computers and/or programming to an elite level where they know all of the in's and out's of a system. • There is NO illegality involved with being a hacker. • A cracker is a hacker who uses their proficiency for personal gains outside of the law. • EX: stealing data, changing bank accounts, distributing viruses etc. • What the hacker does with their knowledge of systems within the definition of the law is what defines them as a hacker vs a cracker. It's then safe to say that all crackers are hackers, but not all hackers are crackers. • This is an important distinction. Thank YouAny queries? : Thank YouAny queries? You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.