Computer Network

1、Computer Network,Sritrusta Sukaridhoto,Why Computer Network ?,Stand alone Computer . FOR WHAT ?,Something interesting from Computer Network ?,Easiness No distance Mobility Efficient,Network Administrator,Advantages Good salary Control other peoples Faster than others Relax,Disadvantages ERROR, then

2、people want to kill YOU !,Study,Basic network theory OSI Layer Network devices Routing Network security Programming,Study,Network Skill Operating system Server Client Router, Switch, Cabling, etc (network devices) Hacking not Cracking Certificate Experience Time can answer ?,Open System Interconnect

3、ion (OSI),A model defines the stages or tasks of a protocol as it prepares to send data Open meaning standards available to all. The model is devided into seven distinct layers Each subsequent layer should perform a well-defined function and the layer boundaries are designed to minimize the informat

4、ion flow across the interfaces,OSI Model Layers,Application Layer Provides a user interface (examples: HTTP, SMTP) Includes file, print, database, app. Services Presentation Layer Presents the data (example: JPEG) Includes encryption, compression and translation services Session Layer Keeps differen

5、t applications data separate,OSI Model Layers,Transport Layer Provides reliable delivery Performs error detection Includes end to end connection Network Layer Provides logical addressing Routing layer,OSI Model Layers,Data Link Layer Combines packets into bytes then into frames Performs error detect

6、ion (not correction) Provides Media access addressing (point-to-point) Media Access Control and Data Link Control Physical Layer Moves bits between devices,Keys Layers of the OSI Model,OSI Model and Protocols,Network Devices,Wired,Wireless,Router, Switch, Hub, Modem, ,TCP/IP,TCP/IP,Operating Systems

7、,Network Security,Firewall,Hacking NOT cracking,Programming,/* * server.c - a stream socket server demo */ #include #include #include #include #include #include #include #include #include #include #include #define MYPORT 3490 / the port users will be connecting to #define BACKLOG 10 / how many pendi

8、ng connections queue will hold void sigchld_handler(int s) while(wait(NULL) 0); int main(void) int sockfd, new_fd; / listen on sock_fd, new connection on new_fd struct sockaddr_in my_addr; / my address information struct sockaddr_in their_addr; / connectors address information int sin_size; struct sigaction sa; int yes=1; if (sockfd = socket(AF_INET, SOCK_STREAM, 0) = -1) perror(socket); exit(1);, if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR, ,Server - Client,Certificate,EEPIS Computer Network,Lab Jaringan Komputer Ka. Lab: Sritrusta Sukaridho