1. Computer Network Sritrusta Sukaridhoto

2. Computer Network – Sritrusta Sukaridhoto Why Computer Network ??? Stand alone Computer …. FOR WHAT ???

3. Computer Network – Sritrusta Sukaridhoto Something interesting from Computer Network ??? Easiness No distance Mobility Efficient

4. Computer Network – Sritrusta Sukaridhoto Network Administrator,… Advantages  Good salary  Control other peoples  Faster than others  Relax Disadvantages  ERROR, then people want to kill YOU !!!

5. Computer Network – Sritrusta Sukaridhoto Study… Basic network theory  OSI Layer  Network devices  Routing  Network security  Programming

6. Computer Network – Sritrusta Sukaridhoto Study… Network Skill  Operating system  Server – Client  Router, Switch, Cabling, etc (network devices)  Hacking not Cracking  Certificate Experience  Time can answer ???

7. Computer Network – Sritrusta Sukaridhoto Open System Interconnection (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 information flow across the interfaces

8. Computer Network – Sritrusta Sukaridhoto 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 different applications data separate

9. Computer Network – Sritrusta Sukaridhoto OSI Model Layers Transport Layer  Provides reliable delivery  Performs error detection  Includes end to end connection Network Layer  Provides logical addressing  Routing layer

10. Computer Network – Sritrusta Sukaridhoto OSI Model Layers Data Link Layer  Combines packets into bytes then into frames  Performs error detection (not correction)  Provides Media access addressing (point-to- point)  Media Access Control and Data Link Control Physical Layer  Moves bits between devices

11. Computer Network – Sritrusta Sukaridhoto Keys Layers of the OSI Model

12. Computer Network – Sritrusta Sukaridhoto OSI Model and Protocols

13. Computer Network – Sritrusta Sukaridhoto Network Devices Wire Wireless

14. Computer Network – Sritrusta Sukaridhoto Router, Switch, Hub, Modem, …

15. Computer Network – Sritrusta Sukaridhoto TCP/IP

16. Computer Network – Sritrusta Sukaridhoto TCP/IP

17. Computer Network – Sritrusta Sukaridhoto Network Security Firewall

18. Computer Network – Sritrusta Sukaridhoto Operating Systems

19. Computer Network – Sritrusta Sukaridhoto

20. Hacking NOT cracking

21. Computer Network – Sritrusta Sukaridhoto Programming /* ** server.c -- a stream socket server demo */ #include #define MYPORT 3490 // the port users will be connecting to #define BACKLOG 10 // how many pending 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; // connector's 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,&yes,sizeof(int)) == -1) { perror("setsockopt"); exit(1); } my_addr.sin_family = AF_INET; // host byte order my_addr.sin_port = htons(MYPORT); // short, network byte order my_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP memset(&(my_addr.sin_zero), '\0', 8); // zero the rest of the struct if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) { perror("bind"); exit(1); } if (listen(sockfd, BACKLOG) == -1) { perror("listen"); exit(1); } sa.sa_handler = sigchld_handler; // reap all dead processes sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; if (sigaction(SIGCHLD, &sa, NULL) == -1) { perror("sigaction"); exit(1); } while(1) { // main accept() loop sin_size = sizeof(struct sockaddr_in); if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) { perror("accept"); continue; } printf("server: got connection from %s\n", inet_ntoa(their_addr.sin_addr)); if (!fork()) { // this is the child process close(sockfd); // child doesn't need the listener if (send(new_fd, "Hello, world!\n", 14, 0) == -1) perror("send"); close(new_fd); exit(0); } close(new_fd); // parent doesn't need this } return 0; }

22. Computer Network – Sritrusta Sukaridhoto Server - Client

23. Computer Network – Sritrusta Sukaridhoto Certificate

24. Computer Network – Sritrusta Sukaridhoto Network topics IPv6 Mobile-IP MPLS Network Security, VPN, IPSec Quality of Service VoIP Wireless Web-base application Encryption Decryption Streaming

25. Computer Network – Sritrusta Sukaridhoto EEPIS Computer Network Lab Jaringan Komputer  Ka. Lab: Sritrusta Sukaridhoto  Gedung D4 lt. 3 UPT Jaringan Komputer  Ka. UPT: Dadet P  Network Admin: Sukaridhoto, Hendri, Firman, Reza  Gedung IT lt. 2

26. Computer Network – Sritrusta Sukaridhoto Thank You…