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Computer network

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maruthi vardhan
maruthi vardhan

The document discusses computer networks and networking concepts. It introduces the advantages of computer networks like ease of use without distance limitations and increased mobility. It then covers networking topics like the OSI model layers, network devices, TCP/IP, network security, and programming. It also lists some common network administration responsibilities and skills needed to work in the field.

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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 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 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
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
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 detection (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 Wire Wireless
Router, Switch, Hub, Modem,
TCP/IP
TCP/IP
Network Security Firewall
Operating Systems
油
Hacking NOT cracking
Programming /* ** server.c -- a stream socket server demo */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <sys/wait.h> #include <signal.h> #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(&quot;socket&quot;); exit(1); } if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) { perror(&quot;setsockopt&quot;); 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), '', 8); // zero the rest of the struct if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) { perror(&quot;bind&quot;); exit(1); } if (listen(sockfd, BACKLOG) == -1) { perror(&quot;listen&quot;); 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(&quot;sigaction&quot;); 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(&quot;accept&quot;); continue; } printf(&quot;server: got connection from %s&quot;, 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, &quot;Hello, world!&quot;, 14, 0) == -1) perror(&quot;send&quot;); close(new_fd); exit(0); } close(new_fd); // parent doesn't need this } return 0; }
Server - Client
Certificate
Network topics IPv6 Mobile-IP MPLS Network Security, VPN, IPSec Quality of Service VoIP Wireless Web-base application Encryption Decryption Streaming
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
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Computer network

  • 2. Why Computer Network ??? Stand alone Computer . FOR WHAT ???
  • 3. Something interesting from Computer Network ??? Easiness No distance Mobility Efficient
  • 4. Network Administrator, Advantages Good salary Control other peoples Faster than others Relax Disadvantages ERROR , then people want to kill YOU !!!
  • 5. Study Basic network theory OSI Layer Network devices Routing Network security Programming
  • 6. Study Network Skill Operating system Server Client Router, Switch, Cabling, etc (network devices) Hacking not Cracking Certificate Experience Time can answer ???
  • 7. 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. 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. OSI Model Layers Transport Layer Provides reliable delivery Performs error detection Includes end to end connection Network Layer Provides logical addressing Routing layer
  • 10. 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. Keys Layers of the OSI Model
  • 12. OSI Model and Protocols
  • 19. 油
  • 20. Hacking NOT cracking
  • 21. Programming /* ** server.c -- a stream socket server demo */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <sys/wait.h> #include <signal.h> #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(&quot;socket&quot;); exit(1); } if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) { perror(&quot;setsockopt&quot;); 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), '', 8); // zero the rest of the struct if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) { perror(&quot;bind&quot;); exit(1); } if (listen(sockfd, BACKLOG) == -1) { perror(&quot;listen&quot;); 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(&quot;sigaction&quot;); 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(&quot;accept&quot;); continue; } printf(&quot;server: got connection from %s&quot;, 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, &quot;Hello, world!&quot;, 14, 0) == -1) perror(&quot;send&quot;); close(new_fd); exit(0); } close(new_fd); // parent doesn't need this } return 0; }
  • 24. Network topics IPv6 Mobile-IP MPLS Network Security, VPN, IPSec Quality of Service VoIP Wireless Web-base application Encryption Decryption Streaming
  • 25. 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