Computer Network

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Computer Network

• Sritrusta Sukaridhoto

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Why Computer Network ???

• Stand alone Computer .
• FOR WHAT ???

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Something interesting from Computer Network ???

• Easiness
• No distance
• Mobility
• Efficient

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Network Administrator,

• Advantages
• Good salary
• Control other peoples
• Faster than others
• Relax

• Disadvantages
• ERROR, then people want to kill YOU !!!

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Study

• Basic network theory
• OSI Layer
• Network devices
• Routing
• Network security
• Programming

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Study

• Network Skill
• Operating system
• Server Client
• Router, Switch, Cabling, etc (network devices)
• Hacking not Cracking
• Certificate
• Experience
• Time can answer ???

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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

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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

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OSI Model Layers

• Transport Layer
• Provides reliable delivery
• Performs error detection
• Includes end to end connection
• Network Layer
• Provides logical addressing
• Routing layer

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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

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Keys Layers of the OSI Model
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OSI Model and Protocols
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Network Devices

• Wire

• Wireless

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Router, Switch, Hub, Modem,
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TCP/IP
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TCP/IP
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Network Security

• Firewall

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Operating Systems
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(No Transcript)
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Hacking NOT cracking
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Programming

• if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEA
  DDR,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)

• /
• server.c -- a stream socket server demo
• /
• include ltstdio.hgt
• include ltstdlib.hgt
• include ltunistd.hgt
• include lterrno.hgt
• include ltstring.hgt
• include ltsys/types.hgt
• include ltsys/socket.hgt
• include ltnetinet/in.hgt
• include ltarpa/inet.hgt
• include ltsys/wait.hgt
• include ltsignal.hgt
• 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) gt 0)

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Server - Client
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Certificate
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Network topics

• IPv6
• Mobile-IP
• MPLS
• Network Security, VPN, IPSec
• Quality of Service
• VoIP
• Wireless
• Web-base application
• Encryption Decryption
• Streaming

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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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• Thank You