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Pertemuan 01Teknologi Jaringan

Matakuliah : H0242 / Keamanan Jaringan

Tahun : 2006

Versi : 1

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Learning Outcomes

Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu :

• Mahasiswa dapat menjelaskan komponen dan protokol jaringan TCP/IP

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Outline Materi

• OSI dan TCP/IP Model• IP, UDP dan TCP• Komponen Jaringan

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Data Networks

• Data networking solutions– Local-area networks–Wide-area networks

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Networking Devices

Equipment that connects directly to a network segment is referred to as a device.

These devices are broken up into two classifications. The first classification is end-user devices.

The second classification is network devices.

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Network Protocols

• Protocol suites are collections of protocols that enable network communication from one host through the network to another host.

• A protocol is a formal description of a set of rules and conventions that govern a particular aspect of how devices on a network communicate.

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WAN Technologies

• Analog modems• Integrated Services Digital Network (ISDN)• Digital Subscriber Line (DSL)• Frame Relay• Asynchronous Transfer Mode (ATM)• E carrier series: E1, E3• Synchronous Digital Hierarchy (SDH)

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Intranets and Extranets

• Intranets are designed to permit access by users who have access privileges to the internal LAN of the organization.

• Extranets refer to applications and services that are Intranet based, but that use extended, secure access to external users or enterprises.

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OSI Reference Model

• The application (upper) layers– Layer 7: Application– Layer 6: Presentation– Layer 5: Session

• The data-flow (lower) layers– Layer 4: Transport– Layer 3: Network– Layer 2: Data link– Layer 1: Physical

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Layers with Functions

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The Purpose of OSI Model

• It breaks network communication into smaller, simpler parts that are easier to develop.

• It facilitates standardization of network components to allow multiple-vendor development and support.

• It allows different types of network hardware and software to communicate with each other.

• It prevents changes in one layer from affecting the other layers so that they can develop more quickly.

• It breaks network communication into smaller parts to make learning it easier to understand.

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Peer-to-Peer Communication

• For data to travel from the source to the destination, each layer of the OSI model at the source must communicate with its peer layer at the destination.

• During this process, the protocols of each layer exchange information, called protocol data units (PDUs), between peer layers.

• Each layer of communication on the source computer communicates with a layer-specific PDU, and with its peer layer on the destination computer.

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The TCP/IP Reference Model

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TCP/IP Protocol

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Applications

• FTP – File Transfer Protocol• HTTP – Hypertext Transfer Protocol• SMTP – Simple Mail Transfer Protocol• DNS – Domain Name System• TFTP– Trivial File Transfer Protocol

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OSI Model and TCP/IP Model

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Data at Each Layer