Presentation on theme: "Data Link Layer - Ethernet Pertemuan 14 Matakuliah: H0484/Jaringan Komputer Tahun: 2007."— Presentation transcript:
Data Link Layer - Ethernet Pertemuan 14 Matakuliah: H0484/Jaringan Komputer Tahun: 2007
Bina Nusantara Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Menggunakan Ethernet
Bina Nusantara Outline Materi Standards Frame format
Bina Nusantara Frame Structure In synchronous transmission all transmissions are in frames Single frame format for all data and control exchanges Basic Structures: – Character Oriented Protocol (COP) - BSC (Bisynchronous) – Bit Oriented Protocol (BOP) - HDLC, SDLC
Bina Nusantara Logical Link Control Interface to higher levels Flow and error control Transmission of link level PDUs between two stations Must support multiaccess, shared medium Relieved of some link access details by MAC layer Addressing involves specifying source and destination LLC users – Referred to as service access points (SAP) – Typically higher level protocol
Bina Nusantara MAC Frame Format MAC control Destination MAC address Source MAC address LLC – MAC layer receives data from LLC layer CRC – MAC layer detects errors and discards frames LLC optionally retransmits unsuccessful frames
Bina Nusantara Media Access Control Assembly of data into frame with address and error detection fields Disassembly of frame – Address recognition – Error detection Govern access to transmission medium – Not found in traditional layer 2 data link control For the same LLC, several MAC options may be available
Bina Nusantara Media Access Control (MAC) Shared-media broadcast technology. Ethernet’s MAC performs three functions: Transmitting and receiving data packets Decoding data packets and checking them for valid addresses before passing them to the upper layers of the OSI model Detecting errors within data packets or on the network Specified by the technology being used. Dictates who can transmit and when (Only one station may transmit at a time; otherwise, their signals would be scrambled) Two types: Deterministic (Token Ring) Opportunistic (First come, first served - Ethernet)
Bina Nusantara Ethernet and IEEE 802.3 Specify similar technologies. Broadcast network. Using CSMA/CD algorithm. Hardware implementation. Differences: – Ethernet provides services corresponding to physical and datalink layer. – IEEE 802.3 specifies the physical layer and the channel-access portion of the data link layer but does not define a LLC protocol.
Bina Nusantara Protocol stack Link Control Protocol (LCP) Authentication Protocols Network Control Protocol (NCP) Bit Padding Digital Signals (DS) Services
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