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Computer Networks - MAC Layer - Example DLL Protocols 1...

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Example DLL Protocols 1. High-Level Data Link Control (HDLC). 2. Point-to-Point Protocol (PPP).
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HDLC Flag Identifies host. ACK, seq. # CRC
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PPP Internet’s DLL. Router-to-router. Home user-to-ISP. RFC 1661, etc. PPP is a multi-protocol framing mechanism that can be used over multiple PHYs (dial- up, dedicated point-to-point connections).
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Why MAC? Point-to-point versus shared-medium networks. Shared-medium networks use “broadcast” channels. multi-access or random access channels. MAC layer protocols regulate access to medium in shared-medium networks.
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MAC and LANs LANs typically use shared-medium. Examples? MAC layer critical! BTW, in wireless networks also! WANs typically use point-to-point connections
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Channel Allocation Problem How to allocate single shared, broadcast channel among several stations/users. If no arbitration, several stations/users may transmit at the same time: COLLISIONS!
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MAC Protocols Contention-based ALOHA and Slotted ALOHA.
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