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Midterm Review 1 Introduction –Basic terminology and concepts. Physical Layer –Time and frequency domains. –Bandwidth and data rate. –Analog and digital transmission. –Simplex, half-duplex and full-duplex transmission.
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Midterm Review 2 Physical Layer (cont’d) –Transmission impairments. –Decibel. –S/N ratio. –Channel capacity. Nyquist. Shannon. –Types / properties / advantages / disadvantages of media Copper (UTP: Cat-3, Cat-5) Fiber.
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Midterm Review 3 Physical Layer (cont’d) –Data encoding Analog-to-digital. –(Time sampling / amplitude quantization) Digital-to-analog. –(Data reconstruction) –Transmission modes. Synchronous. Asynchronous.
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Midterm Review 4 Data Link Layer (Error & Flow Control) –Framing –Error detection / correction schemes. –Parity. –Hamming distance –CRC (polynomial encoding) Flow control.
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Midterm Review 5 –Flow Control –Acknowledgement –Stop and Wait –PAR / ARQ –Sliding Window –Piggybacking –“go back n” –Pipelining –Selective repeat
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Bit Length of a Link Assume link is fully occupied 1 st bit is just arriving at the receiver sender has sent continuously R = data rate (bps) d = distance (length of link) (meters) V = propagation velocity (meters / second) (~ 2 - 3 x 10 8 meters/second) Bit length = Rd / V bits
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Midterm Review 6 –DLL / MAC protocols Static Dynamic –Multiplexing. Frequency-Division Multiplexing (FDM). Time-Division Multiplexing (TDM). Statistical Time-Division Multiplexing (STDM).
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Midterm Review 7 LANs –Protocol architecture. –Ethernet (802.3) design parameters (length, frame size) standards / reasons –Frame format (not details) –LAN topologies.
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Midterm Review 8 MAC –Centralized and distributed control. –Synchronous and asynchronous. –Asynchronous MAC. Round-robin, reservation, and contention. LLC for LANs.
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Midterm Review 9 MAC protocols. –Contention. ALOHA and Slotted ALOHA. CSMA. CSMA/CD. –Token Passing Token bus. Token ring.
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Midterm Review 10 Ethernet –Cabling –Manchester encoding –Backoff –Switched –Performance / speed / length High-Speed LANs –FDDI –Fast Ethernet –Gigabit Ethernet
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Midterm Review 11 Wireless LANs –Hidden station problem –MACA / MACAW –RTS / CTS –Frames / Fragments
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Midterm Review 12 LAN interconnection –Interconnection schemes and devices. –Bridges –VLAN Routing with bridges / transparent bridges –Fixed routing. –Spanning tree –Source routing –Route discovery –Address learning –Backward learning
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Encapsulation Application data header TCP IP LLC MAC trailer TCP segment IP datagram LLC PDU MAC frame
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Summary Channel allocation methods and systems for a common channel. X X X
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