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Unit – I

Introduction: Data Communication, Network Protocols and Standards, Point to Point and Multi Point line configuration, Network Topologies: Mess, Star, Tree, Bus, Ring. Transmission Modes: Simplex, Half Duplex, Networks: LAN, MAN, WAN. The OSI Models: Function of Layers. TCP/ IP Protocol Suit.
Signals: Analog and Digital signals, Periodic and Aperiodic signal,
Encoding and Modulating: Digital to Digital conversion. Unipolar. Polar Bipolar, Analog to Digital conversion AM, FM, PM.

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Unit – II

Transmission of Digital data: Parallel and Serial transmission. DTE/DCE interface, Modems, Guided and Unguided transmission media. Transmission impairment, Performance.
Multiplexing: Frequency division, Wave division and Time division multiplexing, the Telephone system, Digital Subscriber Line (DSL), Error Detection and Correction: Types of Error, Redundancy Checks (VRC, LRC, CRC), Error Correction.

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Unit –III

Data Link Control: Line Discipline, Flow Control, Error Control
Data Link Protocol: Asynchronous and Synchronous Protocols, Character and Bit Oriented Protocols.
Local Area Networks: IEEE 802 standards, Ethernet, Token Bus, Token Ring, FDDl Switching: Circuit Switching, Packet Switching, Message Switching.

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Unit – IV

Integrated Services Digital Network (ISDN), Services, History, Subscribers access to ISDN, The ISDN layers, Broadband ISDN. X.25: X.25 Layers, Protocols related to X.25.
Frame Relay: Introduction, Frame Relay operation. Frame Relay layers, Congestion Control, Leaky bucket algorithm. Traffic control.

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Unit V

Networking and Internetworking Devices: Repeaters, Bridges, Routers, Gateways, Routing Algorithms.
TCP/IP Protocol Suite: Overview, Network Layer, Addressing Subneting, Transport Layer, Application Layer: Client Server Model, BOOTP, DHCP, DNS, Telnet, FTP, SMTP, SNMP, HTTP, WWW.

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