UNIT - I Data Communications : Components - Direction of Data flow - Networks - Components and Categories - Types of Connections - Topologies -Protocols and Standards - ISO / OSI model, Example Networks such as ATM, Frame Relay, ISDN Physical layer : Transmission modes, Multiplexing, Transmission Media, Switching, Circuit Switched Networks, Datagram Networks, Virtual Circuit Networks. (Chapter - 1) UNIT - II Data link layer : Introduction, Framing, and Error - Detection and Correction - Parity - LRC - CRC Hamming code, Flow and Error Control, Noiseless Channels, Noisy Channels, HDLC, Point to Point Protocols. 111 Medium Access sub layer : ALOHA, CSMA/CD, LAN - Ethernet IEEE 802.3, IEEE 802.5 - IEEE 802.11, Random access, Controlled access, Channelization. (Chapter - 2) UNIT - III Network layer : Logical Addressing, Internetworking, Tunneling, Address mapping, ICMP, IGMP, Forwarding, Uni-Cast Routing Protocols, Multicast Routing Protocols. (Chapter - 3) UNIT - IV Transport Layer : Process to Process Delivery, UDP and TCP protocols, Data Traffic, Congestion, Congestion Control, QoS, Integrated Services, Differentiated Services, QoS in Switched Networks. (Chapter - 4) UNIT - V Application Layer : Domain name space, DNS in internet, electronic mail, SMTP, FTP, WWW, HTTP, SNMP. (Chapter - 5)
