Data Communication and Computer Network

Features of Network Open System Interconnection Model

Physical Layer Analog and Digital Analog Signals Digital Signals Analog versus Digital Data Rate Limits Transmission Impairment More about signals

Digital Transmission Line coding Block coding Sampling Transmission mode

Analog Transmission Modulation of Digital Data Telephone modems modulation of Analog signals Multiplexing FDM WDM TDM

Transmission Media Guided Media Unguided media wireless r nCircuit switching and Telephone Network Circuit switching Telephone network

Error Detection and correction Types of Errors Detection Error Correction Data Link Control and Protocols Flow and Error Control Stop-and-wait ARQ Go-Back-N ARQ Selective Repeat ARQ HDLC

Point-to Point Access PPP Point-to-Point Protocol PPP Stack Multiple Access Random Access Controlled Access Channelization

Application Layer Client Server Model Socket Interface Domain Name System DNS Electronic Mail r n SMTP and file transfer FTP HTTP and WWW

Host to Host Delivery Internetworking addressing and Routing r nNetwork Layer Protocols ARP IPV4 ICMP IPV6 ad ICMPV6 r nTransport Layer Process to Process Delivery UDP TCP congestion control and Quality of service