Computer Network

UNIT V: The Transport Layer: Transport layer protocols: Introduction, services, port number, User data gram protocol, User datagram, UDP services, UDP applications, Transmission control protocol: TCP services, TCP features, Segment, A TCP connection, windows in TCP, flow control, Error control, Congestion control in TCP. Application Layer: World Wide Web: HTTP, Electronic mail, Architecture, web based mail, email security, TELENET, local versus remote Logging, Domain Name System: Name Space, DNS in Internet,Resolution, Caching, Resource Records, DNS messages, Registrars, security of DNS Name Servers, SNMP.