CS335 Networking & Network Administration Tuesday April 27, 2010

Summary Basic networking Hardware in LAN and WAN’s Addressing and routing

Internetworking No single networking technology is best for all needs Universal service Allows arbitrary pairs of computers to communicate Incompatibilities among network hardware and physical addressing prevent connecting bridged networks with arbitrary technologies Internetworking provides universal service among heterogeneous networks

Physical network connections with routers Routers have a processor and memory Have separate I/O interfaces for each network to which it connects

Internet architecture One router could connect these networks Routers can have multiple interfaces Redundancy improves reliability

Achieving universal service Goal of internetworking is universal service across heterogeneous networks Internet protocols make this possible It is a virtual network made up of many small networks The communication system is an abstraction

TCP/IP internet protocols Compare this to 7 layer OSI model

IP Internet Protocol Addresses

Dotted decimal

Address classes

Special IP Addresses Reserved, not assigned

Example

CIDR CIDR (Classless Inter-domain Routing)

Domain Registry