Computer Networks

Computer communication predominantly uses serial transmission because it's more cost-effective over long distances and avoids synchronization issues that parallel transmission faces.

DDS (Digital Data Service) provides digital communication, while DDD and WATS are analog telephone services. DDT is not a communication service at all.

Modems are used to connect to wide area networks (WAN) or the internet through telephone lines, not for local area networks. LANs connect devices like computers, printers, and cables within a limited physical area like a building or campus.

WAN is a computer network that spans a relatively large geographical area.

Internet is a global system because it interconnects the networks worldwide.

SMDS is a connectionless service packet delivery service.

The simultaneous transmission of data to a number of stations is called broadcasting.

Roll of VCI tables is to map all the VCI & VPI of an incoming cell to output VCI.

It manages the bandwidth available on the serial link and hence, is often called bandwidth manager.

This technology is implemented at the lowest layers of a network.

In this technology, ordinary application programs deal directly with networking instead of indirectly with networking through application support.

This networking involves two or more separate networks operating as one combined network.

A gateway is a network node that connects two networks using different protocols or architectures. It acts as a 'gate' between the two networks, translating data so it can be understood by the destination network.

An inter-network (or internetwork) is formed by connecting multiple distinct computer networks together using gateways or routers. The most well-known example of an inter-network is the global Internet.

 Most networks are organized as a series of layers. At the lowest layer physical communication take place and at higher layer virtual communication happens.