Computer Architecture and Organization MCQs | Page - 1

 an overlay network is a computer network that is built on top of another network. some examples of an overlay network are virtual private networks (vpn) and peer-to-peer networks (p2p).

 a router is a networking device that forwards data packets between computer networks. routers perform the traffic directing functions on the internet. they make use of routing protocols like rip to find the cheapest path to the destination.

 a virtual private network extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.vpn provides enhanced security and online anonymity to users on the internet. it is also used to unblock websites which are unavailable in certain regions.

 in star topology, no computer is connected to another computer directly but all the computers are connected to a central hub. every message sent from a source computer goes through the hub and the hub then forwards the message only to the intended destination computer.

 in bus topology, there is a single cable to which all the network nodes are connected. so whenever a node tries to

 wan is the abbreviation for wide area network. this network extends

 fdm is an abbreviation for frequency division multiplexing. this technique is used when the bandwidth of the channel is greater than the combined bandwidth of all the signals which are to be transmitted. the channel is active at all times unless a collision occurs with another channel trying to use the same frequency. some other multiplexing techniques are time division multiplexing and phase division multiplexing.

 isps exchange internet traffic between their networks by using internet exchange points. isps and cdns are connected to each other at these physical locations are they help them provide better service to their customers.

 http is used to browse all the websites on the world wide web, dhcp is used to allot ips automatically to the users on the internet, and dns is used to connect the users to the host servers on the internet based on the domain name.

 physical theft of data is an example of physical layer vulnerability. other such issues are unauthorized network access, damage or destruction of data & hardware and keystroke & other input logging.