Presentation7.pptx
- 1. Computer Network is a network in which multiple computers are connected to other to share information and resources. In today’s era , people in one part of the world can communicate with those in the other corner of the world. All this is possible because of the technological advancements in communication systems.
- 2. Easy data sharing Easy access to data Cost effectiveness Fault tolerance Quality of service Security No need to keep hard copies of documents
- 3. A router is a communication device that is used to connect two logically and physically different networks. Router uses the IP address. Network Interface Unit (NIC or NIU) is a device that allows communication of computer system over the network. Hub is a hardware device that connects multiple computers or other networks or other network devices together.
- 4. Switches are small hubs that send data directly to the destination rather than every part within network. A switch is smarter device than hub. A repeater is a device that boosts the signal being transmitted on the network. The full form of MODEM is Modulator Demodulator. It is a hardware device that allows a computer to send and receive information over telephone lines.
- 5. Communication channel is a medium through which data is transmitted from one location to another. Wired or guided media Wireless or unguided media
- 6. It covers a small physical area like a home, office or small group of buildings, such as a school or airport.
- 7. MAN consists of a computer network across an entire city, college campus or small region. A MAN is larger than a LAN. WAN is a computer network that covers a large geographic area. The Internet is the best example of a WAN.
- 8. PAN is a computer network organized by an individual person within a single building. PAN are used for communication among various devices, such as telephones, personal digital assistants, fax machines and printers that are located close to a single user.
- 9. Network security is ensured in many ways. Two of the most common ways are as follows: Each authorized user is given a unique username and password for accessing the network. Different users are given different types of access rights, such as read only access, read- write access, and no access.