• Computer networks can transmit data by two methods-
A. Broadcast links
B. Point-to-point
A. Broadcast networks
Broadcast network uses single communication channel that is shared by many stations. The data to be transmitted is converted in small packet form. Each packet contains address field of the destination station. It is also possible to send same packets to all stations within a network, it is called as broadcasting. When data packets are sent to a specific group of stations it is called as multicasting. In multicasting data is sent to selected group of stations. Multicasting is a selective process.
B. Point –to- point networks
• Point-to-point networks provides a dedicated link between any two stations the data packets are sent from source station to the destination station. Such a transmission is called unicasting.
• Networks can also be categorised depending on their physical size. Major categories of computer networks are-
1) Local Area Networks (LAN)
2) Metropolitan Area Networks (MAN)
3) Wide Area Network (WAN)
No comments:
Post a Comment