est_320_Lect_4_Networking_2_28_08

The internet has a global communications

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: y efficient Global Network data is not only send but it can be used throughout the global network. It operates using 5 OSI layers (Layer 3 7) to provide uses with higher level services. Network Links to the Internet Dial- up dedicated telephone line sends data at 56Kbps (kilobits per second) T1 thru T3 - leased telephone lines with carrying speeds from 1.544 Mbps to 44.746 Mpbs Cable Modems up to 30 Mbps DSL connections up to 10 Mbps Modem data, voice and video is changed Terms in Computer Networks analog/digital and digital/analog Modulation/demodulation. Routers A device that forwards packets from one network to another. Works at the first 3 OSI layers. Access point Central base station in a Wireless LAN Gateway A device that connects separate networks and the separate networks use different protocols. Ports The port number of the server in a URL. Terms in Computer Networks (cont.) Repeaters A device that regenerates a signal thereby extending the distance a signal can travel. Bridge Operates at the first two levels of the OSI model. The de...
View Full Document

Ask a homework question - tutors are online