Basic Computer Network

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Presentation transcript:

Basic Computer Network

Connection Types LAN WLAN Dial-up Services Broadband Services WAN

LAN (Local Area Network) A network of computers that are in the same physical location, such as home or building Usually connected using Ethernet A standard on how computers communicate over a shared media (cable) Old: BNC connector for coaxial cable New: RJ45 for twisted pair cable http://en.wikipedia.org/wiki/Image:BNC_connector.jpg http://en.wikipedia.org/wiki/Image:Ethernet_RJ45_connector_p1160054.jpg

WLAN (Wireless LAN) Wi-Fi (Wireless Fidelity) Access Point (AP) A wireless technology that connects computers without cables Access Point (AP) A device (base station) that connects wireless devices together Usually connected to a wired-network ESSID (Extended Service Set ID) A “name” for the AP, eg. mobilenet Hotspot The area covered by wireless access points

Dial-up Services ISDN Integrated Services Digital Network 2 data channel (56K each) 1 voice channel

WAN (Wide Area Network) A LAN spans a large geographic area, such as connections between cities Usually connected using leased line T1 (1.5Mbps) T3 (45Mbps) OC3 (155Mbps) OC12 (622Mbps) OC48 (2.4Gbps) Telecommunication lines Fiber optic lines

Hub/Switch/Router To connect multiple segments of networks into a larger one Hub A multiport repeater to enhance signal within the same LAN Switch Like hub but with intelligent Better performance Router Forward packets from one LAN to another

Intranet vs. Internet Intranet Internet Both are using TCP/IP A private network that is contained within an enterprise Could be LANs and WANs Internet A public network of networks Both are using TCP/IP

TCP/IP A family of protocols that makes the Internet works The Robustness Principle “Be liberal in what you accept, and conservative in what you send” - Jon Postel

Packets A small chunk of data transmitted over the Internet Alice Bob

VPN (Virtual Private Network) A secure tunnel to a private network through a public network Once established, local node appears to be a node in the private network in a secure manner Correction from the book (pg. 11): VPN does not mean using telephone line connection!!!

Host & IP Address Correction from the book: “A host is a computer connected directly to the Internet” “You home computer is not a host” Each host needs an IP address IP address A 32-bit number, arranged in 4 numbers seperated by “.” Eg. 74.125.19.147