1.3+Networks

=Networks=

//Before you begin//: Lessons are based on community-based, continually updated online sources such as [|Wikipedia]. Relevant terms for this lesson are listed under Topics and presented in a narrative format in the Read about sections. Click on each of the linked items and visit the Wikipedia article to get the most out of the lesson, and then hit the Back button on your browser to return to the lesson.

toc

=Goals=
 * Be familiar with common network architectures in the hospital environment
 * Understand the advantages and disadvantages of wired versus wireless networks
 * Distinguish markup languages from text formatting

=Topics= [|protocol], [|network] , [|bandwidth] , [|local area network] (LAN), [|network interface card] (NIC), [|ethernet] , [|network hub] , [|router] , [|gateway] , [|switch] , [|fiberoptic cable] , [|wireless] , [|client-server architecture] , [|network operating system] , [|internet protocol] (IP), [|port] , [|file server] , [|application server] , [|print server] , [|middleware] , [|"N-tier" architecture] , [|component software] , [|cluster] , [|thin client] , [|wide area network] (WAN), telecommunications technologies: [|plain old telephone service] (POTS), [|modem] , [|cable modem] , [|integrated services digital networks] (ISDN), [|digital subscriber line] (DSL), [|T1] , [|T3] , [|internet] , [|internet service provider] (ISP), [|intranet] , [|extranet] , [|virtual private network] (VPN), [|World Wide Web] , [|Web browser] , [|applet] , [|plug-in] , [|domain name] , [|uniform resource locator] (URL), [|file transfer protocol] (FTP), [|telnet] , [|SSH] (secure shell), [|hypertext] , [|http] (hypertext transfer protocol), [|markup language] , [|tags] , [|HTML] (hypertext markup language), [|XML] (extensible markup language), [|portable document format] (PDF)

=Read about= A [|network] refers to two or more computers and/or devices that can communicate (send/receive data) via cables (wired, e.g. [|fiberoptic cable]) or electromagnetic waves ([|wireless]) through [|network interface cards]. A network that operates in a small geographic range is also referred to as a [|local area network], with greater distances covered by a [|wide area network].

Hospital and laboratory information systems (LIS) function in networked environments. There are a variety of [|client-server architectures] including mainframe and thick or [|thin client]. Servers may be multiple and be specialized as a [|file server], [|application server] , [|print server], among others. Many laboratories also employ [|middleware], which adds another layer in-between client and server to create a three-tier architecture (see also [|"N-tier" architecture]).


 * Speed of connection**: [|plain old telephone service] (POTS), [|modem], [|cable modem] , [|integrated services digital networks] (ISDN), [|digital subscriber line] (DSL), [|T1] , [|T3]


 * Common communication protocols**: (rules to follow when sending information) [|protocol], [|internet protocol] (IP), [|http] (hypertext transfer protocol), [|file transfer protocol] (FTP), [|ethernet]


 * Secured networks**: [|intranet], [|extranet] , [|virtual private network] (VPN)


 * Internet**: [|World Wide Web], [|Web browser] , [|applet] , [|plug-in] , [|domain name] , [|uniform resource locator] (URL), [|file transfer protocol] (FTP), [|http] (hypertext transfer protocol), [|HTML] (hypertext markup language), [|internet service provider] (ISP)

=Activities=

#1: Drawing
Draw and label a diagram of different network topologies
 * 1) Star (central hub)
 * 2) Token ring (sequential connections)
 * 3) Linear bus (central backbone)
 * 4) Tree (branched)

=Online Resources=

=Questions=

=Advanced courses=
 * Thomas Malone. Course materials for 15.561 [|Information Technology Essentials, Spring 2005] . MIT OpenCourseWare, Massachusetts Institute of Technology.
 * Eytan Modiano, Dimitri Bertsekas. Course materials for 6.263J / 16.37J. [|Data Communication Networks, Fall 2002]. MIT OpenCourseWare, Massachusetts Institute of Technology.
 * Robert Gallager, Lizhong Zheng. Couse materials for 6.450 [|Principles of Digital Communications I, Fall 2006]. MIT OpenCourseWare, Massachusetts Institute of Technology.
 * David Forney. Couse materials for 6.451 [|Principles of Digital Communication II, Spring 2005]. MIT OpenCourseWare, Massachusetts Institute of Technology.
 * Lizhong Zheng. Couse materials for 6.452 [|Principles of Wireless Communications, Spring 2006]. MIT OpenCourseWare, Massachusetts Institute of Technology.

=Expert corner=

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