Desktop Network
15 Remote Desktop Solutions for Linux.
Mynitor: "But many people don't realize that it is easy to use an entire desktop over the network. There are a several of open source applications that can be used to achieve this."
 |
 Juniper Networks EX3300 48T BF EX 3300 48T switch 48 ports desktop  US $5,600.00
|
 Juniper Networks EX3300 48P EX 3300 48P switch 48 ports desktop US $4,499.99
|
 Aruba Networks 3200XM Wireless LAN Controller Desktop US $3,958.57
|
 Juniper Networks EX3300 48T EX 3300 48T switch 48 ports desktop US $3,680.00
|
 Juniper Networks EX3300 24T EX 3300 24T switch 24 ports desktop US $2,300.00
|
 Multi Tech MultiModem MTCBA G2 EN2 Wireless Router 1 x Network Port Desktop US $303.42
|
 CradlePoint CBR450 Wireless Router Cellular 1 x Network Port USB Desktop US $232.50
|
 CradlePoint CBR450 Wireless Router 1 x Network Port USB Desktop US $212.56
|
 EnGenius ERB9250 Wireless network extender 80211b g n desktop ERB9250 US $55.99
|
 Netgear 4 Port Gigabit Desktop Network Switch 1000 Mbps Gaming GS605AV US $47.41
|
 D2087A 16 Port 10 100Mbps 100M Desktop Network Ethernet Switch Fast US $42.99
|
 Linksys WMP54G 80211g 24 GHz 54Mbps Wireless Network Desktop PCI ADAPTER US $39.99
|
 motorola wireless 80211g pci adapter connects desktops to wireless network US $39.00
|
 300Mbps USB Wireless Network Adapter 80211n g b LAN Card for Desktop Laptop US $25.99
|
 BELKIN DESKTOP PCI TO CARDBUS PCMCIA NETWORK ADAPTER F5D6000T P56444 BRAND NEW US $24.99
|
 ASUS U8B N13 80211 B G N Desktop Laptop USB Network Adapter US $19.99
|
 300Mbps 80211n Wireless N Desktop PCI Network Card US $18.98
|
 USB wireless network adapter for NB Desktop PSP NDS US $18.75
|
 Wireless USB 300Mbps 80211B G N network Adapter For laptop desktop WIFI Antenna US $17.28
|
 Wireless USB 300Mbps 80211B G N Network Adapter For Laptop Desktop WIFI Antenna US $17.19
|
 Wireless USB 300Mbps 80211B G N network Adapter For laptop desktop WIFI antenna US $17.18
|
 NEW D Link DWA 130 Wireless N 80211 USB Wifi Network Adapter Laptop Desktop US $16.00
|
 NETGEAR WNA1100 WIRELESS N N150 USB WIRELESS NETWORK ADAPTER LAPTOP DESKTOP BNIB US $15.49
|
 Cisco Valet Connector Desktop Laptop Notebook Wireless Wifi USB network adapter US $14.99
|
 3COM DESKTOP ROUTER 3000 SERIES 3016 T1 ST1 PRI NETWORKING OFFICE HOME US $14.99
|
 NETGEAR WIRELESS N USB ADAPTER WNA1100 N150 EASY NETWORK SETUP LAPTOP OR DESKTOP US $14.99
|
OSI Network Model
Enterprise Networking Defined
An enterprise network is a large network comprised of hundreds or thousands of workstations all connected with WAN circuits across many states and/or countries. The components are comprised of network devices, circuits, servers, applications, security and network management that connect employees for the purpose of supporting business processes. It is business processes that make companies profitable. The leveraging of new technologies to reduce costs and increase revenue is a business strategy that many companies have employed recently. That is contrasted with the Internet Service Provider (ISP) market, which refers to companies whose business it is to sell infrastructure, web hosting and application services to small, medium and enterprise companies. Many enterprise companies now rely on ISP for some or all of the mentioned components that comprise an enterprise network. Usually all circuits are provisioned with the ISP. Some devices are ISP owned and the servers and applications can be all ISP owned if you have a hosting agreement with them that provides those services. Management and security of your network can be outsourced to an ISP as well, which is becoming popular with many Fortune 500 companies. Examples of that are AT&T and IBM, who offer outsourcing agreements with many services and otions.
OSI Model as a Phone Call
The OSI model was developed years ago as a reference for network protocol and application designers to build their products with an open standard. That would promote a standard for developing network devices, interfaces, applications and services that would work together. It is a model rather than a specification since it defines layers and services for those layers and how each layer works with the layer above and below it. The model is a representation of how a network operates much the same as a phone call. A phone call from your home to a particular destination requires a physical connection that electrically connects those two locations. When you take your phone off hook to make a call that is similar to layer 1 physical and layer 2 data link services. When you dial a number that is a layer 3 network service or phone number routing. When someone answers the phone call that is similar to layer 4 transport and layer 5 session services with talking and listening. The specific language that you are speaking is layer 6 presentation and layer 7 application services. Today's data networks use similar design principles.
OSI Layers and Your Business Network
Your desktop computer at work is connected to an application server over a physical media such as unshielded twisted pair (UTP) cable. That layer 1 service is the electrical signaling from your desktop to a campus switch and from a campus switch to a server. Your desktop network Interface Card connects your desktop to the network cable and uses a layer 2 data link protocol such as Ethernet that establishes a connection with the campus switch and defines when that desktop has access to the network. Before sending data, the desktop must know the address of the server to which it is sending data. That is a layer 3 network service. The layer 4 transport service establishes a logical connection between server and desktop for coordinating traffic flow. As well layer 4 does error correction and re-transmission of packets if there are problems with data delivery. With the data connection established it is the layer 5 session service that maintains a logical connection between application processes at the desktop and server. The formatting of the data for a particular application is a layer 6 presentation service. Many applications will utilize their own formatting which is something you learn when you open files from different word processing vendors. The application interfaces with the OSI model at layer 7, which is the application layer. This level defines an API that applications use to develop their specific applications that will work with that layer.
OSI Model and Microsoft Windows
The development of open industry standards at various layers of the OSI model has contributed to the proliferation of multi-vendor network integration. Some examples of application layer services are FTP, Telnet, SNMP and many applications that are used over a typical network. Microsoft has done a lot of work to standardize their Windows platform API so that third party application developers can write programs for that operating system. When you exam Windows 2007, for instance, you will notice that it provides services at layers 3 - 7 of the OSI model. The argument could be made that Microsoft is involved with layer 1 and layer 2 services as well since there are some software drivers for network interfaces that are available from them.
When describing client network software from Microsoft that runs at each desktop, it is describing all of the programs such as protocol stacks, network interface card drivers, and programs that integrate these elements. The network driver software is typically found at layer 1 through layer 4 while application developers will focus on layers 5 - 7 of the OSI model. It should be noted that the OSI model is a model which suggests that it provides guidelines for network developers. Some network software such as SNA does not define a network layer 3. The result is that it is not routable and a service such as encapsulation or tunneling must be used at the router for sending data across a network that is using a network layer and associated ip addressing. An example is integrating an SNA network which doesn't have a network layer with a Windows network using IP network services.
Network Planning and Design Guide is available at amazon.com and eBookmall.com
Shaun Hummel is an author of various technical books and has a web site focused on information technology job search solutions and certifications.
http://www.networkjobsolutions.com
About the Author
Shaun Hummel, CCNP, is a Senior Network Engineer with 11 years experience in enterprise network planning, design, and implementation. He has worked for various private and public companies in Canada and the United States improving infrastructure, security, and management. He has written Network Planning and Design Guide, Cisco Wireless Network Design Guide and Network Assessment Guide. www.networkjobsolutions.com