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Small Business Networking Examples

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					Building LANs                                                               UWS


Small Business Networking Examples
This section highlights common examples of network designs for growing
businesses. Examples include:

      A LAN for a small office
      As the office network grows
      A WAN for multiple small sites
      A small-scale VPN

A Local-Area Network for a Small Office

This LAN starts simply-shared Ethernet, with a pair of servers and analogue
modems connecting employees to the Internet. Employees can share
documents, presentations, spreadsheets, and customer reports between
computers; they can dial up the Internet for occasional research; they can
communicate via e-mail; and the business can save money by sharing
printers, modems, and hard-drive storage between users.
Because of the bandwidth demands that high-performance applications place
on the network, traditional shared 10 Mbps Ethernet networks will not provide
an adequate foundation for very long. In recent years, the price of 10/100
Mbps LAN switches has dropped significantly. Migrating from 10-Mbps shared
Ethernet hubs to 100 Mbps Fast Ethernet switches, then, has become quite
affordable, and customers can realize exponential network performance
boosts at a very attractive price. In addition, they can gain these benefits with
minimal disruption to their networks because Fast Ethernet is based on the
same protocol as traditional Ethernet, and the expertise required is virtually
the same.




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Building LANs                                                                  UWS


As the Office Network Grows

Unfortunately, this network cannot accommodate the growing demands
of the business. Too many users are competing for the 10 Mbps
Ethernet network pathway. Only one user can connect to the Internet at
one time from a modem. And as employees begin incorporating more
graphics in their files and sending these files back and forth between
their clients and the server, network performance stumbles.
The solution is to segment the network using Ethernet switches and add
a router for Internet connections. This setup provides more bandwidth
for all employees and permits multiple simultaneous links to the Internet
through one line. The business can give product designers using
bandwidth-hungry computer-aided design (CAD) programs the
performance they need and dedicated 10 Mbps Ethernet channels to
their individual workstations. And the network upgrade saves money by
incorporating existing equipment and wiring.




A Wireless LAN
If the business wants to add mobility or flexibility to its network, it may
choose to add a wireless network segment as a complement to or
substitute for portions of its wired LAN. Properly deployed, wireless LAN
components can allow employees to remain connected regardless of
where they are on campus. This setup offers scalability to the small
business that may have to host differing numbers of mobile workers,
such as sales people. Wireless networking can also be used in
situations where pulling cable for wired network is not possible, or


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Building LANs                                                                 UWS


doesn't make good fiscal sense; for example, in older or historic
buildings, or leased office space.




A Wireless Bridge for Multiple Small Sites
Many businesses choose to link multiple sites by building a WAN, using
some type of direct connection such as a T1 line. Wireless networking
offers another option in the form of building-to-building bridges. These
bridges allow the business to expand its LAN. This option can be
worthwhile if a business needs to go through the time and expense of
physically connecting the buildings, and if the buildings have a line-of-
sight access within 25 miles of each other.




A Wide-Area Network for Multiple Small Sites

To improve communications between a pair of small remote offices and a
central office, a business decides to install a WAN. The upgrade also will
allow the business to economize on Internet connectivity by offering all offices
a link through a central high-speed line.




A High-Performance WAN
A growing business sees rising network traffic at its three locations in different
cities. It wants to install future-ready local networks to support rapidly rising


Networking Examples                                                         Page 3
Building LANs                                                               UWS


traffic volumes. It also wants to provide high-speed WAN links to allow
employees at the Chicago and Omaha offices to take advantage of video
training, which originates at the Minneapolis office. In addition, because
several sales employees work from home, the business wants to allow them
to dial up their local servers from home.




A Small-Scale VPN

A small business is adding remote sites and users at a hectic pace.
Connecting them all via leased lines and dialup access would require the
business to devote more time to administering its wide-area network and
would mean dramatically higher line charges and long-distance phone bills
each month. Instead, the company chooses to implement a VPN, with help
from its SP. The SP has access points to its network across the nation, so the
remote users can connect with their company's central network using
inexpensive local calls. At the central site, a Cisco 1720 access router with the
added VPN module provides an all-in-one solution for connecting to the SP
(and the public Internet). It integrates a router, firewall, encryption and
tunneling services, password protection, and a high-speed link to the central
site LAN.




Networking Examples                                                        Page 4
Building LANs                                                           UWS


Networking Basics Checklist
The following checklists provide a general idea of the components you will
need to install your network. These are meant to be approximate guidelines
only; your own installation will vary based on your needs.
Building a Small LAN

      Clients with NICs installed
      Server
      Hub
      Cabling
      Network operating system software (for example, Windows 2000,
       Windows NT, Novell NetWare, LANtastic, and AppleShare)
      Modem for dialup Internet access (optional)




Wireless Networking for Small LAN

      Clients with wireless NICs installed
      Correctly deployed access points

Connecting Offices and Departments

      Clients with NICs installed
      Servers
      Hubs
      Switch
      Cabling
      Network operating system software (for example, Windows 2000,
       Windows NT, Novell NetWare, LANtastic, and AppleShare)
      Router for shared Internet access (optional)



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Building LANs                                                          UWS




Wireless Networking for Connecting Offices and Departments

      Clients with wireless NICs installed
      Correctly deployed access points

Connecting Dispersed Office Sites

      Clients with NICs installed
      Servers
      Hubs
      Switches
      Routers at each location for WAN connections, shared Internet access
      Access Server for dialup access for remote users
      Cabling
      WAN Service (ISDN, Frame Relay, or leased line service from phone
       company)
      Network Operating System software (e.g., Windows 2000, Windows
       NT, Novell NetWare, LANtastic, and AppleShare.)




Networking Examples                                                   Page 6
Building LANs                                                UWS




Wireless Networking for Connecting Dispersed Office Sites

      Building-to-building bridges




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