Computer Networking

If your small business has a need to connect their computers together to share resources (Internet Access, printers, plotters, CD-ROM’s, storage/HD, etc) – Nyetech can help!

We can install and support Switches, Firewalls, Routers, Bridges and WiFi – as well as appropriate Category 6 or 6a wiring and connections. Switches are usually wired together via fiber or 10GB Ethernet. In addition, we can install firewalls to secure your network yet also allow Virtual Private Networking (VPN).

For information on what these terms mean, read below.

Contact us if you would like to discuss your needs!


Switches are similar to Hubs but more advanced. Switches are used within a private network and they isolate data flow and improve performance over Hubs. In a switch, data between two lightly used computers will be isolated from data intended for a heavily used server, for example. Or in the opposite case, in “auto sensing” switches that allow mixing of 10 and 100Mbps connections, the slower 10Mbps transfer won’t slow down the faster 100Mbps flow.


This is a tool designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. All messages entering or leaving the private network (ie: Intranet or LAN) to the Internet, pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

There are several types of firewall techniques:

Network Address Translation: An Internet standard that enables a local-area network (LAN) to use one set of IP addresses for internal traffic and a second set of addresses for external traffic. A NAT box located where the LAN meets the Internet makes all necessary IP address translations. NAT provides a type of firewall by hiding internal IP addresses

Packet filter: Looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.

Application gateway: Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation.

Circuit-level gateway: Applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.

Proxy server: Intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.

In practice, many firewalls use two or more of these techniques in concert.

A firewall is considered a first line of defense in protecting private information. For greater security, data can be encrypted.


Routers forward data packets from one place to another, typically from one network to another! Routers forward data depending on the Network address, not the Hardware (MAC) address. For TCP/IP networks, this means the IP address of the network interface.

Routers isolate each LAN into a separate subnet, so each network adapter’s IP address will have a different third “octet” (Example: and are in different subnets.). They are necessary in large networks because the TCP/IP addressing scheme allows only 254 addresses per (Class C) network segment.

Routers, like bridges, provide bandwidth control by keeping data out of subnets where it doesn’t belong. However, routers need to be set up before they can get going, although once set up, they can communicate with other routers and learn the way to parts of a network that are added after a router is initially configured.

Routers are also the only one of these four devices that will allow you to share a single IP address among multiple network clients.


Bridges do not know anything about protocols, and just forward data depending on the destination address in the data packet. This address is not the IP address, but the MAC (Media Access Control) address that is unique to each network adapter card.

Bridges are very useful for joining networks made of different media types together into larger networks, and keeping network segments free of data traffic that doesn’t belong in a particular segment.