Routers vs. Firewalls

Review of the Basics We’re often asked at SmallNetBuilder what the advantages are of using a “high-end” or “enterprise” grade firewall, such as a Cisco PIX, Juniper Netscreen, etc., over a consumer-grade router. To get a good start on the subject, let’s review a few basics, the first being NAT. I’m sure many of you know what NAT (Network Address […]

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How Fast Is Your Network? Five Ways To Measure Network Speed

Knowing how fast your network can move data is a question for more than just tweakers and speed demons. It’s a key skill to have when testing out wireless, powerline, MoCA and other “alternative” (to Ethernet) networking technologies. Fortunately, it’s pretty easy to see how fast the bits fly and it even the pay-for options are easy on anyone’s wallet. […]

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How To: Setting up File and Printer sharing between two routers

Introduction We often hear from people who have two (or more!) routers in their LAN and are trying to get Microsoft File and Printer sharing running among all their computers. This ProblemSolver will explain why this doesn’t work by default and provide some suggestions for working around the problem. Setting Up Figure 1 shows a two-router LAN configuration that I’ll […]

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VLAN How To: Segmenting a small LAN

Introduction What is a VLAN? Is it some sort of highly expensive technology or virtual reality? Not at all. VLANs are relatively simple, yet they offer a wide variety of options and capabilities to improve your network. VLAN, or Virtual LAN, is a technology that enables dividing a physical network into logical segments at Layer 2. Functionally, VLANs enable a […]

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Protocols

Protocol Description IPX / SPX (NWLink) Internetwork Packet Exchange/Sequenced Packet Exchange. The default network protocol for Novell Netware prior to NetWare 5. (Current default is TCP/IP). NWLink is the Microsoft version of IPX/SPX. NETBEUI / NetBIOS These two terms are grouped together by many technical resources, which can be misleading. NetBEUI is the NetBIOS Extended User Interface. A non-routable protocol […]

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Cables

Cable Type Common Name Physical Layer Name Speed Max Length (M) RG-6 Satellite TV N/A N/A RG-8 Thicknet 10Base5 10 Mbps 50 (drop) 500 (backbone) RG-58 Thinnet 10Base2 10 Mbps 185 RG-59 Cable TV N/A N/A CAT3 UTP Fast Ethernet 10 Base-T 10/100 Mbps 100 CAT4 UTP Fast Ethernet 10 Base-T 16 Mbps 100 CAT5 Fast Ethernet 10 Base-T 100 […]

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IP Address Classes

Address Class Network ID Default SN Mask # Networks # Hosts Class A 1-126.0.0.0 (0) 255.0.0.0 126 16,777,214 Class B 128-191.0.0.0 (10) 255.255.0.0 16,384 65,534 Class C 192-223.0.0.0 (110) 255.255.255.0 2,097,152 254 Class A Loopback Address: 127.0.0.0 Private IP Addresses Class A 10.0.0.1 – 10.255.255.254 Class B 172.16.0.1 – 172.31.255.254 Class C 192.168.0.1 – 192.168.255.254

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