Posts Tagged ‘Network Infrastructures’

What Is The Real Difference Between LAN And WAN Computer Network Infrastructures?

January 8th, 2010



Although a business shouldn’t be confused on what the differences are between Local Area Network (LAN) and Wide Area Network (WAN) … too often those entrusted with finding a bandwidth solution for their business aren’t clear on these basic tenets of overall computer network infrastructure. If not completely understood it affects the quality and accuracy of the final decision. So … it’s important to get it right.

So …. in the interest of clarity here’s the real differences between LAN and WAN:

LAN – A local area network (LAN) is a computer network covering a local area, like a home, office, or group of buildings in close proximity to each other. Current LANs are most likely to be based on switched IEEE 802.3 Ethernet, or on Wi-Fi technology running at 10, 100 or 1,000 Mbit.

In general a local area network is made up of devices in local proximity to each other and has finite distance limitations. The LAN can be either wired or wireless but is only at a single location.

WAN – A wide area network or WAN is a computer network covering a broad geographical area. Contrast with personal area networks (PANs), metropolitan area networks (MANs) or local area networks (LANs) that are usually limited to a room, building or campus. The largest and most well-known example of a WAN is the Internet.

A wide area network (WAN) is comprised of multiple LANs connected to each other across distances. And example would be a corporate office connected to each of its satellite offices. This method of interconnection is handled via a third-party carrier — i.e. Qwest provides the wiring connecting two locations together.

WANs are used to connect local area networks (LANs) together, so that users and computers in one location can communicate with users and computers in other locations. Many WANs are built for one particular organization and are private. Others, built by Internet service providers, provide connections from an organization’s LAN to the Internet. WANs are most often built using leased lines. At each end of the leased line, a router connects to the LAN on one side and a hub within the WAN on the other. Leased lines can be very expensive. Instead of using leased lines, WANs can also be built using less costly circuit switching or packet switching methods. Network protocols including TCP deliver transport and addressing functions. Protocols including Packet over SONET, MPLS, ATM and Frame relay are often used by service providers to deliver the links that are used in WANs. X.25 was an important early WAN protocol, and is often considered to be the “grandfather” of Frame Relay as many of the underlying protocols and functions of X.25 are still in use today (with upgrades) by Frame Relay.

For professional help in finding just the right LAN or WAN solution for your business applications …. use the no cost assistance available through DS3-Bandwidth.com.

By: Michael Lemm

A+-Network+ Training and Certification

December 11th, 2009



A+ certification is possibly the most popular way of breaking into the computer tech business, as it demonstrates basic competency regarding computer hardware and software. Offered by CompTIA, the certification involves taking two tests: the A+ Essentials exam and a choice of one of three elective exams: IT Technician, Remote Support Technician, and Depot Technician. The knowledge base required involves understanding how to take apart a computer and put it back together, how to build a computer from its basic components, knowledge of the purpose and function of component parts such as the motherboard, CPU, display devices, power supply, and cooling system, among others.

In addition, on the software end, the A+ certificate seeker is required to know all about modern operating systems. While CompTIA is vendor-neutral, it emphasizes knowledge of the Windows operating system, because A+ certification is designed to produce computer technicians who can make a living, and Windows holds the lion’s share of the OS market. However, the certificate seeker is still required to have a basic understanding of Apple and Unix-like operating systems. He or she is required to understand the boot process as well as the basic framework of multiple operating systems, so that he or she can provide adequate support to customers needing assistance.

Regarding Network+ certification, the basic premise is the same as that for A+ certification, except it is required for anyone who wants to be an IT network technician. The certification shows that the successful Network+ candidate is able to maintain, configure, install, troubleshoot, test and manage all sorts of network infrastructures, has an understanding of modern networking technologies, basic design principles, and grasps modern wiring standards. In addition, the Network+ certificate seeker benefits from having the A+ certification since Network+ requires the same technical skills as a foundation. Networks contain multiple computers, as well as the nexuses between them, so it’s far trickier to troubleshoot than just a single computer.

The specifics involved in the Network+ test involve knowledge of common networking protocols, both wired and wireless, as well as an understanding of all the hardware involved in creating a network. He or she must know how to set up a fast and secure computer network utilizing firewalls, routers, and switches, and ensure that it is free of viruses and malware. The certificate seeker must be familiar with all the tools of the trade, as software-based and immaterial as packet sniffers and port scanners or as gritty and hardware-based as cable-strippers and temperature monitors. He or she must be able to diagnose problems and have adequate knowledge to come up with a solution.

Any job with a major technology company involving technical expertise will require A+ certification, and if you’re looking to be a network or systems administrator, Network+ is increasingly necessary for your career. Many major corporations, such as Microsoft, Cisco, Novell, and HP, include the CompTIA Network+ and A+ certification in their mandatory training requirements.

By: Ryan Corey