The study of computer network concepts or Computer Network Training is to prepare for certification and employment as a network tech. The CompTIA organization has a Network+ life-
OSI Model
time certification that can help you to get a job in the exciting IT (Internet Technology) field. One of the first areas of study is the seven layer OSI Model. The better you understand the OSI Model the better you will understand computer networking. I would strongly suggest that you get very familiar with this model, the associated protocols, functions, equipment, and PDU’s at each layer.
PDUs (protocol data units)
PDUs are data packets associated with each level of the OSI Model. Layer 1 the Physical layer the PDU is called a Bit. Layer 2 the Data Link layer the PDU is called a Frame. Layer 3 the Network layer the PDU is called a Packet. Layer 4 the transport layer the PDU is called a Segment. Above layer 4 the PDU is called Data.
The study of Computer Network Training and Computer Repair Training can lead to some very rewarding careers. But remember the OSI Model is the key to understanding how networks function.
FIXMBR is a Windows XP Recovery Console command. This command is used to repair or correct a corrupted or infected MBR. The MBR is the master boot record which is the first sector on a hard drive. Since it is the first sector read it is prone to virus infections. Also if it becomes corrupted it prevents access to your hard drive and your operating system. Therefore a tool in the Windows XP Recovery Console has been provided to quickly fix the MBR. You can also use FDisk MBR which accomplishes the same thing in DOS. There is an article explaining Fdisk MBR in more detail at Fdsik MBR. Also another article that takes about FIXMBR in more detail at FIXMBR. The Recovery Console also has many other DOS like commands that can be used to help maintain and repair other files and folders on your hard drive. Many of the commands that can be accessed, such as, copy, del, rd, md, chkdsk, fixmbr, and many others, can be very helpful to keep Windows running efficiently.
The Computer Repair Training website has some additional information you might find helpful.
Computer repair training plus develops a knowledge base and the appropriate 
skills needed to repair and maintain computers. There are many vocational, trade tech, and college level classes available. The Regional Occupational Centers (ROPs) where I teach are great places to learn. They are usually free or very low cost and provide working industry experts that give you valuable hands-on experience. I have had several IT college graduates that told me that this was the first time they ever got to actually touch the insides of a computer and apply what they learned. Application of the knowledge is what helps develop necessary computer repair skills. We take the computers down to the bare metal and then build them back up. You learn how to properly configure hard drives so that maintenance and backups are easy to perform. You will learn all about the Windows operating system and all its short comings and problem areas, such as, why is my computer so slow. You will learn about many open source utilities and programs that will help greatly in troubleshooting and maintenance. All this should be helping you to obtain the A+ certification from CompTIA . A+ will open many doors to this exciting field. There is some study you will have to do, but you will find it very rewarding as all the mystery of computers is revealed and you become a proficient tech.
The Computer Repair Training website has some additional information you might find helpful.
