Computer Fundamentals and Troubleshooting 1

Windows Troubleshooting 101 Verify Connections Reboot

3 Types of Connectors DB-9, DB-25: used for serial and parallel port communications, respectively RJ-11, RJ-12: standard telephone connectors RJ-45: network connector PS/2 (mini-DIN): supports mouse, scanners, and some keyboards Centronics: supports printers USB: supports a variety of peripheral devices

4 IEEE 1394 (FireWire) High-speed interface that allows up to 62 devices on a chain Advantages: hot swap, inexpensive connectors, simple cable design 6 pin or 4 pin cable 400 Mbps data transfer May be referred to as: IEEE 1394, FireWire, i.LINK 6 4

5 Universal Serial Bus (USB) Connects peripherals outside the computer Supports speeds of 12 Mbps (USB 1.1) Support speeds of 480 Mbps (USB 2.0) Offers the following advantages: Hot swap Ease of adding new devices Cable is A or B ended A B

6 Parallel Printer Cables

7 Troubleshooting Cables Always check the cable first. Always check for loose connections. Check for bent or broken pins. Do not use force to insert cables Check for worn or frayed cables. Ensure that you are using the correct cable.

Monitors Troubleshooting your display 8

9 Common Display Settings

10 Monitor Maintenance Properly ventilate the enclosure. Clean the face of the CRT gently. Use energy-saving features. Check the cables, including the power and display cables. Check the front panel controls. Try another display adapter.

Basic Requirements of a Network A network links computers for communicating and sharing information and resources. A network must provide Connections Communications Services

Local Area Networks Cover a limited distance Allow sharing of data, peripherals, software, and storage

Wide Area Networks Span relatively large areas Typically consist of two or more LANs Are connected using telephone or leased lines

Network Operating System Network operating systems (NOSs) provide the ability to share file, print, and other services. Computers can be servers, clients, or both.

Network Interface Cards (NICs) Provide the physical connection between the computer’s expansion bus and the network cable Boost the digital signal from the computer

IP Addressing TCP/IP Address – Uniquely identifies your computer on the network Allows communication on the LAN and to the internet Your IP Address must be unique – address conflicts cause loss of connectivity IPCONFIG x.x or

Address Specifics IP Address Subnet Mask Default Gateway DNS WINS 17

File Server Domain Controller Building Firewall DDN/Internet School Network Layout