Internet Connections
Physical – NIC card to connect to local net
Logical – Use a standard set of protocols (TCP/IP)
Applications – Web browsers, Html, FTP
NIC Card Resources
• Serial Connection to the network (not a serial port)
• IRQ (interrupt request)
• I/O address (Port addresses)
• Upper memory address range (640k-1M)
NIC – Modem InstallationModem – modulator / demodulator
• Used to provide connectivity to analog telephone lines
• Low speed interface using serial or USB ports
NIC – Network Interface Card
• Interface for a host to the network
• Available in different types depending on computer system and network
•PCMCIA (PC Card), ISA, PCI
•Desktop, notebook, server
•Ethernet, token ring, FDDI
High Speed and Dial-up Connectivity
•DSL (Digital Subscriber Line) and Cable modems provide the most common forms of high speed access
•Provide low cost connectivity without affecting regular phone or cable service.
The Ping utility works by sending multiple IP packets to a specified destination, each packet containing a request for a response. Below are examples of ping commands that are commonly used for testing network connectivity.
PC/Network Troubleshooting
Problems can exist in hardware, software or network configuration as well as network cables and devices.
Binary Representation of DataASCII
6566676869707172
The binary codes shown above use a weighted system where each digit has a different positional weight (128,64,32,16,8,4,2,1).
A binary 0 might also mean off, low, disabled, 0V
A binary 1 might also mean on, high, enabled, +5V
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