Transcript Ethernet and Wifi

Ethernet and Wifi
Chapter 7 & 8
Send and Receive Data
network adapter or network interface NIC card
the most common wired Ethernet network interfaces
Built into the Motherboard
RJ-45 & RJ-11
A printed circuit card that mounts inside the computer
A PC card that plugs into a laptop computer
An external unit connected to the computer through a USB
cable
Ethernet ports as
standard features
Setting the BIOS Utility
a set of controls that load configuration settings when
you turn on the computer
recognize both the internal and external adapters
Adding a NIC to an Old Computer
Ethernet adapters are available both as inexpensive
no-name products and slightly more costly brandname versions
To install an internal Ethernet adapter, follow these
steps
USB Adapters
Network Adapters for Laptops
Network Adapters for
Laptops
NIC Cards
The three indicator lights are:
LINK Lights in green when the adapter is connected to
a live network
10/100 Lights in yellow when the adapter is connected
to a 100 Mbps network; goes dark when it’s
connected to a 10 Mbps network
ACT Flashes in green as data passes through the
network connection in either direction
WIFI networks
Chapter 8
Wi-Fi
Radio signals instead of Ethernet cables to connect
computers and other devices to a LAN
Wi-Fi connections are far less secure than wired
networks
Types of Wi-Fi Networks
Operating Channels
radio spectrum
2.4 GHz band, there are 14 overlapping Wi-Fi radio
channels
Wi-Fi signals
Access Points
Wi-Fi access points
radio transmitter/receivers (transceivers)
802.11g or 802.11n
A Wi-Fi adapter can also exchange data by radio directly
to and from another computer in an ad hoc network
Network Interface
Adapters
Adapters Built into Laptops
PC Cards
USB Adapters
PCI Cards
Antennas
Wi-Fi Control Programs
Access Point Configuration Programs
DHCP
IP address
Wireless network name
Channel number
Operating mode
Wireless Connection
Programs
programs display a list of all nearby Wi-Fi access points
and identify those that are using encrypted data
Wi-Fi control program should automatically use the
password and other configuration
Hybrid (Wired-Wireless) Networks
Wi-Fi Security