Chapter 12 Study Guide

Network Configuration

Networks

Be sure to have a basic understanding of local area networks and wide area networks, and their components.

Consists of four octets. Each octet represents an 8-bit binary number(0-255). Ex: 192.168.1.1
32 bit address(4 octets = 4 x 8 = 32)
Subnet mask is used to determine the host portion of the IP address.
Default Gateway directs traffic destined to other networks(LANs). Ex: to the internet.

Uses 128 bits. Capable of supplementing 340 trillion trillion trillion IP addresses.
No subnetting required due to an abundance of address space.
First half of address represents your network. Second half uniquely identifies computers on the LAN(link local).

NIC(Network Interface Controller) drivers are usually contained within modules that can be inserted to the Linux kernel.
Modules end with the .ko(kernel object) extension and are typically stored in /lib/modules directory.
Use insmod or modprobe commands to manually load modules into the Linux kernel.
Use lsmod or rmmod commands to remove a module from the Linux kernel.
Configure the loaded module driver for the NIC using the ifconfig(interface configuration) command.
dhcpclient eth0 command configures a NIC for dynamic host configuration protocol.
To show interface statistics use ifconfig or netstat -i.
The ifdown eth0 and ifup eth0 commands can be used to deactivate and active the network interface, respectively.
The ping command is used to test network connectivity.
All configuration options can also be achieved through a GUI within the Network Configuration tool.

insmod
modprobe
lsmod
rmmod
ifconfig
netstat
ifdown
ifup
dhcpclient
ping