RHCE RHCT Exam questions:Howto configure the network card in redhat enterprise Linux

RHCE RHCT Exam questions:Howto configure the network card in redhat enterprise 5 Linux :

Question. I’ve installed Red Hat enterprise Linux 5 and now added one more LAN card (NIC). How do I configure the network card from the command line? I can see 2nd my network card detected while booting the IBM server.
Answer . Red hat Linux provides following tools to make changes to Network configuration such as add new card, assign IP address, change DNS server etc.

(a) GUI tool (X Windows required) - system-config-network
(b) Command line text based GUI tool (No X Windows required) - system-config-network
(c)Edit configuration files stored in /etc/sysconfig/network-scripts/ directory

GUI can be launched using system-config-network

RHCE RHCT Exam questions : How to load USB driver in Linux

Question: RHCE RHCT Exam questions : How to load USB driver in Linux ?
Answer : in Redhat Enterprise Linux servers (RHEL3/RHEL4/RHEL5) usb drivers can be loaded on fly using modprobe command :

$modprobe usb-uhci

$modprobe usb-ohci

similarly modules can be removed or unloaded using "modprobe -r"

also insmod can be used to add module

RHCE RHCT Exam questions :

RHCE RHCT Exam questions

Question: How would you list loaded modules in Redhat Enterprise 3/4 Linux ?
Answer : lsmod

RHCE RHCT Linux Certification Exam: How to check memory usage

while Preparing for RHCE and RHCT exam certification one should know how to check memory utilization in redhat enterprise Linux. one useful command is free , you can get memory usage in megabytes and gigabytes :

[root@ldev ~]# free -m
total used free shared buffers cached
Mem: 992 975 16 0 137 628
-/+ buffers/cache: 210 781
Swap: 2047 0 2047