RHCE RHCT Examination Questions

How to access virtual console in RHEL4/RHEL 5?

Five virtual are provided during installation process in Redhat enterprise Linux servers. Virtual console can't be accessed using ALT-function ket

Combinations:

ALT-F1 : to access installer in text mode (RHEL4/RHEL5) ALT-F2: to access bash shell (RHEL4/RHEL5)

ALT-F3 to view log of installer messages (RHEL4/RHEL5) ALT-F4: to view log of kernel messages (RHEL4/RHEL5) ALT-F5 stdout of mke2fs and grub command (RHEL4/RHEL5) ALT-F7 : access installer in Graphical mode. (RHEL4/RHEL5) 
 

Howto configure the network card in redhat enterprise 5 Linux?
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.

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
 

How to load USB driver in Linux?

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
 

How would you list loaded modules in Redhat Enterprise 3/4 Linux ? 

Ans: lsmod
 

How to check memory usage?

Wile 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

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