Question { 7747 }

There are 4 network Interfaces, how can we find which one
is Primary.

Answer

You can use "netstat -nr" in which it displays the ip
address of the interface individually, even if you have
VMware machines in your system,
One more command is "mii-too" in that it displays the
interface status is up when you connect the network cable.
(eg) mii-tool eth0
eth0- link ok up. Negotiated
eth1- no link

Question { 6779 }

why accounting Software does not support on linux?

Answer

We have GNUcash version is 2.2 and also we can install tally
in linux. I think GNUcash 2.2 is the best for linux for
accounting software.

Question { Bayer, 55483 }

What is the difference between Telnet and SSH?

Answer

ssh is a secured shell, where telnet is not a secured
one.when you ssh to trasnfer data between a system, the data
will be send in the encrypted form, where the hacker cannot
encode or decode it. While you telnet,the data send between
the system is alphabetical format(ASCII), where every one
can understand. More over as per network security, telnet
and ftp are prohibited. Always, trust SSL based data transfer.

Question { TCS, 8918 }

Please explain the file structure of linux?

Answer

root - The home directory for the root user
home - Contains the user's home directories along with
directories for services
ftp
HTTP
samba
george
bin - Commands needed during bootup that might be needed by
normal users
sbin - Like bin but commands are not intended for normal
users. Commands run by LINUX.
proc - This filesystem is not on a disk. It is a virtual
filesystem that exists in the kernels imagination which is
memory.
1 - A directory with info about process number 1. Each
process has a directory below proc.
usr - Contains all commands, libraries, man pages, games
and static files for normal operation.
bin - Almost all user commands. some commands are in /bin
or /usr/local/bin.
sbin - System admin commands not needed on the root
filesystem. e.g., most server programs.
include - Header files for the C programming language.
Should be below /user/lib for consistency.
lib - Unchanging data files for programs and subsystems
local - The place for locally installed software and other
files.
man - Manual pages
info - Info documents
doc - Documentation
tmp
X11R6 - The X windows system files. There is a directory
similar to usr below this directory.
X386 - Like X11R6 but for X11 release 5
boot - Files used by the bootstrap loader, LILO. Kernel
images are often kept here.
lib - Shared libraries needed by the programs on the root
filesystem
modules - Loadable kernel modules, especially those needed
to boot the system after disasters.
dev - Device files
etc - Configuration files specific to the machine.
skel - When a home directory is created it is initialized
with files from this directory
sysconfig - Files that configure the linux system for
devices.
var - Contains files that change for mail, news, printers
log files, man pages, temp files
file
lib - Files that change while the system is running
normally
local - Variable data for programs installed in /usr/local.
lock - Lock files. Used by a program to indicate it is
using a particular device or file
log - Log files from programs such as login and syslog
which logs all logins and logouts.
run - Files that contain information about the system that
is valid until the system is next booted
spool - Directories for mail, printer spools, news and
other spooled work.
tmp - Temporary files that are large or need to exist for
longer than they should in /tmp.
catman - A cache for man pages that are formatted on demand
mnt - Mount points for temporary mounts by the system
administrator.
tmp - Temporary files. Programs running after bootup should
use /var/tmp.

Question { Bank Of America, 13646 }

How is the difference between ftp and sftp ? and explain
how to create ftp server and sftp server with example ?

Answer

FTP file transfer happens via 2 channel. command channel and data channel. where command channel responsible for user,pass ,quit and it will be active still sessions active. Other process like data transfer and receive will happen via data channel. No encryption and it can be decoded and readable via global network.

In SFTP, it uses secure shell for this process and both command and data transfer happens on same encrypted cipher method. Due to this it is secure.