The old boy first exam question

1. What is GNU

The GNU program, also known as the Slave Project, was launched publicly by Richardstallman on September 27, 1983.

Its goal is to create a set of completely free operating systems.

GNU is the recursive abbreviation of "GNU ' Snotunix"

1985 Richardstallman founded the Free Software Foundation (freesoftwarefoundation)

To provide technical, legal and financial support for the GNU program.

By the year 1990, the GNU program has developed software that includes a powerful text editor

Emacs. GCC (Gnucompilercollection,gnu compiler Collection),

is a set of programming language compilers developed by GNU. As well as libraries and tools for most UNIX systems.

The only important component that remains unfinished is the kernel of the operating system (known as Hurd).

2. What is the GPL?

The GNU contains 3 terms of agreement,

GPL:GNU general Public License (Gnugeneralpubliclicense)

LGPL:GNU more lenient Public License (Gnulessergeneralpubliclicense),

Formerly known as Gnulibrarygeneralpubliclicense (GNU Library general Public License);

Gfdl:gnu the short form of a free document license (Gnufreedocumentationlicense).

3, the common Linux version! The Linux version you work with!

CentOS rathat Fedora Red flag, unicorn, Ubuntu,

4, Rathat and CentOS difference?

CentOS is an important branch of Rathat. Is rathat remove the charging software and then

Re-written following the GPL agreement. CentOS is not copyrighted and Rathat is copyrighted.

What is the difference between 5, 32-bit systems and 64-bit systems? How to choose?

1, the original design is different! 2, support different memory! 3, the operation speed is different!

1, the original design when the positioning is different. 2, the installation requirements of different configurations.

3, the operation speed is different. 4, the addressing ability is different! (Larger memory support).

6, the Vmwaer network card common three kinds of modes.

1. NAT (Network Adderss translation) address translation.

2, bridged bridge mode

3, Host-only (host only)

7, to the new company into the job, the company's server is missing some lectures in some of the package, how to find the missing that

Some bags, how to remedy?

Yum Grouplist

Yum groupinstall "Compatibility Libraries" "Base"

"Development Tools"

Yum groupinstall "Debugging Tools" "Dial-up Networking Support"

8, how to distinguish the server of different scene in the work?

/boot 200M

Swap memory 1.5 times times when memory is greater than 8 g time 8-16 G

/50-200g

/bata remaining space Storage data (business of important data), portal, large enterprises do not divide

9. What is LVM and what is RAID?

LVM means logical volume management: The partition size is dynamically adjusted. LVM format, or partition designator 8e

RAID Card: Dell array Card

Basic role: The amount of data on the site, a single disk can not be installed, with a number of disks, but do not want a single disk

Storing the data requires the tool to integrate all the hard drives into one large disk, and this large disk

Partition to place data.

10. Describe the characteristics of RAID0, RAID5 and RAID10.

RAID0: One or more disks, integrated into a hard disk by a RAID card! I/O fast

RAID1: Two hard drives are composed to back up data by mirroring principle! Redundant 100% I/O slow

The storage volume is a smaller hard disk. A maximum loss of a disk.

RAID5: Three pieces of hard drives, backed up by odd-and-even principle! Redundant times RAID1

Storage capacity is n-1 block hard drive. A maximum loss of a disk.

RAID10: At least 4 pieces of disk, compatible with RAID0 and RAID1 features. Loss of up to two disks

The amount of storage is N/2.

11, say you know the common Unix system version.

SUN Solaris IBM AIX HP Unix

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The old boy first exam question