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Thursday, June 28, 2007

System administration in Linux Interview Questions

Here are 10 interview questions on System administration and Linux . You will see 10 new Interview Questions posted every hour today. I have more than 100 Interview questions to share with you but Keep reading this whole blog to get the maximum knowledge to Win any Software or Storage or System administration or Networking Job.

1.What is the best RAID level?
RAID 0 for performance
RAID 5 for High availability
RAID 6 even better HA if the budget is fine

2.What is MAC address and How to check the MAC address in linux?
A mac address means media access control address.It is a unique address assigned to almost all networking hardware such as Ethernet cards, router etc.
Most layer 2 network protocols use one of three numbering spaces which are designed to be globally unique.

Linux Command to see MAC address:
Ifconfig is used to configure network interfaces.
$ /sbin/ifconfig | grep HWaddr

Output: eth0 Link encap:Ethernet HWaddr 00:0F:EA:91:04:07

OR
$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:0F:EA:91:04:07 <<< THIS IS THE MAC ADDRESS
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20f:eaff:fe91:407/64 Scope:Link

OR as a root user type following command:
# grep eth0 /var/log/dmesg

eth0: RealTek RTL8139 at 0xc000, 00:0f:ea:91:04:07, IRQ 18 <<< this line 2 component from this side is MAC address
eth0: Identified 8139 chip type 'RTL-8100B/8139D'
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1

3.how to assign a permanent IP to a client which is presently in DHCP in Linux?
/sbin/ifconfig eth0 192.168.10.1 netmask 255.255.255.0 broadcast 192.168.10.255
In this command we are assigning 192.168.10.1 IP to ethernet interface(NIC card) eth0.

Also in redhat linux terminal you can type comand "setup" & launch a Wizard type interface in which u can choose network & configure IP

You can use the GUI tool /usr/bin/neat - Gnome GUI network administration tool. It handles all interfaces and configures for both static assignment as well as dynamic assignment using DHCP.

4. How to exclude some ip address range in DHCP?

5.How to resolve data from primary DNS to Secondary DNS ?

6.What is the default serial number of DNS ?

7.how to pull the data to the secondary nis server from master server?

8.what file need to be changed in nis client if you are changing the machine from one subnetwork to other subnetwork?

9.how to see memory usage?
Commands "top" and "free -m"

10.how to increase the filesystem ?
Using command # fdisk

Personalised training in Storage and Linux administration

I am doing personalised training for few students & these are the topics I have assigned to 5 of my students to prepare. I thought of sharing these with you so you know how YOU can prepare for Storage interviews.

I will keep posting about the topics they are covering each week which includes Storage topics as well as some important topics on Linux as well. These are important ones for interviews as well as for building a strong knowledge base.

Neil : SCSI, iSCSI and Linux Daemons

Mack : Fibre Channel (FC) and Linux installation (Importance on Partitioning,Network configurations,Firewall Configurations,Package installation/selection)

Nohel :RAID(Redundant Array of Independent Disks) and Storage related commands in Linux

Arahan : SAN(Storage Area Network) , SNMP (Simple Network Management Protocol) and Boot Process in Linux and Solaris

I will keep writing about their progress & also will publish some of their interview questions & answers on these topics.
If you are interested to get personalised training from me it is going to cost $240.It seems high but I do give more than 2months continous email support, share lots of compressed materials and give info on job openings.

For those who want outlines for their own job preparation I will email you FREE suggestion if you support me. How ? Email 5 of your friends about this blog with the link to this blog & dont forget to include roger.smithson@gmail.com in CC. Also send your ORIGINAL(not copied from web) interview experiences or troubleshooting steps or any IT related experience & I will do my best to support you in your career quest.

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Answer these questions and Get Job Interview

Answer below questions in an email to roger.smithson@gmail.com(I will publish your answers on this blog) and I will help You Get a Job Interview. I will do all the tricks & necessary things to get you a Job Interview from a company of your interest.You will also get lots of necessary materials for your Intervew.
So email your answers for below questions. I just want to publish people's experiences related to their Software Job or Storage technology job hunting on this blog hence I am giving this offer.

0. What is your Present Job Designation & Area of expertise ?

1. What are the responsibilities you are given in this present Job

2. Describe how will be your regular week day, what are the tasks you do

3. What are your Career plans

4. How did you get this Job

5. How was your Interview for this Job

6.Can you tell some of your Interview Questions

7. How many interviews you attended & if its ok can u mention the company names & Job roles

8. What is your present salary now

9. Can you describe any challenging tasks/troubleshooting you have done recently. If you can write with steps,commands that will be great

10. How would you plan to start your interview preparation for next job if you are interested?

11. What are the job roles you are aiming for

12. What is the salary you are expecting in your next job?

13. What you think you will be required in terms of guidance to reach a Better Career.


14. What are some of the good links you liked on this Storage Jobs Blog


15. What is your Suggestion for someone who is searching for a Job

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