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1.Diff between Active and passive FTP?
2.What is anacron?
3.Diff between yum update and yum install while doing for
kernel?
4.root_squash and no_root_squash does what?
5.What are the commands will you execute to find a new hardware?
6.How will you find out a lun allocated from SAN?
7.What is the main diff in CaT5 and CAT6 cable, except the
1/100 and 1/1000?
8.What is stale NFS and How will you fix it?
9.What is kernel panic error?
10.How will you recover password and shadow file, in case
both got deleted. Explain the steps?
11.Explain boot process
12.What is network bonding. Explain the steps?
13.What are the exit codes returned by FSCK?
14.What is LDOM?
15.Diff between block and character device?
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Answer / deepak patil
1# Active mode is beneficial to the FTP Server’s security, while Passive mode typically requires less configuration changes on the Client’s side.
Active mode:Client uses random port to connect to server Port 21 to establish connection.Server then opens data connection from server port 20 to client computer on a random port.
Passive mode:Client uses random port to connect to server Port 21 to establish connection.Client uses random port to open data connection.Server must have this random port open on firewall.Client firewall usually automatically allow whichever port is chosen.
Please do through this link for diagrammatic representation: http://www.serverintellect.com/support/ftp/ftp-active-passive-diff/
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Answer / deepak patil
4# root_squash — Prevents root users connected remotely from having root privileges and assigns them the user ID for the user nfsnobody. This effectively "squashes" the power of the remote root user to the lowest local user, preventing unauthorized alteration of files on the remote server. Alternatively, the no_root_squash option turns off root squashing. To squash every remote user, including root, use the all_squash option.
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