“$ sysctl –a” command. If one wants do display a particular kernel setting then use “sysctl setting name”. In order to change a particular kernel setting following command is used:
“$ sysctl setting name=setting value”

30. What feature differentiate telnet from SSH?
Telnet and SSH are both are the protocols which are used to access a device remotely. The main feature for SSH is that it uses encryption while telnet does not. This feature of SSH makes it secure over the network. Usually the telnet is used on the machine where SSH client is installed.

31. Do you have any idea what are some quirky commands in Linux?
Linux provides some features which give some surprising outputs on the terminal windows. For example $asciiview shows image on …show more content…
Through which command do you take back up?
In order to back up a particular directory and its items, I would like to use rsync command. The basic syntax for using “$ rsync” command is as follows:
#rsync –r src directory dst directory
Above command creates the copy of a source directory to destination directory, recursively. The recursively means all the folders and subfolders are copied to the destination. Furthermore there are also other utilities for taking back up depending upon the required back up e.g. “tar” command is used to take back up of a directory by zipping it first and then unzip the zipped directory to targeted directory.

34. Define Ping? Ever heard about Ping of death attack?
Ping command is used to check the connectivity of a device on the internet. Whether a device is online or not. It is used to check IP level connectivity by sending a ping packet which includes IP header. Normally the size of a ping packet ranges from 56 bytes- 84 bytes. The max size of ping packet which can be read by a device is of 65536 bytes. If ping packet is set greater than this limit then the device will not be able to read it and it will be under attack. This is attack is called ping of death attack as it drags the device into an infinite loop of ping commands