Is3440 Week 4 Online Class

In: Computers and Technology

Submitted By jecder
Words 701
Pages 3
Part 1

• What is the command to view the current Linux Kernel parameters?
/etc/sysctl.conf

• What command can you run to list all the kernels available parameters one screen at a time with the ability to move forward and backwards on the output?
| less or | more

• What is the purpose of enabling syncookies in the Linux Kernel?
Either allow cookies or disabling cookies where syncookies are the chosen initial TCP sequence

• When you want to enable a Linux Kernel command and enable it immediately without a physical re-boot of the system, what command must you enable in front of the command parameter? Explain what the following command will do : echo “1” > /proc/sys/net/ipv4/ip_forward
Enable ip forwarding with out rebooting, will not stay after a reboot though.

• If you wanted to limit the number of files that a user can open simultaneously on the Fedora Core Linux Server to a maximum of 1, what is the command syntax you need to enable in the Linux Kernel? su -c 'sysctl -w fs.file-max=1

• What is the best way to make a system-wide permanent change to the kernel to enable syncookies? open /etc/sysctl.conf in text editer, then change the value of net.ipv4.tcp_syncookies = 0 to 1, :wq

• Given a system that has been freshly installed your boss wants you to make sure it is up to date and locked down at the Kernel level. What steps would you take to verify what modules are loaded into the Kernel and how would you go about locking them down? verify with cat /proc/modules lock down with $ /etc/init.d/sshd stop

• What would you enable to set the Kernel to debug mode? Why would someone choose to enable this?
Config_Debugsym. for debugging and kernel development

• What is the relation between sysctl.conf and the sysctl command?
Systl to view parameters of the configured settings for the running kernel which is sysctl.conf

• If you wanted…...

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