A Review Of Practical RH302 samples

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2021 Mar RH302 free practice exam

Q41. CORRECT TEXT

You are giving RHCE exam. Examiner gave you the Boot related problem and told to you that make successfully boot the System. While booting system, you saw some error and stop the boot process by displaying some error messages.

Kernel Panic - not syncing: Attempted to kill init!

And no further boot process. What you will do to boot the system.

Answer and Explanation:

To understand the role of a boot loader, take a step back from Linux. When you boot your computer, the BIOS starts by detecting basic hardware, including your hard drives. Once it's done, it looks for the boot loader on the Master Boot Record of the first available disk. If you're working with an older PC, the BIOS can't find your boot loader unless it's located within the first 1,024 cylinders of the hard disk.

Newer BIOSes overcome this problem with Logical Block Addressing, which is also known as LBA mode. LBA mode reads 'logical' values for the cylinder, head, and sector, which allows the BIOS to 'see' a larger disk drive.

If you have multiple hard drives, there is one more caveat. If your drives are IDE hard drives, the /boot directory must be on a hard drive attached to the primary IDE controller. If your drives are all SCSI hard drives, the /boot directory must be located on a hard drive with SCSI ID 0 or ID 1. If you have a mix of hard drives, the /boot directory must be located on either the first IDE drive or a SCSI drive with ID 0. In other words, this is not an issue on the Red Hat exams unless the computer that you're tested on has more than two hard drives. And I believe that's less likely, as that would increase the cost of the exam.

If you are getting the Kernel panic error, it means it is boot loader related problem. Redhat Enterprise Linux uses the GRUB boot loader. You can pass the kernel parameter from the boot loader as well as you can correct the kernel parameter passing from boot loader from GRUB screen at boot time.

GRUB boot loader configuration file is: /etc/grub.conf

And Correct Configuration is:

default=0

timeout=5

splashimage=(hd0,0)/grub/splash.xpm.gz

hiddenmenu

title Red Hat Enterprise Linux ES (2.6.9-5.EL)

root (hd0,0)

kernel /vmlinuz-2.6.9-5.EL ro root=LABEL=/ rhgb quiet

initrd /initrd-2.6.9-5.EL.img

Probably miss-configured the boot loader, so giving this problem. You can pass the correct parameter from GRUB prompt:

If you know all parameters and sequence of the boot loader you can enter in command prompt also.

Press c on GRUB screen.

Grub> root (hd0,0)

grub> kernel /vmlinuz-2.6.9-5.EL ro root=LABEL=/ rhgb quiet

grub> initrd /initrd-2.6.9-5.EL.img

grub>boot

Q42. CORRECT TEXT

You have a domain in your LAN named example.com. Allow the FTP connection only from local domain.

Answer and Explanation:

1. vi /etc/hosts.deny

vsftpd:ALL EXCEPT .example.com

We can secure the services using tcp_wrappers. There are main two files, /etc/hosts.allow and /etc/hosts.deny.

There will be three stage access checking

-Is access explicitly permitted? Means permitted from /etc/hosts.allow?

- Otherwise, Is access explicitly denied? Means denied from /etc/hosts.deny?

- Otherwise, by default permit access if neither condition matched.

To deny the services we can configure /etc/hosts.deny file using ALL and EXCEPT operation.

Pattern of /etc/hosts.allow and /etc/hosts.deny file is:

Demon_list:client_list:options

In Client list can be either domain name or IP address.

Q43. CORRECT TEXT

Allow the NFS service only to example.com, trusted.cracker.org

Answer and Explanation:

1. vi /etc/hosts.deny

nfs,portmap:ALL EXCEPT .example.com, trusted.cracker.org

We can secure the services using tcp_wrappers. There are main two files, /etc/hosts.allow and /etc/hosts.deny.

There will be three stage access checking

-Is access explicitly permitted? Means permitted from /etc/hosts.allow?

- Otherwise, Is access explicitly denied? Means denied from /etc/hosts.deny?

- Otherwise, by default permit access if neither condition matched.

To deny the services we can configure /etc/hosts.deny file using ALL and EXCEPT operation.

Pattern of /etc/hosts.allow and /etc/hosts.deny file is:

Demon_list:client_list:options

In Client list can be either domain name or IP address.

Q44. CORRECT TEXT

Configure the DNS server by allowing query only from the 192.168.0.0/24 Local Network.

Answer and Explanation:

1. vi /var/named/chroot/etc/named.conf

acl localnet { 192.168.0.0/24; };

options {

allow-query { localnet; };

};

2. service named restart | start

allow-query is a global option on /var/named/chroot/etc/named.conf, specifies an address match list of hosts allowed to query this server. If this option is not set, any host can query the server.

Q45. CORRECT TEXT

Who ever creates the files/directories on /storage group owner should be automatically should be the same group owner of /storage.

Answer and Explanation:

1. chmod g+s /storage

2. Verify using: ls -ld /storage

Permission should be like:

drwxrws--- 2 root sysusers 4096 Mar 16 18:08 /storage

If SGID bit is set on directory then who every users creates the files on directory group owner

automatically the owner of parent directory.

To set the SGID bit: chmod g+s directory

To Remove the SGID bit: chmod g-s directory

Latest RH302 question:

Q46. CORRECT TEXT

Create the user named jane and john.

Answer and Explanation:

1. useradd jane

2. useradd john

useradd command is used to create the user. All user's information stores in /etc/passwd and user;s shadow password stores in /etc/shadow.

Q47. CORRECT TEXT

Raw (Model) printer named printer1 is installed and shared on 192.168.0.254. You should install the shared printer on your PC to connect shared printer using IPP Protocols.

Answer and Explanation:

IPP( Internet Printing Protocol), allows administrator to manage printer through browser so CUPS is called Internet Printing Protocol based on HTTP. We can Install the printer either through:

system-confing-printer tool or through Browser.

1. Open the browser and Type on address: http://localhost:631 àCUPS (Common Unix Printing System) used the IPP protocol. CUPS use the 631 port.

2. Click on Manage Printer.

3. Click on Add Printer.

4. Type Printer name, Location, Description.

5. Select Device for bb. (Select IPP).

6. Device URL: ipp://192.168.0.254/ipp/ queue name àSame printer name of shared printer.

7. Select Model/Driver RAW printer.

8. service cups restart

Q48. CORRECT TEXT

Your system is giving error to load X window System. Make successfully boot your system in runlevel5.

Answer and Explanation:

While you load the X Window System, you will get the problem. Problem may caused by different error.

1. Check the /tmp is full ?

2. Check your quota, hard limit is already crossed ?

3. Check xfs service is running ?

4. Configure the Video card, Resolution, monitor type using: system-config-display (Most Probably in Redhat exam)

5. Edit the /etc/inittab to set default runlevel 5.

id:5:initdefault:

Q49. CORRECT TEXT

You have a domain in your LAN named example.com and cracker.org. Allow the

- Allow the FTP connection only from local domain.

- Deny the FTP connection from cracker.org

Answer and Explanation:

1. vi /etc/hosts.deny

vsftpd:ALL EXCEPT .example.com

1. vi /etc/hosts.deny

vsftpd:ALL

2. vi /etc/hosts.allow

vsftpd:.example.com

We can secure the services using tcp_wrappers. There are main two files, /etc/hosts.allow and /etc/hosts.deny.

There will be three stage access checking

- Is access explicitly permitted? Means permitted from /etc/hosts.allow?

- Otherwise, Is access explicitly denied? Means denied from /etc/hosts.deny?

- Otherwise, by default permit access if neither condition matched.

To deny the services we can configure /etc/hosts.deny file using ALL and EXCEPT operation.

Pattern of /etc/hosts.allow and /etc/hosts.deny file is:

Demon_list:client_list:options

In Client list can be either domain name or IP address.

Q50. CORRECT TEXT

Install the dialog-*

Answer and Explanation:

Questions asking you to install the dialog package from the server. In your Lab FTP server as well as NFS server are configured. You can install either through FTP or NFS.

2021 Mar RH302 free practice exam

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