Workbook 2: Hardware

Question 1

Which process types are supported by Red Hat Enterprise Linux?

Answer 1

Intel and AMD x86 32 bit processors, Intel and AMD x86 64 bit processors, IBM s/390 processors, IBM series Z processors

Question 2

The /proc filesystem provides what function?

Answer 2

It provides an interface for humans to view information in the kernel.

Question 3

What is an expected device name for a USB drive on a system ?

Answer 3

/dev/sdb

Question 4

Which file contains a snapshot of the kernel’s dmesg buffer soon after the most recent boot?

Answer 4

/var/log/dmesg

Question 5

Which command displays the current contents of the kernel’s dmesg buffer?

Answer 5

dmesg

Question 6

What command can be used to monitor hardware changed dynamically?

Answer 6

lshal -m

Question 7

In what directory are kernel modules found?

Answer 7

/lib/modules/kernel-version/

Question 8

What command is used to request the removal of a module?

Answer 8

modprobe -r

Question 9

Which of the following would be a conventionally named static kernel image?

Answer 9

/boot/vmlinuz-2.6.32-8

Question 10

Which of the following could be a reason that the module cannot be removed?

Answer 10

The module’s usage count is greater than 0. OR The module is depended on by another module which is in use.

Question 11

What command is used to list all currently inserted kernel modules?

Answer 11

lsmod

Question 12

Which command can be used to request the insertion of a kernel module?

Answer 12

modprobe

Question 13

What configuration file is examined whenever modprobe inserts a module?

Answer 13

/etc/modprobed/*.conf

Question 14

Which file contains values for /proc/sys/ directory entries which are set automatically at boottime?

Answer 14

/etc/sysctl.conf

Question 15

After editing the file mentioned in the previous question, what command can be run to immediately implement the changes?

Answer 15

sysctl -p

Question 16

Within the configuration file mentioned above, which of the following lines would correctly set the value of /proc/sys/net/ipv4/ip_forward to 1?

Answer 16

net.ipv4.ip_forward = 1

Question 17

Which of the following commands conveniently lists all connected PCI devices?

Answer 17

lspci

Question 18

What about the above output implies a misconfiguration of the machine?

Answer 18

None of these conditions necessarily imply problems.

Question 19

Which of the following files lists currently claimed I/O ports?

Answer 19

/proc/ioports

Question 20

Which of the following files lists the physical addresses of currently mapped memory (including RAM and other devices)?

Answer 20

/proc/iomem

Question 21

What I/O port base address(es) is (are) being used by the sound card?

Answer 21

2000 and 2400

Question 22

How much of the video card’s memory has been mapped into the system?

Answer 22

48 megabytes

Question 23

which file lists modules loaded on the system?

Answer 23

/proc/devices

Question 24

What two types of filesystem device nodes exist in Linux?

Answer 24

character and block device nodes

Question 25

Which of the following files is the device node for the CDROM drive?

Answer 25

/dev/sr0

Question 26

Which of the following is the device node for the SCSI disk with a SCSI ID of 3?

Answer 26

Not enough information is provided

Question 27

A USB drive is added to the system. What command must be run to create the device node?

Answer 27

No command needs to be run. udev will create the device node automatically

Question 28

What is the name of the utility which displays a dynamically updated list of processes currently running on the machine, as well as CPU and memory utilization statistics?

Answer 28

top

Question 29

What file contains information about current memory utilization?

Answer 29

/proc/meminfo