Linux LPI 117-101 # 1 Of 9
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Which file holds information about the IRQ channels in use?
About This Quiz
This quiz, titled 'Linux LPI 117-101 # 1 of 9', assesses knowledge on Linux system hardware configurations. It includes questions on file locations for IRQ channels, I\/O addresses, and specific hardware settings for devices like COM2, crucial for professionals managing Linux systems.
Quiz Preview
- 2.
Which file holds information about the I/O addresses in use?
Explanation
/proc/interrupts holds IRQ channels. /proc/ioports holds I/O memory
addresses.
/proc/dma holds DMA channels.Rate this question:
- 3.
What is the IO Address of the second serial port
- 4.
What is the IRQ of COM2?
Explanation
COM 1 uses an IRQ of 4 and a memory address of 03F8. COM 2 is
assigned to IRQ 3 and a memory address of 02F8.Rate this question:
- 5.
You suspect that a new ethernet card might be conflicting with another device. Which file should you check within the /proc tree to learn which IRQs are being used by which kernel drives?
Explanation
The Linux /proc Directory is a Virtual Filesystem provided by linux kernel. /proc
contains files and directories that let system administrators and programmers access
system information.
The file /proc/interrupts file contains information on interrupts and IRQs. First Ethernet
card device name is eth0, second Ethernet card device name is eth1 ..., to identify that
dev will conflict or not , see the contains of file. Already eth0 is appeared or not ?
Here is the output of /proc/interrupts
CPU0
0: 380893 XT-PIC timer
1: 843 XT-PIC i8042
2: 0 XT-PIC cascade
5: 0 XT-PIC uhci_hcd
8: 1 XT-PIC rtc
11: 48 XT-PIC Intel 82801AA-ICH, eth0
14: 6086 XT-PIC ide0
NMI: 0
ERR: 0
For a multi-processor machine, this _le may look slightly different:
CPU0 CPU1
0: 1366814704 0 XT-PIC timer
1: 128 340 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
8: 0 1 IO-APIC-edge rtc
12: 5323 5793 IO-APIC-edge PS/2 Mouse
13: 1 0 XT-PIC fpu
16: 11184294 15940594 IO-APIC-level Intel EtherExpress Pro
10/100 Ethernet
20: 8450043 11120093 IO-APIC-level megaraid
30: 10432 10722 IO-APIC-level aic7xxx
31: 23 22 IO-APIC-level aic7xxx
NMI: 0
ERR: 0
Appeared Number of CPU, Number of Ethernet card.Rate this question:
- 6.
You wish to configure your soundcard. Type in the name of the Red Hat text/gui application that allows you to set/autodetect the sound card?
Explanation
Sndconfig is a text based tool which sets up the configuration files
you'll need to use a sound card with a Red Hat Linux system. Sndconfig can be used to set the proper sound type for programs which use the /dev/dsp, /dev/audio and
/dev/mixer devices. The sound settings are saved by the aumix and sysV runlevel
scripts. Install sndconfig if you need to configure your sound card.Rate this question:
- 7.
The _____ daemon is needed to establish a PPP link to another computer?
Explanation
On Linux, PPP functionality is split into two parts: a kernel component that handles the low-level protocols (HDLC, IPCP, IPXCP, etc.) and the user space pppd daemon that handles the various higher-level protocols, such as PAP and CHAP. The current release of the PPP software for Linux contains the PPP daemon pppd and a program named chat that automates the dialing of the remote system.Rate this question:
- 8.
What command should you use to find out the version of the pppd daemon you're using
Explanation
PPP is the protocol used for establishing internet links over dial-up
Modems, DSL connections, and many other types of point-to-point links. The pppd
daemon works together with the kernel PPP driver to establish and maintain a PPP
link with another system (called the peer) and to negotiate Internet Protocol (IP)
addresses for each end of the link. Pppd can also authenticate the peer and/or
supply authentication information to the peer. PPP can be used with other network
protocols besides IP, but such use is becoming increasingly rare.Rate this question:
- 9.
What is the name of the point to point protocol daemon that is used when connecting with a modem?
Explanation
On Linux, PPP functionality is split into two parts: a kernel
component that handles the low-level protocols (HDLC, IPCP, IPXCP, etc.) and the
user space pppd daemon that handles the various higher-level protocols, such as
PAP and CHAP. The current release of the PPP software for Linux contains the PPP daemon pppd and a program named chat that automates the dialing of the
remote system.Rate this question:
- 10.
What is the device file and full path for the LPT1 port?
Explanation
LPT1 port usually used to connect the printer having parallel port and
the device name is /dev/lp0. If you have printer with USB port then device name will
be /dev/usb/lp0.Rate this question:
- 11.
Type in just the numeral of the IRQ most likely to conflict on a system that has both a sound card and second LPT port.
Explanation
IRQ 0 - System timer. Reserved for the system. Cannot be changed by a user.
IRQ 1 - Keyboard. Reserved for the system. Cannot be altered even if no keyboard is
present or needed.
IRQ 2 - Cascaded to 9
IRQ 3 - COM 2(Default) COM 4(User)
IRQ 4 - COM 1(Default) COM 3(User)
IRQ 5 - Sound card (Sound Blaster Pro or later) or LPT2(User)
IRQ 6 - Floppy disk controller
IRQ 7 - LPT1(Parallel port) or sound card (8-bit Sound Blaster and compatibles)
IRQ 8 - Real time clock
IRQ 9 - Cascaded to 2
IRQ 10 - Free / Open interrupt / Available / SCSI
IRQ 11 - Free / Open interrupt / Available / SCSI
IRQ 12 - PS/2 connector Mouse / If no PS/2 connector mouse is used, this can be used
for other peripherals
IRQ 13 - ISA / Math Co-Processor
IRQ 14 - Primary IDE. If no Primary IDE this can be changed
IRQ 15 - Secondary IDERate this question:
- 12.
The ____________ command displays ISA plug-and-play devices resource information.
Explanation
pnpdump will scan all the ISA PnP cards, dumping their resource
data to stdout. The resource data is supposed to be a description of the resources
(IO ports, interrupts, DMA channels) that the card would like, or needs, to use to work. It is stored in a small ROM on the card, which can be read as part of the Plug
and Play configuration process.Rate this question:
- 13.
Type in the IO address of device /dev/ttyS3
- 14.
The___________command allows you to view or change serial port configuration.
Explanation
setserial command helps to set or get the Linux Serial Port
Information. setserial is a program designed to set and/or report the configuration
information associated with a serial port. This information includes what I/O port
and IRQ a particular serial port is using, and whether or not the break key should
be interpreted as the Secure Attention Key, and so on.Rate this question:
- 15.
The ________ partition is used for virtual memory.
Explanation
Swap space in Linux is used when the amount of physical memory
(RAM) is full. If the system needsmore memory resources and the RAM is full,
inactive pages in memory are moved to the swap space.While swap space can help
machines with a small amount of RAM, it should not be considered a
replacement for more RAM. Swap space is located on hard drives, which have a slower
access time
than physical memory. Swap space can be a dedicated swap partition (recommended), a
swap file, or a combination of swap partitions and swap files. The size of your swap
should be equal to twice your computer's physical RAM for up to 2 GB of physical
RAM. For physical RAM above 2 GB, the size of your swap should be equal to the
amount of physical RAM above 2 GB. The size of your swap should never less than 32
MB. Using this basic formula, a system with 2 GB of physical RAM would have 4 GB of
swap, while one with 3 GB of physical RAM would have 5 GB of swap.Rate this question:
- 16.
Type in the Variable name of the variable that stores the location of the command line history file. (Type the variable as it would be used on the command line.)
Explanation
There are two types of variable, Shell and environmental variables.
Shell Variables are available on particular shell, whether environmental variables
available on all shells.
HISTSIZE is a environmental Variables containing the value to store number of
commands on history.
You can assign different value to variable. HISTSIZE=0
Some Variable:
HISTFILE: Specifies the files in which history command are stored on logout.
HISTFILESIZE: Specifies the number of commands of history to be saved when the shell
exits.
HISTSIZE: specifies the number of history commands to keep while operating
interactively.Rate this question:
- 17.
What is the full path and filename of the LPT2 port?
Explanation
LPT1 port usually used to connect the printer having parallel port and the device name is /dev/lp0. If you have printer with USB port then device name will
be /dev/usb/lp0. Convention is like, /dev/lp0 LPT1, /dev/lp1 LPT2.Rate this question:
- 18.
Type in the device file including path for the second serial port
Explanation
Serial devices are usually called something like/dev/ttyS1 under Linux.
The utility stty will allow you to interactively view or set the settings for a serial
port; setserial will allow you to control a few extended attributes and configure
IRQs and I/O addresses for non-standard ports..
First Serial Port: /dev/ttyS0
Second Serial Port: /dev/ttyS1Rate this question:
- 19.
Type in the device file and full path to first serial port.
Explanation
Serial devices are usually called something like/dev/ttyS1 under Linux.
The utility stty will allow you to interactively view or set the settings for a serial
port; setserial will allow you to control a few extended attributes and configure
IRQs and I/O addresses for non-standard ports..
First Serial Port: /dev/ttyS0
Second Serial Port: /dev/ttyS1Rate this question:
- 20.
You are building a system administration shell script and always want a particular line to read a file named Certkiller1.txt that exists in the home directory of every user, regardless of who the user is. What would be the full path including the filename for this file, for the current user?
Explanation
The ~ Symbol represent the user's home directory. As well as in linux
system, there is a environmental variable HOME, representing the user's home
directory.So, we can use ~ symbol or $HOME variable.Rate this question:
- 21.
What is the variable name that holds the terminal capabilities variable, which is usually set to vt100? Type the variable exactly as it would be used at the command line.
Explanation
The environment variable TERM should normally contain the type
name of the terminal, console or display-device type you are using. This information
is critical for all screen-oriented programs, including your editor and mailer.Rate this question:
- 22.
Type in the variable name that controls the size of the command line history. (Type the variable as it would be used on the command line.) Answer:
Explanation
There are two types of variable, Shell and environmental variables.
Shell Variables are available on particular shell, whether environmental variables
available on all shells.
HISTSIZE is a environmental Variables containing the value to store number of
commands on history.
You can assign different value to variable. HISTSIZE=0
Some Variable:
HISTFILE: Specifies the files in which history command are stored on logout.
HISTFILESIZE: Specifies the number of commands of history to be saved when the shell
exits.
HISTSIZE: specifies the number of history commands to keep while operating
interactively.Rate this question:
- 23.
What Linux utility allows you to easily configure your Sound Blaster card on Linux?
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Sndconfig
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SoundConf
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Usrconf
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Sysconf
Correct Answer
A. SndconfigExplanation
Sndconfig is a utility that lets you configure your soundcard easily. It was written originally for RedHat Linux, but now it is available for Debian GNU/Linux, too.Rate this question:
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- 24.
Which of the following modems are not supported by Linux (choose all that apply):
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Winmodem
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28.8K modem
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33.6K modem
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56K modem
Correct Answer
A. WinmodemExplanation
As described in Debian's support document, make sure your modem is
not a "winmodem" (a stripped-down modem that's controlled through a Windows
software driver). Second, if at all possible get yourself an external modem. An
external non-winmodem modem presents a lot less headaches trying to set up.
Internal modems basically have three problems. They either; are winmodems, are
likely going to be PCI bus modems (which present driver issues), or they have to be
set up via software - software which is usually only available for Windows.Rate this question:
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- 25.
DNS provides ________ to IP address mappings.
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NETBIOS name
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Host name
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MAC address
Correct Answer
A. Host nameExplanation
DNS is used to map the Hostname to IP address called forward
lookup, IP to hostname called reverse lookup and allows to logically grouped thenetwork.Rate this question:
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- 26.
The first com port on your PC is represented by:
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/dev/ttyS0
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/dev/ttyS1
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/dev/ttySa
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/dev/ttySA
Correct Answer
A. /dev/ttyS0Explanation
Serial devices are usually called something like/dev/ttyS1 under Linux. The utility stty
will allow you to interactively view or set the settings for a serial port; setserial will allow
you to control a few extended attributes and configure IRQs and I/O addresses for
non-standard ports..Rate this question:
-
- 27.
How many devices can be installed on a 16 bit SCSI excluding the controller?
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8
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10
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12
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16
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15
Correct Answer
A. 15Explanation
The controller is counted as one device.Rate this question:
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- 28.
Sndconfig was written originally for which Linux distribution?
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RedHat
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SuSE
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Debian
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Corel
Correct Answer
A. RedHatExplanation
Sndconfig is a utility that lets you configure your soundcard easily. It was written originally for RedHat Linux, but now it is available for Debian GNU/Linux, too.Rate this question:
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- 29.
Which of the following modems cannot be used on linux systems
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ISDN TA
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Cable modems
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Analogue modems
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PCI modems
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Win modems
Correct Answer
A. Win modemsExplanation
Winmodems do not automatically work with Linux, but there is
various groups on the internet that works towards making winmodems work with Linux. Linmodems.org is one worth mentioning.Rate this question:
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- 30.
Which of the following most likely represents a SCSI connector?
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A
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B
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C
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D
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E
Correct Answer
A. C -
- 31.
How many devices excluding the controller can be on an 8 bit SCSI card?
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6
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8
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9
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16
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7
Correct Answer
A. 7Explanation
The controller is counted as one device.Rate this question:
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- 32.
You are running Linux 2.0.36 and you need to add a USB mouse to your system. Which of the following statements is true?
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You need to rebuild the kernel.
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You need to upgrade the kernel.
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You need to load the USB modules for your existing modular kernel.
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USB support is no available in Linux.
Correct Answer
A. You need to upgrade the kernel.Explanation
You'll need a 2.4.0 or in some cases a 2.2.18 kernel for USB to workRate this question:
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- 33.
The lspci command can display information about devices except the following:
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Card bus speed (e.g. 66Mhz)
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Card IRQ settings
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Card vendor identification
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Card AGP rate (e.g. 1x, 2x, 4x)
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Card Ethernet MAC address
Correct Answer
A. Card Ethernet MAC addressExplanation
lspci is a utility for displaying information about all PCI buses in the system and all
devices connected to them. To display the MAC address of Ethernet, we use the ifconfig
command.Rate this question:
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- 34.
COM2 normally uses what I/O port and IRQ combination?
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03F8 4
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02F8 3
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03E8 4
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02E8 3
Correct Answer
A. 02F8 3Explanation
COM 1 uses an IRQ of 4 and a memory address of 03F8. COM 2 is
assigned to IRQ 3 and a memory address of 02F8.Rate this question:
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- 35.
How many SCSI ids for peripherals can SCSI-1 support? Explanation:
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5
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6
-
7
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8
Correct Answer
A. 7Explanation
SCSI-1 support total 7 peripherals. There are several different types of SCSI
devices. The original SCSI specification is commonly referred to as SCSI-1. The
newer specification, SCSI-2, offers increased speed and performance, as well as new
commands. Fast SCSI increases throughput to more than 10MB per second.
Fast-Wide SCSI provides a wider data path and throughput of up to 40MB per
second and up to 15 devices. There there are Ultra-SCSI and Ultra-Wide-SCSIRate this question:
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- 36.
What is the typical name for the first serial port, (com1)?
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/dev/com0
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/dev/com1
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/dev/ttySO
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/dev/ttyS1
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None of the above
Correct Answer
A. /dev/ttySOExplanation
Serial devices are usually called something like /dev/ttyS1 under Linux. The utility stty will allow you to interactively view or set the settings for a
serial port; setserial will allow you to control a few extended attributes and
configure IRQs and I/O addresses for non-standard ports.
Device name for first Serial Port is /dev/ttyS0.Rate this question:
-
- 37.
What is used by Sndconfig to detect common soundcards (choose all that apply):
-
Isapnp
-
Pcipnp
-
Usbpnp
-
None of the choices
Correct Answer
A. IsapnpExplanation
Sndconfig uses isapnp to detect common soundcards and writes a isapnp configuration to and module control lines for use with your sound card. It requires a kernel with OSS sound modules to be present.Rate this question:
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- 38.
Which of the following Linux packages can be used for web caching?
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Qmail
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Squid
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Apache
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Samba
Correct Answer
A. SquidExplanation
proxy caching server. squid is a high-performance proxy caching server for web clients, sup-porting FTP, gopher, and HTTP data objects. Unlike traditional caching software, squid handles all requests in a single, non-blocking,
I/O-driven process. squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups,
supports non-blocking DNS lookups, and implements negative caching of failed requests.
squid supports SSL, extensive access controls, and full request logging. By using the lightweight Internet Cache Protocol, squid caches can be arranged in a hierarchy or mesh for additional bandwidth savings. Squid program belongs to squid package. To install squid package. In redhat: rpm -ivh squid-version to install the squid.Rate this question:
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- 39.
The modem speed setting of _________ may be too high only if your computer doesn't have a 16550 UART chip.
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115200
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56700
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38400
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28800
Correct Answer
A. 115200Explanation
Explanation: As described in Debian's support document, the speed setting of 115200 may be too high only if you have a 486 computer that doesn't have a 16550
UART chip. If you're using a 486 and not sure of the UART, play it safe and set the speed to 56700 instead. Exit the ee editor saving the file.Rate this question:
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- 40.
A typical I/O address for a sound card is:
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IRQ 7
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0x220
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27210
-
COM2
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0xd800
Correct Answer
A. 0x220Explanation
Only B and E is hexadecimal I/O addresses and of these two the 0x220 is normally used by a soundcard.Rate this question:
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- 41.
You run out of space and added an eighth disk to your SCSI-1 system. When you try to start, the system no longer boots. What is most likely the cause of this problem?
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SCSI-1 supports only 8 devices including the adaptor.
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SCSI-1 supports only 6 disks per adaptor.
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There is a SCSI-ID conflict that causes that problem.
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You forgot to set the SCSI-ID #8 for the new disk.
Correct Answer
A. SCSI-1 supports only 8 devices including the adaptor. -
- 42.
You have a USB storage device that you cannot get working. You have enabled all appropriate USB options in the latest 2.2 kernel but still cannot get your device working. What is the most likely cause of the problem?
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You have not configured your usb.usermap properly.
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You are using the wrong kernel for this type of device.
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The USB device is not USB 2.O compliant.
-
There is a USB resource conflict.
Correct Answer
A. You are using the wrong kernel for this type of device.Explanation
You'll need a 2.4.0 or in some cases a 2.2.18 kernel for USB to workRate this question:
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- 43.
For isapnp to successfully detect your sound card, your system must:
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Have a kernel with the OSS sound modules ready
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Have a sound card chip with the OSS sound modules ready
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Have the on board sound module disabled
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None of the choices.
Correct Answer
A. Have a kernel with the OSS sound modules readyExplanation
Sndconfig uses isapnp to detect common soundcards and writes a isapnp configuration to and module control lines for use with your sound card. It requires a kernel with OSS sound modules to be present.Rate this question:
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- 44.
Your system allows only two serial ports to be active. You want to setup an internal ISA modem. Currently the serial port 1 is used by a mouse. What should you do?
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Disable the second serial port in the BIOS and set the modem up to take its place.
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Enable the second serial port in the BIOS and set the modem up without a port.
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Disable the second serial port in the BIOS and set the modem up to run as port 3.
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None of the choices.
Correct Answer
A. Disable the second serial port in the BIOS and set the modem up to take its place.Explanation
As described in Debian's support document, newer systems will come
with either one or two serial ports which are built into the motherboard. These are
typically 9-pin male connectors on the back of the PC. You can simply connect an
external modem to one of these. If you add an internal modem to the system it has to
be set up as the next serial port (for example number 3 in a system that has two of
them built in). Or, if you system BIOS allows it, you could disable the second serial
port and set the modem up to take its place.Rate this question:
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- 45.
Which of the following is the ppp configuration file?
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/etc/ppp/peers/provider
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/etc/ppp/provider
-
/etc/peers/ppp
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/ppp/peers/provider
Correct Answer
A. /etc/ppp/peers/providerExplanation
As described in Debian's support document, /etc/ppp/peers/provider is the ppp configuration file. You edit it by typing in:
cd /etc/ppp/peers<
tee providerRate this question:
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- 46.
Which of the following device files would represent a USB disk?
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/dev/sda
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/dev/scsia
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/dev/hda
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/dev/sd0
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/dev/scsi0
Correct Answer
A. /dev/sdaExplanation
Linux Treat the USB disk as a SCSI. So, It's device name is sda, sdb....
To use USB Disk we should mount : mount /dev/sda /mnt/usb
Similarly IDE Harddisk will represent by :
Primary Master : /dev/hda
Primary Slave : /dev/hdb
Secondary Master : /dev/hdc
Secondary Slave : /dev/hdd
Floppy Disk represent by : /dev/fd0, fd1,...Rate this question:
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- 47.
In the BIOS, what setting should you disable so that your devices have the best chance of being recognized on boot-up?
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AGP Fast Write
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PnPOS
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ACPI Support
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Power Management/APM
Correct Answer
A. ACPI SupportExplanation
ACPI (Advanced Configuration and Power Interface) is an open industry
specification co-developed by Hewlett-Packard, Intel, Microsoft, Phoenix, and
Toshiba. ACPI establishes industry-standard interfaces enabling OS-directed
configuration, power management, and thermal management of mobile, desktop,
and server platforms.Rate this question:
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- 48.
To set up a connection to your ISP via your modem, what should you do (choose all that apply):
-
Configure the dialer
-
Configure the PPP settings
-
Configure the pppd daemon
-
Configure the PPTP settings
Correct Answer(s)
A. Configure the dialer
A. Configure the PPP settings
A. Configure the pppd daemonExplanation
Explanation: As described in Debian's support document, there are actually two
parts to setting up a connection to your ISP. You have to configure the dialer (the
chat program), and the PPP (Point-to-Point Protocol) settings (the pppd daemon).
PPP is the protocol that modems use to communicate over a serial link. (PPP is a
powerful protocol that is also often used when connecting distant routers over
dedicated leased lines.)Rate this question:
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- 49.
You have a SCSI system with five SCSI hard disks. You add another SCSI hard disk to your system and the system no longer boot, nor is the bootloader loaded. What is the most likely cause of this problem?
-
There are too many devices on the chain.
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The boot disk needs a different SCSI ID
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The new disk is conflicting with the SCSI adapter.
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The new SCSI drive is conflicting with the IDE boot drive.
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The new SCSI drive needs a different SCSI ID.
Correct Answer
A. The new SCSI drive needs a different SCSI ID.Explanation
Probably there is a scsi id conflict caused by the new drive having the same scsi id as an existing drive already had. Change the SCSI ID on the new drive to solve the problem.Rate this question:
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