Đề Ôn Tập Môn An Toàn Thông Tin 1 - Có Đáp Án Chi Tiết
Tài liệu ôn tập miễn phí môn An toàn Thông tin 1, cung cấp kiến thức từ cơ bản đến nâng cao về bảo mật thông tin, bảo vệ dữ liệu và an ninh mạng. Tài liệu kèm theo đáp án chi tiết, giúp sinh viên nắm vững các khái niệm, phương pháp bảo mật và chuẩn bị hiệu quả cho kỳ thi môn An toàn Thông tin.
Từ khoá: An toàn thông tin 1đề ôn tập an toàn thông tinbảo mật thông tinôn tập an toàn thông tin miễn phítài liệu an toàn thông tin có đáp ánbảo vệ dữ liệuan ninh mạngđề trắc nghiệm an toàn thông tinkiến thức an toàn thông tinđáp án chi tiết an toàn thông tin
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Câu 30: 0.2 điểmchọn nhiều đáp án
Which of the following changes may occur as a consequence of using the command ip? (Choose three.)
A.
Network interfaces may become active or inactive.
B.
New name servers may be added to the resolver configuration.
C.
The system’s host name may change.
D.
IP addresses may change.
E.
The routing table may change.
Câu 31: 0.2 điểm
What is true about the Hop Limit field in the IPv6 header?
A.
The field is not changed during the transport of a package.
B.
The field is transmitted within a hop-by-hop extension header.
C.
Each router forwarding the packet increases the field’s value.
D.
Each router forwarding the packet decreases the field’s value.
E.
For multicast packages, the field’s value is always 1.
Câu 32: 0.2 điểm
Which command is used to set restrictions on the size of a core file that is created for a user when a program crashes?
A.
core
B.
edquota
C.
quota
D.
ulimit
Câu 33: 0.2 điểm
Which of the following situations is observed and corrected by an NTP client?
A.
The skew in time between the system clock and the computer’s hardware clock.
B.
The physical location and the timezone configuration.
C.
Changes in the time zone of the current computer’s location.
D.
Adjustment needed to support Daylight Saving Time.
E.
The skew in time between the system clock and the reference clock.
Câu 34: 0.2 điểm
What does the term Braille Display refer to?
A.
A standardized high contract graphical theme for desktop applications?
B.
A Linux desktop environment similar to KDE and GNOME.
C.
A legacy display technology superseded by LCD.
D.
A physical representation of characters using small dots.
E.
A standard file format for data exchange, similar to XML.
Câu 35: 0.2 điểm
What information is provided by the echo $$ command?
A.
The process ID of the current shell.
B.
The process ID for the following command.
C.
The process ID of the last command executed.
D.
The process ID of the last command which has been placed in the background.
Câu 36: 0.2 điểm
How does the ping command work by default?
A.
Is sends an ICMP Echo Request to a remote host and waits to receive an ICMP Echo Response in return.
B.
It sends an ARP request to a remote host and waits to receive an ARP response in return.
C.
It sends a TCP SYN packet to a remote host and waits to receive an TCP ACK response in return.
D.
Is sends a broadcast packet to all hosts on the net and waits to receive, among others, a response from thetarget system.
Câu 37: 0.2 điểm
What output does the command seq 1 5 20 produce?
A.
1 5 10 15
B.
1 6 11 16
C.
1 2 3 4
D.
2 3 4 5
Câu 38: 0.2 điểmchọn nhiều đáp án
Which of the following states can NetworkManager show regarding the system’s network connectivity? (Choose two)
A.
up
B.
portal
C.
full
Câu 39: 0.2 điểmchọn nhiều đáp án
Which of the following comparison operators for test work on elements in the file system? (Choose two.)
A.
–z
B.
–eq
C.
–d
D.
–f
E.
–lt
Câu 40: 0.2 điểm
Which command makes the shell variable named VARIABLE visible to subshells?
A.
export $VARIABLE
B.
env VARIABLE
C.
set $VARIABLE
D.
set VARIABLE
E.
export VARIABLE
Câu 41: 0.2 điểm
Which of the following information is stored in /etc/shadow for each user?
A.
The timestamp of the user’s last login
B.
The user’s private SSH keys
C.
The hashed password of the user
D.
The numerical user ID (UID)
E.
The path to the user’s home directory
Câu 42: 0.2 điểmchọn nhiều đáp án
Which of the following fields can be found in the /etc/group file? (Choose two.)
A.
The home directory of the group.
B.
The list of users that belong to the group.
C.
The name of the group.
D.
The default group ACL.
E.
The description of the group.
Câu 43: 0.2 điểm
Which of the following commands can identify the PID od a process which opened a TCP port?
A.
ptrace
B.
strace
C.
debug
D.
lsof
E.
nessus
Câu 44: 0.2 điểm
Which of the following steps prevents a user from obtaining an interactive login session?
A.
Setting the UID for the user to 0.
B.
Running the command chsh –s /bin/false with the user name.
C.
Removing the user from the group staff.
D.
Adding the user to /etc/noaccess.
E.
Creating a .nologin file in the user’s home directory.
Câu 45: 0.2 điểm
Which of the following files assigns a user to its primary group?
A.
/etc/pgroup B. /etc/shadow
B.
/etc/passwd
C.
/etc/group
D.
/etc/gshadow
Câu 46: 0.2 điểm
Which mechanism does ssh use to interact with the SSH agent?
A.
Connecting to port 2222 which is used by the system-wide SSH agent.
B.
Using the fixed socket .ssh-agent/ipc.
C.
Creating an alias replacing ssh with calls to ssh-agent.
D.
Starting ssh-agent as a child process for each ssh invocation.
E.
Evaluating environment variables such as SSH_AUTH_SOCK.
Câu 47: 0.2 điểm
What output is produced by the following command sequence?
A.
echo ‘1 2 3 4 5 6’ | while read a b c; do echo result $c $b $a; done
B.
result: 6 5 4
C.
result: 1 2 3 4 5 6
D.
result: 3 4 5 6 2 1
Câu 48: 0.2 điểm
Which file contains the data of the last change of a user’s password?
A.
/etc/gshadow
B.
/etc/passwd
C.
/etc/pwdlog
D.
/var/log/shadow
E.
/etc/shadow
Câu 49: 0.2 điểm
Which of the following commands sets the system’s time zone to the Canadian Eastern Time?
A.
localegen -t -f /usr/share/zoneinfo/Canada/Eastern > /etc/locate.tz
B.
tzconf /etc/localtime
C.
sysctl -w clock.tz=’Canada/Eastern’
D.
modprobe tz_ca_est
E.
ln -sf /usr/share/zoneinfo/Canada/Eastern /etc/localtime
Câu 50: 0.2 điểm
Which of the following protocols is related to the term open relay?
A.
SMTP
B.
POP3
C.
NTP
D.
IMAP
E.
LDAP
Câu 1: 0.2 điểm
Depending on a system’s configuration, which of the following files can be used to enable and disable network services running on this host?
A.
/etc/profile
B.
/etc/xinetd.conf
C.
/etc/ports
D.
/etc/services
Câu 2: 0.2 điểm
What is true about the following command?
A.
nmcli device wifi connect WIFIoI
B.
NetworkManager opens a new public hotspot with the SSID WIFIoI.
C.
NetworkManager creates an unconfigured new virtual network interface named WIFIoI.
D.
NetworkManager creates a new wifi connection WIFIoI and activates it.
E.
NetworkManager returns an error in case the connection WIFIoI does not exist.
Câu 3: 0.2 điểm
What is true about the file /etc/localtime?
A.
It is a plain text file containing a string such as Europe/Berlin
B.
It is created and maintained by the NTP service based on the location of the system’s IP address.
C.
It is a symlink to /sys/device/clock/ltime and always contains the current local time.
D.
After changing this file, newtzconfig has to be run to make the changes effective.
E.
It is either a symlink to or a copy of a timezone information file such as /usr/share/zoneinfo/ Europe/Berlin.
Câu 4: 0.2 điểm
What information related to a user account is modified using the chage command?
A.
Default ownership for new files
B.
Group membership
C.
Set of commands available to the user
D.
Password expiry information
E.
Default permissions for new files
Câu 5: 0.2 điểm
Which of the following commands puts the output of the command date into the shell variable mydate?
A.
mydate=”date”
B.
mydate=”exec date”
C.
mydate=”$((date))”
D.
mydate=”$(date)”
E.
mydate=”${date}”
Câu 6: 0.2 điểm
Which of the following protocols is designed to access the video card output of a virtual machine?
A.
KDE
B.
X11
C.
Xfce
D.
SPICE
E.
XDMCP
Câu 7: 0.2 điểmchọn nhiều đáp án
Which of the following tasks are handled by a display manager like XDM or KMD? (Choose two.)
A.
Configure additional devices like new monitors or projectors when they are attached.
B.
Start and prepare the desktop environment for the user.
C.
Create an X11 configuration file for the current graphic devices and monitors.
D.
Lock the screen when the user was inactive for a configurable amount of time.
E.
Handle the login of a user.
Câu 8: 0.2 điểm
Why is the correct configuration of a system’s time zone important?
A.
Because the timezone is included in checksum calculations and timezone changes invalidate existingchecksums.
B.
Because the time zone is saved as part of the modification times of files and cannot be changed after a fileis created.
C.
Because the environment variables LANG and LC_MESSAGES are, by default, set according to the time zone.
D.
Because NTP chooses servers nearby based on the configured time zone.
E.
Because the conversion of Unix timestamps to local time relies on the time zone configuration.
Câu 9: 0.2 điểm
Which of the following commands preloads and manages existing SSH keys that are used for automatic authentication while logging in to order machines using SSH?
A.
sshd
B.
ssh-keyring
C.
ssh-keygen
D.
ssh-pki
Câu 10: 0.2 điểm
How can a specific user be prevented from scheduling tasks with at?
A.
By adding the specific user to the /etc/at.allow file.
B.
By adding the specific user to the [deny] section in the /etc/atd.conf file.
C.
By adding the specific user to the nojobs group.
D.
By adding the specific user to the /etc/at.deny file.
E.
By executing the atd --deny[user] command.
Câu 11: 0.2 điểm
Which of the following sections exists in a systemd timer unit?
A.
[Events]
B.
[Timer]
C.
[cron]
D.
[Schedule]
E.
[Trigger]
Câu 12: 0.2 điểm
Which of the following commands lists all defines variables and functions within Bash?
A.
env
B.
export
C.
env -a
D.
set
E.
echo $ENV
Câu 13: 0.2 điểm
What is true regarding the file ~/.forward?
A.
When configured correctly ~/.forward can be used to forward each incoming mail to one or more other recipients.
B.
After editing ~/.forward the user must run newaliases to make the mail server aware of the changes.
C.
Using ~/.forward, root may configure any email address whereas all other users may configure only their own addresses.
D.
As ~/.forward is owned by the MTA and not writable by the user, it must be edited using the editaliases command.
E.
By default, only ~/.forward files of users in the group mailq are processed while all other user’s ~/ .forward files are ignored.
Câu 14: 0.2 điểmchọn nhiều đáp án
What can be specified with useradd? (Choose two.)
A.
Commands the user can run using sudo.
B.
The absolute path to the user’s home directory.
C.
Which printers are available for the new user.
D.
The SSH keys used to login to the new account.
E.
The numeric user ID (UID) of the user.
Câu 15: 0.2 điểm
Which of the following configuration files should be modified to globally set shell variables for all users?
A.
/etc/profile
B.
/etc/bashrc
C.
~/.bash_profile
D.
/etc/.bashrc
E.
/etc/shellenv
Câu 16: 0.2 điểm
Which of the following is a valid IPv6 address?
A.
2001:db8:0g21::1
B.
2001::db8:4581::1
C.
2001:db8:3241::1
D.
2001.db8.819f..1
E.
2001%db8%9990%%1
Câu 17: 0.2 điểmchọn nhiều đáp án
Which of the following keywords can be used in the file /etc/resolv/conf? (Choose two.)
A.
substitute
B.
lookup
C.
search
D.
nameserver
E.
method
Câu 18: 0.2 điểm
Which of the following is true about IPv6?
A.
IPv6 no longer supports broadcast addresses.
B.
With IPv6, the TCP port numbers of most services have changed.
C.
IPv4 addresses can be used without any change with IPv6.
D.
IPv6 no longer supports multicast addresses.
E.
For IPv6, UDP and TCP have been replaced by the Rapid Transmission Protocol RTP.
Câu 19: 0.2 điểm
What is the purpose of TCP wrapper?
A.
Manage and adjust bandwidth used by TCP services.
B.
Bind a network service to a TCP port.
C.
Encapsulate TCP messages in IP packets.
D.
Add SSL support to plain text TCP services.
E.
Limit access to a network service.
Câu 20: 0.2 điểm
Which option in the chrony configuration file changes the initial interval of polls to a NTP server in order to speed up the initial synchronization?
A.
iburst
B.
quickstart
C.
fast
D.
fsync
Câu 21: 0.2 điểm
Which of the following commands shows all active systemd timers?
A.
systemctl-timer show
B.
timectl list
C.
systemctl –t
D.
systemctl list-timers
E.
timeq
Câu 22: 0.2 điểm
Which of the following is true regarding the command sendmail?
A.
With any MTA, the sendmail command must be run periodically by the cron daemon.
B.
When using systemd, sendmail is an alias to relayctl.
C.
The sendmail command prints the MTA’s queue history of which mails have been sent successfully.
D.
It is only available when the sendmail MTA is installed.
E.
All common MTAs, including Postfix and Exim, provide a sendmail command.
Câu 23: 0.2 điểm
On a machine running several X servers, how do programs identify the different instances of the X11 server?
A.
By a fixed UUID that is defined in the X11 configuration file.
B.
By a display name like: 1.
C.
By the name of the user that runs the X server like x11:bob.
D.
By a device name like /dev/X11/xservers/1.
E.
By a unique IPv6 address from the fe80::/64 subnet.
Câu 24: 0.2 điểm
If neither cron.allow nor cron.deny exist in /etc/, which of the following is true?
A.
Without additional configuration, all users may create user specific crontabs.
B.
Without additional configuration, only root may create user specific crontabs.
C.
The cron daemon will refuse to start and report missing files in the system’s logfile.
D.
When a user creates a user specific crontab the system administrator must approve it explicitly.
E.
The default settings of /etc/crond.conf define whether or not user specific crontabs are generally allowed or not.
Câu 25: 0.2 điểm
What information is shown by the echo $? command?
A.
The process ID of the echo command.
B.
The exit value of the command executed immediately before echo.
C.
The process ID which will be used for the next command.
D.
The exit value of the echo command.
Câu 26: 0.2 điểm
Which of the following statements is true regarding systemd timer units?
A.
Timer units can only be defined within a service unit’s file.
B.
The command executed by the timer is specified in the timer unit’s [Cmd] section.
C.
A dedicated system service, systemd-cron, handles the execution of timer units.
D.
Timer units only exist in the system scope and are not available for users.
E.
Each systemd timer unit controls a specific systemd service unit.
Câu 27: 0.2 điểm
Which character in the password field of /etc/passwd is used to indicate that the encrypted password is stored in /etc/shadow?
A.
*
B.
C s
C.
#
D.
E x
Câu 28: 0.2 điểm
How many IP addresses can be used for unique hosts inside the IPv4 subnet 192.168.2.128/26?
A.
6
B.
14
C.
62
D.
126
E.
30
Câu 29: 0.2 điểm
Which of the following commands displays all environment and shell variables?
A.
getargs
B.
lsenv
C.
ls
D.
env
E.
lsshell