Lpi 102-500日本語 問題集

質問 1：
どのファイルが存在すると、root以外のすべてのユーザーがシステムにログインできなくなりますか？ （パスを含むファイルのフルネームを指定してください。）
正解：
etcnologin
Explanation:
The /etc/nologin file is used to prevent all users except root from logging into the system. This file is usually created by the system administrator when the system is going down for maintenance or reboot. The file can contain a message that is displayed to the users who try to log in, explaining the reason for the system shutdown. The file is automatically removed by the system when it boots up again. Reference:
LPI 102-500 Exam Objectives, Topic 104: Administrative Tasks, 104.5 Manage user accounts LPI 102-500 Study Guide, Chapter 4: User and Group Management, Section 4.3: Preventing Users from Logging In

質問 2：
IPv6では、ユニキャストアドレスのインタフェース識別子に何ビット使用されていますか？ （数字のみで番号を指定してください。）
正解：
64
Explanation:
With IPv6, the interface identifier of an unicast address is typically a 64-bit value that is used to identify a host's network interface. The interface identifier can be derived from the MAC address of the network card, or it can be randomly generated or manually configured. The interface identifier is the rightmost 64 bits of the most commonly encountered address types, such as global unicast (2000::/3) and link-local (fe80::/10). The interface identifier is different from the network prefix, which is the leftmost bits of the address that indicate the network or subnet to which the host belongs. The network prefix can vary in length, depending on the address type and the subnetting scheme. The network prefix and the interface identifier are separated by a double colon (::) in the IPv6 address notation. For example, in the address 2001:db8:1234:5678:abcd:ef12:3456:7890, the network prefix is 2001:db8:1234:5678 and the interface identifier is abcd:ef12:3456:7890. Reference: https://study-ccna.com/ipv6-interface-identifier/
https://networklessons.com/ipv6/ipv6-eui-64-explained

質問 3：
HTTPS サービスで使用される標準化された TCP ポートはどれですか?
A. 80
B. 25
C. 443
D. 636
E. 8080
正解：C

質問 4：
スクリーン リーダーの目的は何ですか?
A. 電子書籍を含むファイルを管理および表示します。
B. 視覚障害者向けに画面に表示されるテキストを読み上げます。
C. 速読テクニックを使用するのに役立つ線とマーカーが表示されます。
D. 接続されたモニターのパラメーターを読み取り、適切な X11 構成を作成します。
正解：B
解説: (Topexam メンバーにのみ表示されます)

質問 5：
空欄を埋めてください
________ コマンドは、システムにグループを追加するために使用されます。
正解：
groupaddusrsbingroupadd
Explanation:
The groupadd command creates a new group using the options specified on the command line and the default values from the /etc/login.defs file. It adds an entry for the new group to the /etc/group and /etc/gshadow files. Only the root user or a user with sudo privileges can create new groups using this command. The general syntax for the groupadd command is as follows:
groupadd [OPTIONS] GROUPNAME
Some of the common options for the groupadd command are:
-g, --gid GID: Specify the numeric group ID for the new group. If not given, the system will assign the next available GID from the range of group IDs specified in the login.defs file.
-r, --system: Create a system group with a GID chosen from the range of system group IDs specified in the login.defs file. System groups are usually used for some special system operation purposes, like creating backups or doing system maintenance.
-f, --force: Suppress the error message if the group already exists and exit successfully. This option is useful for scripts that need to ensure the existence of a group.
-K, --key KEY=VALUE: Override the default values from the /etc/login.defs file. The valid keys are GROUP_MIN_ID, GROUP_MAX_ID, SYS_GROUP_MIN_ID, SYS_GROUP_MAX_ID, and GID_INCREMENT.
Reference:
https://linuxize.com/post/how-to-create-groups-in-linux/
https://linuxhandbook.com/groupadd-command/