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| Section | Objectives |
|---|---|
| Topic 1: The Power of the Linux Command Line | - Introduction to Shell and Scripting Concepts - Basic Commands and Utilities - Working with Text Streams |
| Topic 2: Finding Your Way on a Linux System | - Command Line Basics - Filesystem Navigation - File and Directory Operations |
| Topic 3: The Linux Community and a Career in Open Source | - Open Source Software and Licensing - Linux Evolution and Popular Operating Systems - ICT Skills and Working in Linux - Major Open Source Applications |
| Topic 4: Security and File Permissions | - File Permissions and Ownership - Basic Security Concepts - Users and Groups |
| Topic 5: The Linux Operating System | - Package Management Basics - Processes and System Resources - Operating System Components |
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質問 # 65
Which of the following commands adds thedirectory/new/dir/to thePATHenvironment variable?
正解：A
質問 # 66
What is the primary purpose of a firewall in a basic Linux security context?
正解：B
質問 # 67
What is the preferred source for the installation of new applications in a Linux based operating system?
正解：E
解説：
Explanation/Reference:
質問 # 68
Which files are the source of the information in the following output? (Choose two.) uid=1000 (bob) gid=1000 (bob) groups=1000 (bob), 10 (wheel), 150 (docker), 1001 (libvirt)(wireshark),989
正解：C、D
解説：
Explanation
The files /etc/passwd and /etc/group are the source of the information in the following output:
uid=1000 (bob) gid=1000 (bob) groups=1000 (bob), 10 (wheel), 150 (docker), 1001 (libvirt) (wireshark), 989 The /etc/passwd file contains information about user accounts, such as the username, password, user ID (UID), group ID (GID), full name, home directory, and login shell1. The /etc/group file contains information about groups, such as the group name, password, group ID (GID), and members2.
The output shows the UID, GID, and group membership of the user bob. The UID and GID of bob are 1000, which can be found in the /etc/passwd file. The groups that bob belongs to are bob, wheel, docker, libvirt, wireshark, and 989, which can be found in the /etc/group file. The group names are shown in parentheses after the GID, except for the last group, which has no name.
The other options are not files that store user and group information in Linux. The /etc/id file does not exist by default. The /home/index file is not a standard file and has no relation to user and group information. The
/var/db/users file is not a standard file and has no relation to user and group information. References:
* Linux Essentials Exam Objectives, Version 1.6, Topic 103.1, Weight 2
* Linux Essentials Certification Guide, Chapter 3, Page 51-52
* Linux Filesystem Hierarchy, Chapter 3, Page 17-18
* Linux Users and Groups, Chapter 2, Page 9-10
質問 # 69
Reverse DNS assigns hostnames to IP addresses. How is the name of the IP address 198.51.100.165 stored on a DNS server?
正解：B
解説：
Reverse DNS lookups query DNS servers for a PTR (pointer) record; if the server does not have a PTR record, it cannot resolve a reverse lookup. PTR records store IP addresses with their segments reversed, and they append ".in-addr.arpa" to that. For example, if a domain has an IP address of 192.0.2.1, the PTR record will store the domain's information under 1.2.0.192.in-addr.arpa. In IPv6, the latest version of the Internet Protocol, PTR records are stored within the ".ip6.arpa" domain instead of ".in-addr.arpa."1 Therefore, the name of the IP address 198.51.100.165 is stored in the PTR record for 165.100.51.198.in-addr.arpa. Reference: 1: Reverse DNS lookup - Wikipedia 1
質問 # 70
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