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NEW QUESTION # 18
Examine the contents of the /etc/exports file on an NFS server:
/status *(rw,async)
/usr/shared/tools *(all-squash,anonuid=501,anongid=501,ro)
/projects/big *(ro) pteam(rw)
The NFS server exports /usr/shared/tools to NFS clients. Which statement is true?
Answer: B
Explanation:
* Option C (Correct):Theall-squashoption in the/etc/exportsfile maps all user and group requests from remote systems to the anonymous user (nfsnobody) on the NFS server. However, because theanonuidandanongidoptions are specified with501, all incoming requests are explicitly mapped to the UID and GID of the unprivileged local user with UID 501 and GID 501. Thero(read-only) option allows all clients to mount/usr/shared/toolsas read-only.
* Option A (Incorrect):This is incorrect because all clients can mount the directory, but all users' requests are squashed to UID 501. There is no exception for local 501 users.
* Option B (Incorrect):The answer is incorrect because it incorrectly states "privileged local 501 user." The UID 501 is typically an unprivileged user.
* Option D (Incorrect):Theall-squashoption does not override the UID and GID explicitly defined byanonuidandanongid. Instead, it maps all remote requests to these values.
* Option E (Incorrect):Theanonuidandanongiddirectives are not ignored; they are explicitly used to map all requests to the specified UID and GID.
Oracle Linux Reference:For more information on NFS exports and options, refer to:
* OracleLinux 8: Managing NFS and NIS
* man exportsfor details on export options.
NEW QUESTION # 19
Which three are features of the btrfs file system?
Answer: B,C,D
Explanation:
* Option B (Correct):Btrfs uses a copy-on-write mechanism for both data and metadata, which ensures that the file system is more resilient to crashes and data corruption.
* Option E (Correct):Btrfs supports online resizing, meaning that you can change the size of a mounted Btrfs file system without unmounting it.
* Option G (Correct):Btrfs automatically defragments files in the background to maintain performance.
* Option A (Incorrect):While Btrfs does support mirroring, it is not strictly block device mirroring in the traditional sense like RAID; it uses a different approach to redundancy.
* Option C (Incorrect):Btrfs is not a cluster file system; it is designed for local file systems.
* Option D (Incorrect):While Btrfs can store small files efficiently, it is not its primary design goal compared to other file systems optimized specifically for small files.
* Option F (Incorrect):Btrfs is a file system with integrated volume management capabilities but is not a general-purpose volume manager like LVM.
Oracle Linux Reference:Refer to:
* OracleLinux 8: Btrfs File System
* man btrfsfor features and management.
NEW QUESTION # 20
Which two features does a user private group provide?
Answer: B,C
Explanation:
* Option A (Correct):A user private group (UPG) ensures that each user has their own unique group created with the same name and ID as the user.
* Option E (Correct):The UPG model helps prevent other users from modifying files by default, as newly created files are assigned to the user's unique group and not to a shared group.
* Option B (Incorrect):UPG does not give the capability to create new group users; this is related to group management commands.
* Option C (Incorrect):UPG does not providesudocapabilities;sudoconfiguration is managed separately.
* Option D (Incorrect):UPGs do not limit reading files to group users by default; it depends on specific file permissions.
Oracle Linux Reference:Refer to:
* OracleLinux 8: Managing Users and Groups
NEW QUESTION # 21
Which command configures a fully functional and accessible interface on VLAN 800?
Answer: D
Explanation:
* Option C (Correct):This command sequence first loads the 802.1q module needed for VLAN tagging, then creates a VLAN interface (eth0.800) on the base interface (eth0), assigns an IP address (10.135.1.120/24), and sets the VLAN interface up.
* Option A, B, D (Incorrect):These options have syntactical errors or missing parameters that make them incorrect for setting up a fully functional and accessible VLAN interface.
Oracle Linux Reference:Refer to:
* OracleLinux 8: Configuring VLANs
NEW QUESTION # 22
Which two commands relabel an SELinux system after a reboot?
Answer: A,E
Explanation:
* Option D (Correct):Creating an empty file named.autorelabelin the root directory tells SELinux to relabel the entire file system during the next reboot.
* Option F (Correct):Thefixfiles -F onbootcommand schedules a full file system relabel on the next reboot.
* Option A, B, C, E (Incorrect):These options do not correctly set the system to relabel on reboot.
Oracle Linux Reference:Refer to:
* OracleLinux 8: SELinux Guide
NEW QUESTION # 23
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