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NEW QUESTION # 49
Which of the following can be implemented with PAM to detect and block dictionary attacks?
Answer: D
Explanation:
Pluggable Authentication Modules (PAM) provide a flexible, centralized mechanism for managing authentication across various services in a Linux system. According to the CompTIA Linux+ V8 security domain, protecting against " dictionary attacks " and " brute-force " attempts is a critical hardening step. A dictionary attack involves an automated script attempting thousands of common passwords against a user account.
To mitigate this, administrators use pam_tally2 (or the newer pam_faillock on some systems). The pam_tally2 module is specifically designed to keep track of failed login attempts for each user. It can be configured in the PAM stack (such as /etc/pam.d/common-auth or /etc/pam.d/password-auth) to lock an account after a specified number of consecutive failed attempts (e.g., deny=5). Once the threshold is reached, the user is blocked from further attempts for a set period or until an administrator manually resets the counter. This effectively stops automated dictionary attacks from continuing indefinitely.
The other options serve different purposes. pam_limits (Option B) is used to set resource limits (like CPU time or number of open files) for users once they are already logged in. pam_unix (Option C) is the standard module for traditional /etc/passwd and /etc/shadow authentication. pam_ldap (Option D) allows the system to authenticate against a remote LDAP directory.
While these modules are part of the PAM ecosystem, only pam_tally2 is designed for tracking and acting upon failed login counts to block attacks.
NEW QUESTION # 50
A junior system administrator removed an LVM volume by mistake.
INSTRUCTIONS
Part 1
Review the output and select the appropriate command to begin the recovery process.
Part 2
Review the output and select the appropriate command to continue the recovery process.
Part 3
Review the output and select the appropriate command to complete the recovery process and access the underlying data.
Answer:
Explanation:
Explanation:
Part 1 - Begin the recovery process
The answer:
vgcfgrestore vg01 -f /etc/lvm/archive/vg01_00001-810050352.vg
Part 2 - Continue the recovery process
The answer:
lvchange -ay /dev/vg01/lv01
Part 3 - Complete recovery and access data
The answer:
mount /dev/vg01/lv01 /important_data
This performance-based question tests LVM recovery, a critical System Management skill in CompTIA Linux+ V8. The scenario indicates that a logical volume was removed, but the underlying physical volume and volume group metadata still exist.
# Part 1: Restoring Volume Group Metadata
The first screenshot shows that:
* Physical volumes (pvdisplay, pvs) still exist
* The logical volume is missing
* /etc/lvm/archive/ contains archived VG metadata
Linux automatically stores backups of LVM metadata in /etc/lvm/archive whenever changes are made. The correct first step is to restore the volume group metadata using:
vgcfgrestore vg01 -f /etc/lvm/archive/vg01_00001-810050352.vg
This restores the logical volume definitions but does not activate them yet.
This is the only correct starting point in Linux+ V8 recovery workflows.
# Part 2: Activating the Logical Volume
After metadata restoration:
* The LV exists but is inactive
* blkid shows the LV as TYPE="LVM2_member"
The logical volume must be activated before it can be mounted:
lvchange -ay /dev/vg01/lv01
This makes the LV available under /dev/vg01/lv01.
Linux+ explicitly requires LV activation after recovery.
# Part 3: Accessing the Data
The final output shows:
* The filesystem type is xfs
* The logical volume is now visible
Since there is no indication of filesystem corruption, no repair is required.
The correct final step is to mount the filesystem:
mount /dev/vg01/lv01 /important_data
This restores full access to the underlying data.
NEW QUESTION # 51
A Linux administrator updates the DNS record for the company using:
cat /etc/bind/db.abc.com
The revised partial zone file is as follows:
ns1 IN A 192.168.40.251
ns2 IN A 192.168.40.252
www IN A 192.168.30.30
When the administrator attempts to resolve www.abc.com to its IP address, the domain name still points to its old IP mapping:
nslookup www.abc.com
Server: 192.168.40.251
Address: 192.168.40.251#53
Non-authoritative
Name: www.abc.com
Address: 199.168.20.81
Which of the following should the administrator execute to retrieve the updated IP mapping?
Answer: A
Explanation:
This scenario represents a classic DNS troubleshooting situation covered in the Troubleshooting domain of the CompTIA Linux+ V8 objectives. Although the DNS zone file has been updated correctly on the BIND server, the system continues to resolve the domain name to an outdated IP address. This behavior strongly indicates DNS caching rather than a configuration error in the zone file itself.
Modern Linux systems that use systemd-resolved cache DNS responses locally to improve performance and reduce external queries. Even after a DNS record is updated on the authoritative server, cached results may persist until the cache expires or is manually cleared.
The nslookup output showing a non-authoritative answer further confirms that the response is being served from a cache rather than directly from the updated zone data.
The correct solution is to flush the local DNS cache so the system can retrieve the updated record from the DNS server. The command resolvectl flush-caches clears all cached DNS entries maintained by systemd-resolved, forcing fresh queries to authoritative name servers. This aligns directly with Linux+ V8 documentation for resolving name resolution inconsistencies caused by stale cache entries.
NEW QUESTION # 52
Which of the following commands is used to verify whether a port is open on a remote host?
Answer: B
Explanation:
The nc command can initiate a connection to a specific port on a remote host, making it useful for verifying whether that port is open and reachable over the network.
NEW QUESTION # 53
An administrator receives a report that a user is unable to execute the run report utility that is used to generate weekly reports. The administrator logs in as the user to verify the issue, runs the following commands, and receives the following output:
Which of the following best describes the issue and how to resolve it?
Answer: D
Explanation:
The runreports script exists in /usr/local/bin and has execute permissions, but /usr/local/bin is missing from the user's PATH. Because the shell cannot find the command by name, adding
/usr/local/bin to the user's shell startup configuration resolves the issue.
NEW QUESTION # 54
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