A systems administrator needs to create a data volume out of four disks with the MOST redundancy. Which of the following is the BEST solution?
Correct Answer:
D
RAID 6 is a type of RAID level that uses two parity blocks to provide fault tolerance and redundancy for data storage. RAID 6 can withstand the failure of up to two disks in the array without losing any data. RAID 6 requires a minimum of four disks to operate, and it distributes the data and parity blocks across all the disks in the array. RAID 6 has a high write penalty, which means that it takes more time and resources to write data to the disks than to read data from them. However, RAID 6 offers a highlevel of data protection and reliability, which makes it suitable for applications that require high availability and durability1.
RAID 1 provides redundancy and fault tolerance by mirroring the data from one disk to another disk. RAID 1 offers high read performance and data security, but it has low capacity and write performance. RAID 1 requires a minimum of two disks to operate, and it can only tolerate the failure of one disk in the array. If more than one disk fails, all the data in the array is lost2.
RAID 5 provides redundancy and fault tolerance by using one parity block to store information that can be used to reconstruct the data in case of a disk failure. RAID 5 requires a minimum of three disks to operate, and it distributesthe data and parity blocks across all the disks in the array. RAID 5 offers a balance between performance, capacity, and data protection, but it can only tolerate the failure of one disk in the array. If more than one disk fails, all the data in the array is lost2.
Therefore, among these options, RAID 6 is the best solution for creating a data volume out of four disks with the most redundancy.
Which of the following is an architectural reinforcement that is used to attempt to conceal the exterior of an organization?
Correct Answer:
C
Camouflage is an architectural reinforcement that is used to attempt to conceal the exterior of an organization. Camouflage is a technique of blending in with the surroundings or disguising the appearance of a building or facility to make it less noticeable or identifiable. Camouflage can reduce the visibility and attractiveness of a target for potential attackers or intruders. References: CompTIA Server+ Certification Exam Objectives, Domain 5.0: Security, Objective 5.1: Given a scenario, apply physical security methods to a server.
Which of the following asset management documents is used to identify the location of a serves within a data center?
Correct Answer:
C
A rack layout is a document that shows the physical location and arrangement of servers and other devices within a rack. It can include information such as server names, IP addresses, power consumption, and cable connections. A rack layout can help identify and locate servers easily and efficiently in a data center. Verified References: [Rack layout], [Data center]
An administrator notices high traffic on a certain subnet and would like to identify the source of the traffic. Which of the following tools should the administrator utilize?
Correct Answer:
D
Application consistent backup is a method of backing up data that ensures the integrity and consistency of the application state. It involves notifying the application to flush its data from memory to disk and quiescing any write operations before taking a snapshot of the data. If the databases were not backed up to be application consistent, they might contain incomplete or corrupted data that cannot be restored properly.
References:
CompTIA Server+ Certification Exam Objectives1, page 12 What is Application Consistent Backup and How to Achieve It2 Application-Consistent Backups3
A technician is working on a Linux server. The customer has reported that files in the home directory are missing. The /etc/ f stab file has the following entry:
nfsserver:/home /home nfs defaults 0 0
However, a df -h /home command returns the following information:
/dev/sda2 10G 1G 9G 10% /home
Which of the following should the technician attempt FIRST to resolve the issue?
Correct Answer:
B
The /etc/fstab file contains the information about the file systems that are mounted automatically at boot time or on demand. The entry nfsserver:/home /home nfs defaults 0 0 indicates that the /home directory on the local server is mounted from the /home directory on a remote server called nfsserver using the NFS protocol. However, the df -h /home command shows that the /home directory is actually mounted from a local partition /dev/sda2, which may not contain the user’s files. This means that the NFS mount failed or was overridden by another mount. To resolve the issue, the technician should attempt to unmount the local partition using umount nfsserver:/home, which will detach the /home directory from /dev/sda2. Then, the technician should try to mount the NFS share again using mount /home, which will attach the /home directory to nfsserver:/home according to the /etc/fstab entry12. Creating a new directory (A) or removing an existing one © would not help, as they would not affect the mount point. Mounting /home (D) without unmounting it first would not work, asit would result in an error that the mount point is busy3. References: 1 https://askubuntu.com/questions/374870/home-directory-not-
being-created 2 https://www.techrepublic.com/article/how-to-properly-automount-a-drive-in-
ubuntu-linux/ 3 https://serverfault.com/questions/587855/cannot-find-home-directory-on- linux-server
