- (Topic 1)
A systems administrator is configuring a storage array.
Which of the following should the administrator configure to set up mirroring on this array?
Correct Answer:
B
RAID 1 is a type of RAID level that creates an exact copy or mirror of data on two or more disks. RAID 1 can provide redundancy and fault tolerance, as it can survive the failure of one disk without losing any data. RAID 1 can also improve read performance, as it can access data from multiple disks simultaneously. The administrator should configure RAID 1 to set up mirroring on a storage array. References: CompTIA Cloud+ Certification Exam Objectives, page 9, section 1.4
- (Topic 2)
A systems administrator has migrated a web application to the cloud with a synchronous uplink speed of 100Mbps. After the migration, the administrator receives reports of slow connectivity to the web application. The administrator logs into the firewall and notices the WAN port is transmitting at a constant 12.5MBps. Which of the following BEST explains the
reason for the issue?
Correct Answer:
D
Not enough upload bandwidth is what best explains the reason for slow connectivity to a web application that has been migrated to a cloud environment with a synchronous uplink speed of 100Mbps. Bandwidth is a measure of how much data can be transferred over a network or connection in a given time period. Upload bandwidth is a measure of how much data can be sent from one location to another over a network or connection in a given time period. Upload bandwidth can affect connectivity to a web application by determining how fast data can be uploaded from clients to servers or vice versa. Not enough upload bandwidth can cause slow connectivity to a web application by creating congestion or bottleneck in data transfer, which may result in delays or errors in web requests or responses.
- (Topic 4)
A systems administrator is selecting the appropriate RAID level to support a private cloud with the following requirements:
. The storage array must withstand the failure of up to two drives.
. The storage array must maximize the storage capacity of its drives.
Which of the following RAID levels should the administrator implement?
Correct Answer:
D
RAID stands for Redundant Array of Independent Disks, which is a technology that combines multiple physical disks into a logical unit that provides improved performance, reliability, and storage capacity. RAID levels are different ways of organizing and distributing data across the disks in a RAID array. Each RAID level has its own advantages and disadvantages, depending on the requirements and trade-offs of the system.
RAID 6 is a RAID level that uses block-level striping with double parity. This means that data is divided into blocks and distributed across all the disks in the array, and two sets of parity information are calculated and stored on different disks. Parity is a method of error detection and correction that can reconstruct the data in case of disk failure. RAID 6 can withstand the failure of up to two disks without losing any data, which makes it suitable for a private cloud that requires high fault tolerance. RAID 6 also maximizes the storage capacity of its drives, as it only uses two disks for parity and the rest for data. The storage capacity of a RAID 6 array is equal to (n-2) x S, where n is the number of disks and S is the size of the smallest disk.
RAID 0, RAID 1, RAID 5, and RAID 10 are other RAID levels, but they do not meet the requirements of the private cloud. RAID 0 uses striping without parity, which improves performance but does not provide any redundancy or fault tolerance. RAID 0 cannot withstand any disk failure, as it would result in data loss. RAID 1 uses mirroring, which copies the same data to two or more disks. RAID 1 provides high reliability and fast read performance, but it wastes half of the storage capacity for redundancy. RAID 1 can only withstand the failure of one disk in each mirrored pair. RAID 5 uses striping with single parity, which distributes data and parity across all the disks in the array. RAID 5 provides a balance of performance, reliability, and storage capacity, but it can only withstand the failure of one disk. RAID 10 is a combination of RAID 1 and RAID 0, which creates a striped array of mirrored pairs. RAID 10 provides high performance and reliability, but it also wastes half of the storage capacity for redundancy. RAID 10 can withstand the failure of one disk in each mirrored pair, but not more than that.
For more information on RAID levels, you can refer to the following sources:
✑ CompTIA Cloud+ CV0-003 Certification Study Guide, Chapter 4, Storage Technologies, page 791
✑ Cloud+ (Plus) Certification | CompTIA IT Certifications2
- (Topic 1)
A cloud administrator checked out the deployment scripts used to deploy the sandbox environment to a public cloud provider. The administrator modified the script to add an application load balancer in front of the web- based front-end application. The administrator next used the script to recreate a new sandbox environment successfully, and the application was then using the new load balancer.
The following week, a new update was required to add more front-end servers to the sandbox environment. A second administrator made the necessary changes and checked out the deployment scripts. The second administrator then ran the script, but the application load balancer was missing from the new deployment.
Which of the following is the MOST likely reason for this issue?
Correct Answer:
B
Checking in and committing are actions that save and update the changes made to a file or code in a version control system or repository. Checking in and committing can help track and synchronize the changes made by different users or developers working on the same file or code. The deployment script changes made by the first administrator were not checked in and committed is the most likely reason for the issue of the application load balancer being missing from the new deployment after a second administrator made some changes and ran the script. If the first administrator did not check in and commit the changes made to add an application load balancer to the script, then those changes would not be reflected or available in the latest version of the script used by the second administrator. References: CompTIA Cloud+ Certification Exam Objectives, page 13, section 2.5
- (Topic 4)
A cloud administrator used a deployment script to recreate a number of servers hosted in a public-cloud provider_ However, after the script completes, the administrator receives the following error when attempting to connect to one of the servers Via SSH from the administrators workstation: CHANGED. Which of the following IS the MOST likely cause of the issue?
Correct Answer:
C
This error indicates that the SSH client has detected a change in the server’s RSA key, which is used to authenticate the server and establish a secure connection. The SSH client stores the fingerprints of the servers it has previously connected to in a file called known_hosts, which is usually located in the ~/.ssh directory. When the SSH client tries to connect to a server, it compares the fingerprint of the server’s RSA key with the one stored in the known_hosts file. If they match, the connection proceeds. If they do not match, the SSH client warns the user of a possible man-in-the-middle attack or a host key change, and aborts the connection.
The most likely cause of this error is that the deployment script has recreated the server with a new RSA key, which does not match the one stored in the known_hosts file. This can happen when a server is reinstalled, cloned, or migrated. To resolve this error, the administrator needs to remove or update the old fingerprint from the known_hosts file, and accept the new fingerprint when connecting to the server again. Alternatively, the administrator can use a tool or service that can synchronize or manage the RSA keys
across multiple servers, such as AWS Key Management Service (AWS KMS) 1, Azure Key Vault 2, or HashiCorp Vault 3.