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NEW QUESTION # 15
Which of the following is a characteristic of all non-relational databases?
Answer: D
Explanation:
The characteristic of all non-relational databases is unstructured data. Unstructured data is data that does not have a predefined or fixed format, schema, or structure. Unstructured data can include various types of data, such as text, images, audio, video, etc. Non-relational databases, also known as NoSQL databases, are databases that store and manage unstructured data using different models, such as key-value, document, graph, columnar, etc. Non-relational databases are suitable for handling large volumes, variety, and velocity of data that do not fit well in the relational model. The other options are either characteristics of relational databases or not related to database types at all. For example, columns with the same data type, logical record groupings, and tabular schema are characteristics of relational databases, which are databases that store and manage structured data using tables, rows, columns, and constraints.
NEW QUESTION # 16
Which of the following is part of logical database infrastructure security?
Answer: D
Explanation:
The option that is part of logical database infrastructure security is perimeter network. Perimeter network, also known as DMZ (Demilitarized Zone), is a network segment that lies between an internal network and an external network, such as the internet. Perimeter network provides an additional layer of security for the internal network by isolating and protecting the servers or services that are exposed to the external network, such as web servers, email servers, database servers, etc. Perimeter network also helps prevent unauthorized access or attacks from the external network to the internal network by using firewalls, routers, proxies, etc. The other options are either part of physical database infrastructure security or not related to database infrastructure security at all. For example, surveillance is a method of monitoring and recording physical activities or events in a location or resource; biometric access is a device that uses biological characteristics to control access to a physical location or resource; cooling system is a device or system that regulates the temperature and humidity of a location or resource.
NEW QUESTION # 17
A company wants to deploy a new application that will distribute the workload to five different database instances. The database administrator needs to ensure that, for each copy of the database, users are able to read and write data that will be synchronized across all of the instances.
Which of the following should the administrator use to achieve this objective?
Answer: A
Explanation:
The administrator should use peer-to-peer replication to achieve this objective. Peer-to-peer replication is a type of replication that allows data to be distributed across multiple database instances that are equal partners, or peers. Each peer can read and write data that will be synchronized across all peers. This provides high availability, scalability, and load balancing for the application. The other options are either not suitable for this scenario or do not support bidirectional data synchronization. For example, failover clustering provides high availability but does not distribute the workload across multiple instances; log shipping provides disaster recovery but does not allow writing data to secondary instances; availability groups provide high availability and read-only access to secondary replicas but do not support peer-to-peer replication. Reference: CompTIA DataSys+ Course Outline, Domain 5.0 Business Continuity, Objective 5.3 Given a scenario, implement replication of database management systems.
NEW QUESTION # 18
Which of the following firewall types allows an administrator to control traffic and make decisions based on factors such as connection information and data flow communications?
Answer: C
Explanation:
The firewall type that allows an administrator to control traffic and make decisions based on factors such as connection information and data flow communications is stateful. A stateful firewall is a type of firewall that tracks the state of each connection and packet that passes through it, and applies rules or policies based on the context and content of the traffic. A stateful firewall can control traffic and make decisions based on factors such as source and destination IP addresses, ports, protocols, session status, application layer data, etc. The other options are either different types of firewalls or not related to firewalls at all. For example, a circuit-level firewall is a type of firewall that monitors and validates the establishment of TCP or UDP connections; a proxy firewall is a type of firewall that acts as an intermediary between the source and destination of the traffic; a packet firewall is a type of firewall that filters packets based on their header information.
NEW QUESTION # 19
(An analyst in the United States configured a database server so it could be accessed remotely by users in Brazil and Canada. Users in Brazil can connect to the server, but users in Canada cannot connect to the server.
Which of the following is the reason for the issue?)
Answer: C
Explanation:
The correct answer is B. The rule set was configured to allow specific IP addresses. CompTIA DataSys+ materials emphasize the importance of network security controls, particularly firewall rules and access control lists (ACLs), in regulating remote database access. In this scenario, the database server is reachable by users in Brazil but not by users in Canada, which strongly indicates that access is being selectively permitted rather than globally blocked.
Firewall rule sets are often configured using IP-based allowlists, where only approved IP addresses or IP ranges are permitted to establish a connection. If the analyst allowed the IP address range associated with Brazil but did not include the IP range used by Canadian users, connections from Canada would fail while Brazilian users would still have access. This behavior aligns precisely with selective rule-based access control, a common best practice highlighted in DataSys+ for reducing attack surfaces.
Option A is incorrect because if the perimeter network were rejecting remote connections entirely, users in Brazil would also be unable to connect. Option C is incorrect for the same reason: a firewall rule denying all connections would block access from all locations, not just Canada. Option D, server port security being disabled, would typically prevent all inbound connections to the database service, again affecting all users regardless of geography.
CompTIA DataSys+ stresses that troubleshooting connectivity issues requires identifying whether failures are global or location-specific. Location-specific failures are most commonly caused by misconfigured firewall rules, IP filtering, or regional access restrictions. In database environments that support remote access, DBAs must ensure that firewall rules are consistently applied to all authorized networks.
Therefore, the most accurate and verified explanation is that the rule set was configured to allow specific IP addresses, and the Canadian users' IP range was not included. This makes option B the correct answer.
NEW QUESTION # 20
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