Which minor component holds non-volatile memory?
Answer(s): B
ROM (Read-Only Memory) is a type of non-volatile memory that permanently stores firmware and critical system instructions, such as BIOS. Unlike RAM, ROM retains data even when power is turned off.Hennessy, J. L., & Patterson, D. A. (2017). Computer Architecture: A Quantitative Approach. Morgan Kaufmann.
Which type of network topology entirely shuts down if there is a break in the main cable?
Answer(s): C
In a bus topology, all devices share a single central cable (backbone). If this cable fails, the entire network becomes inoperable. This topology is simple and cost-effective but lacks redundancy.Tanenbaum, A. S. (2011). Computer Networks. Pearson Education.
Which protocol provides for the collection, organization, and modification of information about managed devices on IP networks?
SNMP (Simple Network Management Protocol) is used for monitoring and managing network devices such as routers, switches, and servers. It allows administrators to gather network performance data and configure devices remotely.Stallings, W. (2013). Foundations of Modern Networking. Pearson.
Which open-source operating system provides a rich environment for high-end workstations and network servers?
Answer(s): D
Linux is an open-source, Unix-like operating system widely used for servers, cloud computing, and high-performance workstations. It offers flexibility, security, and customization, making it the preferred choice for enterprise and web hosting environments.Nemeth, E., Snyder, G., Hein, T. R., & Whaley, B. (2017). Unix and Linux System Administration Handbook. Pearson.
What is the function of a primary key in a database table?
A primary key in a relational database table is used to uniquely identify each record in that table. It enforces entity integrity by ensuring that each row can be distinguished from every other row. A primary key must contain unique values and it cannot contain NULL values. This guarantees that every record is distinct and can be retrieved, updated, or related to other records efficiently.The primary key serves as the central reference point when creating relationships between tables through the use of foreign keys, thus enabling referential integrity within the database. Without a primary key, it would not be possible to maintain consistent and reliable relationships across different tables.Option A is incorrect because connecting tables to external systems is not the role of a primary key; this function is handled through integration tools or middleware.Option B is incorrect because managing user access is controlled by database access control mechanisms, not primary keys.Option D is incorrect because improving storage efficiency is related to data normalization, indexing, and storage optimization, not primary key assignment.Therefore, the correct function of a primary key is to identify each record in a table uniquely, ensuring data integrity and reliable referencing across the database.
Information Technology Management Study Guide Database Systems, Relational Models, and Data Integrity Principles (WGU ITM Core Curriculum).
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