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NEW QUESTION # 117
What is a priority of business continuity?
Answer: C
Explanation:
A priority of business continuity is maintaining critical system replicas so essential services can continue or be restored quickly after a disruption. In Information Technology and business continuity planning, organizations identify mission-critical systems and ensure there are standby resources such as replicated servers, replicated databases, or mirrored environments that can take over if the primary systems fail. Replicas support rapid recovery and reduced downtime by enabling failover and restoration without rebuilding from scratch. While on-site redundancy can help with minor failures, business continuity typically emphasizes resilience beyond a single location, since a site-wide incident can disable all on-site resources. Extensive black-box testing relates more to software testing methods than continuity priorities, and rapid system development is a software engineering concern, not the central focus of continuity. Critical system replicas may exist as hot, warm, or cold arrangements depending on recovery time objectives, but the underlying priority is ensuring a working copy of vital systems exists for continuity. Therefore, the correct answer is critical system replicas.
NEW QUESTION # 118
Which task is accomplished by an IT professional organization?
Answer: B
Explanation:
Publishing professional journals is a common task accomplished by IT professional organizations. In Information Technology, organizations such as ACM and IEEE publish peer-reviewed journals, magazines, conference proceedings, and technical standards that help share research, best practices, and emerging developments. These publications support professional learning, improve the quality of practice, and help define the body of knowledge for the field. Coordinating data exchange policies between states is more likely a government or intergovernmental function. Producing government regulations is the role of regulatory agencies, not professional associations. Brokering international trade agreements is handled by governments and international trade bodies rather than IT professional organizations. Professional organizations typically provide conferences, certifications or professional development programs, codes of ethics, special interest groups, and publications. Since journals and technical publications are a standard output of professional associations, the correct answer is publishing professional journals.
NEW QUESTION # 119
Which type of communications media uses light waves to transmit data?
Answer: D
Explanation:
Fiber optic communication uses light waves to transmit data. Here's how it works:
1.Fiber Optic Cable Structure:
oA fiber optic cable consists of a core made of glass or plastic, surrounded by a cladding layer.
oThe core acts as a light guide, allowing light to travel through it by total internal reflection.
oThe cladding layer ensures that the light remains within the core.
2.Light Propagation:
oWhen data needs to be transmitted, a light source (usually a laser or LED) sends pulses of light into the fiber.
oThe light travels down the core, bouncing off the cladding due to total internal reflection.
oAs a result, the light signal remains confined within the core.
3.Advantages of Fiber Optics:
oHigh Bandwidth: Fiber optics can transmit large amounts of data quickly.
oLow Attenuation: Light signals experience minimal loss over long distances.
oImmune to Electromagnetic Interference: Unlike copper cables, fiber optics are not affected by electromagnetic fields.
oSecure: It's difficult to tap into fiber optic cables without detection.
4.Applications:
oInternet Backbone: Fiber optics form the backbone of the global internet, connecting continents.
oTelecommunications: Used for long-distance phone calls and high-speed internet.
oData Centers: Within data centers, fiber optics connect servers and storage devices.
oCable TV: Many cable TV networks use fiber optics for signal distribution.
References:
1.Li-Fi - Wikipedia
2.Types of Transmission Media - GeeksforGeeks
3.Welcome, Li-Fi: Technology uses light to transmit data
NEW QUESTION # 120
Which piece of network equipment extends the cable range and allows connections to be made by increasing the signal strength?
Answer: A
Explanation:
A repeater extends cable range by regenerating or amplifying a signal so it can travel farther without degrading. In Information Technology networking, signals weaken over distance due to attenuation and interference. A repeater receives the incoming signal, cleans or reconstructs it, and then retransmits it at full strength. This allows network segments to exceed the normal maximum cable length limits for a given standard and helps maintain reliable communication. Repeaters are commonly associated with the physical layer of networking because they deal with signal transmission rather than packet routing or traffic decisions.
A switch operates mainly at the data link layer and forwards frames based on MAC addresses within a local network, but it does not primarily exist to boost signal strength. A router connects different networks and forwards packets using IP addressing and routing tables. A firewall is a security device that filters traffic based on rules to protect networks. Since the question focuses on increasing signal strength to extend range, the correct equipment is a repeater.
NEW QUESTION # 121
Based on an analysis of a company's needs, a database should be installed so that data resides on different machines, often in entirely different locations. What is the name of the database that satisfies this need?
Answer: A
Explanation:
A distributed database is a database in which data is stored across multiple computers or servers rather than in a single central location. These machines may be in the same building, across a campus, or in different geographic regions. In Information Technology and database design, distributed databases are used to improve availability, fault tolerance, scalability, and performance by placing data closer to users and by reducing reliance on one server. The distributed database management system coordinates storage, replication, and query processing so that users can access data as if it were a single database, even though it is physically spread out. This model supports business continuity because if one site fails, another site can continue serving requests depending on the replication strategy. Relational and NoSQL describe data models and query approaches, while cloud describes a deployment environment that can host many types of databases, including distributed ones. Because the defining requirement here is data stored on different machines and locations, the correct answer is a distributed database.
NEW QUESTION # 122
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