CompTIA FC0-U61 Exam

NFC (Near Field Communication) is a wireless technology that allows devices to communicate and exchange data within a short range, typically a few centimeters. NFC is commonly used for tap to pay transactions, where a customer can use a contactless card or a smart device (such as a smartphone or a smartwatch) to make payments by tapping or hovering over a compatible terminal. NFC is different from other wireless technologies, such as Wi-Fi, IR (Infrared), and Bluetooth, because it does not require pairing, authentication, or network access to work. NFC is also faster, more secure, and more convenient than other payment methods, such as inserting or swiping a card.Reference:CompTIA IT Fundamentals (ITF+) Certification Guide, page 25;What is Tap to Pay and How Does It Work?

The 5GHz frequency band is less prone to interference from other household appliances, such as microwaves, cordless phones, and Bluetooth devices, than the 2.4GHz band. The 5GHz band also offers more non-overlapping channels and higher data rates than the 2.4GHz band. However, the 5GHz band has a shorter range and lower penetration than the 2.4GHz band, so the technician should consider the size and layout of the SOHO network before choosing the frequency band. 802.11b and 802.11g are wireless standards that operate in the 2.4GHz band, while 802.11a, 802.11n, and 802.11ac can operate in both the 2.4GHz and 5GHz bands.Reference:

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NFC (Near Field Communication) is a wireless technology that allows devices to communicate and exchange data within a short range, typically a few centimeters. NFC is commonly used for tap to pay transactions, where a customer can use a contactless card or a smart device (such as a smartphone or a smartwatch) to make payments by tapping or hovering over a compatible terminal. NFC is different from other wireless technologies, such as Wi-Fi, IR (Infrared), and Bluetooth, because it does not require pairing, authentication, or network access to work. NFC is also faster, more secure, and more convenient than other payment methods, such as inserting or swiping a card.Reference:CompTIA IT Fundamentals (ITF+) Certification Guide, page 25;What is Tap to Pay and How Does It Work?

A query language is a type of programming language that is used to manipulate and retrieve data from databases. A query language allows users to specify what data they want to access, filter, sort, join, or perform calculations on, without having to know how the data is stored or organized. A query language usually consists of keywords, operators, expressions, and clauses that form statements or commands. One of the most common and widely used query languages is SQL (Structured Query Language), which is supported by many relational database management systems (RDBMS).

A query language would most likely include tables and the select command, as these are essential components of working with databases. A table is a collection of data that is organized into rows and columns, where each row represents a record and each column represents a field or an attribute. A table can have a name, a schema (the definition of the columns and their data types), and constraints (the rules that enforce the integrity and validity of the data). For example, in the following SQL code, a table named Customers is created with four columns: CustomerID, Name, Email, and Phone:

CompTIA IT Fundamentals+ (ITF+) Certification Exam Objectives, page 16, section 4.1

CompTIA IT Fundamentals+ (ITF+) Study Guide, page 209, section 8.2

CompTIA IT Fundamentals+ (ITF+) All-in-One Exam Guide, Second Edition, page 303, chapter 9

Table Design | CompTIA IT Fundamentals+ (FC0-U61) | Part 29 of 38

NFC (Near Field Communication) is a wireless technology that allows devices to communicate and exchange data within a short range, typically a few centimeters. NFC is commonly used for tap to pay transactions, where a customer can use a contactless card or a smart device (such as a smartphone or a smartwatch) to make payments by tapping or hovering over a compatible terminal. NFC is different from other wireless technologies, such as Wi-Fi, IR (Infrared), and Bluetooth, because it does not require pairing, authentication, or network access to work. NFC is also faster, more secure, and more convenient than other payment methods, such as inserting or swiping a card.Reference:CompTIA IT Fundamentals (ITF+) Certification Guide, page 25;What is Tap to Pay and How Does It Work?