Which of the following IEEE standards defines the local multipoint distribution service?
Answer(s): A
The IEEE 802.16.1 standard defines the local multipoint distribution service. Answer option C is incorrect. The IEEE 802.15.1 standard defines Bluetooth certification. Answer option B is incorrect. The IEEE 802.18 standard defines Radio Regulatory TAG. Answer option D is incorrect. The IEEE 802.19 standard defines the Coexistence TAG.
The goal of computer security is to protect information and property from theft, corruption, or natural disasters while allowing the information and property to remain accessible to authorized users.Which of the below mentioned actions would you perform to secure your system? Each correct answer represents a complete solution. Choose all that apply.
Answer(s): A,C,D
Security is a process, not a product. The goal of computer security is to protect information and property from theft, corruption, or natural disaster, while allowing the information and property to remain accessible to authorized users. The requirement of security is very high in all sectors, as practically everyone uses the Internet and wants to protect their resources and information against malicious attackers.Some basic security tips are as follows:Always take backups.Update and patch the operating system, Web browser, and other software.Install a firewall.Review the Web browser and e-mail settings for optimal security. Install antivirus software and set for automatic updates. Do not open and run unknown e-mail attachments and programs.
Which of the following terms are allowed by Boolean search strings to refine a search? Each correct answer represents a complete solution. Choose all that apply.
Answer(s): B,C,D
Boolean search strings allow the use of terms such as AND, OR, and NOT to refine the search and produce results. Google acquires AND with every search on multiple keywords. By default, most search engines and directories use some Boolean terms.
Which of the following OSI layers is responsible for protocol conversion, data encryption/decryption, and data compression?
The Presentation layer is a part of an operating system that converts incoming and outgoing data from one presentation format to another. It is responsible for protocol conversion, data encryption/decryption, expanding the graphics command, and data compression. It defines the format of data being sent and any encryption that may be used, and makes it presentable to the Application layer. It presents the data in a uniform format and masks the difference of data format between two dissimilar systems. It also translates the data from an application to the network format. The Presentation layer is the best layer for cryptography. It is sometimes also called the Syntax layer. Answer option C is incorrect. The data-link layer sends data frames from the network layer to the physical layer. On the receiving end, it packages the raw bits from the physical layer into data frames. The data-link layer is responsible for error free transfer of data frames. Answer option B is incorrect. The network layer controls the operation of subnet, deciding which physical path the data should take, based on network conditions, priority of service, and other factors. Routers work on the Network layer of the OSI stack. Answer option D is incorrect. The Transport Layer of TCP/IP model is responsible for end-to-end message transfer capabilities independent of the underlying network, along with error control, segmentation, flow control, congestion control, and application addressing (port numbers). End to end message transmission or connecting applications at the transport layer can be categorized as either connection-oriented, implemented in Transmission Control Protocol (TCP), or connectionless, implemented in User Datagram Protocol (UDP).
Samantha works as a Web Developer for BlueWell Inc. She develops a Web application using Visual InterDev. She wants to group a series of HTML elements together so that an action can be performed collectively on them.Which of the following tags will Samantha use to accomplish this?
Answer(s): D
DIV is an HTML tag that groups a series of elements into a larger group. It can be used when an action needs to be performed collectively on the grouped elements. The DIV tag acts as a container for other elements. Answer option B is incorrect. The SPAN tag is used within an element to group a part of it. For example, this tag can be used to group a few sentences from within a paragraph, so that a particular action can be performed only on them. Answer option C is incorrect. The BODY tag is used to specify the beginning and end of the document body.Answer option A is incorrect. There is no tag such as GROUP in HTML.
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