The 802.11e standard is a proposed enhancement to the 802.11a and 802.11b wireless LAN (WLAN) specifications. It offers quality of service (QoS) features, including the prioritization of data, voice, and video transmissions. 802.11e enhances the 802.11 Media Access Control layer (MAC layer) with a coordinated time division multiple access (TDMA) construct, and adds error-correcting mechanisms for delay-sensitive applications such as voice and video. Answer option D is incorrect. 802.11h refers to the amendment added to the IEEE 802.11 standard for Spectrum and Transmit Power Management Extensions. Answer option B is incorrect. 802.11n is an amendment to the IEEE 802.11-2007 wireless networking standard to improve network throughput over the two previous standards - 802.11a and 802.11g - with a significant increase in the maximum raw data rate from 54 Mbit/s to 600 Mbit/s with the use of four spatial streams at a channel width of 40 MHz. Answer option A is incorrect. IEEE 802.15 is a working group of the IEEE 802 and specializes in Wireless PAN (Personal Area Network) standards. It includes seven task groups, which are as follows: 1.Task group 1 (WPAN/Bluetooth) 2.Task group 2 (Coexistence) 3.Task group 3 (High Rate WPAN) 4.Task group 4 (Low Rate WPAN) 5.Task group 5 (Mesh Networking) 6.Task Group 6 (BAN) 7.Task group 7 (VLC)

NetBIOS Extended User Interface (NetBEUI) is a Microsoft proprietary protocol. NetBEUI is usually used in single LANs comprising one to two hundred clients. It is a non-routable protocol. NetBEUI was developed by IBM for its LAN Manager product and has been adopted by Microsoft for its Windows NT, LAN Manager, and Windows for Workgroups products. It permits users to enter a user-friendly computer name into the Windows browser and to map network drives and view shared folders.
Answer option C is incorrect. Voice over Internet Protocol (VoIP) is a general term for a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet- switched networks. Other terms frequently encountered and synonymous with VoIP are IP telephony, Internet telephony, Voice over Broadband (VoBB), broadband telephony, and broadband phone.
VoIP systems employ session control protocols to control the set-up and tear-down of calls as well as audio codecs that encode speech, allowing transmission over an IP network as digital audio via an audio stream.
Answer option A is incorrect. RADIUS is a client/server protocol that runs in the application layer, using UDP as transport. The Remote Access Server, the Virtual Private Network server, the Network switch with port-based authentication, and the Network Access Server are all gateways that control access to the network, and all have a RADIUS client component that communicates with the RADIUS server. The RADIUS server is usually a background process running on a UNIX or Windows NT machine.
RADIUS serves three functions:
To authenticate users or devices before granting them access to a network; To authorize those users or devices for certain network services; To account for usage of those services.
Answer option D is incorrect. Address Resolution Protocol (ARP) is a computer networking protocol used to determine a network host's Link Layer or hardware address when only its Internet Layer (IP) or Network Layer address is known. This function is critical in local area networking as well as for routing internetworking traffic across gateways (routers) based on IP addresses when the next-hop router must be determined.

Explanation
Explanation:
Delphi technique, expert judgment, and function point analysis are used as a cost estimating technique during
the project planning stage. Delphi is a technique to identify potential risk. In this technique, the responses are
gathered via a questionnaire from different experts and their inputs are organized according to their contents.
The collected responses are sent back to these experts for further input, addition, and comments. The final list
of risks in the project is prepared after that. The participants in this technique are anonymous and therefore it
helps prevent a person from unduly influencing the others in the group. The Delphi technique helps in reaching
the consensus quickly. Expert judgment is a technique based on a set of criteria that has been acquired in a
specific knowledge area or product area. It is obtained when the project manager or project team requires
specialized knowledge that they do not possess. Expert judgment involves people most familiar with the work
of creating estimates. Preferably, the project team member who will be doing the task should complete the
estimates. Expert judgment is applied when performing administrative closure activities, and experts should
ensure the project or phase closure is performed to the appropriate standards.
A function point is a unit of measurement to express the amount of business functionality an information
system provides to a user. Function points are the units of measure used by the IFPUG Functional Size
Measurement Method. The IFPUG FSM Method is an ISO recognized software metric to size an information
system based on the functionality that is perceived by the user of the information system, independent of the
technology used to implement the information system.
Answer option B is incorrect. A PERT chart is a project management tool used to schedule, organize, and
coordinate tasks within a project. PERT stands for Program Evaluation Review Technique, a methodology
developed by the U.S. Navy in the 1950s to manage the Polaris
submarine missile program. A PERT chart presents a graphic illustration of a project as a network diagram
consisting of numbered nodes (either circles or rectangles) representing events, or milestones in the project
linked by labeled vectors (directional lines) representing tasks in the project. The direction of the arrows on the
lines indicates the sequence of tasks.