Week 10 (2).pptx
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IEEE 802.11 networks can be configured in two main topologies: 1) An Independent Basic Service Set (IBSS) is an ad-hoc network with at least two wireless stations but no infrastructure. 2) An Extended Service Set (ESS) is a larger infrastructure network with multiple Basic Service Sets interconnected by access points and a distribution system. IEEE 802.11 networks can operate in either infrastructure mode, with an access point, or ad-hoc mode without an access point where clients communicate directly.
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Here are the solutions to the examples:
Example 21.5:
Let f(x) = x^3 - 3x^2 + 2x. Then,
f'(x) = 3x^2 - 6x + 2.
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f'(x) = 5.
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Let f(x) = x^3 - 3x^2 + 2x. Then,
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Let f(x) = 5x - 3. Then,
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Let f(x) = 5x - 3. Then,
f'(x) = 5.
Example 21.7:
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Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
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Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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HYPERTENSION - SLIDE SHARE PRESENTATION.
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9
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- 1. IEEE 802.11 Topology • Independent Basic Service Set (IBSS) Networks – Stand-alone BSS that has no backbone infrastructure and consists of at-least two wireless stations – Often referred to as an ad-hoc network – Applications include single room, sale floor, hospital wing
- 2. IEEE 802.11 Topology (contd.) • Extended Service Set (ESS) Networks – Large coverage networks of arbitrary size and complexity – Consists of multiple cells interconnected by access points and a distribution system. • To integrate the IEEE 802.11 architecture with a traditional wired LAN, a portal is used
- 3. • Station (STA): Terminal with access mechanisms to wireless medium and radio contact to access point. • Basic Service Set (BSS): Groups of station using the same radio frequency. • Access Point (AP): station integrated into the wireless LAN and distribution system • Portal: Bridge to other networks (wired) • Distribution System: Interconnection network to form one logical network (ESS) based of BSS
- 4. IEEE 802.11 Operating Modes • 802.11 Infrastructure Mode – at least one wireless AP and one wireless client. • 802.11 Ad Hoc Mode – Wireless clients communicate directly with each other without the use of a wireless AP.
- 5. Outline • IEEE 802 Architecture • 802.11 Architecture and Services • 802.11 MAC • 802.11 Physical Layer • Other 802.11 Standards
- 6. 3.3 .1 IEEE 802 Architecture
- 7. IEEE 802 Protocol Layers
- 8. Protocol Architecture • Functions of physical layer: – Encoding/decoding of signals – Bit transmission/reception – Includes specification of the transmission medium
- 9. Protocol Architecture • Functions of medium access control (MAC) layer: – On transmission, assemble data into a frame with address and error detection fields – On reception, disassemble frame and perform address recognition and error detection – Govern access to the LAN transmission medium • Functions of logical link control (LLC) Layer: – Provide an interface to higher layers and perform flow and error control
- 11. MAC Frame Format • MAC control – Contains Mac protocol information • Destination MAC address – Destination physical attachment point • Source MAC address – Source physical attachment point • CRC – Cyclic redundancy check
- 13. LLC Services • Unacknowledged connectionless service – No flow- and error-control mechanisms – Data delivery not guaranteed • Connection-mode service – Logical connection set up between two users – Flow- and error-control provided