review of data link layer 2 a) Explain the working principles of the data link layer. 2 b) Is controlled access better than contention for media access control? Discuss. 2 c) Why is error detection important in this layer? What is being measured? 3 d) Identify three significant noises that can cause errors in data communication digital circuits. Briefly explain. 3 Part 2: General review of error correction 4 a) Why is cyclical redundancy check (CRC) most popular error checking
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Mathematics‚ and Geography are three of the most important Muslim innovations of all time. Others argue that architecture is the most important Islamic innovation‚ or at least one of the top three. But while architecture is important to culture and history‚ according to the My World History textbook “ Muslim architects built breathtaking mosques‚ fountains‚ gates‚ gardens‚ baths‚ and palaces.” it isn’t as important as math. Mathematics is one of the most important Muslim Innovations that is used in modern
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SCIENCE 6 (Semi-detailed) I. OBJECTIVES a. Identify the layers of the Earth; b. Describe each layer and its composition; and c. Label the layers of the Earth’s surface. II. LEARNING TASKS a. Topic: The Earth’s Surface b. Concepts: a. The major sections of the earth based on chemical composition are the crust‚ mantle and the core. b. The crust is the outer layer; the mantle is the middle layer and the core the inner layer. c. Values: Gratefulness d. Skills: Comparing and differentiating
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BOUNDARY LAYER THEORY INTRODUCTION The concept of boundary layer was 1st introduced by L.Prandtl in 1904. Figure 7-1. Viscous flow around airfoil A structure having a shape that provides lift‚ propulsion‚ stability‚ or directional control in a flying object. Boundary layer is formed whenever there is a relative motion between the boundary and the fluid. Boundary layer thickness: 1. Standard thickness - signified by ‚” it is define as the distance from the boundary layer
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Introduction to Network Devices All networks are made up of basic hardware building blocks to interconnect network nodes‚ such as Network Interface Cards (NICs)‚ Bridges‚ Hubs‚ Switches‚ and Routers. In addition‚ some method of connecting these building blocks is required‚ usually in the form of galvanic cable (most commonly Category 5 cable). Less common are microwave links (as in IEEE 802.12) or optical cable ("optical fiber"). An ethernet card may also be required. Network interface cards
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few centimeters per year. 3. Core: The Earth has an iron-nickel core that is about 2‚100 miles in radius. At the core-mantle boundary‚ composition changes. Seismic waves suggest this material is of a very high density (10-13 g/cm3)‚ which can only correspond to a configuration of metals rather than rock. The presence of a magnetic field around the earth also indicates a molten metallic core. Unlike the crust and the mantle‚ we don’t have any samples of the core to look at‚ and therefore there
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Global Criteria Within the 12 core functions of substance abuse counseling‚ there are what is called global criteria for each function‚ which are the necessary skills a counselor needs to carry out each core function properly (Herdman‚ 2008). This essay focuses on four of the 12 core functions‚ including case management‚ crisis intervention‚ counseling‚ and treatment planning. Case management is the activities which bring services‚ agencies‚ resources‚ or people together within a planned framework
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The OSI model has seven layers‚ with each having different types of security responsibilities. The seven layers are application‚ presentation‚ session‚ transport‚ network‚ datalink and physical with control being passed down from layer to layer starting with application. The biggest threat to these layers is through people‚ sometimes known as the 8th layer of the OSI model. Companies should take the time to educate their employees on the security threats that each individual brings to the company
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Richman Investments Policy: Network Access and Authentication Policy Created: 1/12/2014 Section of: Corporate Security Policies Target Audience: Technical CONFIDENTIAL Page: 1 of 5 Richman Investments is hereinafter referred to as “the company.” 1.0 Overview Consistent standards for network access and authentication are critical to the company’s information security and are often required by regulations or third-party agreements. Any user accessing the company’s computer systems has the ability to
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The Most Important Problems in Today’s World There are many problems facing the world in today such as a nuclear weapon‚ a conflict of Middle East area‚ starvation in Africa and so on. Of course‚ above problems are also serious but I think that the most serious problem facing the world is an environmental problem and to be specific‚ I’d say a global warming. Albert Gore states “Global warming will be the greatest environmental challenge in the 21st century.” So what is The global warming
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