What is Network Security- CompTIA Network+

What is Network Security- CompTIA Network+

Introduction In this lesson you will learn about how to secure networks from unauthorized individuals. Several different methods for achieving security will be discussed. A network administrator should be concerned whether or not the “right” people have access to the network. Lesson Objectives By the end of this lesson, you …

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Host to Host Communication- CompTIA Network+

Host to Host Communication- CompTIA Network+

Introduction This article will introduce how computers and other hosts communicate internally and externally. A discussion of how data travels from the host, to the media will introduce dependent topics which should give an in-depth view of host communication. Lesson Objectives By the end of this lesson, you will be …

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Network Cable Types and Connectors

Network Cable Types and Connectors

Introduction This lesson will examine the different media types, standards, and wire distributions involved in a networked environment. Lesson Objectives By the end of this lesson, you will be able to: Categorize standard media types and connectors. Identify components of wiring distribution. Compare and contrast different Local Area Network (LAN) …

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Network Security Firewall- CompTIA Network+

Network Security Firewall- CompTIA Network+

Firewalls are responsible for either “blocking” or “allowing” data traffic to an internal network. By default, firewalls use what is called “implicit deny;” until a network administrator explicitly allows a certain type of traffic, it is blocked. The data traffic that a network administrator blocks or allows is part of …

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What is Network Management?

What is Network Management?

Introduction In this lesson you will be introduced to tools and software used to manage a network. Often a need will arise to identify when a cable goes bad or a router/switch is not functioning as it should. A network administrator will use these tools and software to determine where …

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Types of Network Topologies with Diagram

Types of Network Topologies with Diagram

Introduction During this lesson you will be introduced to the components that make up a network as well as knowing the components of a network, several different models and topologies will also be discussed. Lesson Objectives By the end of this lesson, you will be able to: Describe TCP/IP model …

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Fiber and Wireless Network Media

Fiber and Wireless Network Media

When data packets leave the NIC, the medium that takes the packet from source to destination is called media. Media comes in various forms including copper wire, fiber optics, and wireless. Once the media access method, CSMA/CD or CSMA/CA, has been implemented, the data packets are on the media and …

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What is a Network Appliance?

What is a Network Appliance?

Servers will process many request from clients, but servers have a limit to how many connections can be serviced at one time, an example would be a web server. A load balancer will distribute network data across multiple interfaces or hosts. It is an intelligent appliance that can determine if …

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Network Documentation Examples

Network Documentation Examples

Documentation is an important aspect of Network Management and should be done from the planning, through the implementation and modification phases. A network administrator will store this documentation so it can be recalled and updated when necessary. Provided below are some examples of how and why data is documented. 1.Vendor …

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Introduction to Networks- CompTIA Network+

Introduction to Networks- CompTIA Network+

Lesson Objectives By the end of this lesson, you will be able to: 1. Describe the steps involved in developing an effective troubleshooting methodology. 2. Identify CompTIA and the Learning Domains for the Network + exam. 3. Describe what computer networking is and how it was initiated. 4. Compare the …

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DNS and DHCP Explained

DNS and DHCP Explained

Introduction This lesson will describe Domain Name Service (DNS), Dynamic Host Configuration Protocol (DHCP) as well as other protocols and port relationships. Lesson Objectives By The End Of This Lesson, You Will Be Able To: Explain the purpose of DNS. Explain the purpose of DHCP. Identify common ports and networking …

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Signal Processing Applications

Signal Processing Applications

Among the numerous applications of diodes, there are a number of interesting signal conditioning or signal processing applications that are made possible by the non-linear nature of the device. We explore three such applications here: the diode limiter, or clipper; the diode clamp; and the peak detector. Other applications are left for the homework problems. Diode Clipper (Limiter) …

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Inductor and Capacitor Basics

Inductor and Capacitor Basics

The ideal resistor was a useful approximation of many practical electrical devices. However, in addition to resistance, which always dissipates energy, an electric circuit may also exhibit capacitance and inductance, which act to store and release energy, in the same way that an expansion tank and flywheel, respectively, act in …

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Phase Sequence in Three-Phase System

Phase Sequence in Three-Phase System

In a three-phase service supplied by an electrical utility company, all three line voltages have the same magnitude and are displaced from one another by 120°. We can measure the magnitude of these voltages quite readily. However, the magnitudes do not tell us whether VBN leads VAN by 120° or …

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Advantages of Polyphase System

Advantages of Polyphase System

The two-phase alternator in Figure 1(a) has two identical loops mounted on the same rotor. Since both loops have the same number of turns and rotate at the same angular velocity, the voltages induced in them have the same magnitude and frequency. Loop A is mounted on the rotor 90° …

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