Introduction To Networks
So. It's time, to start now and let's, go ahead with our first, section, introduction. To networks. In, this section we're going to talk about basics. Of network, lens. Lens. And the internet, and network, trends. And security. Overview. Alright, let's go we are starting. Our training, with an interesting. Graphic. This. Graphic. Shows us number. Of devices, connected, to internet, worldwide, as you, can see. There. Were eight billions. Of devices connected to internet, but, it is assumed, to be. 50. Billions, there. Is a really crazy, number. Guys and that, means, we. Will need much. More resources, such as bandwidth. And, stronger. Devices, and more. Secure, networks. Let's. Go ahead with the global, community networks. Nowadays. We. May often need to meet people from different parts. Of the world especially. Global. Companies, can, often, hold meetings with, employees in, different, locations, however. It can, be very difficult for all employees, to come together at the same location, for each, meeting. Both, in, terms of time, and cost. Cisco. Has two, great solutions. For eliminating, these time, and cost problems, the. First solution is video. Conference, video. Conferencing, is, a technology. That allows users, in, different locations. To hold face-to-face. Meetings, without having to move to a single. Location together. This. Technology. Is particularly. Convenient. For, business. Users, in different steez. Or even. Different countries, because it saves time, expense. And hassle. Associated. With mucinous, travel. The. Second, technology, we are gonna focus on is. Telepresence. When, you're conferencing, technology, isn't always, able to dissolve, barriers. And, facilitate. Remote collaboration. Cisco. TelePresence. Recreates. The meeting, room experience. So, you can meet face, to face with your, globally. Dispersed, teams, now. In-person. Meetings. Can, be happen, without the hassle of travel, so, you can be more available and, more effective. Than ever before. The, cisco telepresence. Experience. Delivers. High quality audio. And, high-definition, video, or, a reliable. IP network. Unlike. Video conferencing. Your, meetings, will look and sound. As if, all, the, participants. Are actually. Together in the same room here. Is the telepresence, device, as you can see in here, these, guys are maybe, in, poorest. And, these. Guys are for example in. Tokyo. But. What they feel, is as, you can see they're on the same, table that's a really great, and cool technology. Now. Let's, talk about the variety. Of networks. According. To their size. Small. Home office. Networks, are networks. Of several. Pieces. Laptops. And Printers. And it. Means basic. Requirements. Such, as surfing. On the internet. For example. Medium. Sized networks, usually, consists. About, 15. Or 20 pieces. Laptops. And just. A few printers, maybe in, these, networks also. A networked device, such. As switch, or rather, can. Be used, which. We will see in more detail, later. And. Let's. Go ahead with the large and world, world network, large. Networks. Are. Geographically. Distributed. Networks. In, such. Works we're powerful, network, devices are used to provide communication, between, the ends, a simple. Example of these, networks, is simply. Internet. Or we. Can think about a global company. Such, as Cisco, and Cisco. Uses the, large, networks, to provide communication, between, different, locations, such, as Cisco. Australia, Cisco. Poland and Cisco, China and epsilon, different. Buildings. Let's. Take a look to client, and server, concepts. Now. These. Guys, are, the, clients. And. This. Guy is the. Server. Clients. Are the devices, such, as PCs. Smartphones, and. Laptops that. Request. A service, from the servers. And servers. Are the devices, that provide, requested. Service, to, the clients, servers.
Are Classified. By the service. They, provide for. Example a web, server serves, a web page a file, server serves. Computer. Files and, something. Like that the. Client. Established. A connection to, the server over a local, area or wider. A network, such as the internet maybe. Once. The server, has fulfilled. The clients, request the, connection, is terminated. For. Example, let's. Say that this PC, wants. To connect, with the Google's, web page and let's. Say that. This, is the web. Server of the Google if you, want to connect, Google's. Web page. Your. PC. Is the client, which requests. The web page and, Google's. Web server. Provides. You, the. Requested. Service which is a web, page for, this situation. And. Let's go ahead with the lands, winds and the internet. Let's. First, talk about, devices, that we can use in a network, there. Are two types of devices, and, there. Anti-isis. And the, infrastructure. Devices, the. Network, devices, that. People are most. Familiar with, are, called. End devices. Or, hosts. These. Devices. Form, the interface. Between, users. And the, underlying. Communication network. Some, examples. Of end devices, are computers. Network. Printers VoIP. Phones. Telepresence. Endpoints. Security. Cameras, and something. Like that. Infrastructure. Devices, are the devices, that, helps. To provide, communication. Between different. Antivirus for. Example, you can communicate, different. Pieces by. Using, Suites. On the same, local, area network as an. Example, we, can give switch. Access. Points, reuters. And firewalls. To the infrastructure. Devices. And. Let's go ahead with the network. Media, network. Media, refers. To the communication. Channels, used, to interconnect, nodes. On a computer. Network, in. A network, became. Port communication. In two. Ways and they're. Wired. And, wireless. In. A word media. We. Use different. Types of cables, such as copper. Cable, our fiber. Optic, cable to, provide communication. Between different. Devices. Wireless. Network, media provides. Communication, between, two, or more networking. Devices, that. Are not, connected by. A cable the. Most common, wireless technologies. Use, radio. Waves with. Radio, waves distances. Can be shot, such, as a few, meters for Bluetooth, or as, far, as millions. Of kilometers, for deep, space radio. Communications. And. Network. Infrastructures. Can vary greatly in. Terms of. Size. Of, the area, covered. Numbers. Of the connected, users, numbers. And types of services available. Basically. We, have four, types of networks. And they. Are, local. Area network. Wide. Area network. Metropolitan. Area network and. Storage. Area, network. Local. Area, network, LM. Is, a. Network. Infrastructure. That, provides access, to, users. And end, devices. In a small. Geographical. Area, lens. Interconnect. Anti-isis. In a limited area such, as a home. School. Office. Building, or campus.
A LAN. Is usually. Administered, by. A single. Organization, or the. Individual. Let's. Go ahead with the wide area network, wide. Area network, van, is a network. Infrastructure. That. Provides access, to other, networks. Over a wide. Geographical. Area this is the difference from the local area network, winds. Are typically. Managed. By service, providers or. Internet. Service providers. And they. Interconnect. Different. Local area networks, over. Wide, geographical. Areas, such as between these. States. Province's. Countries. Or something, like that in, the figure you see, a van, infrastructure. And. Here. There's. A London, office, in. Here, there's. A Dallas, office in. Here, there's, a Washington, office and in. Here, there's, a Berlin. Local area network and wider. A network. Interconnect. Is different, local, area networks. Between different. Countries. Let's. Go ahead with metropolitan. Area network and man. Is, a network. Infrastructure. That spends, a physical. Area, larger. Than a local, area network but. Smaller. Than a wide area network, man's. Metropolitan. Area networks, are. Typically. Operated by, a single, entity such, as a large, organization. A. Storage. Area, network, is a network. Infrastructure. Designed, to support, file, servers, and poor, data, storage, retrieval, and. Replication. It involves. High-end, servers. Multiple. Disk arrays. And fibre. Channel. Interconnection. Technology. Although. There. Are benefits, using. Local. Area network or wider. Network, most. Individuals. Need to communicate with, a resource, on another, network outside, of the local network within, the home campus. Or, organization. This. Is done, using, the internet. The, Internet. Is a worldwide. Collection. Of. Interconnected. Networks. Cooperating. With each other, to, exchange information. Using. Common standards. Through. Telephone. Wires fiber. Optic, cables, wireless. Transmissions. And, satellite. Links, Internet, users, can exchange, information, in. A, variety of forms. But. How. We can connect to internet we. Have some options for this the. First option we are going to check as, DSL. Digital. Subscriber. Line technology. Digital. Subscriber. Line is, a family, of technologies, that are used to transmit, digital data. Over. Telephone, lines in. Telecommunications. Marketing, the. Turn DSL, is rightly understood. To mean a. DSL. The most commonly, installed DSL. Technology, for internet, access. DSL. Service, can be delivered. Simultaneously. With water, from, service, on the same telephone, line since. DSL. Uses, higher frequency. Bands for, data here. Is how we can connect, to internet, by, DSL, here, is your computer, device and. You. Connect, your, computer's. Network. Interface. Card. To. A device, named. Model. This. Modem. Device, is connected. To a. Little. Device, little. Equipment named. Splitter. Which. Splits, the, telephone. And the, data, frequencies. The, other side, of the. Splitter. Is connected. To your phone. And. Splitter. Is, connected. To a. Device. Named. The, Islam, on the isp, side and. This. Da islam is. Connected. To isp. Backbone, and this, backbone. Takes. You to the internet. Simply. You. Can also connect, to internet by, using cellular or mobile. Network, a cellular. Network or, mobile, network is a communication. Network where, the last, link is wireless, the. Network, is distributed. Over land, areas, called, cells. Each. Short, by at least, one, fixed, location, transceiver. But, normally. Three, cell sites, or base.
Transceiver. Station. The. Most popular. Cellular. Networking, communications. Are, 3G. 4G. And that's. Gonna be 5g. In the feature. Satellite. Internet, access, is the internet, access. Provided, through. Communication. Satellites. Modern. Consumer, grade satellite. Internet. Service, is typically. Provided, to, individual. Users through. Geostationary. Satellites. That, can offer, relatively. High data speeds up to. 50. Megabit, per second. And. Here's, how we can connect, to Internet. By using satellite. Here. Is our PC, and our, PC. Is connected to. Satellite. Rather this type. Satellite. Rather is connected, to antenna. And these, antennas. Are. Communicating. Each, other, by using a. Satellite. This. Satellite, forwards. Packets, through. Internet. Site and you can access. The Internet by using, this. Antenna, and knock, hop. Another. Interconnection. Option, is Metro. Ethernet. Metro. Ethernet network, is a metropolitan. Area network that is based on, Ethernet, standards. It's, commonly. Used to connect subscriber. To a larger, service, network, or the, Internet. Businesses. Can also use metropolitan. Area Ethernet, to connect their own offices. To each, other and, in. The third step we'll talk about network, trends, and, security. Overview. The. First one, we are going to talk about is, B. Why all the, bring-your-own-device. Bring-your-own-device. Refers. To the policy, of permitting, employees. To bring, personally. Owned devices such. As laptops. Tablets. And smartphones, to. Their workplace. And to. Use those, devices to. Access privileged. Company, information. And, applications. And. Let's go ahead with the another. Trend, which is online. Collaboration. Simply. Put online, collaboration. Lets a group, of people, work. Together in, real, time over the, internet. Those. Engaged. In online collaboration. Can, work, together on, word processor, documents. PowerPoint. Presentations. And even. For, brainstorming. All without, needing to, be in the same, room at the same, time. The. Another trend is cloud. Computing. Cloud. Computing, is a delivery, of computing. Services, such as servers. Storage. Databases. Networking. Software's, or something, like that over. The internet. Which is known as the cloud. Companies.
Offering. These computing, services. Are called. Cloud. Providers. And. Typically. Charge. For, cloud, computing, services, based on usage. Similar. To how, you are built for water, or, electricity, at. Home. Instead. Of having to invest heavily in data, centers, and servers. Before. You know how you, are going to use them you. Can only pay, when you consume, competing. Resources. And only. Pay for, how, much you consume, and. Let's. Go ahead with two data centers a data. Center, is a facility. Composed, of networked computers. And storage. That businesses. Business. Or other, organizations. Used to organize, process. Store. And. Disseminate. Large. Amounts, of data. Data. Centers, are not, a single, thing guys but, rather a. Conglomeration. Of, elements. It's a minimum, data, centers, serve as the principal. Repositories. For. All manner, of IT. Shipment including. Servers. Storage. Subsystems. Networking. To its Rather's. And, firewalls. As well. As the cabling, and physical. Racks used, to organize, and, interconnect. The IT, equipment, a data, center, must, also contain, an etiquette. Infrastructure. Such, as power distribution. And. Supplemental. Power subsystems. Including. Electrical. Switching, an. Interoperable. Power. Supplies, backup. Generators. And so, on, ventilation. And, data, center cooling systems, such as computer. Room air, conditioners. And adequate. Provisioning. For network. Carrier. Connectivity. And. Let's. Take a look to the smart, houses, a smart. Home, is a residence. That uses. Internet. Connected, devices, to, enable the remote, monitoring, and management. Of appliances. And systems. Such, as lighting. And heating. Smart. Phone technology, also. Known as the home, automation. Provides. Homeowners. Security. Comfort. Convenience. And, energy. Efficiency. By allowing, them to control smart. Devices often by, a smart. Home, application on. Their, smartphone, for. Example when, you are outside, on a hot, summer. Day you, can cool your home by, running the air conditioner. Remotely. By using your, smartphone. And. Another. Trend, is powerline. Networking. Powerline. Networking, as its, name implies, uses. Your existing. Electrical. Power cabling, to transmit, digital data, in. This case it is used to transfer, your networking, data, this. Can essentially. Be, thought, of acting, like a wired. Network where, your electrical. Wiring replaces. A large, say, of unsightly. Ethernet. Cable. Powerline. Networking, is a good, alternate. That can often be used in situations where. Wiring. Is difficult. And. Let's. Go ahead with the network security, treats. Guys. It's, a dangerous. World, out there in. The world wide web, just. As your mother may have told, you to never talk to strangers, the, same advice, holds, true for the, virtual, world you. May know to be, wary, of giving. Strangers. Your business. Bank account details, but.
Can, You be sure website. You are logging into instead. Of your bank, and not, a forged. Created. By a cyber criminal. Cyber. Criminals. Use, many, different methods. To lure, you, into parting. With your confidential. Personal, or business, information. As a small company, doing, business own on the web you, need to be aware, of these, methods, so, you can, be extra, vigilant banned. Online, the. Common, network security, treats, you can face our dos. Attacks. Wireless. Verb, malware. Spam. Phishing. And, something, like that we'll, discuss, deeper, about these concepts, on our, later lessons. And. Yes. We, have security, treats, but. Fortunately. We, have solutions, to to. Mitigate, network, security, treats, we, can use a CL. Access. Control, list which, is a control, mechanism. Firewalls. Which is a network security, device, and. Antivirus. Which, is a network security, software. We. Will also discuss, deeper, about these concepts, on our, later lessons.