1 00:00:00,540 --> 00:00:02,950 So it's time to start now. 2 00:00:03,090 --> 00:00:09,750 And let's go ahead with our first section introduction to networks in the section we're going to talk 3 00:00:09,750 --> 00:00:22,180 about basics of network Les whens and the Internet and network tunes and security overview. 4 00:00:22,180 --> 00:00:27,980 All right let's go we're starting now training with an interesting graphic. 5 00:00:28,030 --> 00:00:34,830 This graphic shows us number of the ways is connected to the Internet worldwide. 6 00:00:34,930 --> 00:00:36,160 As you can see 7 00:00:38,850 --> 00:00:47,800 there were eight billions of devices connected to the Internet but it is assumed to be 50 billions. 8 00:00:47,880 --> 00:00:50,740 That is a really crazy number of guys. 9 00:00:50,760 --> 00:00:59,940 And that means we will need much more resources such as bandwidth and stronger devices and more secure 10 00:01:00,180 --> 00:01:03,240 networks. 11 00:01:03,270 --> 00:01:06,530 Let's go ahead with the global community networks. 12 00:01:07,110 --> 00:01:15,420 Nowadays we may often need to meet people from different parts of the world especially global companies 13 00:01:15,420 --> 00:01:20,160 can often hold meetings with employers in different locations. 14 00:01:20,490 --> 00:01:28,110 However it can be very difficult for all employees to come together at the same location for each meeting 15 00:01:28,140 --> 00:01:32,010 both in terms of time and cost. 16 00:01:32,010 --> 00:01:38,260 Cisco has two great solutions for eliminating this time and cost problems. 17 00:01:38,280 --> 00:01:46,680 The first solution is video conference video conferencing is a technology that allows users in different 18 00:01:46,680 --> 00:01:53,970 locations to hold face to face meetings without having to move to a single location together. 19 00:01:53,970 --> 00:02:02,430 This technology is particularly convenient for business users in different cities or even different 20 00:02:02,430 --> 00:02:09,840 countries because it saves time expands and hassle associated with business travel. 21 00:02:12,170 --> 00:02:20,030 The second technology we are going to focus on is telepresence video conferencing technology isn't always 22 00:02:20,120 --> 00:02:21,220 able to do so. 23 00:02:21,230 --> 00:02:25,160 Barriers and facilitate remote collaboration. 24 00:02:25,160 --> 00:02:34,340 Cisco TelePresence recreates the meeting room experience so you can meet face to face with your globally 25 00:02:34,340 --> 00:02:36,110 dispersed teams. 26 00:02:36,170 --> 00:02:44,840 Now in-person meetings can be happen without the hassle of travel so you can be more available and more 27 00:02:44,840 --> 00:02:47,360 effective than ever before. 28 00:02:47,540 --> 00:02:56,660 The Cisco TelePresence experience delivers high quality audio and high definition video already reliable 29 00:02:56,750 --> 00:02:58,130 IP network. 30 00:02:58,640 --> 00:03:07,550 Unlike video conferencing your meetings will look and sound as if all the participants are actually 31 00:03:07,550 --> 00:03:09,620 together in the same room. 32 00:03:09,620 --> 00:03:13,530 Here is the telepresence device as you can see in here. 33 00:03:13,550 --> 00:03:17,780 These guys are maybe in par is. 34 00:03:17,780 --> 00:03:21,910 And these guys are for example in Tokyo. 35 00:03:22,190 --> 00:03:27,410 But what they feel is as you can see they're on the same table. 36 00:03:27,410 --> 00:03:31,170 That's a really great and cool technology. 37 00:03:31,190 --> 00:03:37,230 Now let's talk about the variety of networks according to their size. 38 00:03:37,310 --> 00:03:48,590 Small Home Office networks are networks of several pieces laptops and printers and it means basic requirements 39 00:03:48,770 --> 00:03:51,020 such as surfing on the Internet. 40 00:03:51,020 --> 00:04:03,120 For example medium sized networks usually consist about 15 or 20 pieces laptops and just a few printers. 41 00:04:03,120 --> 00:04:13,440 Maybe if these networks also a network was such as savage or rather can be used which we will see in 42 00:04:13,440 --> 00:04:21,050 more detail later let's go ahead with the large and worldwide network. 43 00:04:21,050 --> 00:04:29,780 Large networks are geographically this through building networks in such networks where powerful network 44 00:04:29,780 --> 00:04:34,500 devices are used to provide communication between the ends. 45 00:04:34,520 --> 00:04:43,700 A simple example of these networks is simply Internet or we can think about a global company such as 46 00:04:43,700 --> 00:04:51,860 Cisco and Cisco uses the large networks to provide communication between different locations such as 47 00:04:52,070 --> 00:05:02,170 Cisco Australia Cisco pond and Cisco China an absolute between different buildings let's take a look 48 00:05:02,170 --> 00:05:06,130 to Klein and server concepts now. 49 00:05:06,280 --> 00:05:20,030 These guys are the Klein's and this guy is the so our clients are the devices such as pieces smartphones 50 00:05:20,240 --> 00:05:29,570 and laptops that request a service from the servers and servers are the devices that provide the requested 51 00:05:29,570 --> 00:05:31,660 service to the clients. 52 00:05:31,790 --> 00:05:36,020 Servers are classified by the service they provide. 53 00:05:36,020 --> 00:05:44,390 For example a web server serves as a web page and files server service computer files and something 54 00:05:44,390 --> 00:05:45,270 like that. 55 00:05:45,370 --> 00:05:53,630 The client established that connection to the server over a local area or wider network such as the 56 00:05:53,630 --> 00:05:59,390 Internet maybe once the server has fulfilled the client's request. 57 00:05:59,420 --> 00:06:02,020 The connection is terminated. 58 00:06:02,120 --> 00:06:11,510 For example let's say that this P.C. want to connect with the Google's web page and let's say that this 59 00:06:11,510 --> 00:06:14,080 is the web server off to Google. 60 00:06:14,270 --> 00:06:23,960 If you want to connect Google's web page your PSC is the client which request the web page and Google's 61 00:06:23,960 --> 00:06:33,340 web server provides you the requested service which is a web page for this situation. 62 00:06:33,540 --> 00:06:42,670 And let's go ahead with the lands winds and the Internet let's first talk about the ways that we can 63 00:06:42,670 --> 00:06:44,740 use in our network. 64 00:06:44,740 --> 00:06:53,740 There are two types of devices and there and devices and the infrastructure devices the network devices 65 00:06:53,770 --> 00:07:01,260 that people are most familiar with are called and devices are hosts. 66 00:07:01,270 --> 00:07:08,830 These devices form the interface between users and the underlying communication network. 67 00:07:08,830 --> 00:07:18,580 Some examples of end devices are computers network burners VOIP phones telepresence employees security 68 00:07:18,580 --> 00:07:21,940 cameras and something like that. 69 00:07:21,940 --> 00:07:30,840 Infrastructure devices are the devices that helps to provide communication between different and devices. 70 00:07:30,850 --> 00:07:39,970 For example you can communicate different pieces by using switch on the same local area network as an 71 00:07:39,970 --> 00:07:40,900 example. 72 00:07:40,900 --> 00:07:51,860 We can do surveys access points routers and firewalls to the infrastructure devices and let's go ahead 73 00:07:51,860 --> 00:07:54,830 with the network media network. 74 00:07:54,830 --> 00:08:05,030 Media refers to the communication channels used to interconnect nodes on a computer network in a network. 75 00:08:05,030 --> 00:08:14,870 We can put communication in two ways and they're wired and wireless in a VOD media. 76 00:08:14,930 --> 00:08:23,630 We use different types of cables such as copper cable or fiber optic cable to provide communication 77 00:08:23,630 --> 00:08:32,990 between different devices wireless network media provides communication between two or more networking 78 00:08:32,990 --> 00:08:37,090 devices that are not connected by a cable. 79 00:08:37,100 --> 00:08:43,450 The most common wireless technologies use radio waves with radio waves. 80 00:08:43,460 --> 00:08:53,330 Distances can be sharp such as a few meters for Bluetooth or as far as millions of kilometres for deep 81 00:08:53,330 --> 00:09:05,960 space radio communications and network infrastructures can where I greatly in terms of size of the area 82 00:09:06,260 --> 00:09:13,790 covered numbers of connected users numbers and types of services available. 83 00:09:13,790 --> 00:09:26,240 Basically we have four types of networks and they are local area network wider network Metropolitan 84 00:09:26,240 --> 00:09:30,350 Area Network and Storage Area work 85 00:09:33,030 --> 00:09:44,100 local area network LAN is a network infrastructure that provides access to users and and devices in 86 00:09:44,100 --> 00:09:54,600 a small geographical area learns the interconnect and devices in a limited the area such as a home school 87 00:09:54,870 --> 00:10:07,150 office building or campus and land is usually administered by a single organization or the individual. 88 00:10:07,310 --> 00:10:16,340 Let's go ahead with the wider network wider in a work van is a network infrastructure that provides 89 00:10:16,490 --> 00:10:20,990 access to other networks over wide geographical area. 90 00:10:21,020 --> 00:10:23,750 This is the difference from the local area network. 91 00:10:23,750 --> 00:10:33,320 Winds are typically managed by service providers or Internet service providers and they interconnect 92 00:10:33,500 --> 00:10:43,610 different local area networks over wide geographical areas such as between these states provinces countries 93 00:10:43,610 --> 00:10:45,050 or something like that. 94 00:10:45,320 --> 00:10:55,610 In the figure you see a van infrastructure and here there is a London office in here. 95 00:10:55,830 --> 00:10:58,730 There is a Dallas office in here. 96 00:10:58,770 --> 00:11:07,720 There is a Washington office and in here there is a barrel and local area work and wider network interconnects 97 00:11:07,960 --> 00:11:14,700 this different local area networks between different countries. 98 00:11:14,740 --> 00:11:23,290 Let's go ahead with Metropolitan Area Network and man is the network infrastructure that spans a physical 99 00:11:23,290 --> 00:11:33,550 area larger than a local area network but smaller than a wider network man's metropolitan area networks 100 00:11:33,940 --> 00:11:44,960 are topically operated by a single entity such as a large organization a storage area network is a network 101 00:11:44,990 --> 00:11:53,740 infrastructure designed to support file servers and provide data storage retrieval and replication. 102 00:11:53,930 --> 00:12:05,900 It involves high end servers multiple disk arrays and Fibre Channel interconnection technology although 103 00:12:06,200 --> 00:12:11,880 there are benefits using locally network or wider network. 104 00:12:11,900 --> 00:12:19,760 Most individuals need to communicate with a resource on another network outside of the local network 105 00:12:19,760 --> 00:12:23,690 within the home campus or organization. 106 00:12:23,690 --> 00:12:27,720 This is done using the Internet. 107 00:12:27,770 --> 00:12:37,040 The Internet is a worldwide collection of interconnected networks cooperating with each other to exchange 108 00:12:37,070 --> 00:12:46,520 information using common standards through telephone wires fiber optic cables wireless transmissions 109 00:12:46,880 --> 00:12:48,940 and satellite lengths. 110 00:12:49,040 --> 00:12:58,990 Internet users can exchange information in a variety of forms but how we can connect to Internet. 111 00:12:58,990 --> 00:13:00,990 We have some options for this. 112 00:13:01,060 --> 00:13:10,900 The first option we're going to check as DSL digital subscriber line technology digital subscriber line 113 00:13:10,930 --> 00:13:19,750 is a family of technologies that are used to transmit digital data over telephone lines in telecommunications 114 00:13:19,750 --> 00:13:30,600 marketing the term DSL is widely understood to mean a DSL the most commonly installed DSL technology 115 00:13:30,600 --> 00:13:39,210 for Internet access DSL service can be delivered simultaneously with what a phone service on the same 116 00:13:39,210 --> 00:13:45,470 telephone line since DSL uses higher frequency bands for data. 117 00:13:45,470 --> 00:13:49,440 Here is how we can connect to Internet by DSL. 118 00:13:49,440 --> 00:13:51,270 Here is your computer to us. 119 00:13:52,800 --> 00:14:00,510 And you collect your computer's network interface card through. 120 00:14:00,630 --> 00:14:15,600 Was named more than this modem device is connected to a little otherwise little equipment named splitter 121 00:14:17,180 --> 00:14:22,490 which splits the telephone and the data frequencies. 122 00:14:22,490 --> 00:14:34,010 The other side of the splitter is connected to your phone and splitter is connected to 123 00:14:37,240 --> 00:14:38,740 the wise name. 124 00:14:38,760 --> 00:14:43,560 The Islam on the ISP side and this. 125 00:14:43,560 --> 00:14:45,560 This is 126 00:14:49,320 --> 00:14:52,980 connected to ISP backbone and this backbone. 127 00:14:53,820 --> 00:14:59,090 Takes you to the Internet simply. 128 00:14:59,240 --> 00:15:07,460 You can also connect to Internet by using cellular or mobile network a cellular network or mobile network 129 00:15:07,460 --> 00:15:11,930 is a communication network where the last link is wireless. 130 00:15:11,930 --> 00:15:16,960 The network is distributed over land areas called cells. 131 00:15:17,090 --> 00:15:27,110 It's served by at least one fixed location transceiver but normally three cell sites or base Transceiver 132 00:15:27,290 --> 00:15:28,600 Stations. 133 00:15:28,760 --> 00:15:39,020 The most popular cellular network in communications are 3G 4G and that's going to be 5G in the future 134 00:15:41,030 --> 00:15:41,890 satellite. 135 00:15:41,900 --> 00:15:48,710 Internet access is the Internet access provider through communication satellites. 136 00:15:48,950 --> 00:15:58,430 Modern consumer grade satellite Internet service is typically provided to individual users through geostationary 137 00:15:58,430 --> 00:16:06,180 satellites that can offer relatively high data speeds up to 50 megabits per second. 138 00:16:06,940 --> 00:16:11,530 And here's how we can connect to Internet by using satellites. 139 00:16:11,530 --> 00:16:17,520 Here is our P.S. And our P.S. is connected to satellite rather. 140 00:16:17,590 --> 00:16:26,840 This time satellite rather is connected to the antenna and these antennas are communicating each other 141 00:16:26,840 --> 00:16:40,080 by using satellite this satellite for its packets through internet site and you can access the Internet 142 00:16:40,140 --> 00:16:47,690 by using this antenna and Nook hop and other internet connection. 143 00:16:47,690 --> 00:16:56,050 Option is Metro Ethernet Metro Internet network is a metropolitan area network that is based on Internet 144 00:16:56,050 --> 00:16:57,370 standards. 145 00:16:57,370 --> 00:17:04,690 It's commonly used to connect subscribers to a larger service network or the Internet. 146 00:17:04,780 --> 00:17:13,360 Businesses can also use metropolitan area Ethernet to connect their own offices to each other and in 147 00:17:13,360 --> 00:17:14,400 the third step. 148 00:17:14,440 --> 00:17:23,440 We'll talk about network trends and security overview the first one we're going to talk about is the 149 00:17:23,470 --> 00:17:27,020 why or the bring your own device. 150 00:17:27,340 --> 00:17:35,710 Bring your own device refers to the policy of permitting employers to bring personally own devices such 151 00:17:35,710 --> 00:17:45,400 as laptops tablets and smartphones to their workplace and to use those devices to access privileged 152 00:17:45,400 --> 00:17:52,310 company information and applications and let's go ahead with the. 153 00:17:52,310 --> 00:17:55,930 Another trend which is online collaboration. 154 00:17:55,940 --> 00:18:05,470 Simply put online collaboration lets a group of people work together in real time over the Internet. 155 00:18:05,570 --> 00:18:14,150 Those engaged in online collaboration can work together on word processor documents PowerPoint present 156 00:18:14,150 --> 00:18:23,710 presentations and even for brainstorming all without needing to be in the same room at the same time 157 00:18:25,060 --> 00:18:28,720 there another trend is cloud computing. 158 00:18:28,730 --> 00:18:38,050 Cloud computing is a delivery of computing services such as servers storage databases networking softwares 159 00:18:38,050 --> 00:18:44,780 or something like that over the Internet which is known as the cloud. 160 00:18:44,990 --> 00:18:54,740 Companies offering these competing services are called cloud providers and topically charge for cloud 161 00:18:54,740 --> 00:19:04,690 computing services based on usage similar to how you are billed for water or electricity at home. 162 00:19:04,940 --> 00:19:13,520 Instead of having to invest heavily in data centers and servers before you know how you are going to 163 00:19:13,520 --> 00:19:22,540 use them you can only pay when you consume competing resources and all the pay for how much you consume 164 00:19:24,180 --> 00:19:27,010 and let's go ahead with the data centers. 165 00:19:27,120 --> 00:19:36,180 A data center is a facility composed of networked computers and storage that businesses business or 166 00:19:36,450 --> 00:19:45,860 other organizations used to organize process store and this emanate large amounts of data. 167 00:19:45,870 --> 00:19:54,230 Data centers are not a single think guys but rather a conglomeration of elements. 168 00:19:54,240 --> 00:20:03,690 At a minimum data centers serve as the principal repositories for all manner of I.T. equipment including 169 00:20:03,690 --> 00:20:14,130 servers storage subsystems networking tweets Rather's and firewalls as well as the cabling and physical 170 00:20:14,130 --> 00:20:23,610 racks used to organize and interconnect the I.T. equipment a data center must also contain an etiquette 171 00:20:23,700 --> 00:20:32,160 infrastructure such as power distribution and supplemental power subsystems including electrical switching 172 00:20:32,550 --> 00:20:39,050 on interoperable power supplies backup generators and so on. 173 00:20:39,120 --> 00:20:48,030 When isolation and datacenter cooling systems such as computer room air conditioners and other kit provisioning 174 00:20:48,030 --> 00:20:59,210 for network carrier connectivity and let's take a look to the smart houses a smart home is a residence 175 00:20:59,270 --> 00:21:08,690 that uses Internet connected devices to enable the remote monitoring and management of appliances and 176 00:21:08,690 --> 00:21:18,410 systems such as lighting and here think smart home technology also known as the home automation provides 177 00:21:18,680 --> 00:21:28,610 homeowner security comfort convenience and energy efficiency by allowing them to control smart devices 178 00:21:28,850 --> 00:21:34,100 often by a smart home application on their smartphone. 179 00:21:34,100 --> 00:21:42,890 For example when you are outside on a hot summer day you can cool your home by running the air conditioner 180 00:21:43,190 --> 00:21:46,010 remotely by using your smartphone 181 00:21:48,800 --> 00:21:57,440 and another trend is Power Line networking power line networking as its name implies uses your existing 182 00:21:57,530 --> 00:22:02,030 electrical power cabling to transmit digital data. 183 00:22:02,030 --> 00:22:06,550 In this case it is used to transfer your networking data. 184 00:22:06,560 --> 00:22:16,130 This can essentially be told of acting like a wire network where your electrical wiring replaces a large 185 00:22:16,130 --> 00:22:20,390 segment of unsightly Internet cable power line. 186 00:22:20,390 --> 00:22:31,160 Networking is a good alternate that can often be used in situations where wiring is difficult and let's 187 00:22:31,160 --> 00:22:34,870 go ahead with the network security threats. 188 00:22:34,880 --> 00:22:43,940 Guys it's a dangerous world out there in the world wide web just as your mother may have told you to 189 00:22:43,940 --> 00:22:46,260 never talk to strangers. 190 00:22:46,280 --> 00:22:50,590 The same advice holds true for the virtual world. 191 00:22:50,810 --> 00:22:57,650 You may know to be wary of viewing strangers your business bank account details. 192 00:22:57,950 --> 00:23:00,020 But can you be sure. 193 00:23:00,030 --> 00:23:09,180 Web site you're looking into is that of your bank and not a folder created by a cyber criminal cyber 194 00:23:09,180 --> 00:23:10,010 criminals. 195 00:23:10,110 --> 00:23:19,310 Use many different methods to lure you into parting with your confidential personal or business information. 196 00:23:19,470 --> 00:23:27,600 As a small company doing this on its own on the Web you need to be aware of these methods so you can 197 00:23:27,600 --> 00:23:36,990 be extra vigilant when online the common network security treats you can face are those attacks wires 198 00:23:37,140 --> 00:23:42,610 worm malware spam phishing and something like that. 199 00:23:42,660 --> 00:23:54,400 We'll discuss deeper about this concept on our later lessons and yes we have security threats but fortunately 200 00:23:54,400 --> 00:23:59,180 we have solutions to to mitigate network security threats. 201 00:23:59,290 --> 00:24:08,770 We can use ACL access control list which is a control mechanism firewalls which is a network security 202 00:24:08,770 --> 00:24:14,700 device and antivirus which is then network security software. 203 00:24:14,710 --> 00:24:20,140 We will also discuss deeper about this concept on our later lessons.