Free CCNA | Network Devices | Day 1 | CCNA 200-301 Complete Course

Free CCNA | Network Devices | Day 1 | CCNA 200-301 Complete Course

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00:01
welcome to my complete CCNA Cisco Certified Network Associate course this is Jeremy's IT lab since this is the first video allow me to introduce the course this course aims to be a complete course for the CCNA including everything you need to pass the exam all 100% free there will be lecture videos covering every topic on Cisco's official exam topics list practice quizzes covering
00:31
the material in each lecture flash cards to help you review and remember what you learned practice labs using Cisco's network simulation software packet tracer and at the end multiple practice exams to get you ready for the real thing although this course will be based on Cisco's official exam topics list I also want to give you extra information to improve your understanding of networks in general that additional context should also help you understand the exam topics because this is the
01:04
first video in the series I want to talk about who this course is for this course is for anyone who wants to pass the CCNA 200 - 301 exam at the time of recording this video this is a new exam that isn't released yet but will be coming on February 24th 2020 although a lot of the information will overlap with the old CCNA the course will be based on the exam topics for the 200 - 301 exam this
01:36
course is for anyone who wants to learn about computer networking you don't necessarily have to take the CCNA 200 - 301 exam this course will cover lots of valuable information regarding computer networking even if you're not aiming for the CCNA the only requirement for this course is that you have a basic familiarity with computers I will cover all of the foundational networking knowledge at the beginning of the course so you don't need any prior knowledge of networking and you also don't need to
02:08
know programming or anything like that to start this course with no further ado let's get started our first lesson will cover network devices this knowledge will be the foundation which we will build upon during the rest of this course take a look at this sample network here do you know what each of these symbols represents and their function in a network at the end of this lesson you'll know these and more and how they
02:38
work together to make a network we won't go into too many details in this lesson there's plenty of time to dig deeper in future lessons but these first few videos are meant to give you the foundational knowledge which we will build upon in future lessons so what is a network let's ask our friends at Wikipedia a computer network is a digital communications network which allows nodes to share resources well if
03:09
you didn't understand before you probably still don't after reading just that let's look further the definition states that a network allows nodes to share resources what is a node I'll introduce some types of network nodes here some of which appeared in the sample network on the previous slide this is a router you've probably heard the word before and have a general idea of what a router is but I'll explain a routers function in this
03:40
lesson next this is a switch maybe you're familiar with what a switch is maybe not it serves a different function than a router but is also similar in many ways this next one is a firewall you're probably familiar with firewalls and you most likely have a firewall installed on your computer that's a software firewall but large networks usually have a hardware firewall a separate Network appliance
04:12
which helps protect the network this next symbol represents a server if you know computers you surely have heard of servers before what exactly do they do well if you're watching this video you're getting it from a server on the Internet the last symbol on this slide is a client you're using a client to watch this video whether it's a smartphone a laptop a desktop PC or whatever what
04:43
exactly is a client let's get into it over the next few slides let's build a sample network and look at the functions of each of these network nodes in the network you might also hear clients as well as the previous node type servers referred to as n hosts or and points ok so we looked at some types of network nodes but we didn't really examine exactly what each type of node does in a network let's build a network and
05:16
examine each nodes role so here we have 2 pcs PC one on the left and PC 2 on the right as is this isn't a network however if I connect them together with a cable we now have a network that's right two pcs connected together actually makes a network now it's a very simple network but if we take a look at that Wikipedia definition once more a computer network
05:49
is a digital telecommunications network which allows nodes to share resources now that these two nodes are connected they can share resources and essentially have a conversation with each other now I'm representing clients with this symbol but there are all kinds of devices which can be network clients for example a laptop or desktop PC running Microsoft Windows or how about an iMac
06:20
running Mac OS or even an Apple iPhone running iOS these are just a few examples of devices which can be network clients so let's give a simple definition of a client a client is a device that access is a service made available by a server okay since server is part of the definition of a client to understand one you have to understand the other so what's a server
06:52
let's take a look I use this symbol to represent a server when you think of the word server you may think of something like this IBM server or this Dell server and indeed these are powerful servers and you'll see rows and rows of servers like these in data centers however not all servers look like this in fact any of the clients we looked at in the previous slide can be servers too
07:23
how is that possible well let's look at the definition of a client again and then compare it to the definition of a server the definition we used for a client was a client is a device that accesses a service made available by a server so we can basically reverse that definition to know what a server is a server is a device that provides functions or services for clients so
07:56
let's look at the simple network of two pcs connected with a cable that we saw before remember this network watch this little exchange between the two pcs and think which of them is the server and which is the client PC one asks PC two for the file image/jpeg PC two responds and sends the requested image file so which is the client and which is the server
08:27
well PC one is the one requesting the service requesting for the image to be sent and PC two is the one providing the service the one sending the image so that makes PC 1 the client and PC to the server let's look at another example of a client-server relationship on the left is your computer or perhaps your smartphone whatever you're using to watch this video on the right is a YouTube server which contains
08:59
this video what do you think the blue cloud in the middle represents the answer is the Internet in network diagrams a cloud is often used to represent the internet or in any situation where the details of that part of the network aren't necessary the Internet is a very complex network and for the sake of this diagram all we need to know is that data from your computer passes through the internet to reach the YouTube server the exact details of the
09:31
Internet aren't important for this diagram so we can simply use this cloud to represent the Internet so your computer sends a request to the YouTube server for this YouTube page including the video and YouTube server sends the data passing through the internet back to your PC however YouTube doesn't send the data all at once it sends you a stream of data until you've watched the whole video for one more example let's
10:04
say you want to get a video from your friend you both have iPhones so you ask him to send you the video by air drop your phone requests the video and his phone responds sending the video you probably know it by now but which phone is the client and which is the server as you probably guessed your phone on the left is the client and your friends phone on the right is the server to
10:34
review once more a client is a device that accesses a service made available by a server and a server is a device that provides functions or services for clients also keep in mind the same device can be a client in some situations and a server in other situations okay hopefully you have a better idea of what a client is and what a server is now let's build out the network further and show the next part
11:05
of connection between end hosts and the Internet let's say this is a network for an enterprise and this enterprise has a branch in New York and a branch in Tokyo of course a real enterprise branch will have more than just a couple pcs or a couple servers but I also couldn't fit an entire network on this one slide now typically you don't connect n hosts like pcs or servers directly to each other you aggregate the connections to a
11:37
device called a switch as you can see the two pcs are connected to switch one and the two servers are connected to switch two switches has lots of interfaces for you to connect and hosts to look at this Cisco Catalyst switch as you can see lots of interfaces or ports to plug your PC's or servers into switches are used to forward traffic within a LAN
12:07
a local area network pc1 & pc2 as well as other devices plugged in to switch one such as a network printer or another pc all reside on the same local area network the same goes for any devices connected to switch 2 in the Tokyo branch so we have one LAN on the left and one LAN on the right the hosts within each LAN can send data to each
12:38
other for example pc1 to pc2 however these switches cannot connect directly to the internet and send data between the two lands so let's talk more about switches here on the left is the same Cisco switch from the last slide it's a catalyst 9200 model switch on the right is a catalyst 3650 model switch catalyst
13:11
switches are Cisco's enterprise-grade switches used by many enterprises to connect their lands now let's review some characteristics of switches switches have many network interfaces or ports for end hosts such as pcs to connect to usually 24 or more switches provide connectivity to hosts within the same land meaning local area network will cover the details of LANs
13:41
later but for now just know it means end hosts within the same area like a bunch of computers on one floor of an office or perhaps an entire small office or your home network finally switches do not provide connectivity between lands or over the Internet to do so we need another kind of network device that device is a router we can connect the switches to routers like this and then connect the
14:15
routers to the internet when an hosts in the New York branch land want to communicate with end hosts in the Tokyo branch land they will send the data to their router r1 which will then forward it to the Tokyo branch land via the internet for example if PC one in the New York branch wants a file on server one in the Tokyo branch it will send the request to r1 via switch 1 which will then forward it over the internet to r2
14:49
which will then send it to server 1 via switch to the reply will then follow the reverse path back to PC 1 so let's talk about some of the characteristics of routers these are a few examples of cisco routers you might find in use in an enterprise network the ISR 1000 and is our 4000 have their network interfaces on the back but if you look
15:20
at the ISR 900 you can probably notice a difference between a router and a switch let's bring up one of the switches we looked at before compared to this catalyst 9200 series switch the is our 900 router has relatively few network interfaces that's one characteristic of routers compared to switches routers have fewer network interfaces than switches also remember that switches are used to
15:52
forward data within a LAN routers do the opposite routers are used to provide connectivity between lands and because of that routers are therefore used to send data over the internet here's our network once again but this time there's a difference there is an attacker somewhere in the internet with an arsenal of many ways you could attack our networks to steal information or
16:21
otherwise damage our enterprise although routers can also provide some basic security features what we should really be using to protect our networks is a firewall firewalls are specialty network security devices that control network traffic entering and exiting your network firewalls can be placed outside of your router like firewall one or inside of your network like firewall two
16:52
what's important is that they protect the end hosts inside like the PCs and servers in this network firewalls must be configured with security rules to determine which traffic should be allowed and which should be denied if you configure the rules properly if PC one in the New York branch tries to access server one in Tokyo the firewalls should permit the traffic through the return traffic from server one to PC one
17:24
should be allowed as well however if the attacker tries to access anything inside of our networks the firewall should block it so let's look at a couple of Cisco's firewalls at the top here are two examples of cisco firewalls on the left is an a sa 5500 x-series firewall the a sa or adaptive security appliance is Cisco's classic firewall
17:56
although the a sa is their classic firewall modern ASA's include modern features of so-called next-generation firewalls including things like IPS or intrusion prevention system you'll hear a lot more about that in the security section of this course on the right is a firepower 2100 series firewall this is a next-generation firewall as well ok let's review some characteristics of
18:27
firewalls firewalls monitor and control network traffic based on configured rules you explicitly configure which network traffic should be allowed into your network and which should not firewalls can be placed inside the network or outside the network meaning the firewall can filter traffic before it reaches the router or after hit has passed through the router in some cases you might have a firewall inside and
18:59
outside the network firewalls are known as next-generation firewalls when they include more modern and advanced filtering capabilities both of these cisco firewalls are considered next-generation firewalls now I have one more thing to look at regarding firewalls what about the firewall on your computer let's take a brief look the two firewalls we looked at in the previous slide are Network firewalls Network
19:32
firewalls are hardware devices that filter traffic between networks these are the kind of firewall we will focus on in this course as it is a networking course however there are also host-based firewalls host-based firewalls are software applications that filter traffic entering and exiting a host machine like a PC your PC on certainly has a software firewall installed as it should even in a network
20:03
with the hardware firewall each PC should include a software firewall as an extra line of defense ok now we're back to our definition of a network do you understand more about each of these types of network nodes keep in mind there are other kinds of network devices and we'll cover some of those later in this course stay tuned for this lectures supplementary materials which will help you review and test your knowledge in the next lecture we will
20:35
look at the next two sentences of this Wikipedia definition of a computer network focusing on the various kinds of connections between these network devices for this lecture and all other lectures there will be supplementary materials to help you practice and improve your understanding there will be three primary resources end of video quizzes after each video this videos quiz will be coming up right after this
21:06
slide there will also be pre-made flashcards to review the lectures material using the flashcard software on key these flashcards will be included in the description of each video since this is the first video however I will make a separate video explaining how to download and use the Anki software if you already know how to use on key feel free to download this videos flashcards in the description and get started otherwise wait for the next video and
21:39
I'll show you how just one recommendation as I will upload a separate flashcard deck for each video instead of having many separate decks I recommend you create one CCNA deck and then transfer the new cards to that central deck finally there will be a practice lab using Cisco's network simulation software packet tracer for each and every video I will release separate videos for these practice labs and will include the packet
22:11
sir file in the descriptions of those videos so you can download them and complete them yourself the packet tracer lab for this video will be a demonstration of how to download packet tracer and get started with it now let's go onto this videos quiz select the best answer from the available choices in some cases there are multiple answers that could possibly be correct but there will always be one best choice Cisco exams tend to have lots of questions
22:43
like that so hopefully some of these we'll be able to test you in a similar manner this first videos quiz questions however shouldn't be too difficult your company wants to purchase some Network hardware to which they can connect the 30 pcs in your department which type of network device is appropriate a a router be a firewall see a switch or D a server
23:14
pause the video to think about your answer the answer is see a switch let's analyze each of the incorrect answers first than the correct answer a router like this Cisco is our 900 series router is designed for forwarding traffic between networks not for connecting lots of end hosts like pcs to also a router will not typically have 30 network interfaces to connect host to so
23:50
a a router is incorrect a firewall like this cisco a SI 5500 x-series firewall is designed to filter traffic as it enters and exits the local network it is not designed to connect directly to end hosts and typically will not have enough network interfaces for 30 hosts so be a firewall is incorrect a server is an end host itself not a networking device to
24:22
which you will connect other end hosts Sodhi a server is incorrect a switch like this Cisco Catalyst 9200 series switch is designed to connect many end hosts in the same land together they include many network interfaces to connect host to so see a switch is the correct answer okay let's go on to the next question you received a video file from your
24:54
friends apple iphone using airdrop what was his iPhone functioning as in that transaction a a server be a client or see a local area network pause the video to think about your answer the answer is a a server let's check the answers in this case your iPhone not your friend's iPhone is functioning as a client a client
25:30
accesses a service it does not provide a service so be a client is incorrect an end host like an iPhone does not function as a local area network LAN by itself it can however be a part of a local area network so see a local area network is incorrect a server is a device that provides functions or services for clients in this case your
26:02
friend's phone provided the file to your iPhone so a a server is the correct answer let's go to the next question what is your computer or smartphone functioning as while you watch this video a a server be an end host or see a client pause the video to think about your answer the answer is C a client
26:36
let's check the answers your device is receiving a service not providing one so it is not functioning as a server therefore a a server is incorrect although your device is an end host that does not describe its function both servers and clients are end hosts in a network so be an end host is incorrect your device is receiving a service from
27:08
YouTube servers therefore it is functioning as a client so see a client is the correct answer let's go to the next question your company wants to purchase some Network hardware to connect its separate networks together what kind of network device is appropriate a firewall be a host see a LAN or D a
27:38
router pause the video to think about your answer the answer is D a router let's check although a firewall can connect multiple networks together it's real purpose is to monitor and control traffic as it enters and exits the network so a a firewall is not the best answer the term host can refer to any type of
28:09
network node so be a host is incorrect LAN stands for local area network a LAN is not a network device itself so see a LAN is incorrect a router is a device that is designed to connect and forward network traffic between multiple networks so D a router is the correct answer let's go to the final quiz question for this video your company
28:42
wants to upgrade its old network firewall that has been in use for several years - one that provides more advanced functions what kind of firewall should they purchase a a host-based firewall be a next level firewall C a next-generation firewall or D a top layer firewall pause the video to think about your answer the
29:15
answer is C a next-generation firewall let's check each answer a host-based firewall is a piece of software that runs on an end host like the firewall on your computer it is not a network firewall so a a host-based firewall is incorrect next level and top layer are not actual types of firewalls so B and D are incorrect but next generation
29:47
firewall combines traditional firewall features with more advanced filtering functionalities so see a next-generation firewall is correct thank you for watching that's all for this video if you want to show your support please subscribe to the channel like the video leave a comment and share the video with anyone else studying for the CCNA I also accept donations via cryptocurrency or patreon via the links in the
30:20
description that's all for now

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