Comments by "Javier Flores" (@JJFlores197) on "NetworkChuck"
channel.
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Yes the switch doesn't understand IP addresses. The computer uses a protocol called ARP -Address Resolution Protocol. In short, ARP maps IP addresses to MAC addresses. So when you ping a computer, your PC sends out an ARP packet. It basically asks in the network, what is the MAC address of this IP address? All devices on the network receive this since its a broadcast frame. however, all devices except the intended recipient will discard the broadcast frame since its not meant for them.
The intended device will respond back to your PC with its MAC address. At this stage, the PC will remember that MAC and IP address and create an entry in its ARP cache. After that, the PC will send a packet with the destination IP address. Inside of this packet, is a frame which now contains the other PC's MAC address. The switch receives this packet, but it discards the layer 3 header, since again, it doesn't understand IP address. It only cares about the layer 2 header which contains the source and destination MAC addresses. It will then forward the frame to the intended destination.
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I highly doubt it. These videos are pretty good to help give you a general understanding of some networking concepts. However, at least with the videos he currently has, there is still a lot (and I mean a lot) of information that is missing. From what I recall, he hasn't gone over a lot of topics, or if he did, it was brief like: subnetting, VLANs, routing protocols, switching technologies, trunking, ACLs, actually configuring a router and a switch, etc.
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Its up to you. However, a lot of these higher level IT concepts build on each other. For cyber security, it helps to have a good understanding of computer networks. Think about it. A lot of computers get hacked through their network. If you don't know anything about computer networks, it likely will be difficult to understand parts of your cyber security training like ARP spoofing attacks, MITM attacks, etc.
If you want to be a car mechanic, for instance, you need a solid understanding of all of the components in a car, how they work, and how their job affects the car as a whole. If you know nothing about how cars work and try jumping straight engine performance and tuning, you're going to have a pretty tough time understand what's going on.
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As an IT tech for a school district, having tickets helps us techs keep track of the work we have to do. I work at 5 school sites with nearly 150 staff members. Without a ticketing system, it would be incredibly difficult for me to know what I need to do at each school site each day. The ticket system has the tickets that staff members have put in and we work on them based on priority. Things like virus, network infrastructure, projector not working, etc are at the top of our list whereas things like not being able to print or needing extra headphones are at the bottom of our list.
The ticket system also shows the boss that we have work to do and not just hanging out at a site for 8 hours a day. The analytics can show him the number of tickets at a school site and how much time I spend working on them. That way, I can justify my time at a school and he can justify me being there to his boss. If you were to just email me, sure I could do the work, but I wouldn't have a 'paper trail' of the work I did.
But yes, I do agree that some techs do drag their feet, so to speak, with tickets. That's the unacceptable thing.
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One thing to keep in mind with his videos is that he doesn't go as in-depth as he should if we wants to call them "free ccna". He's a good presenter and his videos are pretty good at giving you a high-level overview. Its fine if you're a beginner but when you want to go deeper his videos aren't that great. Just throwing that out there.
To answer your question: In most home and small business networks, the DNS server is part of the router. The router does multiple things: routing, switching, wifi access, DHCP server, DNS server, etc. This is for the sake of convenience and simplicity for average home users. In the more complex and larger network environments, there are usually separate devices handling different things. For instance, you can have a router that's just focused on routing, you can have a server dedicated to DHCP, a server dedicated to DNS, and so forth.
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Nope. You want to use other resources as well. He's a good presenter, but at least so far, this course is far from being complete. He gives you a very good high-level overview of different topics, but he doesn't go very in-depth as he should for calling it a CCNA course. He hasn't really gone over any Cisco-specific stuff like commands and concepts. There's still a lot (and I do mean a lot) of topics he hasn't covered, or if he did, it was brief. Things like subnetting, routing protocols, switching, VLANs, ACLs, NAT, and actual configuration are missing.
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