Introduction to IP - CompTIA A+ 220-1001 Prof Messer
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The new A+ has a much stronger focus on networking as a key to the certification.
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What are the scenarios in which TCP would be used over UDP, and visa versa?
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Also, I've seen that multiple people can have the same IP address, so how exactly does a server know where to send the data?
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@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
What are the scenarios in which TCP would be used over UDP, and visa versa?
TCP is pretty much anytime you want "reliability". It has the ability to re-request missing packets and put them in the correct order.
UDP is made for speed where you don't care if you've missed a packet or not or even if they are out of order.
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@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
Also, I've seen that multiple people can have the same IP address, so how exactly does a server know where to send the data?
What do you mean exactly?
in every situation i've come across IP conflicts -2 or more devices using the same IP address on a single network- cause quite the head ache... -
@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
Also, I've seen that multiple people can have the same IP address, so how exactly does a server know where to send the data?
I think you're talking about NAT (Network Address Translation) where the external IP address appears the same but the internal address for each client is different and managed either statically or via DHCP.
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@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
Also, I've seen that multiple people can have the same IP address, so how exactly does a server know where to send the data?
No two people can have the same IP address. I'm sure what you are seeing is people on different networks, not people on the same network. And they are behind a NAT device that is giving them a different IP address than the one that you are seeing. You will need to learn about NAT to understand how that is happening.
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@scottalanmiller said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
Also, I've seen that multiple people can have the same IP address, so how exactly does a server know where to send the data?
No two people can have the same IP address. I'm sure what you are seeing is people on different networks, not people on the same network. And they are behind a NAT device that is giving them a different IP address than the one that you are seeing. You will need to learn about NAT to understand how that is happening.
Which comes with the Network+ certificate (if im not mistaken) more so then A+ (right? I remember when I was studying for the Network+ cert it came up.. )
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@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
What are the scenarios in which TCP would be used over UDP, and visa versa?
TCP is a "heavy" connection oriented protocol. UDP is a "light" connectionless protocol. YOU don't choose one or the other, makers of protocols higher up the stack choose TCP or UDP as their underlying protocols to build upon.
So like RTP chooses UDP. And HTTP chooses TCP. But as IT people, we just have to know which one uses what, we don't get to choose which is used.
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@WrCombs said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@scottalanmiller said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
Also, I've seen that multiple people can have the same IP address, so how exactly does a server know where to send the data?
No two people can have the same IP address. I'm sure what you are seeing is people on different networks, not people on the same network. And they are behind a NAT device that is giving them a different IP address than the one that you are seeing. You will need to learn about NAT to understand how that is happening.
Which comes with the Network+ certificate (if im not mistaken) more so then A+ (right? I remember when I was studying for the Network+ cert it came up.. )
Correct. That will definitely be covered there.
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@scottalanmiller said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@WrCombs said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@scottalanmiller said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
Also, I've seen that multiple people can have the same IP address, so how exactly does a server know where to send the data?
No two people can have the same IP address. I'm sure what you are seeing is people on different networks, not people on the same network. And they are behind a NAT device that is giving them a different IP address than the one that you are seeing. You will need to learn about NAT to understand how that is happening.
Which comes with the Network+ certificate (if im not mistaken) more so then A+ (right? I remember when I was studying for the Network+ cert it came up.. )
Correct. That will definitely be covered there.
Will you be posting the Network + links for Professor Messer like you did with A+ ?
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@WrCombs said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@scottalanmiller said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@WrCombs said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@scottalanmiller said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
@connorsoliver said in Introduction to IP - CompTIA A+ 220-1001Prof Messer:
Also, I've seen that multiple people can have the same IP address, so how exactly does a server know where to send the data?
No two people can have the same IP address. I'm sure what you are seeing is people on different networks, not people on the same network. And they are behind a NAT device that is giving them a different IP address than the one that you are seeing. You will need to learn about NAT to understand how that is happening.
Which comes with the Network+ certificate (if im not mistaken) more so then A+ (right? I remember when I was studying for the Network+ cert it came up.. )
Correct. That will definitely be covered there.
Will you be posting the Network + links for Professor Messer like you did with A+ ?
Yup, we will be doing that along with the intern team moving into that material in the next few days after MangoCon wraps up.
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Is there a way to tell if UDP or TCP is being used?
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@mary said in Introduction to IP - CompTIA A+ 220-1001 Prof Messer:
Is there a way to tell if UDP or TCP is being used?
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@WrCombs said in Introduction to IP - CompTIA A+ 220-1001 Prof Messer:
@mary said in Introduction to IP - CompTIA A+ 220-1001 Prof Messer:
Is there a way to tell if UDP or TCP is being used?
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@mary said in Introduction to IP - CompTIA A+ 220-1001 Prof Messer:
Is there a way to tell if UDP or TCP is being used?
In any given case, yes. You can tell because it is what you turn on, you can see it in the network traffic. It's different protocols so everything about it is different.
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Very Interesting!
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This was very informative, I like the simplicity of the explanations. Also @scottalanmiller thanks for the extra feedback! I watched this a week ago btw
