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  1. #761
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    Need some advice on learning networking

    BillyCarpenter's Avatar
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    Re: Need some advice on learning networking

    Quote Originally Posted by KenB View Post
    I was laid off for about a year and a half, and had all kinds of time on my paws.

    Now Iím back to workiní for the man, and my spare time is scarce again.

    Gotta sayÖIt feels really good to be back at work. And as Joni Mitchell so elegantly put it, ďDonít it always seem to go, that you donít know what you got Ďtil itís goneĒ. Couldnít be more true!


    Glad that you're working again. But you better find some time to post on here.

  2. #762
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    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Mastering the "life of a packet" is proving to be more difficult than it first appeared. I've found that most topics covered in the CCNA exam are intended to be analyzed and dissected from every angle.

    For example: The "life of a packet" is basically teaching how to troubleshoot a network at the WireShark level.

    What do you guys think about troubleshooting a network at the WireShark level? Necessary? Overkill?

    I have my own thoughts and will share after we get some feedback on the question.

  3. #763
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    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Here's an interesting question for all you networkers:


    How does your PC know how to contact the Default Gateway and can you explain the steps involved in doing so? As always...no using Google.

  4. #764
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    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    Here's an interesting question for all you networkers:


    How does your PC know how to contact the Default Gateway and can you explain the steps involved in doing so? As always...no using Google.

    Instead of me explaining it, this is the instructor in one of the courses that I'm talking.



  5. #765
    Service Manager 2,500+ Posts
    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    Here's an interesting question for all you networkers:


    How does your PC know how to contact the Default Gateway and can you explain the steps involved in doing so? As always...no using Google.

    In easy to understand language, the PC knows it needs to connect to the default gateway only when it's trying to send a packet to a different network. Bascially what the PC does is compare the destination IP address with it's own address and if it's on a different subnet it knows to contact the default gateway.

    There's only one small problem. The PC doesn't know the MAC Address of the default gateway. How does the PC find the MAC address of the default gateway? Hhhmmmm.....

  6. #766
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    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    How does the PC find the MAC address of the default gateway? Hhhmmmm.....
    Arp?
    When you think you have made a procedure idiot proof your company employs a better idiot.

  7. #767
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    Re: Need some advice on learning networking

    Quote Originally Posted by skynet View Post
    Arp?

    Very good, skynet. That is correct. As I've been saying, ARP is the Rockstar of networking protocols. Or maybe a better analogy would be that ARP is the lead singer of a rock band??!!

    In any event, before the day is done, the topic of moving a packet is gonna get much deeper and more complicated.

  8. #768
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    Re: Need some advice on learning networking

    Tracing a packet has taken me on an unexpected journey.


    I think most people are familiar with the PING COMMAND. But I doubt too many fully understand it and could interpret it on WireShark. As I type this, I'm working to to fully understand it.

  9. #769
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    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    Very good, skynet. That is correct. As I've been saying, ARP is the Rockstar of networking protocols. Or maybe a better analogy would be that ARP is the lead singer of a rock band??!!

    In any event, before the day is done, the topic of moving a packet is gonna get much deeper and more complicated.
    Thanks that came from memory, I prefer short to the point video's, but then I ain't taking a networking course.
    ARP Explained - Address Resolution Protocol - YouTube
    When you think you have made a procedure idiot proof your company employs a better idiot.

  10. #770
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    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Quote Originally Posted by skynet View Post
    Thanks that came from memory, I prefer short to the point video's, but then I ain't taking a networking course.
    ARP Explained - Address Resolution Protocol - YouTube

    I watched the first couple of minutes of the video you linked to and it did a great job of explaining ARP.


    But in the course I'm taking, I must observe ARP as a packet travels across routers and switches and that's where it gets tricky. Think of it like this: Routers are used to move data from one network to the other. Mac Addresses are used to move data to the "next hop". I'll explain more about it in a bit.

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