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What changes on a frame as it passes...

Discussion in 'Networks' started by albertc30, Jun 10, 2009.

  1. albertc30

    albertc30 Kilobyte Poster

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    Hello everybody.
    I got one question that is haunting me.
    When a pc requests or sends information at layer 2, frames, what changes as this frame reaches a router in order to reach another pc on the other end of the router?
    Let’s assume that this pc1 is 192.168.28.1/25 and it's mac is 0001.0202.0303, connected to the router on fa0/0 192.168.0.1/30 - mac 0000.0000.0002 and PC2 on the routers fa0/1 192.168.0.2/30 mac - 0000.0000.0003. The pc2 on this end, fa0/1 is 192.168.28.129/25 and its mac is 000.000.1234.

    The frame leaving the pc1 to pc2 contains its own layer 2 address 0001.0202.0303 as being the source and the destination address of pc2 as being 192.168.28.129? Or the routers layer 3 address on fa0/0 192.168.0.1?

    What changes on a frame as it moves along the network? Is it the physical address (MAC) or the logical address (IP)????

    This is buggering me. I have goggled it but nothing close to what I am asking.

    Any help well appreciated everybody.
    Please help.
    Cheers,
     
    Certifications: CCNA
    WIP: 220-701 - A+
  2. Sparky
    Highly Decorated Member Award

    Sparky Zettabyte Poster Moderator

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    Does this help mate?

    http://en.wikipedia.org/wiki/Data_link_layer


    IP address is in layer 3...

    http://www.erg.abdn.ac.uk/users/gorry/course/inet-pages/ip-packet.html
     
    Certifications: MSc MCSE MCSA:M MCSA:S MCITP:EA MCTS(x5) Security+ Network+ A+
    WIP: Exchange 2007\2010
  3. albertc30

    albertc30 Kilobyte Poster

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    Certifications: CCNA
    WIP: 220-701 - A+
  4. Sparky
    Highly Decorated Member Award

    Sparky Zettabyte Poster Moderator

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    Well if the data passes over a NAT device then yeah as the public address is only routable on the internet. When the data is passed back then the NAT device will change the address to the private IP so the correct node (e.g server) on the LAN will recieve the data.
     
    Certifications: MSc MCSE MCSA:M MCSA:S MCITP:EA MCTS(x5) Security+ Network+ A+
    WIP: Exchange 2007\2010
  5. BosonMichael
    Highly Decorated Member Award

    BosonMichael Yottabyte Poster

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    I find it hard to believe that your courseware doesn't contain any information on this topic... it's covered in depth in Chapter 7 of the Cisco Press ICND1 book. You might check it out!
     
    Certifications: CISSP, MCSE+I, MCSE: Security, MCSE: Messaging, MCDST, MCDBA, MCTS, OCP, CCNP, CCDP, CCNA Security, CCNA Voice, CNE, SCSA, Security+, Linux+, Server+, Network+, A+
    WIP: Just about everything!
  6. Mr.Cheeks

    Mr.Cheeks 1st ever Gold Member! Gold Member

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    That's where you went wrong...
    You should of Googled it!
     
  7. danielno8

    danielno8 Gigabyte Poster

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