Re: I am having a mental block [7:7609]

2001-06-07 Thread Bob Edmonds 

At least you're not hearing voices


I'm sooo scared...



 wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
 I keep on seeing these questions in books and practice test that ask me
If
 host A sends a frame to host B what is the source MAC address? What is the
 designation MAC address?

 host A ---repeater-host B (I don't think anything will happen
to
 the frame's MAC address)

 host A ---bridgehost B (I don't think anything will happen
to
 the frame's MAC address)

 host A ---routerhost B (MAC address changes. What is the
 source MAC? What is the destination MAC?)

 host A -Ethernet-router SR/TLB-token ring---host B (MAC
 address changes. What is the source MAC? What is the destination MAC?)

 I am having a mental block




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Re: I am having a mental block [7:7609]

2001-06-07 Thread No Data 

host A -- router -- host B

Assuming the router is not acting as a bridge, etc. 
When the packet goes from A to the router its
destination MAC will be that of the router interface
it can talk to (it will ARP it's gateway's address). 
When the packet goes from the router to host B the
source MAC will be that of the router's interface on
that network.

Not sure on the last one.

Ben, CCNP

--- [EMAIL PROTECTED]  wrote:
 I keep on seeing these questions in books and
 practice test that ask me If
 host A sends a frame to host B what is the source
 MAC address? What is the
 designation MAC address?
 
 host A ---repeater-host B (I don't think
 anything will happen to
 the frame's MAC address)
 
 host A ---bridgehost B (I don't
 think anything will happen to
 the frame's MAC address)
 
 host A ---routerhost B (MAC address
 changes. What is the
 source MAC? What is the destination MAC?)
 
 host A -Ethernet-router SR/TLB-token
 ring---host B (MAC
 address changes. What is the source MAC? What is the
 destination MAC?)
 
 I am having a mental block
[EMAIL PROTECTED]


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RE: I am having a mental block [7:7609]

2001-06-07 Thread McClendon Susan Contr AEDC/ACS 

 --- [EMAIL PROTECTED]  wrote:
  
  host A -Ethernet-router SR/TLB-token
  ring---host B (MAC
  address changes. What is the source MAC? What is the
  destination MAC?)

Bit swapping from canonical Ethernet address to noncanonical Token ring
address should be easy to do by the time you take your written CCIE.
Do each step while learning, then later economize as you wish..

Example MAC 0020.A030.0001

step 1: write it in binary
    0010    1010    0011         0001

step 2: write it again in binary but swap bytes 1 with 2, 3 with 4, etc.
     0010    1010    0011       0001   

step 3: reverse the bits in each byte
     0100    0101    1100       1000 

step 4: write it in hex for the answer...
0004.050C.0080

good luck!
susan




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