Pages

network cisco ccna gns3 certification arteq

network cisco ccna gns3 certification arteq
a network runs through it

Search insearchofthecert

Showing posts with label frame. Show all posts
Showing posts with label frame. Show all posts

Saturday, March 17, 2012

packet traversing, mac changing...

the source ip will be that of the pc sending... the destination ip will be that of the destination host receiving... the source mac will be that of the router... the last router in the chain will be the source mac, and the destination mac will be that of the receiving host... the important thing to remember is that the ip of the sender and receiver never changes...  the source mac will be the last router forwarding to the destination hosts mac...

now, what was the question originally asked above...  leave comments...

Sunday, March 11, 2012

frame


frame=48 bits or 6 bytes

most significant  byte                                   least significant byte
6th byte   5th byte  4th byte  | 3rd byte   2nd byte   1st byte
1st octet
oui first 3                                    vendor assigned second 3 bytes

the left most bit, however is the least significant bit in the byte, and the rightmost bit in the first byte is the most significant bit... if the leftmost bit of the most significant byte is 0, the address is unicast... if it is 1, it is multicast... this wiki is a must read... http://en.wikipedia.org/wiki/MAC_address

thank the IEEE...