Ethernet Hardware Address
Ethernet defines 48 bit addressing scheme >Each computer attached to an Ethernet network is assigned a unique 48 bit number known as its Ethernet address,Ethernet hardware address manufactures purchase a blocks of ethernet address and assign them in sequence as they manufactures ethernet interface hardware,Thus no two hardware interface have the same ethernet address.
Properties of Ethernet address
→physical addresses are associated with ethernet interface hardware
→moving the hardware interface to a new machine or replacing a hardware interface that has failed changes the machine physical address
Ethernet frame format
Ethernet should be thought of as a link level connection among machine thus it makes sense to view the data transmitted as a frame
→Ethernet frame are variable length
with no frame smaller than 64 octet or larger than 1518
64<=frame<=1518→frame length
In a packet switching network each frame contain a field that contain addressing of destination
The preamble consist of 64 bits(8 octet) of alternating 0's and 1's to help receiving interfaces synchronize
CRC
4 octet→32bit CRC helps the interface detect transmission errors
Frame type
16bit integer help to identify the type of data being carried in the frame
Ethernet frame is self identifying which means that os can determine the type protocol software module should process the frame
the chief advantages of self identifying is they allow multiple protocol to be intermixed on the same physical network without interference
Q.I.a.Explain the Ethernet addressing scheme.(5 mark)[B. Tech. Degree VII Semester Examination November 2012 CS/IT 703 ADVANCED COMPUTER NETWORKS (2006 Scheme)]
Ethernet defines 48 bit addressing scheme >Each computer attached to an Ethernet network is assigned a unique 48 bit number known as its Ethernet address,Ethernet hardware address manufactures purchase a blocks of ethernet address and assign them in sequence as they manufactures ethernet interface hardware,Thus no two hardware interface have the same ethernet address.
Properties of Ethernet address
→physical addresses are associated with ethernet interface hardware
→moving the hardware interface to a new machine or replacing a hardware interface that has failed changes the machine physical address
Ethernet frame format
Ethernet should be thought of as a link level connection among machine thus it makes sense to view the data transmitted as a frame
→Ethernet frame are variable length
with no frame smaller than 64 octet or larger than 1518
64<=frame<=1518→frame length
In a packet switching network each frame contain a field that contain addressing of destination
The preamble consist of 64 bits(8 octet) of alternating 0's and 1's to help receiving interfaces synchronize
CRC
4 octet→32bit CRC helps the interface detect transmission errors
Frame type
16bit integer help to identify the type of data being carried in the frame
Ethernet frame is self identifying which means that os can determine the type protocol software module should process the frame
the chief advantages of self identifying is they allow multiple protocol to be intermixed on the same physical network without interference
Q.I.a.Explain the Ethernet addressing scheme.(5 mark)[B. Tech. Degree VII Semester Examination November 2012 CS/IT 703 ADVANCED COMPUTER NETWORKS (2006 Scheme)]
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