About Me

Age:25 --- B.E.(Computer Science), Android/Java Developer, CCNA, CCNA SECURITY (IINS), CCNP (R&S), 4011 Recognized(NSA & CNSS)U.S.A. , MCSA, MCTS, REDHAT CERTIFIED NETWORK SECURITY ADMINISTRATOR(RH253), AFCEH.

Tuesday, April 26, 2011

## 3 MODES OF FRAME FORWARDING:

#############################################################
#############################################################





## Cut Through:

i) Just checks for the Destination Address in the header, and forwards it.
ii) When an error occurs while transmission of the frame the destination asks the sender to resend the frame, which results in Overhead.

## Store & Forward:

i) Default Forwarding Methods for Switches.
ii) Does a complete FCS (Frame Check Sequence) before forwarding.
iii) Provides QOS (Quality Of Service).
iv) Latency is introduced due to its complete checking of frame for errors, but now with the modern switches this is NO MORE A PROBLEM.

## Fragment Free

i) Checks the first 64 bytes of the frame, this is the area where the errors occur mostly.
ii) Frames < 64 bytes      = Runts
                >1500 <1518 = Baby Giant Frames
                >1518            = Giant Frames





#############################################################
#############################################################


No comments:

Post a Comment