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- Lost as well as delayed ACKs
- Bidirectional transmission both side needs both sending and receiving windows
Note: In selective repeat ARQ the size of the sender and receiver window must be at most one -half of 2m.
802.11 DSSS a) Direct sequence spread spectrum in a 2.4 GHz band b) Each bit is replaced by a sequence of bits called a chip code, implemented at the physical layer c) Se
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