1 points Save Answer QUESTION 25 Why does it make sense to have error detection codes at the ink layer in addition to th

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1 Points Save Answer Question 25 Why Does It Make Sense To Have Error Detection Codes At The Ink Layer In Addition To Th 1 (33.05 KiB) Viewed 67 times

1 Points Save Answer Question 25 Why Does It Make Sense To Have Error Detection Codes At The Ink Layer In Addition To Th 2 (19.57 KiB) Viewed 67 times

1 points Save Answer QUESTION 25 Why does it make sense to have error detection codes at the ink layer in addition to the checksums at the transport layer? Link layer error detection codes capture bit errors in the data payload whereas transport layer checksums only cover the TCP/UDP header fields Link layer error detection codes, can themselves have bit errors, and having a second layer of bit error checking can help lessen It does not make sense. In fact, this is a redundancy that should always be removed (other check for bit errors in the link layer or in the transport layer, but no need for both), Link layer bit errors can be corrected faster via a retrawnion across the previous link edge whereas a TCP retransmission would have to be from source host to destination. the impact of this 1 points Save A QUESTION 26 In the 802.11 wifi protocol, what is the purpose of the CTS(X) and ACKIX) signals transmitted by the access point? These are broadcasts that are used to let nearby hosts know about the AP's presente These act as colision avoiding locks by telling all stations when it expects X to transmit and when it is done receiving from X These are signals that are used to tell different hosts to immediately start their backot procedures. These are signals that are broadcasted when the AP detects a collision has begin and when has fnished.

QUESTION 27 1 points Sive A Suppose you own a wireless transmission station and you find that the surrounding noise has increased, which in turn has decreased your offective signal to noise ratio. Further suppose that you are unable to increase the power of your transmission to neutralize the SNR. What else can you do to reduce bit errors? Switch to a more advanced data modulation scheme where you can transmit 16 or even 256 bits at a time instead of 1. There is nothing else you can really do as only increasing power or eliminating the noise will help with the SNR, and therefore, the bit error rate Reduce your data transmission rate. Transmit a signal that destructively interferes with the noise