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A closely related question is who will receive credit for forwarding a message. Ideally, any node who has ever tried to forward a message should be compensated because forwarding a message will incur a cost to the node, no matter successful or not. However, a forwarded message may be corrupted on the link, and there is no way to verify that the forwarding action does occur. Although some local wireless networks such as IEEE 802.11 do provide link layer acknowledgments, such acknowledgment schemes are not universal and we refrain from changing basic network functions. Given this decision, the credit that a node receives will depend on whether or not its forwarding. | Chest Radiography Interpretation Pulmonary TB Lisa Chen M.D. Assistant Clinical Professor Pulmonary and Critical Care Division Department of Medicine San Francisco General Hospital Michael Gotway MD Associate Clinical Professor Radiology University of California San Francisco Primary TB Lung Parenchyma Distribution Slight upper lobe predominance but any lobe can be involved Air-space consolidation Cavitation is uncommon 10 Miliary .