Directory protocols are more scalable than snooping protocols because they send explicit request and invalidate messages to those nodes that have copies of a block, while snooping protocols broadcasts a requests to a nodes. Consider again the directory-based quad-core multiprocessor shown in Figure 2. Show all the messages that are sent in the network for each of the following requests: PO reads address 0 times 120 P3 writes address 0 times 124 38 P2 reads address 0 times 128 P1 writes address 0 times 11C 14 Directory protocols are more scalable than snooping protocols because they send explicit request and invalidate messages to those nodes that have copies of a block, while snooping protocols broadcasts a requests to a nodes. Consider again the directory-based quad-core multiprocessor shown in Figure 2. Show all the messages that are sent in the network for each of the following requests: PO reads address 0 times 120 P3 writes address 0 times 124 38 P2 reads address 0 times 128 P1 writes address 0 times 11C 14