1. Khoảng cách từ A đến B: 100km, Tốc độ đường truyền 360.000km/h, Trung bình mỗi gói tin có kích thước 2MB, Băng thông của đường truyền: 100Mbps, Mỗi gói tin cần 0.01s để xử lý, Cho biết: a)Thời gian để gởi 1 gói tin. Giả sử, tại thời điểm đang xét, hàng đợi của A là rỗng
b)Tại thời điểm t = 0.1s, bit đầu tiên của gói tin đang ở vị trí nào?

Consider a direct-mapped cache with 216 words in main memory. the cache has 16 blocks of 8 words each. it is a word-addressable computer (rather than a byte-addressable computer which we normally discuss). (a) how many blocks of main memory are there? (b) what is the format of a memory address as seen by the cache, that is, what are the sizes of the tag, cache block, and block offset fields (if they apply)? (c) to which cache block will the memory reference db6316 map?

In he example code, what does the title attribute create? a tool tip an element a source a markup

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?