VPNs create a _____________ to transport information through public communications media.
Fill in the blank(s) with the appropriate word(s).
tunnel
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Each macro within a macro group must have the same name.
Answer the following statement true (T) or false (F)
A(n) ____________________ spreads by sending itself to every address in the address book of an infected computer.
Fill in the blank(s) with the appropriate word(s).
The table Faculty has 60,000 rows, each row occupies 100 bytes, and the database page size is 4 k bytes. Assuming pages in the index and data ?les are 100% occupied, estimate the number of page transfers required for the following SELECT statement in each of the cases listed below.
``` SELECT F.DeptId FROM Facu lty F WHERE F.Id = ’111111111’ ``` a. The table has no index. b. The table has a clustered B+ tree index on Id. Assume a (nonleaf) index entry has 20 characters. c. The table has an unclustered B+ tree index on Id. Assume a (nonleaf) index entry has 20 characters. d. The table has an unclustered B+ tree index on (Id, DeptId). Assume that an index entry now has 25 characters. e. The table has an unclustered B+ tree index on (DeptId, Id). Assume that an index entry now has 25 characters.
A relational database is a collection of ____________________.
Fill in the blank(s) with the appropriate word(s).