Describe the two situations in which a routing table would not have default routes.
What will be an ideal response?
One situation in which a router would not have a default route in its routing table is in a private network, not on the Internet, in which every router knows every other router. Another is in the Tier One backbone where routers make the main connections of the Internet.
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In Section 16.3.2 we pointed out that in a multidatabase system, data could not be communicated directly from one database site to another and that even indirect communication was difficult since a query site cannot send data to a database site. However, the following “end run” might be considered for computing a semi-join. The query site, A, executes a SELECT statement at the first database site, B, which returns the projection, P, used in computing the semi-join. Site A then uses the projection to dynamically construct another SELECT statement whose result set is the semi-join. Using Example 16.3.1 on page 699 of Section 16.3.1 involving tables Student and Transcript, give the two queries. Under what circumstances could such an approach be considered?
What will be an ideal response?
Director files that are locked for distribution have the .dir file extension.
Answer the following statement true (T) or false (F)
Which of the following is not a valid =IF statement?
A) =IF(A5>19,b7,b9 ) B) =IF(A5>19,"Greater","Not Greater") C) =IF(A5>19,Greater,Not Greater) D) =IF(A5>19,1,9)
An expression such as str.length(); is an example of a(n) ____.
A. system call B. object call C. class D. method call