In the Outline/Slides pane, the thumbnail of a hidden slide is ________
Fill in the blank(s) with correct word
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Answer the following statements true (T) or false (F)
1. A firewall may be designed to operate as a filter at the level of IP packets or may operate at a higher protocol layer. ? ?? 2. The packet filter is typically set up as a list of rules based on matches to fields in the IP or TCP header. ?? 3. ?The direction control determines the types of Internet services that can be accessed, inbound or outbound. ? 4. The firewall cannot fully protect against internal threats. ?? 5. ??A firewall may not act as a packet filter. ???
In XML Schema, any element or attribute with global scope must be entered asa(n) _______ name.
Fill in the blank(s) with the appropriate word(s).
A file has r=20,000 STUDENT records of fixed-length. Each record has the following fields: NAME (30 bytes), SSN (9 bytes), ADDRESS (40 bytes), PHONE (9 bytes), BIRTHDATE (8 bytes), SEX (1 byte), MAJORDEPTCODE (4 bytes), MINORDEPTCODE (4 bytes), CLASSCODE (4 bytes, integer), and DEGREEPROGRAM (3 bytes). An additional byte is used as a deletion marker. The file is stored on the disk whose parameters are given in Exercise 17.27.
(a) Calculate the record size R in bytes. (b) Calculate the blocking factor bfr and the number of file blocks b assuming an unspanned organization. (c) Calculate the average time it takes to find a record by doing a linear search on the file if (i) the file blocks are stored contiguously and double buffering is used, and (ii) the file blocks are not stored contiguously. (d) Assume the file is ordered by SSN; calculate the time it takes to search for a record given its SSN value by doing a binary search.
Which of the following is NOT an operating system used by today's computers and mobile devices?
A. Mac OS B. Windows C. DOS D. Android