Which of the following ways can help secure a modem? (Select the two best answers.)
A. Use the callback feature.
B. Mount the modem to the floor.
C. Use telnet.
D. Used strong passwords.
A. and D. Using the callback feature enables you to set the modem to call a specific person back at a preset phone number. Strong passwords and some type of authentication scheme can also help to secure a modem. Modems are generally not bolted to the floor; however, a PBX device might be. Telnet is an insecure application and protocol; it should be substituted with SSH.
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Consider the following relations for a database that keeps track of student enrollment in courses and the books adopted for each course:
STUDENT (SSN, Name, Major, Bdate) COURSE (Course#, Quarter, Grade) ENROLL (SSN, Course#, Quarter, Grade) BOOK_ADOPTION (Course#, Quarter, Book_ISBN) TEXT (Book_ISBN, Book_Title, Publisher, Author) Specify the foreign keys for this schema, stating any assumptions you make.
To refer to a particular location or element in the array, we specify the name of the array and the ________ of the particular element in the array.
a) contents b) size c) position number d) type
Macro instructions are written in ________ Basic for Applications, a programming language that is built into Microsoft Office
Fill in the blank(s) with correct word
Relational expressions are also known as ____.
A. conditions B. boolean expressions C. logical expressions D. if-else expressions