A server administrator suspects that an unauthorized email relay agent is running on a web server. The web server has a hostname of web1.example.com and an IP address of 199.90.89.51. Which of the following commands should the server administrator execute to verify these suspicions?

A. telnet web1.example.com 25
B. telnet web1.example.com 23
C. telnet 199.90.89.51
D. telnet 199.90.89.51 80


Answer: A. telnet web1.example.com 25

Computer Science & Information Technology

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Using a(n) ____ graphic in a Flash document is best when you are developing an advertisement or banner for a Web site for a business or professional organization.

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Computer Science & Information Technology

Assume a schema for the following set of relations :

Shelves(Sid, Size) with primary key Sid
Items(Iid, Man, Name, Space, Cost, Price) with primary key Iid
Stores(Iid, Sid, Remove Date) with primary key Iid
(a) Give a SELECT statement that returns all rows of Shelves. (b) Give a SELECT statement that returns all rows of Shelves corresponding to shelves that have a size greater than 100. (c) Give a SELECT statement that returns the manufacturer and name in all rows of Items corresponding to items whose retail price is more than twice its cost. (d) Give a SELECT statement that returns the manufacturer and name in all rows of Items corresponding to items stored on the shelf whose Sid has value 12345. (e) We would like the database schema to enforce the restriction that, for any item stored on a shelf, the space occupied by the item not exceed the size of the shelf. Use SQL to do this.

Computer Science & Information Technology

________ are frequently shown in a functional dependency diagram

A) Dependencies B) Normal forms C) Determinants D) Entities

Computer Science & Information Technology

Good techs bring essential software tools to every troubleshooting scenario. Name two types of tasks performed by software in a troubleshooting situation.

What will be an ideal response?

Computer Science & Information Technology