A technique for hiding a secret message within a larger document or picture in such a way that others cannot discern the presence or contents of the hidden message is __________ .

Which network device allows the Internet to be shared among several devices?

A) Modem B) Network Interface Card (NIC) C) Router D) Wireless access point (WAP)

When extending the range for a 2.4-GHz WLAN, you can use non-overlapping channels for adjacent coverage cells. However, there should be some overlap in coverage between those cells (using non-overlapping channels) to prevent a connection from dropping as a user roams from one coverage cell to another. What percentage of coverage overlap is recommended for these adjacent cells?

a. 5 percent to 10 percent b. 10 percent to 15 percent c. 15 percent to 20 percent d. 20 percent to 25 percent