Ch 7 Questions (Final) Flashcards
What is the business value of VPN? Name 2 business objectives of VPN.
Let’s workers access high-speed Internet to work remotely
Allows workers to access corporate network, using encryption and two-factor authentication
Tunneling - packets of data are encrypted and wrapped inside IP packets
What does the term digital mean?
Expressed as series of the digits 0 and 1, typically represented by values of a physical quantity such as voltage or magnetic polarization
Using only two values; polarities or voltages
Magnetic polarization - positive and negative charges
How is something stored in a hard disk, for example the capital letter T? How is a logical sequence of binary digits sent to the compter?
Stored as negative and positive charges, sent through different voltages
When saved it is saved as positive and negative charges.
T=01010011 (-+-+–++) positive and negative charges.
Physically when hitting shift T the computer is physically sent voltage
Ex. 5v 10v 5v 10v 5v 5v 10v 10v
Which is truer to the source? Analog or digital?
Analog
How come digital has taken over, instead of analog?
More convenient
Analog is very easily distorted. It can be scratched, dust, etc.
Digital signal travels as electrical signals
Digital is harder to distort because there is only two values
What is Voice Over IP?
Technology delivers voice information in digital form using packet switching, avoiding the tolls charged by local and long-distance telephone networks
What is the business value of Voice Over IP?
Reduce communication and network management costs by 20-30%
Provides single voice-data infrastructure for both telecommunications and computing services
Lowers long-distance costs
Eliminated monthly fees for private lines
What is VPN?
A secure connection between two points across the Internet to transmit corporate data
Provides a low-cost alternative to a private network
What is a hard drive?
A metal platter that drops a negative or positive charge on the platter
What is analog?
Ex. Music
Sound waves measured as frequencies
Different frequencies over time
Infinite number of points in time and infinite number of frequencies
Convert to digital to put on hard disk, limit frequencies to say two spaces past decimal point
Can store sample but not infinite on hard disk
How are pictures represented on a computer?
By location and color - both numbers
What travels more efficiently? Data or voice phone calls?
Data travels more efficiently because it uses up the entire band width to the lease line
Sending packets through as fast as it can with a phone call, circuits get tied up
