Because of attenuation, a DSL subscriber is required to be no more than ____ feet away from the nearest telephone company switching station.
B. 6,500
C. 12,500
D. 18,000
Answer : D.
Computer Network
- A Web ____ is a software program that retrieves the page and displays it.
- A Web ____ makes a page available to users of the Web.
- Documents on the Web are known as Web ____.
- The foundation for ____ was laid in 1989 by researchers seeking an information system that would make it easy for their colleagues to locate and share data.
- The physical structure of the Internet uses ____ to send data back and forth.
- The largest WAN in existence is the ____.
- If a network covers several buildings or cities, it is called a ____.
- If computers are close together, the network linking them is called a ____.
- The __ protocol establishes a virtual circuit with the destination computer to transmit packets.
- The acronym HTTP stands for ____.
- When you connect your computer to your ____, you become part of the Internet.
- Your Internet provider maintains a switching center called a ____.
- Cable modems are capable of speeds up to ____.
- Normal telephone voice-grade lines use ____-division multiplexing to divide up the bandwidth among the subscribers.
- A digital transmission link with a capacity of 1.544 Mbps is known as a ____ line.
- Normal copper wire is capable of carrying ____ voice channels.
- ____ convert binary digits into sounds by modulating or modifying a tone.
- A ____ is a device designed to protect an internal network or node from intentional or unintentional damage from an external network.
- ____ are small, special-purpose devices or computers used to connect two or more networks.
- A widely used technology that has become an industry standard for LANs is ____.
- In a ____ topology, a computers or a network device serves as a central point, or hub, for all messages.
- Network configurations are often referred to as network ____.
- A ____ is a small number of computers connected together in close proximity, usually in a building or complex.
- Each layer in the OSI model is defined in terms of a(n) ____ and a protocol data unit.