Term
| The signal-to-noise ratio measures the quality of a communications channel. |
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Definition
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| The bit error rate usually increases as the transfer rate decreases. |
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| The most common guided medium has been silicon. |
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| Unguided media cannot transmit or carry infrared light signals. |
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| Impedance makes the electrical signals weaken as they travel along the wire. |
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| Twisted pair cable has been a popular medium in the past, but it's being replaced in most instances by coaxial cables that are less expensive to produce and have even high bandwidths. |
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| Inductance doesn't apply to fiber-optic cables at all. |
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Definition
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| Fiber-optic cables are much more susceptible to attenuation than copper cables. |
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Definition
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Term
| Wireless networking uses the same technology as the radio in your car and the cell phone in your pocket. |
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Definition
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Term
| Without protocols, there would be no Internet. |
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Definition
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| Without protocols, computers would not function. |
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Definition
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Term
| The Data Link layer of the OSI model uses routing protocols to select optimal paths between two end systems. |
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Definition
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Term
| Layers in the OSI model are defined and designed to provide services for the process of communicating between computers. |
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Definition
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Term
| The distinction between LANs and WANs is clear and well defined. |
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Definition
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Term
| The computers attached to a network are often referred to as nodes. |
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Definition
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Term
| There are six basic LAN topologies. |
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Definition
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Term
| Fast Ethernet speeds do not exceed 10 Mbps. |
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Definition
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Term
| Each physical device connected to a network must have a network interface card (NIC). |
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Definition
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| Repeaters alter the content of the data in the signals that they boost. |
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| Gateways can be used to connect networks of different types or to connect mainframe computers to PCs. |
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Definition
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Term
| Shifting the starting point of an audio waveform is known as frequency modulation. |
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Definition
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Term
| You can compress information by replacing repeating patterns with a code. |
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Definition
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Term
| The normal copper wire used in your home is capable of speeds faster than 1.5 Mbps. |
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Definition
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| DSL (digital subscriber line) technologies do not allow the upload speed to differ from the download speed. |
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Definition
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Term
| Cable modems provide for differing upload and download speeds. |
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Definition
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Term
| The PCI system bus consists of ___ wires. |
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Definition
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Term
| ___ measures how much information can be carried in a given period over a wired or wireless communication medium, usually measured in bits per second. |
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Definition
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Term
| The tendency of a signal to become weaker over distance is known as ___. |
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Definition
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Term
| ___ media are physical media such as copper wire or fiber-optic cable. |
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Definition
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Term
| Twisting copper wires nearly eliminates the electromagnetic effect known as ___. |
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Definition
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Term
| Fiber-optic cables use ___ fibers to guide light pulses along a cable. |
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Definition
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Term
| ___ transmissions are capable of transmission rates up to 4 Mbps. |
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Definition
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Term
| A(n) ___ is a set of rules designed to facilitate communication. |
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Definition
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Term
| A(n) ___ diagram shows the protocol interactions between two entities. |
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Definition
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Term
| The OSI conceptual model for the communication process has ___ discrete layers. |
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Definition
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Term
| The Transport layer of the OSI model uses data units called ___. |
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Definition
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Term
| The ___ layer of the OSI model is responsible for formatting data so that it's ready for presentation to an application. |
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Definition
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Term
| Each layer in the OSI model is defined in terms of a(n) ____ and a protocol data unit. |
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Definition
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Term
| A ___ is a small number of computers connected together in close proximity, usually in a building or complex. |
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Definition
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Term
| Network configurations are often referred to as network ___. |
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Definition
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Term
| In a ___ topology, a computers or a network device serves as a central point, or hub, for all messages. |
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Definition
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Term
| A widely used technology that has become an industry standard for LANs is ___. |
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Definition
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Term
| ___ are small, special-purpose devices or computers used to connect two or more networks. |
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Definition
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Term
| A ___ is a device designed to protect an internal network or node from intentional or unintentional damage from an external network. |
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Definition
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Term
| ___ convert binary digits into sounds by modulating or modifying a tone. |
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Definition
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Term
| Normal copper wire is capable of carrying ___ voice channels. |
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Definition
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Term
| A digital transmission link with a capacity of 1.544 Mbps is known as a ___ line. |
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Definition
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Term
| Normal telephone voice-grade lines use ___ -division multiplexing to divide up the bandwidth among the subscribers. |
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Definition
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Term
| Because of attenuation, a DSL subscriber is required to be no more than ___ feet away from the nearest telephone company switching station. |
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Definition
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Term
| Cable modems are capable of speeds up to ___. |
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Definition
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