20 terms
chapter 6
datagrams
The Transport layer of the OSI model uses data units called _____.
a. words c. bitgrams
b. datagrams d. bytegrams
a. words c. bitgrams
b. datagrams d. bytegrams
Infrared
_____ pulses allow transmission rates up to 4 Mbps.
a. Microwave c. X-ray
b. Infrared d. Ultraviolet
a. Microwave c. X-ray
b. Infrared d. Ultraviolet
attenuation
The tendency of a signal to become weaker over distance is known as _____.
a. amplification c. attenuation
b. alienation d. amelioration
a. amplification c. attenuation
b. alienation d. amelioration
Presentation
The _____ layer of the OSI model is responsible for translation, formatting, and syntax selection.
a. Presentation c. Application
b. Session d. Data Link
a. Presentation c. Application
b. Session d. Data Link
glass
Fiber-optic cables use _____ fibers to guide light pulses along a cable.
a. ceramic c. plastic
b. glass d. tungsten
a. ceramic c. plastic
b. glass d. tungsten
42 Mbps
Cable is theoretically capable of speeds up to _____.
a. 4.2 Mbps c. 420 Mbps
b. 42 Mbps d. 42 Gbps
a. 4.2 Mbps c. 420 Mbps
b. 42 Mbps d. 42 Gbps
routers
_____ direct network traffic based on the logical (IP) addresses assigned at the third layer of the OSI stack.
a. Bridges c. Hubs
b. Routers d. Gateways
a. Bridges c. Hubs
b. Routers d. Gateways
firewall
A _____ is a device designed to protect an internal network or node from intentional or unintentional damage from an external network.
a. gate c. firewall
b. barricade d. fence
a. gate c. firewall
b. barricade d. fence
guided
_____ media are physical media such as copper wire or fiber-optic cable.
a. Directed c. Undirected
b. Guided d. Oriented
a. Directed c. Undirected
b. Guided d. Oriented
star
In a _____ topology, one of the computers or a network device serves as a hub for all messages.
a. grid c. bus
b. star d. ring
a. grid c. bus
b. star d. ring
timing
A(n) _____ diagram shows the protocol interactions between two entities.
a. flow c. timing
b. assignment d. hierarchy
a. flow c. timing
b. assignment d. hierarchy
inductance
Twisting copper wires nearly eliminates the electromagnetic effect known as _____.
a. inductance c. resonance
b. resistance d. impedance
a. inductance c. resonance
b. resistance d. impedance
satellite
Which of the following WAN technologies use the same unguided media as television?
a. DSL c. cable
b. dial-up d. satellite
a. DSL c. cable
b. dial-up d. satellite
protocol
A(n) _____ is a set of rules designed to facilitate communication.
a. procedure c. code
b. accord d. protocol
a. procedure c. code
b. accord d. protocol
98
The PCI system bus consists of _____ wires.
a. 10 c. 98
b. 20 d. 198
a. 10 c. 98
b. 20 d. 198
Bandwidth
_____ measures the speed a transmission medium is able to handle in bits per second.
a. Bandwidth c. Bit capacity
b. Byte capacity d. Broadwidth
a. Bandwidth c. Bit capacity
b. Byte capacity d. Broadwidth
frequency
Normal telephone voice-grade lines use what is called _____-division multiplexing to divide up the bandwidth among the subscribers.
a. phase c. wave
b. frequency d. amplitude
a. phase c. wave
b. frequency d. amplitude
seven
The OSI conceptual model for the communication process has _____ discrete layers.
a. four c. seven
b. five d. nine
a. four c. seven
b. five d. nine
LAN
A _____ is a relatively small number of computers connected together in close proximity, usually within a building or complex.
a. LAN c. DAN
b. WAN d. MAN
a. LAN c. DAN
b. WAN d. MAN
24
The normal copper wire is capable of carrying _____ voice channels.
a. 4 c. 24
b. 16 d. 48
a. 4 c. 24
b. 16 d. 48