The Transport layer of the OSI model uses data units called _____. 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
attenuation
The tendency of a signal to become weaker over distance is known as _____. 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
glass
Fiber-optic cables use _____ fibers to guide light pulses along a cable. 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
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
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
guided
_____ media are physical media such as copper wire or fiber-optic cable. 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
timing
A(n) _____ diagram shows the protocol interactions between two entities. 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
satellite
Which of the following WAN technologies use the same unguided media as television? 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
98
The PCI system bus consists of _____ wires. 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
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
seven
The OSI conceptual model for the communication process has _____ discrete layers. 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
24
The normal copper wire is capable of carrying _____ voice channels. a. 4 c. 24 b. 16 d. 48