Q&A Hero

Networking

Q: When was the first 802.11 standard created?a. 1985 b. 1987 c. 1995d. 1997
Q: Radio frequencies are the range of frequencies above _____ kilohertz through which an electromagnetic signal can be radiated into space.a. 2 b. 5 c. 10d. 20
Q: What is the mail unit of measurement for radio frequencies?a. Rads b. Hertz c. Ohmsd. Watts
Q: What are the lowest frequencies on which amateur radio operators can transmit?a. 20.1 to 24.0 MHz b. 30.1 to 34.0 MHz c. 40.1 to 44.0 MHzd. 50.1 to 54.0 MHz
Q: Which organization recognizes amateur radio as a significant avenue for advancing communications through experimentation and invention?a. FDA b. OSI c. EIA/TIAd. FCC
Q: By 2006, how many wireless devices are expected to be installed?a. Over 50 million b. Over 75 million c. Over 90 milliond. Over 100 million
Q: In asynchronous communication, communications occur in discrete units, with the start of a unit signaled by a start bit at the front and a stop bit at the back end. _________________________
Q: Many wireless network users are deploying Bluetooth devices because these devices do not rely on proprietary communications, particularly in the lower (and slower) 902-928 MHz range common to older wireless devices. _________________________
Q: The purpose of a(n) terminal node controller is to convert the computer's digital signal to an analog signal that can be amplified by the transmitter/receiver and broadcast out through an antenna. _________________________
Q: Electronic radiation is propagated through the Earth's atmosphere and through space, with properties that resemble waves and properties that resemble particles. _________________________
Q: The PEAP, developed as an alternative to reduce the complexity of authentication, is identical to EAP-TTLS, but does not require the use of certificates. _________________________
Q: In 802.11 communications, the shared secret is the SSID key used for encryption and decryption, and the key itself is encrypted. _________________________
Q: Up to seven Bluetooth devices can be connected at the same time. _________________________
Q: ESS enables existing access points to be notified when a new access point is attached to a network, and it enables adjacent access points to share configuration information with one another. _________________________
Q: The IBSS topology consists of ad hoc peer-to-peer communications between WNICs on individual computers. _________________________
Q: An alternative to using radio wave communications is the 802.11R standard for microwave transmissions. _________________________
Q: The communication method used by 802.11g is OFDM.
Q: All devices that conform to the 802.11a standard must be able to transmit at 6, 12, 24 and 48 Mbps.
Q: With ARQ, if the station sending a packet does not receive an acknowledgment from the destination station, the sending station automatically retransmits the packet.
Q: Priority-based access is intended for communications that are time-sensitive.
Q: In wireless networking, a directional antenna is often used on an indoor network, in which users are mobile and need to broadcast and receive in all directions.
Q: Wireless communications only involve two main components: a card that functions as a transmitter/receiver (transceiver), and an access point.
Q: The IEEE 802.11 standard is also called the IEEE Standard for Wireless LAN Medium Access and Physical Layer Specifications.
Q: Most wireless radio wave network equipment employs closed spectrum technology for packet transmissions.
Q: Network signals are transmitted over radio waves in a fashion similar to the way your local radio station broadcasts.
Q: WLANA is a consortium of universities researching wireless networking, located at Rutgers University.
Q: The physical side of the network is how the signal is transferred from point to point along the cable.
Q: In Netware 6.x after you use the SECURE CONSOLE command, you cannot disable it without rebooting the server.
Q: NetWare 6.x enables you to configure a screen saver at the console by using the SSAVER command.
Q: In decentralized situations, servers are managed by server administrators from each department or division, so that management of a server is customized to the specific needs of that department or division.
Q: In Red Hat Linux 9.x you configure screen effects, which are similar to a screen saver, and you can associate a password with the screen effects.
Q: What four different network topologies are in use in networks today?
Q: Properly designed wiring closets follow the EIA/TIA-569 standard, which specifies what three wiring closet configurations?
Q: List eight different network devices.
Q: When planning where to locate servers in your organization, what security measures should you consider implementing?
Q: What security concepts should be taught to workstation users when training them about physical security?
Q: What are the three general categories of physical security?
Q: What are two potential problems that can exist with VLANs?
Q: Structured networks enable the network administrator to do what seven tasks?
Q: What are the three elements to following a structured design when designing a network?
Q: Match the following terms to the appropriate definition.a. Access servers f. Multiplexerb. Bandwidth g. Plenumc. Cable plant h. Server farmd. Cipher lock i. Topologye. Device lock j. Wiring closet1/ A keyless lock that is often programmable2/ A grouping of servers placed in the same location3/ The transmission capacity of a communications medium4/ A room used to store telecommunications and networking equipment5/ An enclosed area, such as a false floor or ceiling6/ A locking device that attaches a network device to a stationary object7/ The physical layout of cable and the logical path followed by network packets8/ The total amount of communications cable that makes up a network9/ A switch that divides a communications medium into multiple channels10/ Devices that provide remote communications
Q: A(n) ____________________ is the physical layout of cable and the logical path followed by network packets sent on the cable.
Q: ______________________________ is caused by electrical devices that emit radio waves at the same frequency used by network signal transmissions.
Q: ____________________ should be secured with locks, supplied with conditioned and properly grounded power, and be environmentally controlled to offer a constant temperature range and protection from excessive moisture.
Q: A(n) ____________________ is a device that secures data from being accessed outside a network and prevents data from leaving the network through an inside source.
Q: In a(n) ____________________ server security model, the physical security used for servers may vary widely from server to server and department to department.
Q: In a(n) ____________________ server farm configuration, the servers are in one area in which they are easy to maintain, such as at central chassis switch locations.
Q: ____________________ is a protocol in the TCP/IP suite that enables computers and network equipment to gather standardized data about network activity.
Q: Using ____________________ cable for vertical wiring not only enables you to scale the speed of your backbone for high-speed communications, it also has the advantage that it is not affected by EMI or RFI.
Q: _________________________ refers to installing cable that fans out in a horizontal star fashion from one or more centralized hubs or switches, which are located in telecommunications rooms or wiring closets.
Q: ____________________ is the transmission capacity of a communications medium, which is typically measured in bits per second (for data communications) or in hertz (for data voice and video communications), and is determined by the maximum minus the minimum transmission capacity.
Q: Is a centralized layout like a star with workstations as its points?
Q: When you run SECURE CONSOLE in NetWare, can NLMs be loaded if they are not already in a protected system directory sys:system or C: wserver?
Q: Does physical security further involve the location of computers and network devices in a building, along with the construction quality of that building?
Q: Is a VLANa physical network that consists of subnetworks of workgroups established through intelligent software on switches and routers, and is it independent of the logical network topology?
Q: In Red Hat Linux 9.x, is SNMP typically installed during the initial installation of the operating system on TCP/IP servers?
Q: Does horizontal wiring typically encompass multiple floors in a building, fanning out to various rooms and office areas?
Q: When installing a cable plant, should you use single-mode fiber-optic cable for long runs, such as long distances between buildings?
Q: Is it easy for someone to place unauthorized taps into fiber-optic cable?
Q: Is UTP cable the most frequently used network cable because it is relatively inexpensive and easy to install?
Q: Is twisted-pair cable more resistant to EMI and RFI than thin coax cable?
Q: What does "C" represent in the figure above?a. Aluminum sleeve b. Conductor insulation c. Glass claddingd. Optical fiber
Q: What type of topology is displayed in the figure above?a. Star b. Bus c. Ringd. Bus-star
Q: What type of topology is displayed in the figure above?a. Star b. Bus c. Ringd. Bus-star
Q: What type of fiber-optic cabling should be installed between floors in a proper cable plant?a. Single-mode b. Multimode c. Single-strandd. Multi-strand
Q: What is the biggest disadvantage of shielded twisted-pair cabling? a. It is large in diameter and has limited bending capability b. It is relatively susceptible to EMI and RFI c. It is fragile and requires expertise to install d. It needs to have proper grounding
Q: Which type of cable is the most difficult to tap into?a. Twisted pair b. Thick coax c. Fiber opticd. Thin coax
Q: How are the optical light pulses generated in fiber-optic cabling?a. Laser b. LED c. Photometerd. Both a and be. a, b, and c
Q: Which type of communication media is usually used to connect computers that demand high-speed LAN and WAN access?a. Coax cableb. UTP cable c. Fiber-optic cabled. Wireless technologies
Q: What is the biggest disadvantage of the star topology? a. It is more difficult to expand than a traditional bus network b. It is more difficult to manage than a traditional bus network c. It has a single point of failure d. It is easier to tap into than a traditional bus network
Q: The _____ is the most popular topology.a. bus b. star c. hybridd. ring
Q: What device does each computer connect to in a ring layout?a. Chassis switch b. Hub c. Repeaterd. MAU
Q: What is one of the disadvantages of a ring network? a. It is more difficult to manage than a bus topology b. It is more expensive to implement than a bus topology c. It is not suited for transmitting signals over long distances on a LAN d. It does not handle high-volume network traffic as well as the traditional bus topology
Q: Which organization plays a leading role in developing standards for network cabling and data transmissions?a. Comptia b. ISO c. EIA/TIAd. IEEE
Q: Which type of topology consists of cable running from one computer to the next?a. Star b. Bus c. Ringd. Hybrid
Q: Which EIA/TIA standard specifies various wiring closet configurations?a. 232 b. 442 c. 489d. 569
Q: What type of interference is caused by magnetic force fields that are generated by electric devices such as factory machinery, fans, elevator motors, and air-conditioning units?a. EMS b. EMI c. RFId. EMF
Q: Which type of network device divides a communications medium into multiple channels so that several nodes can communicate at the same time?a. Repeater b. Multiplexer c. Switchd. De-multiplexer
Q: Which type of network device provides immediate battery power to equipment during a power failure or brownout?a. Uninterruptible battery source b. Redundant battery source c. Uninterruptible power suppliesd. Redundant power supplies
Q: Which type of network device links network segments and forwards and filters frames between segments?a. Hub b. Router c. Bridged. Switch
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