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Flashcards

204-1

Thea Usita Inglês 110 flashcards

Flashcards do conjunto (110)

  1. 1These are used to connect remote LANs.Wide-Area Networks (WANs)
  2. 2A WAN may cover a ___, ___ , or ___.city
    country
    global region
  3. 3A WAN is owned by a ___, and a ___ pays a fee to use the provider's WAN network services.service provider
    business/ organization
  4. 4T or F: A WAN cannot operate beyond the geographic score of a LAN.FALSE
  5. 5These are used to interconnect the enterprise LAN to remote LANs in branch sites and telecommuter sites.WANs
  6. 6These are typically owned by the organization and used to connect local computers, peripherals, and other devices.LANs
  7. 7T or F: Without WANs, LANs would be a series of isolated networks.TRUE
  8. 8This is being used as an inexpensive alternative to enterprise WANs.Internet
  9. 9It employs a point-to-point circuit between two endpoints.Point-to-Point
  10. 10This WAN topology typically involve dedicated leased-line connectionsPoint-to-Point
  11. 11This connection is transparent to the customer network, as if there was a direct physical link between two endpoints.Point-to-Point
  12. 12With this topology, a single interface to the hub can be shared by all spoke circuits.Hub-and-Spoke
  13. 13This is also an example of a single-home topology.Hub-and-Spoke
  14. 14T or F: A disadvantage of hub-and-spoke topologies is that all communications has to go through the hub.TRUE
  15. 15With this topology, any site can communicate directly with any other site using virtual circuits.Full Mesh
  16. 16T or F: Only few virtual circuits need to be configured and maintained in a Full Mesh.FALSE
  17. 17This topology provides redundancy.Dual-Homed
  18. 18T or F: Dual-home topologies are inexpensive and easy to implement.FALSE
  19. 19This uses a single LAN to share information between computers, and to share peripherals.Small Office
  20. 20This type of strategy has small- to-medium -sized businesses with functional departments in several floors of a building.Campus Network
  21. 21A network used to provide in-house documents and information to employees.Intranet
  22. 22A network that provides project information to designated customers.Extranet
  23. 23This houses various databases and servers of the company.Data Center
  24. 24T or F: Is is better to use private dedicated lines through a local service provider in nearby branch offices.TRUE
  25. 25T or F: Internet is an attractive WAN connection option when offices are located in other countries.TRUE
  26. 26This strategy encourages teleworking and virtual teams.Distributed Network
  27. 27What WAN services are there in the Layer 2 (Data Link)?HDLC, PPP, Frame Relay, Ethernet WANs, MPLS, VSAT, Broadband
  28. 28What WAN services are there in the Layer 1 (Physical)?Electrical, Mechanical, and Operational Connections
  29. 29Which layers does WAN operations focus on?Physical and Data Link layers
  30. 30WAN access is defined ___, ___, ___.TIA/ EIA
    ISO
    IEEE
  31. 31Which layer protocols describe how to provide electrical, mechanical, operations, and functional connections to the services of a communications service provider.?Layer 1 (Physical)
  32. 32T or F: Most WAN links are hub-and-spoke.FALSE
    point-to-point
  33. 33This refers to the devices and inside wiring located on the enterprise edge connecting to a carrier link.Customer Premises Equipment (CPE)
  34. 34This is also called data circuit-terminating equipment, which consists of devices that put data on the local loop.Data Communications Equipment (DCE)
  35. 35T or F: The subscriber can both own and lease the CPE from the service provider.FALSE
  36. 36T or F: The DCE primarily provides an interface to connect subscribers to a communication link on the WAN cloud.TRUE
  37. 37This refers to the customer devices that pass the data from a customer network or host computer for transmission over the WAN.Data Terminal Equipment (DTE)
  38. 38The DTE connects to the local loop through the ___.DCE
  39. 39A point established in a building or complex to separate customer equipment from service provider equipment.Demarcation Point
  40. 40The place where the responsibility for the connection changes from the user to the service provider.Demarcation Point
  41. 41The actual copper or fiber cable that connects the CPE to the CO of the service provider.Local Loop
  42. 42The local loop is also sometimes called the ___.last-mile
  43. 43It is the local service provider facility of building that connects the CPE to the provider network.Central Office (CO)
  44. 44This consists of the long-haul, all-digital, fiber-optic communication lines, switches, routers, and other equipment inside the WAN provider network.Toll network
  45. 45Considered to be a legacy WAN technology.Dialup modem
  46. 46A voiceband modem converts (i.e., modulates) the ___ produced by a computer into ___ that can be transmitted over the analog lines of the public telephone network.Digital signals
    Voice frequencies
  47. 47This server controls and coordinates dialup model, dial-in and dial-out user communication.Access server
  48. 48An access server may have a mixture of ___ and ___ interfaces and support hundreds of simultaneous users.Analog
    Digital
  49. 49A type of digital model used with high-speed DSL or cable Internet service.Broadband modem
  50. 50T or F: Digital-leased lines do not require a CSU and a DSU.FALSE
  51. 51T or F: A CSU/DSU can be a separate device like a modem or it can be an interface on a router.TRUE
  52. 52The ___ provides termination for the digital signal and ensures connection integrity through error correction and line monitoring.CSU
  53. 53The ___ converts the line frames into frames that the LAN can interpret and vise versa.DSU
  54. 54A multiport internetworking device used in service provider networks.WAN switch
  55. 55Provides internetworking and WAN access interface ports that are used to connect to the service provider network.Router
  56. 56A router or multilayer switch that resides within the middle or backbone of the WAN, rather that at its periphery.Core router/ Multilayer switch
  57. 57T or F: A router or multilayer switch must be able to support multiple telecommunications interfaces of the lowest speed used in the WAN core.FALSE
  58. 58A ___ network is one that establishes a dedicated circuit (or channel) between nodes and terminals before the users may communicate.Circuit-switched
  59. 59What are the two most common types of circuit-switched WAN technologies?Public Switched Telephone Network (PSTN)
    Integrated Services Digital Network (ISDN)
  60. 60T or F: If the circuit carries computer data, the usage of this fixed capacity may not be efficient.TRUE
  61. 61This WAN operation splits traffic data into packets that are outed over a shared network.Packet Switching
  62. 62T or F: Packet-switching network require a circuit to be established, and they allow many pairs of nodes to communicate over the same channel.FALSE
  63. 63T or F: The cost of packet switching is higher than that of circuit-switching.FALSE
  64. 64T or F: Delays (latency) and variability of delay (jitter) are greater in packet-switched networks that in circuit-switched networks.TRUE
  65. 65T or F: The switches in a packet-switched network (PSN) determine the links that packets must be sent over based on the addressing information in each packet.TRUE
  66. 66With this approach, full addressing information must be carried in each packet. An example of this is the Internet.Connectionless systems
  67. 67With this approach, the network predetermines the route for a packet, and each packet only has to carry an identifier.Connection-oriented systems
  68. 68Service providers may offer dedicated point-to-point leased lines, circuit-switched links, and packet-switched links.Private WAN infrastructure
  69. 69Service provider may offer broadband Internet access using digital subscriber line (DSL), cable, and satellite access.Public WAN infrastructure
  70. 70____ connection options are typically used to connect small offices and telecommuting employees to a corporate site over the Internet.Broadband
  71. 71Data travelling between corporate sites over the public WAN infrastructure should be protected using ___.VPNs
  72. 72T or F: Service provider networks are complex.TRUE
  73. 73It is an American-based ANSI standard.Synchronous Optical Networking (SONET)
  74. 74It is a European-based ETSI and ITU standard.Synchronous Digital Hierarchy (SDH)
  75. 75IT is a newer fiber optic media development for long-range communcations.Dense Wavelength Division Multiplexing (DWDM)
  76. 76This enables bidirectional communications over one strand of fiber.DWDM
  77. 77How many channels of data can DWDM multiplex onto a single fiber?80
  78. 78What multiplexed signal speed is the channel capable of carrying?10 Gb/s
  79. 79DWDM supports ___ and ___ standards.SONET
    SDH
  80. 80When permanent dedicated connections are required, a ___link is used to provide a pre-established WAN communications path from the customer premises to the provider network.Point-to-point
  81. 81Point-to-point lines are usually leased from a service provider and are called ___.Leased lines
  82. 82What are the 3 advantages of leased lines?Simplicity
    Quality
    Availability
  83. 83What are the disadvantages of leased lines?Cost
    Limited flexibility
  84. 84The layer 2 protocol is usually ___ or ___.HDLC
    PPP
  85. 85This type of WAN access may be required when no other WAN technology is available and is suitable when intermittent, low-volume data transfers are needed.Dialup
  86. 86Traditional telephony uses a copper cable, called the ___, to connect the telephone handset in the subscriber premises to the CO.Local loop
  87. 87The PSTN limit the rate of the signal to less than ___.56 kb/s
  88. 88___ is a circuit-switching technology that enables the local loop of a PSTN to carry digital signals, resulting in higher capacity switched connections.Integrated Service Digital Networks (ISDN)
  89. 89This type of ISDN is intended for the home and small enterprise.Basic Rate Interface (BRI)
  90. 90This type of ISDN is available for larger installations.Primary Rate Interface (PRI)
  91. 91It is a simple Layer 2 non-broadcast multiaccess (NBMA) WAN technology used to interconnect enterprises LANs.Frame Relay
  92. 92___ is capable of transferring voice, video, and data through private and public networks. It is build on a cell-based architecture rather than on a frame-based architecture.Asynchronous Transfer Mode (ATM)
  93. 93ATM cells are always a fixed length of ___. The ATM cell contains a ___ ATM header followed by __ of ATM payload.53 bytes
    5-byte
    48 bytes
  94. 94___ WAN provides a switched, high-bandwidth Layer 2 network capable of managing data, voice, and video all on the same infrastructure.Ethernet
  95. 95It is a multiprotocol high-performance WAN technology that directs data from one router to the next.Multiprotocol Label Switching (MPLS)
  96. 96___ is a solution that creates a private WAN using satellite communications.Very Small Aperture Terminal (VSAT)
  97. 97The signals must travel approximately ___ to the satellite and back.35,786 km
  98. 98This technology is an always-on connection technology that uses existing twisted-pair telephone lines.DSL
  99. 99___ provide an always-on connection and a simple installation.Cable modems
  100. 100The local cable TV office, which is called the ___ contains the computer system and databases needed to provide Internet access.Cable headend
  101. 101To connect to a ___, a subscriber typically needs a wireless modem, which provides a stronger radio and directional antenna than a conventional wireless adapters.Municipal Wi-Fi
  102. 102This is typically used by rural users where cable and DSL are not available.Satellite Internet
  103. 103It provides high-speed broadband service with wireless access and provides broad coverage like a cellphone network rather than through small Wi-Fi hotspots.WiMAX
  104. 104WiMAX is described in the IEEE standard ___.802.16
  105. 105To access a WiMAX network, subscribers must subscribe to an ISP with a WiMAX tower within ___ of their location.30 miles
  106. 106This refers to a newer and faster technology and is considered to be part of fourth generation (4G) technology.Long-Term Evolution (LTE)
  107. 107A ___ is an encrypted connection between private networks over a public network, such as the Internet.VPN
  108. 108Instead of using a dedicated Layer 2 connection, such as a leased line, a VPN used virtual connections called ___.VPN tunnels
  109. 109___ VPNs connect entire networks to each other.Site-to-site
  110. 110___ VPNs enable individual hosts, such as telecommuters, mobile users, and extranet consumers, to access a company network securely over the Internet.Remote-access

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FlashCards sobre 204-1, criado por Thea Usita em 10-02-2018.
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Thea Usita
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