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Single-Area OSPF 1

Thea Usita Inglés 101 fichas

Fichas del conjunto (101)

  1. 1It is a link-state routing protocol that was developed as a replacement for the distance vector routing protocol, RIP.Open Shortest Path First (OSPF)
  2. 2It is RIP's metric for determining the best route quickly.hop count
  3. 3T or F: Using hop count does not scale well in larger networks with multiple paths of varying speeds.TRUE
  4. 4T or F: An advantage of OSPF is having faster convergence and scales to much larger network implementations.TRUE
  5. 5OSPF is a _____ routing protocol that uses the concept of areas for ______.classless
    scalability
  6. 6What are the characteristics of OSPF?Classless
    Efficient
    Fast Convergence
    Scalable
    Secure
  7. 7OSPF v3 for IPv6 currently published in _____.RFC 5340
  8. 8Supports VLSM and CIDR.Classless
  9. 9Routing changes trigger routing updates. It uses the SPF algorithm to choose the best path.Efficient
  10. 10T or F: OSPF has periodic updates.FALSE
  11. 11It is the algorithm used by OSPF to choose its best path.Djistra's SPF Algorithm
  12. 12It quickly propagates network changes.Fast Convergence
  13. 13It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.Scalable
  14. 14Routers can be grouped into _____ to support a _____.Areas
    Hierarchical System
  15. 15It supports Message Digest 5 (MD5) authentication. When enabled, OSPF routers only accept encrypted routing updates from peers with the same pre-shared password.Secure
  16. 16Authentication supported by OSPF.Message Digest 5 (MD 5)
  17. 17T or F: With Message Digest 5, routers can also accept routing updates that are not encrypted.FALSE
  18. 18What is the administrative distance for OSPF?110
  19. 19What are the components of OSPF?Data Structures
    Routing Protocol Messages
    Algorithm
  20. 20OSPF's data structures consists of ____, ____, and ____.Adjacency database
    Link-state database (LSDB)
    Forwarding database
  21. 21Creates the neighbor table.Adjacency database
  22. 22Creates the topology table.Link-state database (LDSB)
  23. 23Creates the routing table.Forwarding database
  24. 24These are [the Routing Protocol Messages] used to discover neighboring routers and also to exchange routing information to maintain accurate information about the network.Hello packet
    Database description packet
    Link-state request packet
    Link-state update packet
    Link-state acknowledgement packet
  25. 25The SPF algorithm is based on the _____ to reach a destination.Cost
  26. 26The SPF algorithm creates an ____.SPF tree
  27. 27OSPF places the best routes into the ___, which is used to make the ____.Forwarding database
    Routing table
  28. 28It is a list of all neighbor routers to which a router has established bidirectional communication.Adjacency database
    Neighbor Table
  29. 29T or F: The Neighbor Table is unique for each router.TRUE
  30. 30Command to view the neighbor table.show ip ospf neighbor
  31. 31Lists information about all other routers in the network.Topology Table
  32. 32It represents the network topology.Link-state Database (LDSB)
  33. 33T or F: All routers within an area have different Link-state Database (LDSB).FALSE
  34. 34Command to view the topology table.show ip ospf database
  35. 35List of routes generated when an algorithm is run on the link-state database.Routing table
  36. 36T or F: Each router's routing table is unique.TRUE
  37. 37Command to view the routing table.show ip route
  38. 38Area 0 is called the ____.Backbone area
  39. 39Interconnecting routers are called ____.Area Border Routers (ABRs)
  40. 40T or F: Single-Area OSPF is useful in smaller networks with few routers.TRUE
  41. 41OSPF messages are transmitted over a/an ____.Ethernet link
  42. 42OSPF messages contain the following:Data Link Frame Header
    IP Packet Header
    OSPF Packet Header
    OSPF Packet Type
  43. 43OSPF uses ____ to establish and maintain neighbor adjacencies and exchange routing updates.Link-state Packets (LSPs)
  44. 44Used to establish and maintain adjacency with other OSPF routers.Hello Packet
  45. 45Contains the abbreviated list of the sending router's LDSB.Database Description (DBD) packet
  46. 46Used by the receiving routers to request more information about an entry in the DBD.Link-State Request (LSR) packet
  47. 47Used to reply to LSRs and to announce new information.Link-State Update (LSU) packet
  48. 48This is sent to confirm receipt of the LSU.Link-State Acknowledgment (LSAck) packet
  49. 49T or F: the LSAck data field is empty.TRUE.
  50. 50Used to discover OSPF neighbors and establish neighbor adjacencies.Hello Packet
  51. 51Hello packets elect the ____ and ____ on ____ networks like Ethernet and Frame Relay.Designated Router
    Backup Designated Router
    Multiaccess
  52. 52T or F: Point-to-point links require DR or BDR.FALSE
  53. 53It is a 32-bit value expressed in dotted decimal notation (an IPv4 address) used to uniquely identifying the originating router.Router ID
  54. 54Subnet mask associated with the sending interface.Network Mask
  55. 55Area from which the packet originated.Area ID
  56. 56Specifies the frequency, in seconds, at which a router sends Hello packets.Hello Intval
  57. 57The default Hello interval on multiaccess and point-to-point networks is ____.10 seconds
  58. 58It is used in a DR/ BDR election.Router Priority
  59. 59What is the default priority for all OSPF routers?1
  60. 60T or F: The lower the value, the more likely the router becomes the DR on the link.FALSE
  61. 61It is the time in seconds that a router awaits to hear from a neighbor before declaring the neighboring router out of service.Dead Interval
  62. 62What is the default Dead Interval?Four times the Hello Interval
  63. 63What is the default Hello interval on nonbroadcast multiaccess [NBMA] networks; Frame Relay.30 seconds
  64. 64T or F: If the Dead interval expires before the routers receive a Hello packet, OSPF removes that neighbor from its LSDB.TRUE
  65. 65T or F: The router floods the LSDB with information about the down neighbor out all OSPF-enabled interfaces.TRUE
  66. 66What is the default Dead interval for multiaccess and point-to-point networks?40 seconds
  67. 67What is the default Dead interval for NBMA networks?120 seconds
  68. 68State where no Hello packets are received. Router sends Hello packets.Down State
  69. 69State where Hello packets are received from the neighbor.Init State
  70. 70State where electing a DR and BDR happen on Ethernet links.Two-Way State
  71. 71State where negotiation of master/ slave relationship and dbd packet sequence number happen.ExStart State
  72. 72State where routers exchange DBD packets.Exchange State
  73. 73State where LSRs and LSUs are used to gain additional router information. Routers are processed using the SPF algorithm.Loading State
  74. 74The ____ initiates the DBD packet exchange.master
  75. 75State where routers have converged.Full State
  76. 76T or F: More routers = more adjacenciesTRUE
  77. 77OSPFv2 is enabled using which commandin the global configuration mode?router ospf [process-id]
  78. 78The process-id value is ranged between?1 and 65,535
  79. 79Recommended method (command) to assign a router ID.router-id rid
  80. 80T or F: If the router ID is not explicitly configured, the router chooses the highest IPv4 address of any of configured loopback interfaces.TRUE
  81. 81T or F: If no loopback interfaces are configured, then the router chooses the highest inactive IPv4 address of any of its physical interfaces.FALSE
  82. 82A router ID can also be assigned using a _____.Loopback interface
  83. 83T or F: A 32-bit host route gets advertised as a route to other OSPF routers.FALSE
  84. 84The basic command syntax for enabling OSPF on interfaces is?network network-address wildcard-mask area area-id
  85. 85OSPF metric is ___.Cost
  86. 86T or F: Higher bandwidth = Lower costTRUE
  87. 87T or F: The cost of an interface is inversely proportional to the bandwidth of the interface.TRUE
  88. 88What is the default reference bandwidth?100,000,000
  89. 89OSPF cost formula is:Cost = reference bandwidth / interface bandwidth
  90. 90T or F: When adjusting the reference bandwidth, the command must be configured on every router in the OSPF domain.TRUE
  91. 91T or F: The bandwidth must be adjusted at each end of the serial links.TRUE
  92. 92This command is a quick way to verify vital OSPF configuration information.show ip protocols
  93. 93This command is used to verify OSPF Process Information.show ip ospf
  94. 94It is the OSPFv2 equivalent for exchanging IPv6 prefixes.OSPFv3
  95. 95What OSPFv3 feature supports both IPv4 and IPv6?OSPFv3 Address Families
  96. 96T or F: IPv6 and IPv4 routing protocols are basically the same and run dependently with each other.FALSE
  97. 97T or F: OSPFv2 and OSPFv3 each have separate adjacency tables, OSPF topology tables, and IP routing tables.TRUE
  98. 98Source/ Destination address for OSPFv3.IPv6 link-local address
  99. 99Authentication used for OSPFv3.IPv6 authentication
  100. 100T or F: IPv6 unicast forwarding is enabled by default.FALSE
  101. 101____ are automatically created when an IPv6 global unicast address is assigned to the interface.Link-local Address

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Fichas sobre Single-Area OSPF 1, creado por Thea Usita el 16/11/2017.
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Thea Usita
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