MCQs in Network Layer: Delivery, Forwarding and Routing

MCQs in Network Layer: Delivery, Forwarding and Routing from the book Data Communications and Networking 4th Edition by Behrouz A. Forouzan. Reviewer in Electronics Systems and Technologies (Communications Engineering).

MCQs for Network Layer: Delivery, Forwarding and Routing

This is the MCQs in Network Layer: Delivery, Forwarding and Routing from book the Data Communications and Networking 4th Edition by Behrouz A. Forouzan. If you are looking for a reviewer in Electronics Systems and Technologies (Communications Engineering) this will definitely help you before taking the Board Exam.

Topic Outline

  • DELIVERY
    • Direct Versus Indirect Delivery
  • FORWARDING
    • Forwarding Techniques
    • Forwarding Process
    • Routing Table
  • UNICAST ROUTING PROTOCOLS
    • Optimization
    • Intra- and Interdomain Routing
    • Distance Vector Routing
    • Link State Routing
    • Path Vector Routing
  • MULTICAST ROUTING PROTOCOLS
    • Unicast, Multicast, and Broadcast
    • Applications
    • Multicast Routing
    • Routing Protocols

Begin and Good luck!

Choose the letter of the best answer in each questions.

1. In _______ delivery, the deliverer of the IP packet and the destination are on different networks.

  • A)            a connection-oriented
  • B)            a direct
  • C)            an indirect
  • D)            none of the above

2. The input and output ports of a router perform the ________ layer functions of the router.

  • A)            physical and data link
  • B)            network
  • C)            transport
  • D)            none of the above

3. _________ broadcasts packets, but creates loops in the systems.

  • A)            Forwarding
  • B)            Flooding
  • C)            Backwarding
  • D)            none of the above

4. CBT is a ________ protocol that uses a core as the root of the tree.

  • A)            source-based
  • B)            group-shared
  • C)            a or b
  • D)            none of the above

5. RPF guarantees that each network receives only ____ of the multicast packet.

  • A)            one copy
  • B)            two copies
  • C)            a or b
  • D)            none of the above

6. Routing between autonomous systems is referred to as ____________.

  • A)            interdomain routing
  • B)            intradomain routing
  • C)            both a and b
  • D)            none of the above

7. DVMRP is a ________routing protocol, based on RIP.

  • A)            source-based
  • B)            group-shared
  • C)            both a and b
  • D)            none of the above

8. In _______, the router may forward the received packet through several of its interfaces.

  • A)            unicasting
  • B)            multicasting
  • C)            broadcasting
  • D)            none of the above

9. __________ is an implementation of multicast distance vector routing. It is a source-based routing protocol, based on RIP.

  • A)            MOSPF
  • B)            DVMRP
  • C)            CBT
  • D)           none of the above

10. In multicast routing, each involved router needs to construct a ________ path tree for each group.

  • A)            average
  • B)            longest
  • C)            shortest
  • D)            none of the above

11. In ________, the multicast packet must reach only those networks that have active members for that particular group.

  • A)             RPF
  • B)             RPB
  • C)             RPM
  • D)             none of the above

12. In ________, each node maintains a vector (table) of minimum distances to every node.

  • A)             path vector
  • B)             distance vector
  • C)             link state
  • D)             none of the above

13. A _______ message tells an upstream router to start sending multicast messages for a specific group through a specific router.

  • A)             weed
  • B)             graft
  • C)             prune
  • D)             none of the above

14. RPB guarantees that each destination receives _________ of the packet.

  • A)             one copy
  • B)             no copies
  • C)             multiple copies
  • D)             none of the above

15. Emulation of ________ through ___________ is not efficient and may create long delays.

  • A)             unicasting; multiple unicasting
  • B)             multicasting; multiple unicasting
  • C)             broadcasting; multicasting
  • D)             none of the above

16. MOSPF is a _______ protocol.

  • A)             data-driven
  • B)             command-driven
  • C)             both a and b
  • D)             none of the above

17. RPB creates a shortest path _______ tree from the source to each destination.

  • A)             unicast
  • B)             multicast
  • C)             broadcast
  • D)             none of the above

18. The _______ protocol allows the administrator to assign a cost, called the metric, to each route.

  • A)             OSPF
  • B)             RIP
  • C)             BGP
  • D)             none of the above

19. A one-to-all communication between one source and all hosts on a network is classified as a _______ communication.

  • A)             unicast
  • B)             multicast
  • C)             broadcast
  • D)             none of the above

20. For purposes of routing, the Internet is divided into ___________.

  • A)             wide area networks
  • B)             autonomous networks
  • C)             autonomous systems
  • D)             none of the above

21. The metric used by _______ is the hop count.

  • A)             OSPF
  • B)             RIP
  • C)             BGP
  • D)             none of the above

22. A static table is one _______.

  • A)             with manual entries
  • B)             which is updated automatically
  • C)             either a or b
  • D)             none of the above

23. The idea of address aggregation was designed to alleviate the increase in routing table entries when using ________.

  • A)             classful addressing
  • B)             classless addressing
  • C)             both a and b
  • D)             none of the above

24. In _______ forwarding, the full IP address of a destination is given in the routing table.

  • A)             next-hop
  • B)             network-specific
  • C)             host-specific
  • D)             default

25. The Routing Information Protocol (RIP) is an intradomain routing based on _________ routing.

  • A)             distance vector
  • B)             link state
  • C)             path vector
  • D)             none of the above

26. ____________ is a group of networks and routers under the authority of a single administration.

  • A)             An autonomous system
  • B)             An area
  • C)             both a and b
  • D)             none of the above

27. In the group-shared tree approach, _________ involved in multicasting.

  • A)             only the core router is
  • B)             all routers are
  • C)             only some routers are
  • D)             none of the above

28. In OSPF, a ________ link is a network is connected to only one router.

  • A)             point-to-point
  • B)             transient
  • C)             stub
  • D)             none of the above

29. _______ adds pruning and grafting to _______ to create a multicast shortest path tree that supports dynamic membership changes.

  • A)             RPM; RPB
  • B)             RPB; RPM
  • C)             RPF: RPM
  • D)             none of the above

30. In OSPF, when the link between two routers is broken, the administration may create a _________ link between them using a longer path that probably goes through several routers.

  • A)             point-to-point
  • B)             transient
  • C)             stub
  • D)             none of the above

31. The Open Shortest Path First (OSPF) protocol is an intradomain routing protocol based on _______ routing.

  • A)             distance vector
  • B)             link state
  • C)             path vector
  • D)             none of the above

32. In unicast routing, each router in the domain has a table that defines a ______ path tree to possible destinations.

  • A)             average
  • B)             longest
  • C)             shortest
  • D)             none of the above

33. In _______, a logical tunnel is established by encapsulating the multicast packet inside a unicast packet.

  • A)             UNIBONE
  • B)             MULTBONE
  • C)             MBONE
  • D)             none of the above

34. _______ deals with the issues of creating and maintaining routing tables.

  • A)             Forwarding
  • B)             Routing
  • C)             Directing
  • D)             none of the above

35. To create a neighborhood relationship, a router running BGP sends an ________ message.

  • A)             open
  • B)             update
  • C)             keep alive
  • D)             none of the above

36. The Multicast Open Shortest Path First (MOSPF) protocol is an extension of the OSPF protocol that uses multicast routing to create source-based trees. The protocol is based on _______ routing.

  • A)             distance vector
  • B)             link state
  • C)             path vector
  • D)             none of the above

37. RPF eliminates the ________ in the flooding process.

  • A)             forwarding
  • B)             backwarding
  • C)             flooding
  • D)             none of the above

38. A _______ routing table is updated periodically using one of the dynamic routing protocols.

  • A)             static
  • B)             dynamic
  • C)             hierarchical
  • D)             none of the above

39. A one-to-many communication between one source and a specific group of hosts is classified as a _______ communication.

  • A)             unicast
  • B)             multicast
  • C)             broadcast
  • D)             none of the above

40. A one-to-one communication between one source and one destination is classified as a _______ communication.

  • A)             unicast
  • B)             multicast
  • C)             broadcast
  • D)             none of the above

41. A _______ routing table contains information entered manually.

  • A)             static
  • B)             dynamic
  • C)             hierarchical
  • D)             none of the above

42. PIM-DM is used in a _______ multicast environment, such as a LAN.

  • A)             dense
  • B)             sparse
  • C)             a or b
  • D)             none of the above

43. In distance vector routing, each node periodically shares its routing table with _________ and whenever there is a change.

  • A)             every other node
  • B)             its immediate neighbors
  • C)             one neighbor
  • D)             none of the above

44. Routing inside an autonomous system is referred to as _______________.

  • A)             interdomain routing
  • B)             intradomain routing
  • C)             both a and b
  • D)             none of the above

45. In RPF, a router forwards only the copy that has traveled the _______ path from the source to the router.

  • A)             shortest
  • B)             longest
  • C)             average
  • D)             none of the above

46. In ________ routing, we assume that there is one node (or more) in each autonomous system that acts on behalf of the entire autonomous system.

  • A)             distant vector
  • B)             path vector
  • C)             link state
  • D)             none of the above

47. ___________ is an interdomain routing protocol using path vector routing.

  • A)             BGP
  • B)             RIP
  • C)             OSPF
  • D)             none of the above

48. In OSPF, a ________ link connects two routers without any other host or router in between.

  • A)             point-to-point
  • B)             transient
  • C)             stub
  • D)             none of the above

49. In _______ forwarding, the routing table holds the address of just the next hop instead of complete route information.

  • A)             next-hop
  • B)             network-specific
  • C)             host-specific
  • D)             default

50. In _______ forwarding, the destination address is a network address in the routing table.

  • A)             next-hop
  • B)             network-specific
  • C)             host-specific
  • D)             default

51. Pruning and grafting are strategies used in _______.

  • A)             RPF
  • B)             RPB
  • C)             RPM
  • D)             none of the above

52. The task of moving the packet from the input queue to the output queue in a router is done by _________.

  • A)             input and output ports
  • B)             routing processor
  • C)             switching fabrics
  • D)             none of the above

53. In _______ delivery, both the deliverer of the IP packet and the destination are on the same network.

  • A)             a connectionless
  • B)             a direct
  • C)             an indirect
  • D)             none of the above

54. In _______ forwarding, the mask and destination addresses are both 0.0.0.0 in the routing table.

  • A)             next-hop
  • B)             network-specific
  • C)             host-specific
  • D)             default

55. In the _______ tree approach, each router needs to have one shortest path tree for each group.

  • A)             group-shared
  • B)             source-based
  • C)             a or b
  • D)             none of the above

56. The use of hierarchy in routing tables can ________ the size of the routing tables.

  • A)             reduce
  • B)             increase
  • C)             both a and b
  • D)             none of the above

57. In _______ routing, the least cost route between any two nodes is the route with the minimum distance.

  • A)             path vector
  • B)             distance vector
  • C)             link state
  • D)             none of the above

58. Multicast link state routing uses the _______ tree approach.

  • A)             source-based
  • B)             group-shared
  • C)             a or b
  • D)             none of the above

59. A dynamic table is one _______.

  • A)             with manual entries
  • B)             which is updated automatically
  • C)             either a or b
  • D)             none of the above

60. In ______, the router forwards the received packet through only one of its interfaces.

  • A)             unicasting
  • B)             multicasting
  • C)             broadcasting
  • D)             none of the above

61. In OSPF, a _______ link is a network with several routers attached to it.

  • A)             point-to-point
  • B)             transient
  • C)             stub
  • D)             none of the above

62. The _________ routing uses the Dijkstra algorithm to build a routing table.

  • A)             distance vector
  • B)             link state
  • C)             path vector
  • D)             none of the above

63. An area is _______.

  • A)             part of an AS
  • B)             composed of at least two ASs
  • C)             another term for an AS
  • D)             none of the above

64. The principle of ________ states that the routing table is sorted from the longest mask to the shortest mask.

  • A)             first mask matching
  • B)             shortest mask matching
  • C)             longest mask matching
  • D)             none of the above

65. PIM-SM is used in a _______multicast environment such as a WAN.

  • A)             dense
  • B)             sparse
  • C)             a or b
  • D)             none of the above

66. The routing processor of a router performs the ________ layer functions of the router.

  • A)             physical and data link
  • B)             network
  • C)            transport
  • D)             none of the above

67. A _______ message tells an upstream router to stop sending multicast messages for a specific group through a specific router.

  • A)             weed
  • B)             graft
  • C)             prune
  • D)             none of the above

Check your work.

Complete List of Chapter Quiz in Data Communications and Networking

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credit: Behrouz A. Forouzan© 2014 www.PinoyBIX.org

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