Backbone Networks Testbank Part 2

51. With switched backbones, network capacity is always tied to the physical location of the computers. Answer: False 52. Switched backbones are harder to maintain and upgrade than a BN that is not rackbased. Answer: False 53. Several switches are used to build a VLAN. Answer: True 54. The switches in the VLAN can send packets among themselves in a way that identifies the VLAN to which the frame belongs. Answer: True 55. In some multi-switch VLANs, the Ethernet frame is modified based on the emerging IEEE 802.1q standard. Answer: True 56. In some multi-switch VLANs, a new VLAN packet encapsulates the Ethernet packet. Answer: True 57. VLAN configurations are limited to spanning over no more than two switches. Answer: False MULTIPLE CHOICE The following are possible multiple-choice questions for tests. The question is posed and the answer is provided under the choices. The level of difficulty (easy, medium, and hard) and the page number(s) relevant to the topic is also furnished. 1. Which of the following is not true about backbone networks? a. They may also be called enterprise networks if they connect all networks within an organization. b. They typically connect many networks, including LANs. c. They typically provide connections to other BNs, WANs, MANs, and the Internet. d. They may also be called campus networks if they connect many BNs spanning several buildings as a single location. e. They tend to use lower speed circuits than LANs. Answer: e 2. Which of the following is not a type of hardware device that can be used to interconnect networks? a. b. c. d. e. layer 3 switches routers dumb terminals layer 2 switches all of the above can be used Answer: c 3. Switches: a. b. c. d. e. learn addresses by reading the source and destination addresses. operate at the physical layer only. connect two or more network segments that use different data link protocols. connect two or more network segments that use different network protocols. have become less popular than hubs. Answer: a 4. Routers: a. b. c. d. e. operate at the application layer. operate only at the physical layer. cannot connect two or more networks that use the same type of cable. may also be called TCP/IP gateways. operate only at the data link layer. Answer: d 5. Which of the following is not a way that a router differs from a switch? a. b. c. d. e. Routers can connect two or more networks that use the same data link protocol. Routers only process messages that are specifically addressed to it. Routers operate at the network layer. Routers perform more processing on each message than switches do. Routers can choose the “best” route between networks for forwarding a packet. Answer: a 6. Which of the following is not true about Layer-3 switches? a. b. c. d. e. They switch messages based on their IP address. They can be used in place of routers. They function faster than routers. They have more simultaneously active ports than routers. They can only switch messages based on their data link layer addresses. Answer: e 7. Which of the following is a fundamental backbone network architecture? a. b. c. d. e. Bridged backbone Virtual LAN Hubbed backbone Gatewayed backbone Virtual backbone Answer: b 8. Which of the following is not a technology layer that is considered when designing backbone networks? a. b. c. d. e. access layer distribution layer decentralized layer core layer none of the options Answer: c 9. A subnetted or hierarchical backbone can also be called: a. b. c. d. e. Bridged backbone Virtual LAN Hubbed backbone Collapsed backbone Routed backbone Answer: e 10. _________ move packets along the backbone based on their network layer address. a. b. c. d. e. Bridged backbones Hubbed backbones Multistation access unit backbones Routed backbones NIC backbones Answer: d 11. Routers: a. b. c. d. e. connect different IP networks or subnetworks typically do not require any configuration by the network administrator use data link layer addresses to move packets that leave the subnet typically require only one TCP/IP address do less processing on packets than a layer 2 switch does Answer: a 12. Two primary disadvantages to the ______ BN type are that the routers in the network impose time delays, and routers are typically more expensive and require more management than switches. a. b. c. d. e. bridged backbone virtual LAN hubbed backbone collapsed backbone routed backbone Answer: e 13. A __________ type of BN has a star topology with a switch at its center resulting in all devices on the BN segment being part of the same IP network. a. b. c. d. e. Bridged backbone Virtual LAN Hubbed backbone Switched backbone Routed backbone Answer: d 14. Switched backbone networks: a. b. c. d. e. always use a ring topology are the least common type of BN used in one building use a star topology with one device, usually a switch switch the traffic based on layer 3 addresses require much more management that do routed backbone networks Answer: c 15. Which of the following is not true about switched backbones? a. Network latency (delay) is decreased in comparison to traditional (bridged or routed) backbone networks. b. Each connection into the switch is a separate point-to-point circuit, which supports simultaneous access by the LANs connected to the switch. c. There are many more networking devices in a switched backbone network compared to the number of LAN.s attaching to it. d. The use a star topology e. The backbone essentially exists in the switch; there is no backbone cable. Answer: c 16. Which of the following is true regarding switched backbones? a. They place all network devices for one part of the building physically in the same room, often in a rack of equipment. b. They have an advantage of requiring less cable. c. They make it more difficult to move computers from one LAN to another. d. Network capacity is always tied to the physical location of the computers. e. They are harder to maintain and upgrade than a BN that is not rack-based. Answer: a 17. Associated with a switched backbone, MDF is an acronym for: a. b. c. d. e. multi-station device foundation. main distribution facility. manual data frequency. multiplexer downstream flow. maximum data facility. Answer: b 18. A _____________ type of BN is a new type of LAN/BN architecture made possible by intelligent, high-speed switches that assign computers to LAN segments via software, rather than by hardware. a. b. c. d. e. Bridged backbone Virtual LAN Hubbed backbone Collapsed backbone Routed backbone Answer: b 19. Which of the following is not true about multi-switch VLANs? a. Several switches are used to build a VLAN. b. The switches in the VLAN can send packets among themselves in a way that identifies the VLAN to which the frame belongs. c. In some multi-switch VLANs, the Ethernet frame is modified based on the emerging IEEE 802.1q standard. d. In some multi-switch VLANs, a new VLAN packet encapsulates the Ethernet packet. e. VLAN configurations are limited to spanning over no more than two switches. Answer: e 20. Which of the following would be least effective in improving backbone performance? a. b. c. d. e. upgrading memory for devices in the network changing the demand placed on the network adding new keyboards to the client computers upgrading the circuits between devices improving devices in the network Answer: c 21. Circuit capacity on a backbone network will not be improved by: a. b. c. d. e. going from 100Base-T Ethernet to 10Base-T Ethernet. going from 100Base-T Ethernet to gigabit Ethernet. adding additional circuits alongside heavily used ones. replacing a shared circuit backbone with a switched circuit backbone. providing a faster circuit to the server. Answer: a 22. Device performance on a backbone network will not be improved by: a. using the same protocols in the backbone and the LANs. b. using static routing in low to moderate traffic conditions. c. ensuring that backbone devices have sufficient memory so that packets do not have to be retransmitted by the sender. d. translating packets from one protocol to another as they enter the BN. e. none of the options. Answer: d 23. Network demand will not be reduced by: a. restricting (or moving) applications such as desktop videoconferencing. b. using network devices to ensure that broadcast messages do not go to other networks. c. encouraging the use of applications such as medical imaging. d. sending status information to all computers on all LANs in the backbone network. e. restricting (or moving) applications such as multimedia. Answer: c 24. Which of the following would not be part of an “ideal” backbone design? a. b. c. d. Access layer composed of 10/100 layer 2 Ethernet switches Distribution layer composed of layer 3 Ethernet switches of 100 (or 1000) Base-T Redundant switches Core layer composed of layer 3 Ethernet switches running 10 (or 40) GbE over fiber e. Coax cabling throughout LANs and BN Answer: e 25. The backbone architecture layer that is closest to the users is the a. b. c. d. e. Access layer Distribution layer Core layer Privacy layer Switched layer Answer: a 26. The _______ is the part of the backbone that connects the LANs together. a. b. c. d. e. Access layer Distribution layer Core layer Privacy layer Switched layer Answer: b 27. The _________ is the part of the backbone that connects the different backbones together. a. b. c. d. e. Access layer Distribution layer Core layer Privacy layer Switched layer Answer: c 28. With a switched backbone network, the equipment is usually placed in a ______. a. b. c. d. e. server NIC cabinet basement rack Answer: e 29. Devices in a rack are connected together using ___________. a. b. c. d. e. patch cables string servers modules chassis switches Answer: a 30. Using ______ capabilities, network managers can connect VOIP phones directly into a VLAN switch and configure the switch to reserve sufficient network capacity so that they will always be able to send and receive voice messages. a. backbone b. switched c. routed d. QoS e. access Answer: d 31. Computers can be assigned to a VLAN based on the ________. a. b. c. d. e. IEEE 802.1q standard NIC interface physical port on the switch IEEE 802.3 standard physical location of the computer Answer: c 32. The biggest drawbacks to VLANs are their_________________. a. b. c. d. e. cost and management complexity size and contention contention and cost learning curve and contention speed and size Answer: a 33. VLANs prioritize traffic based on the ______. a. b. c. d. e. IEEE 802.1q standard IEEE 802.11 standard VLAN size multiswitch allocation switch dynamics Answer: a 34. Most backbone devices are store-and-forward devices. One simple way to improve performance is to ensure that they have ________________. a. b. c. d. e. enough ports sufficient memory twisted pair connections large wheels IEEE 802.11 Answer: b 35. As security becomes more important, most routers now have software that enables the network manager to create a(n) _______ that specifies what traffic the router should allow through and what traffic the router should block. a. b. c. d. e. module access control list MDF VLAN ID VLAN tag Answer: b 36. _______ are the most secure type of backbone because they enable ACL and other security measures to be applied at the switch level. a. b. c. d. e. VLANs Switched backbones Routed backbones MDF backbones Ethernet backbones Answer: a