In the OSI model, at which layers do WANs operate at?（）

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• At which layers of the OSI model do WANs operate? (Choose two.)（）

  A . application layer B . session layer C . transport layer D . network layer E . datalink layer F . physical layer

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• At which layers of the OSI model do WANs operate?（）

  A . application layer B . session layer C . transport layer D . network layer E . datalink layer F . physical layer

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• Data transfer is slow between the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintained. To fix this issue, at which layer should the troubleshooting process begin?（）

  A . presentation B . session C . transport D . network E . physical

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• At which layers of the OSI model do WANs operate (Choose two.)（）。

  A . application layer B . session layer C . transport layer D . network layer E . datalink layer F . physical layer

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• A computer is connected to the network through a NIC， which has a unique assignment that is called the Ethernet MAC address. Which layer of the OSI model does the MAC address use to communicate with the network？（）

  A .  network B .  application C .  session D .  data link

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• At which layer of the OSI model does the Spanning Tree Protocol （STP） operate at？（）

  A . Layer 5 B . Layer 4 C . Layer 3 D . Layer 2 E . Layer 1

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• You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operation?（）

  A . Application B . Presentation C . Session D . Transport E . Internet F . Data Link G . Physical

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• Which three of the following OSI model layers also belong to the TCP/IP model?（）

  A . The application layer B . The session layer C . The data link layer D . The transport layer E . The network interface layer F . The physical layer

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• At Layer 2 of the OSI model, which component connects a host to the network media?（）

  A . Hub B . Switch C . Bridge D . NIC E . Transceiver

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• In the 7-layer OSI model, which layer switching will take place?（）

  A . Layer one B . Layer two C . Layer three D . Layer four

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• Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication? （）

  A . transport B . network C . presentation D . session E . applicatio

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• The TCP/IP network model differs from the more popular OSI model. Which of the layers below belong to the TCP/IP model?（）

  A . application layer B . session layer C . transport layer D . internet layer E . network layer F . data link layer G . physical layer

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• Which of the following layers of the TCP/IP model most closely corresponds to the network layer of the OSI model?（）

  A . Application B . Internet C . Transport D . Network E . Data Link

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• Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data?（）

  A . Application B . Presentation C . Session D . Transport E . Network F . Data-Link

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• Which of the following are associated with the application layer of the OSI model？（two.）（）

  A . ping B . Telnet C . FTP D . TCP E . IP

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• In the communications industry, what are the features and benefits of using the layered OSI model?（）

  A . It encourages industry standardization by defining what functions occur at each layer of the model. B . It necessitates changes in functionality in one layer to other layers. C . It enables equipment efficiency from different vendors to use the same electronic components. D . It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting. E . It supports the evolution of multiple competing standards, and thus enhances business equipment manufacturing opportunities.

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• What are five of the seven layers that are found in the OSI model?（）

  A . session B . physical C . protocol D . gateway E . data link F . transport G . applicatio

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• Which of the following are associated with the application layer of the OSI model (Choose two.)（）。

  A . ping B . Telnet C . FTP D . TCP E . IP

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• Which statement describes the distributed call control model in VoIP networks？（）

  A . The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardown B . The gateway voice-capable device has a local call routing table configured through a routing protocol. C . The gateway voice-capable device relies on a call agent to support call control. D . The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.

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• At which layer of the OSI model is RSTP used to prevent loops？（）

  A . data link B . network C . physical D . transport

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• In the OSI model, at which layers do WANs operate at？（）

  A．Applicationlayer B．Presentationlayer C．Sessionlayer D．Transportlayer E．Networklayer F．DatalinklayerG.Physicallayer

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