OSI Model Layers N10-009 Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   What is the process of adding headers to data as it moves down the OSI layers called?

   • AEncapsulation
   • BSegmentation
   • CDecapsulation
   • DMultiplexing
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2. 27expert · medium

   A network administrator is troubleshooting a routing issue where packets from a client are not reaching a server on a different subnet. The administrator has verified that the client has a valid IP address and default gateway, and that the server is reachable from other hosts. The administrator runs a traceroute and finds that packets stop at the first router. Which OSI layer should the administrator investigate?

   • ATransport layer, because the router may be dropping packets due to a firewall rule.
   • BNetwork layer, because the router may not have a route to the destination subnet.
   • CPhysical layer, because the link between the client and the router may be down.
   • DData Link layer, because the router may not have the correct MAC address for the next hop.
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4. 28foundation · easy

   What is the main function of the Network layer?

   • AEstablishing, managing, and terminating sessions
   • BProviding logical addressing and routing between networks
   • CConverting data formats for application compatibility
   • DEnsuring reliable data transfer with flow control
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5. 29application · medium

   A user reports that a large file transfer to a remote server consistently fails after several minutes, while smaller transfers succeed. The network team has verified that the link is stable and that there are no errors at the Physical or Data Link layers. The remote server is reachable via ping. Which OSI layer should the technician investigate next?

   • ANetwork layer, because the technician should verify that the routing path is stable for large packets.
   • BSession layer, because the technician should verify that the file transfer session is being maintained.
   • CPresentation layer, because the technician should check whether the file is being properly encoded for transmission.
   • DTransport layer, because the technician should check for TCP window size, segmentation, or timeout issues.
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6. 30expert · medium

   A network engineer is troubleshooting a performance issue with a database application that communicates with clients over a WAN link. The application uses TCP and is experiencing high latency and packet loss. The engineer suspects that the TCP window size is too small, causing the sender to wait for acknowledgments before sending more data. Which OSI layer is the engineer investigating?

   • ANetwork layer, because the engineer should check the routing path for congestion.
   • BSession layer, because the engineer should check the database session state.
   • CTransport layer, because TCP window size and flow control are Transport layer functions.
   • DPresentation layer, because the engineer should check data compression.
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