NCTI TECH 3-4 FINAL EXAM WITH
CORRECT ANSWERS 2025
TheWopenWsystemWinterconnectionWmodelW(OSI/R<)WNetworkWlayerWservesWwhichWprimaryWfunction?W-
WCORRECTWANSWERW-ItWusesWlayerW3WaddressesWtoWcreateWmultipleWroutedWnetworks
TheWaddressW68.56.189.17WbelongsWtoWwhichWinternetWprotocolWIPWclass?W-WCORRECTWANSWERW-ClassWA
WhatWhappensWtoWaWdatagramWsentWbyWaWhigherWlevelWprotocolWtoWaW127.x.y.zWaddress?W-
WCORRECTWANSWERW-
TheWdatagramWloopsWbackWinsideWtheWhostWandWneverWleavesWtheWnetworkWinterfaceWcard(NIC)
WhichWdeviceWevaluatesWandWactsWuponWaWpacket'sWinternalWprotocolW(IP)Waddress?W-
WCORRECTWANSWERW-Router
TheWnetworkWlayerWmustWdoWwhatWtoWaWreceivedWframe,WinWorderWtoWdetermineWtheWrouteWoverWwhich
WitWwillWforwardWtheWdatagramWtoWtheWnextWnetworkW-WCORRECTWANSWERW-DecapsulateWtheWpacket.
WhatWnetworkWinformationWcanWbeWdeterminedWfromWaWlogicalWinternetWprotocol(IP)Waddress?W-
WCORRECTWANSWERW-TheWhostWportionWandWnetworkWportion.
TheWphysicalWaddressWofWaWdeviceWisWprocessedWbyWwhichWlayerWofWtheWopenWsystemsWinterconnectionW
referenceWmodel(OSI/RM)W-WCORRECTWANSWERW-TheWdataWlinkWlayer
WhichWlayerWofWtheWopenWsystemWinterconnectionWreferenceWmodelW(OSI/RM)WwouldWyouWsuspectWasWb
eingWtheWproblemWwhenWpacketsWarrivingWatWtheWserverWbutWnoWinformationWisWbeingWreturnedWtoWtheW
client?W-WCORRECTWANSWERW-TheWtransportWlayer
AllWcomputersWrunningWonWtheWtransmissionWcontrolWprotocol/internetWprotocolW(TCP/IP)WsuiteWhaveWw
hichWofWtheWfollowingWinWcommon?W-WCORRECTWANSWERW-
EachWcomputerWisWassignedWitsWownWinternetWprotocol(IP)Waddress.
AWrepeaterWoperatesWatWwhichWlayerWofWtheWopenWsystemsWinterconnectionWreferenceWmodelW(OSI/RM)
?W-WCORRECTWANSWERW-TheWphysicalWlayer
CORRECT ANSWERS 2025
TheWopenWsystemWinterconnectionWmodelW(OSI/R<)WNetworkWlayerWservesWwhichWprimaryWfunction?W-
WCORRECTWANSWERW-ItWusesWlayerW3WaddressesWtoWcreateWmultipleWroutedWnetworks
TheWaddressW68.56.189.17WbelongsWtoWwhichWinternetWprotocolWIPWclass?W-WCORRECTWANSWERW-ClassWA
WhatWhappensWtoWaWdatagramWsentWbyWaWhigherWlevelWprotocolWtoWaW127.x.y.zWaddress?W-
WCORRECTWANSWERW-
TheWdatagramWloopsWbackWinsideWtheWhostWandWneverWleavesWtheWnetworkWinterfaceWcard(NIC)
WhichWdeviceWevaluatesWandWactsWuponWaWpacket'sWinternalWprotocolW(IP)Waddress?W-
WCORRECTWANSWERW-Router
TheWnetworkWlayerWmustWdoWwhatWtoWaWreceivedWframe,WinWorderWtoWdetermineWtheWrouteWoverWwhich
WitWwillWforwardWtheWdatagramWtoWtheWnextWnetworkW-WCORRECTWANSWERW-DecapsulateWtheWpacket.
WhatWnetworkWinformationWcanWbeWdeterminedWfromWaWlogicalWinternetWprotocol(IP)Waddress?W-
WCORRECTWANSWERW-TheWhostWportionWandWnetworkWportion.
TheWphysicalWaddressWofWaWdeviceWisWprocessedWbyWwhichWlayerWofWtheWopenWsystemsWinterconnectionW
referenceWmodel(OSI/RM)W-WCORRECTWANSWERW-TheWdataWlinkWlayer
WhichWlayerWofWtheWopenWsystemWinterconnectionWreferenceWmodelW(OSI/RM)WwouldWyouWsuspectWasWb
eingWtheWproblemWwhenWpacketsWarrivingWatWtheWserverWbutWnoWinformationWisWbeingWreturnedWtoWtheW
client?W-WCORRECTWANSWERW-TheWtransportWlayer
AllWcomputersWrunningWonWtheWtransmissionWcontrolWprotocol/internetWprotocolW(TCP/IP)WsuiteWhaveWw
hichWofWtheWfollowingWinWcommon?W-WCORRECTWANSWERW-
EachWcomputerWisWassignedWitsWownWinternetWprotocol(IP)Waddress.
AWrepeaterWoperatesWatWwhichWlayerWofWtheWopenWsystemsWinterconnectionWreferenceWmodelW(OSI/RM)
?W-WCORRECTWANSWERW-TheWphysicalWlayer
