Data communication and network oral test

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Data communication and network oral test

  1. 1. Data Communication and Network Oral Test Let’ssay the networkisjustfinishedinstallation.Sowe wanttotestthe network.We have tosent PINGfrom PC1 to the serverinorderto make sure the connectionisworking.The PC1ispersonal computerwithWindowsXPOS. STEP 1 WhenpC1 type PING,for instance: PING192.168.30.1  it isthe addressof SRV1.In thiscase the addressof PC1 is 192.168.10.1. We call it differentsubnet. PC1 starts buildingthe packet.The packetwon’tleave PC1if itisnot completedwithMACaddress source and destination,IPaddresssource anddestination. MAC addressof PC1 : A1 : B1 : C1 : D1 : E1 : F1  the source MAC addressRouter : A5 : B5 : C5 : D5 : E5 : F5  the destination IP addressof PC1 : 192.168.10.1  source IP addressSRV : 192.108.30.1  final destination  The packet can leave nowbecause itiscompleted. STEP 2 The packet isnowenteredportnumber1, switch1. Defaultgateway(type) router:E0  192.168.10.100  same subnetmaskwithPC1. The packet enteredE0,the routercheckedMAC addressdestinationIPdestination. The router hascapabilityof determiningwhichnetworkislocal,whichisremote. The router checksthe IP addressdestinationandfoundthe subnetmaskisdifferent. E0 E0 S0 S0
  2. 2.  Same  block  Different pass STEP 3 Routerconsultsthe routingtable.The routingtable hasconfiguredbyadminusingstaticrouting.So the table consistnexthoprouter/IPaddress:192.168.30.0. The outgoinginterface isS0because adminconfigure it. Routerfoundthe outputexitinterface isS0.Because router1and router2alreadyconfiguredby staticrouting,the packetpassed to router2E0. The E0 isdefaultnetworkgatewayof SRV1. STEP 4 Because the router2is directlyconnectedtoSRV throughswitch2finallythe packetarrivedatSRV1 and SRV1 preparingtoresponse the PINGtest.

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