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CTI 120Supernetng ExerciseThis Exercise will introduceSupernetng, which allows you to address a network and make the mostefcient use out oF your IP addresses.Given: A ne±work address of 172.16.0.0 /22/22 means that out oF that address, 22 bits are network bits.There are 32 bits in an IPv4 address, so32-22equals10bits.This means 22 bits are network, and 10 bits are le± over For addressing hosts.2^10= 1,024 available addresses For assigning to computers, printers, servers, etc. (minus 2 addresses,the lowest address will always be the network address, and the highest will be the broadcast address).There will be the Following subnets that need to be addressed, and the number oF host addresses Foreach subnet are:S±uden± LAN481Ins±ruc±or LAN69Adminis±ra±or LAN23WAN Link2I have ordered ±he ne±works from larges± ±o smalles±, which is how you should s±ar± alloca²ng addressranges.S±ar²ng wi±h ±he S±uden± LAN, we ask ourselves ±his ques²on: How many hos± bi±s do we need ±o give±he S±uden± LAN a± leas± 481 addresses?Using binary ma±h, 2^ ±o wha± power will be equal or grea±er ±han 481?2^9= 512, which sa²sFes ±he addresses needed.32-9= 23, so we will keep 9 bi±s for hos± addressing and ±he ne±work bi±s will be 23. This is our newcus±om subne± mask for ±he s±uden± LAN: /23 = 255.255.254.0Ano±her way of looking a± ±his is ±o ±urn on 23 bi±s: 11111111.11111111.11111110.00000000How many 1 bi±s are ±here?Does ±his ma±ch ±he slash forma± given above for ±his subne±s’ mask?So, ±he ne±work address for ±he S±uden± LAN is:172.16.0.0 (assigned by ISP and canno± be changed. This is ±he lowes± possible address)The range of addresses are:172.16. 0.1-172.16.1.254 (The addresses be±ween ±he ne±work andbroadcas± address)The broadcas± address for ±he S±uden± LAN is:172.16.1.255 (This is ±he highes± possible address)1.²ill in the Excel Spread sheet posted on Moodle (VLSM_Example) with the proper inForma³on Forthe Student LAN. Color code the range oF IP Addresses to match the Student LAN color (Yellow).This will help you to see what addresses are being used in each LAN.2.²ollow this same logic to determine the address ranges For the remaining networks. ²ill out thespread sheet and color code each network accordingly.

Addressing and tesTng the NetworkNow it’s Tme to put our IP scheme in acTon and test it to see if it will work as planned:3.Based on our superne±ng exercise spreadsheet, this is the addressing scheme we intend toimplement:Network AddressHost AddressesBroadcast AddressStudent LAN /23172.16.0.00.1-1.254172.16.1.255Instructor LAN /25172.16.2.02.1-2.126172.16.2.127Admin LAN /27172.16.2.1282.129-2.158172.16.2.159WAN /30172.16.2.1602.161-2.162172.168.1.1634.Use the table below to address each network device:DeviceInterfaceIP AddressSubnet MaskDefault GatewayRouter 1Fa0/0172.16.2.129255.255.255.224NAS2/0172.16.2.161255.255.255.252NARouter 2Fa0/0172.16.2.1255.255.255.128NAFa1/0172.16.0.1255.255.254.0S2/0172.16.2.162255.255.255.252Admin PCFastEthernet0172.16.2.158255.255.255.224172.16.2.129Instructor PCFastEthernet0172.16.2.126255.255.255.128172.16.2.1Student PCFastEthernet0172.16.1.254255.255.254.0172.16.0.15.Open the ²leSuperne±ngExercise.pkt (If you don’t have Packet ³racer installed download itfrom the bo´om of yourMoodlepage and install it on your computer).6.Click on theAdministraTon Computer, then clickConfg.7.Enter in theDeFault Gatewayaddress from the table above.8.Click²astEthernet0, and enter the IP address and subnet mask from the table above.9.Repeat steps 6, 7, and 8 to address the Instructor and Student PC.10.Click onRouter 1, and select CLI (Command Line Interface).11.At the Router prompt typeenable, and pressEN³ER.12.³ypeconfg t, and pressEN³ER.13.³ypehostname Router1, and pressEN³ER. What is the result of this command?14.³o con²gure the Fa0/0 interface, typeint Fa0/0, and pressEN³ER.15.³ype ip address 172.16.2.129 255.255.255.224, and pressEN³ER.16.³ypeno shut, and pressEN³ER.Commands 11 and 12 have assigned the interface an IP address and subnet mask, and theinterface should always be up even if the router reboots.17.³ypeint s2/0, and pressEN³ER.18.³ypeip address 172.16.2.161 255.255.255.252,and pressEN³ER.19.³ypeclock rate 64000, and pressEN³ER.20.³ypeno shut, and pressEN³ER.Commands 14-16 have assigned the interface an IP address and subnet mask, and the interfaceshould always be up even if the router reboots. In addiTon, this interface will be the “clock” tosynchronize Tming signals on the WAN link between the two routers (Don’t worry If the

interface state is changed to “down”, it will come up once you have conFgured the other routerinterface it is aTached to on Router 2).21.±ypeexit, and pressENTER.22.±ypeRouter rip, and pressENTER.23.±ypeversion 2, and pressENTER.24.±ypenetwork 172.16.2.0, and pressENTER.Commands 18-20 Install the RIP version 2 rou²ng protocol, and this router will adver²se, or tellother routers about the networks it is directly connected to (±he admin LAN and the WAN).25.PressCTRL+Zkeys and pressENTER.26.Save your router conFgura²on: ±ypecopy run start, and pressENTER. Accept the default Flename by pressingENTERto conFrm. Your changes are saved.27.Click onRouter 2, and select CLI (Command Line Interface).28.At the Router prompt typeenable, and pressENTER.29.±ypeconfg t, and pressENTER.30.±ypehostname Router2, and pressENTER.31.±o conFgure the ³a0/0 interface, typeint Fa0/0, and pressENTER.32.±ype ip address 172.16.2.1 255.255.255.128, and pressENTER.33.±ypeno shut, and pressENTER.34.±o conFgure the ³a0/1 interface, typeint Fa1/0, and pressENTER.35.±ype ip address 172.16.0.1 255.255.254.0, and pressENTER.36.±ypeno shut, and pressENTER.37.±ypeint s2/0, and pressENTER.38.±ypeip address 172.16.2.161 255.255.255.252,and pressENTER.39.±ypeno shut, and pressENTER.40.±ypeexit, and pressENTER41.±ypeRouter rip, and pressENTER.42.±ypeversion 2, and pressENTER43.±ypenetwork 172.16.0.0, and pressENTER44.±ypenetwork 172.16.2.0, and pressENTER45.PressCTRL+Zkeys and pressENTER.46.Save your router conFgura²on: ±ypecopy run start, and pressENTER. Accept the default Flename by pressingENTERto conFrm. Your changes are saved.Confrming and Tes±ng your Network Confgura±on47.Click onRouter1, and chooseCLI.48.If necessary, typeenable, and pressENTERto change your prompt from a>to#(restricted usermode to privileged exec mode).49.±ypeshow run, and pressENTER.50.Review the se´ngs in this Fle and verify that the interfaces are addressed properly and that thenetwork statements are correct. Viewing the running conFg Fle is useful to troubleshootconFgura²on errors.51.±ypeshow ip int brieF, and pressENTER. Are the interfaces that you conFgured line and protocolup?If not, then this helps isolate which interface has a problem.52.±ypeshow ip route, and pressENTER. ±he output shows the rou²ng table.53.How many directly connected routes are there? Is there a route to the networks not directlyconnected (HIN±: look for (R)routes)?If you cannot communicate with any of the networks,

viewing the rouTng table can help troubleshooTng by determining if there is a route to thatnetwork. No route, no communicaTon can occur between the networks.54.±ypeping 172.16.2.162, and pressENTER. What happens?55.If successful, you have communicaTon between the two WAN links.56.±ypeping 172.16.0.1, and pressENTER.What happens?57.If successful, you have communicaTon between Router1 and the Student LAN gateway.58.±ypeping 172.16.2.1, and pressENTER. What happens?59.If successful, you have communicaTon between Router1 and the Instructor LAN gateway.60.If any of the above pings failed, then you have a problem to troubleshoot. Please resolve theissue before going any further.61.Click on theAdministra±on PC, then chooseDesktop, Command Prompt.62.±ypeipconfg, and pressENTER. Note the gateway address. ±his is the router that lets traFc inand out of the AdminisraTon LAN.63. Pingthe gateway address. What happens?If not successful, then you have a problem totroubleshoot. You can use ping to ²gure out where a problem exists on a network. When a pingto an address fails, then that interface has a problem.64.±ypeping 172.16.2.161(±his is Router1 Serial (WAN) interface), and pressENTER. Whathappens?If not successful, then troubleshoot.65.±ypeping 172.16.2.162(±his is Router2 Serial (WAN) interface, and pressENTER. Whathappens?If not successful, then troubleshoot.66.±ypeping 172.16.2.1(±his is Router 2 fa0/0 interface, which is the Gateway for the InstructorLAN), and pressENTER. What happens?If not successful, then troubleshoot.67.±ypeping 172.16.0.1(±his is Router 2 fa1/0 interface, which is the Gateway for the StudentLAN),, and pressENTER. What happens?If not successful, then troubleshoot.68.±ypeping 172.16.2.126(Instructor PC), and pressENTER. What happens?If not successful, thentroubleshoot.69.±ypeping 172.16.1.254 (Student PC), and pressENTER. What happens?If not successful, thentroubleshoot.70.If all the above pings were successful,congratulaTons!Your network is up and running. If not,troubleshoot unTl all pings are successful.****Turn in the VLSM excel spreadsheet, the Packet Tracer fle, and this document For yourLab Grade***

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