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Lecture11: homework An organization has a class C network 199.199.1 and wants to form subnets for four deppartments 1~4,, with hosts of 20,, 31, 33, 75. Continuous IP address blocks are preferred, please provide the network address, broadcasting address and network mask for each department. Suppose the 4 departments are equipped with router A~D as the gateway to the inner network of this organization. RouterRouter EE locateslocates inin thethe edgeedge ofof thisthis networknetwork, andand connectsconnects toto A~D directly. Provide the CIDR based routing table for router E with the destination to A~D. IfIf oneone IPIP packetpacket withwith destinationdestination IPIP ofof 199.199.1.191,199.199.1.191, howhow can router E find the next hop to forward it, provide the matching process. ((a)) Solution Since the number of hosts is 20, 31, 33, 75, and each department requires at least 2 more IP addresses ( one for network, one for broadcast, possiblepossible additionaladditional oneone moremore forfor thethe gatewaygateway inin LANLAN )), thenthen thethe requirements are 22, 33, 35, 77. 7 6 5 5 The nominal subnet sizes are 128=2 , 64=2 , 32=2 , 32=2 respectively. Considering the continuous IP requirement, the IP allocation result is as following #host in Dept No. Subnet Max # IP Subnet bit Subnet Mask 35 1 64 199.199.1.0000 0000 255.255.255.1100 0000 33 2 64 199.199.1.0100 0000 255.255.255.1100 0000 3 64 199.199.1.1000 0000 255.255.255.1100 0000 77
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