Galt Computing Corp. has remote sites in Sandusky, Findlay, Fremont, and Fostori
ID: 3630930 • Letter: G
Question
Galt Computing Corp. has remote sites in Sandusky, Findlay, Fremont, and Fostoria in addition to their main site in Toledo. There are currently 62 devices connected to the network in Sandusky, 60 computers in Findlay, 30 computers in Fremont, 30 computers in Fostoria, and 64 computers in Toledo. It is likely that there will be additional computers added in Toledo within the year. The IT plan calls for connecting all four sites using T-1 data lines between sites. The Toledo site will also connect to the Internet and has elected to use public IP address space on all computers at each of the sites. Their ISP has a restricted amount of IP addresses available. Unfortunately, the ISP cannot produce a plan to assign IP address space and has offered any of the following IP address blocks to Galt Computing:10.0.0.0/8
63.125.138.0/24
63.126.137.0/25
63.127.136.0/24
63.128.135.0/24
63.128.136.0/24
63.128.137.0/24
127.0.0.0/8
192.168.0.0/16
206.122.148.0/24
225.113.8.0/24
225.113.9.0/24
Propose a network plan that will efficiently utilize the IP address space that has been allotted to them.
Explanation / Answer
As each of the following IP address blocks has subnet mask 24, they can accommodate 254 host computers because 8 bits are left for host addresses. The IP address blocks are: 63.125.138.0/2463.127.136.0/2463.128.135.0/2463.128.136.0/2463.128.137.0/24206.122.148.0/24225.113.8.0/24225.113.9.0/24 The address blocks starting with 63 are all class A addresses. As a class A address block can accommodate 16 million hosts, using class A addresses for a small number of hosts will waste the IP addresses. Similarly the IP address block 127.0.0.0/8 and 192.168.0.0/16 also waste the IP addresses remaining unassigned. Address block127.0.0.0/8 is a class B address and 192.168.0.0/16 is a class C address with mask 16. The address blocks 225.113.8.0/24 and 225.113.9.0/24 are class D addresses which are reserved for multicast addressing. So the address block 206.122.148.0/24 which is a class C address block with 254 host capacity can server the purpose of Galt Computing Corp as they need 182 host addresses in total. It also leaves 8 addresses remaining which can be used further. If mare number of new hosts are expected at Toledo, it can be assigned with a class B address block accommodating less number of required hosts.
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