1. Your company has been allocated the Class C network address 200.69.1.0 (i.e.

Question

1. Your company has been allocated the Class C network address 200.69.1.0 (i.e. /24). You wish to subnet your network such that each subnetwork in your installation should allow 22 hosts per subnet. Make sure to use / notation when specifying subnet/host addresses. Show reasons/work. Ditto marks may be used where appropriate.

a) How many SUBNETS will the network have with allocation of 22 HOSTS PER SUBNET?

b) What is the MAXIMUM number of HOSTS assigned to each SUBNET? How many of the HOSTS are usable?

c) What is the subnet mask for this new subnet scheme?

Explanation / Answer

1a) To identify 22 hosts, we need at least 5 bits. (2210 = 101102). In a class C address, the first 3 octets represent the Net ID. So, from the 4th octect, we need last 5 bits for host ID. Hence, the 1st 3 bits of the last octet will represent the subnet. Total number of subnets is 23 -2 = 6 (.0 is the network ID and the .255 is the broadcast ID) The subnet mask is 255.255.255.224 or /27.

1b) Number of possible hosts is 25 = 32. Maximum number of usable hosts that can be assigned to each subnet is 25 - 2 = 30. (1 adderess is for subnet ID and 1 address is broadcast IP (200.69.1.224 is the subnet id and 200.69.1.255 is the broadcast id and cannot be assigned as IP to any host). All 30 hosts are usable.

1c) The subnet mask is 255.255.255.224 or /27

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