Jbenson_Lab13.docx - Liberty University CSIS 331 Lab 13...

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Liberty University CSIS 331 Lab 13 Subnetting Worksheet Topology Requirements IPv4 Addressing Create subnets that meet the host requirements using 192.168.100.0/24. NOTE: You may use the table on the last page as a reference to assist you. Step 1: Subnet the 192.168.100.0/24 network into the appropriate number of subnets. a. Based on the topology and host requirements, how many subnets are needed? _____ NOTE: Don t forget the routers need one subnet to talk to each other. So far your ʻ Subnet Bitmap looks like this: nnnnnnnn . nnnnnnnn . nnnnnnnn . hhhhhhhh ( n=network bits covered by subnets mask h = host bits ) b. How many bits, if any, must be borrowed to support the number of subnets needed in the topology table? n =____ (Formula is 2 n = subnets). n being the number of subnet bits. NOTE: Remember you have a 24 bit subnet mask (Class C). The binary form looks like this 11111111.11111111.11111111.00000000. How many bits do you need get the amount of subnets you need?Try to use the formula 2 n to calculate close to what you need. For example you don t need 62 subnets. ʻ
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c. How many subnets does this create? ____ = 2 n d. How many usable hosts does this create per subnet? _____ NOTE: Always subtract 2 host IP s for Network and Broadcast IP addresses. You ʻ already have 2 8 - 2 = 254 hosts before subnetting but you do not need that many hosts per subnet. (n=network/mask bits covered by subnets mask, s=subnet bits h = host bits) Your binary bitmap should now look something like this. nnnnnnnn . nnnnnnnn . nnnnnnnn . ssss hhhh ( n=network/mask bits covered by subnets mask, s=subnet bits h = host bits ). However many bits you borrowed you add to the CIDR of /24. For example if you borrowed 4 extra bits then your CIDR would be /28. e. Calculate the binary value for the first five subnets.. The first subnet is already shown. List them in the table below. Remember these binary values: 128 64 32 16 8 4 2 1. Subtract from left to right to get your binary answer. If there is a remainder that matches closely to binary column enough to subtract mark a 1 in that column otherwise mark a 0. You should have eight 0 and 1s 1 st Octet: Can you subtract 128 from 192? Yes. Place a 1 in the 1
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  • Fall '18
  • Instructor Jeremy Rabon
  • IP address, Subnetwork, Classless Inter-Domain Routing

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