Subnetting Exercise

Use an IP calculator, such as the one available at http://jodies.de/ipcalc or http://www.subnet-calculator.com/ to complete the following. Give all IP addresses in dotted decimal.

  1. Given IP address 126.106.92.38 and netmask 255.255.0.0,

    a) What is the network address?

    b) What is the maximum number of hosts that could be in this network?
  2. Given IP address 150.123.45.80 and netmask 255.255.255.192,

    a) What is the network address?

    b) What is the host number? Careful, this is a little tricky.

    c) What is the maximum number of hosts that could be in this network?
  3. Given a host with IP addresses 172.25.17.31/21

    a) Is a host with IP address 172.25.15.202/21 part of the same network?

    b) Is a host with IP address 172.25.18.231/21 part of the same network?
  4. Suppose that you have been assigned the 138.90.128.0/17 network address block and you need to establish four subnets from this block.

    a) List the network addresses for each of the four subnets.

    b) How many hosts can be in each subnet?

    c) If you add up the total number of hosts for all the subnets it is less than the total hosts possible in the original network. Why is this the case?

    d) List the range of host IP addresses for the first subnet.

    e) What is the broadcast address for the first subnet?
  5. Given the class C network address 222.85.64.0/24, determine what netmask will allow creating subnets that can accomodate the indicated number of hosts with as many subnets as possible:

    a. 15 hosts (also indicate how many subnets are possible)

    b. 28 hosts (also indicate how many subnets are possible)

    c. 10 hosts (also indicate how many subnets are possible)
Topic revision: r1 - 2013-11-07 - JimSkon
 
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