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If we know that a host's IP address is 209.111.34.97/30.
Which of the following is its Net ID?
209.111.34.0
209.111.34.64
209.111.34.128
209.111.34.96
You must first convert the IP address and Subnet mask into binary to find the Network ID. IP address : 11010001-01101111-00100010-01100001 Mask: 11111111-11111111-11111111-11111100 Network ID: 11010001-01101111-00100010-01100000 The last octet in the network ID is calculated by finding the matching "1" bits in the IP address and the subnet mask. This adds up to 96 therefore the correct answer is 209.111.34.96
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