(7pts) We wish to assign a CIDR block of 1024 addresses (including all 0’s and a
ID: 3640305 • Letter: #
Question
(7pts) We wish to assign a CIDR block of 1024 addresses (including all 0’s and all 1’s), starting at 128.211.192.0.What is the maximum address in this block? [Hint: figure out how many bits are required to represent 1024 hosts. The maximum address is when all those bits are 1]
How many bits are in the host id?
How many bits are in the net id?
What is the mask in binary, dotted decimal, and slash notation?
(6pts) A CIDR block extends from 112.45.156.0 to 112.45.159.255.
How many bits are in the net id?
How many bits are in the host id?
What is the mask in binary, dotted decimal, and slash notation?
(6pts) An ISP has CIDR block 156.94.0.0/16. The ISP wants to create 18 sub-blocks from this block.
How many bits should the ISP add to the mask for the sub-blocks?
What are the addresses (include slash notation) for each sub-block?
What is the maximum number of hosts in each sub-block?
(5pts) Assume that NJIT has a CIDR address space 128.235.204.0/19. Which of the following addresses could be host addresses within that space?
135.235.160.0
135.235.204.117
136.235.205.1
135.235.204.255
135.236.207.223
Explanation / Answer
7 pts - Maximum Address: 128.211.195.255 (Broadcast ID) Host Bits: 10 Net Bits: 22 Mask: Binary: 11111111111111111111110000000000 Dotted Dec: 255.255.240.0 Slash: /22 6 pts - Net ID: 22 bits Host ID: 10 bits Mask: Binary: 11111111111111111111110000000000 Dotted Dec: 255.255.240.0 Slash: /22 6 pts - Add 5 bits to the mask. Addresses: 156.94.8.0 156.94.16.0 156.94.24.0 156.94.32.0 156.94.40.0 156.94.48.0 156.94.56.0 156.94.64.0 156.94.72.0 156.94.80.0 156.94.88.0 156.94.96.0 156.94.104.0 156.94.112.0 156.94.120.0 156.94.128.0 156.94.136.0 156.94.144.0 Each subnet can support up to 2046 hosts The 128.235.204.0/19 range goes from 128.192.0.0 to 128.223.255.255 None of the hosts given are in that range.
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