Determine the number of bits that need to be borrowed from the host portion of t
ID: 3703184 • Letter: D
Question
Determine the number of bits that need to be borrowed from the host portion of the network address and the number of bits that will be left for host addresses.
Fill in the following table for all the subnets that your subnetting of the network creates. This may be more than actually needed to satisfy the above requirement.
Subnet
number
Subnet
ID binary value
Host bits
binary
range
Last octet binary range
Last octet decimal range
IP range
197.15.22.0
Usable
0
00…
…0000-…1111
00000000-
00..1111
0-2n-1
197.15.22.0-
197.15.22.2n-1
No
1
001
…0000-…1111
00000000-
00..1111
32
197.15.22.32
Yes
2
010
…0000-…1111
00000000-
00..1111
64
197.15.22.64
Yes
3
011
…0000-…1111
00000000-
00..1111
96
197.15.22.96
Yes
4
100
…0000-…1111
00000000-
00..1111
128
197.15.22.128
Yes
5
101
…0000-…1111
00000000-
00..1111
160
197.15.22.160
Yes
6
110
…0000-…1111
00000000-
00..1111
192
197.15.22.192
Yes
7
111
…0000-…1111
00000000-
00..1111
224
197.15.22.224
No
Use the table just developed to help answer the following questions:
Which octet(s) represent the network portion of a Class C IP address?
The first three octets by default
Which octet(s) represent the host portion of a Class C IP address?
The last three octets represent the host portion.
For the subnets you defined how many bits in total represent the network portion of the IP address?
For the subnets you defined how many bits are left in the fourth octet for host IDs?
What subnet mask must be used for the subnets you defined? Give the subnet mask in both decimal and binary.
What is the maximum number of subnets that can be created with this subnet mask (in answering this question ignore the consideration of whether a particular subnet is usable or not)
What is the maximum number of useable subnets that can be created with this mask?
How many hosts per subnet can be in the subnets you have created? Assume the lowest and highest host ID in each subnet cannot be used.
Why can’t the lowest and highest address in each subnet be used?
What is the maximum number of hosts that can be defined for all subnets with this scenario if the all 0’s and all 1’s subnets cannot be used but all others can be? Assume the lowest and highest host ID in each subnet cannot be used.
Answer the previous question again, but now assume the all 0’s and all 1’s subnets can be used
Is 197.15.22.63 a valid host IP address with this scenario? Why or why not?
Is 197.15.22.160 a valid host IP address with this scenario? Why or why not?
Host A has an IP address of 197.15.22.126. Host B has an IP address of 197.15.22.129. Are these hosts on the same subnet? Why?
Subnet
number
Subnet
ID binary value
Host bits
binary
range
Last octet binary range
Last octet decimal range
IP range
197.15.22.0
Usable
0
00…
…0000-…1111
00000000-
00..1111
0-2n-1
197.15.22.0-
197.15.22.2n-1
No
1
001
…0000-…1111
00000000-
00..1111
32
197.15.22.32
Yes
2
010
…0000-…1111
00000000-
00..1111
64
197.15.22.64
Yes
3
011
…0000-…1111
00000000-
00..1111
96
197.15.22.96
Yes
4
100
…0000-…1111
00000000-
00..1111
128
197.15.22.128
Yes
5
101
…0000-…1111
00000000-
00..1111
160
197.15.22.160
Yes
6
110
…0000-…1111
00000000-
00..1111
192
197.15.22.192
Yes
7
111
…0000-…1111
00000000-
00..1111
224
197.15.22.224
No
Explanation / Answer
Solution:
The first four subparts have been answered as per Chegg guidelines, please repost others.
Which octet(s) represent the network portion of a Class C IP address?
The first three octets by default
Which octet(s) represent the host portion of a Class C IP address?
The last one octet represent the host portion. Number of hosts = 2^8 - 2= 254
For the subnets you defined how many bits in total represent the network portion of the IP address?
27 bits defined the network portion of the IP address in the above-given table.
For the subnets you defined how many bits are left in the fourth octet for host IDs?
3 bits
What subnet mask must be used for the subnets you defined? Give the subnet mask in both decimal and binary.
255.255.255.224
What is the maximum number of subnets that can be created with this subnet mask (in answering this question ignore the consideration of whether a particular subnet is usable or not)
2^5 = 32 hosts can be there.
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