Question

In: Computer Science

a) A new department has been established with 405 hosts that require addresses. Currently the company...

a) A new department has been established with 405 hosts that require addresses. Currently the company uses the 20.10.0.0/19 address space. How many bits must the network administrator borrow to provide addresses for this subnet without wasting addresses?

b) Consider an Internet address of the form 12.42.184.0/20. What does the /20 signify?

Solutions

Expert Solution

a) Given IP Address: 20.10.0.0/19

Required hosts = 405

To provide 405 hosts we need atleast 9 bits. Thus 32 - 9 = 23.

Thus, the subnet Mask is 23.

Network administrator should borrow 4 bits.

Address:   20.10.0.0                     00010100.00001010.0000000 0.00000000

Netmask:   255.255.254.0 = 23    11111111.11111111.1111111 0.00000000

Wildcard: 0.0.1.255                     00000000.00000000.0000000 1.11111111

Network:   20.10.0.0/23                00010100.00001010.0000000 0.00000000 (Class A)

Broadcast: 20.10.1.255                   00010100.00001010.0000000 1.11111111

HostMin:   20.10.0.1                      00010100.00001010.0000000 0.00000001

HostMax:   20.10.1.254                  00010100.00001010.0000000 1.11111110

Hosts/Net: 510

b)

Address:   12.42.184.0                  00001100.00101010.1011 1000.00000000

Netmask:   255.255.240.0 = 20    11111111.11111111.1111 0000.00000000

Wildcard:  0.0.15.255                   00000000.00000000.0000 1111.11111111



Network:   12.42.176.0/20            00001100.00101010.1011 0000.00000000 (Class A)

Broadcast: 12.42.191.255             00001100.00101010.1011 1111.11111111

HostMin:   12.42.176.1                 00001100.00101010.1011 0000.00000001

HostMax:   12.42.191.254            00001100.00101010.1011 1111.11111110

Hosts/Net: 4094

Please Rate....If you like the answer.....

venereology answered 2 years ago
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