An ISP is granted the block 80.70.56.0/21. The ISP needs to allocate addresses for two organizations...

An ISP is granted the block 80.70.56.0/21. The ISP needs to allocate addresses for

two organizations each with 408 hosts, two organizations each with 128 hosts, and three

organizations each with 42 hosts.

• Find the number and range of addresses in the ISP block.

• Find the range of addresses for each organization and the range of unallocated addresses.

• Show the outline of the address distribution and the forwarding table.

Solutions

Expert Solution

Given Major Network address of the block is : 80.70.56.0/21

Network ID = 21 bits.

Host ID = 32 - 21 = 11 bits.

Number of addresses possible = 2¹¹ = 2048.

Range:

Network:: 01010000.01000110.00111 000.00000000 ==> 80.70.56.0/21
Broadcast: 01010000.01000110.00111 111.11111111 ==>80.70.63.255
HostMin: 80.70.56.1
HostMax: 80.70.63.254

Therefore, Address Range is 80.70.56.0 - 80.70.63.255

Address distribution and Unallocated address range:

Subnet/ Organization	Number of Hosts Addresses required	Number of Hosts Addresses allocated	Network Address	Subnet Mask	Host Address Range	Broadcast Address	Number of addresses unallocated	Address range unused
A	408	510	80.70.56.0	/23	80.70.56.1-80.70.57.254	80.70.57.255	102	80.70.57.153-80.71.57.254
B	408	510	80.70.58.0	/23	80.70.58.1-80.70.59.254	80.70.59.255	102	80.70.59.153-80.70.59.254
C	128	254	80.70.60.0	/25	80.70.60.1-80.70.60.254	80.70.60.255	126	80.70.60.129-80.70.60.254
D	128	254	80.70.61.0	/25	80.70.61.1-80.70.61.254	80.70.61.255	126	80.70.61.129-80.70.61.254
E	42	62	80.70.62.0	/26	80.70.62.1-80.70.62.62	80.70.62.63	20	80.70.62.43-80.70.62.62
F	42	62	80.70.62.64	/26	80.70.62.65-80.70.62.126	80.70.62.127	20	80.70.62.107-80.70.62.126
G	42	62	80.70.62.128	/26	80.70.62.129-80.70.62.191	80.70.62.192	20	80.70.62.172-80.70.62.191

Address Range unallocated is : 80.70.62.193 - 80.70.63.255

Forwarding Table:

Organization	Network ID	Subnet mask	Interface
A	80.70.56.0	255.255.254.0 (/23)	e0
B	80.70.58.0	255.255.254.0 (/23)	e1
C	80.70.60.0	255.255.255.128 (/25)	e2
D	80.70.61.0	255.255.255.128 (/25)	e3
E	80.70.62.0	255.255.255.192 (/26)	e4
F	80.70.62.64	255.255.255.192 (/25)	e5
G	80.70.62.128	255.255.255.192 (/25)	e6
-	0.0.0.0	0.0.0.0	e7 (default entry)

venereology answered 1 year ago

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