Question

An isp is granted the block 80.70.56.0/21. The isp needs to allocate addresses for two organizations each with 500 addresses, two organizations each with 250 addresses, and three organizations each with 50 addresses. A. Find the number and range of addresses in the isp block. B. Find the range of addresses for each organization and the range of unallocated addresses. C. Show the outline of the address distribution and the forwarding table.

Answer 1

Answer:

A. No. of addresses= 2^11

Range of addresses= 80.70.56.0/21 -80.70.63.255/21

B. 80.70.56.0/23 - 80.70.57.255/23 (512 addresses)

80.70.58.0/23 - 80.70.59.255/23 (512 addresses)

80.70.60.0/24 - 80.70.60.255/24 (256 addresses)

80.70.61.0/24 - 80.70.61.255/24 (256 addresses)

80.70.62.0/26 -80.70.62.63/26 (64 addresses)

80.70.62.64/26- 80.70.62.127/26 (64 addresses)

80.70.62.128/26 - 80.70.62.191/26 (64 addresses)

addresses are always assigned in the power of 2.

unallocated addresses :80.70.62.192/26 - 80.70.63.255/26

C. see the attachment for distribution. draw routing table yourself.

Explanation:

Answer 2

(A) No. of addresses= 2^11.

Range of addresses= 80.70.56.0/21 -80.70.63.255/21.

(B) 80.70.56.0/23 - 80.70.57.255/23 (512 addresses).

80.70.58.0/23 - 80.70.59.255/23 (512 addresses).

80.70.60.0/24 - 80.70.60.255/24 (256 addresses).

80.70.61.0/24 - 80.70.61.255/24 (256 addresses).

80.70.62.0/26 -80.70.62.63/26 (64 addresses).

80.70.62.64/26- 80.70.62.127/26 (64 addresses).

80.70.62.128/26 - 80.70.62.191/26 (64 addresses).

addresses are always assigned in the power of 2.

unallocated addresses :80.70.62.192/26 - 80.70.63.255/26.

(C) see the attachment for distribution. draw routing table yourself.

What do you mean by ISP?

• An ISP (internet service provider) is a company that provides individuals and organizations access to the internet and other related services.
• An ISP has the equipment and the telecommunication line access required to have a point of presence on the internet for the geographic area served.

What is ISP and examples?

• The definition of an ISP is defined as an Internet Service Provider which is a company providing Internet access.
• An example of an ISP is the company AT&T.

What is the role of ISPs?

• Internet service provider (ISP), company that provides Internet connections and services to individuals and organizations.
• ISPs may also provide software packages (such as browsers), e-mail accounts, and a personal website or home page.
• ISPs can host websites for businesses and can also build the websites themselves.

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