The document discusses the key differences between intranets, extranets, private networks, and public networks. It also summarizes the differences between SMTP and POP protocols, HTML and XML markup languages, and leased line versus private networks.

1. Difference Between Intranet and Extranet Intranet refers to a collection of networks within a logical body, such as a building, corporation or other entity. Intranet can be as simple as two computers connected at home to each other, or as vast as 1000 branch offices of a bank, connected via privately owned, non-public network links. Intranets usually have a firewall and router, which permits access to the public Internet, while protecting the internal Intranet from malicious users

2. Intranet vs. Extranet

4. Difference Public, Private Networks and Leased Line public network- consists of two services. It is important to understand the concept of switched and dedicated services since mistakes in configuring telephone networks could result in extra expense, insufficient capacity and increased maintenance. private network- is a network that uses private IP address space, following the standards set by RFC 1918 and RFC 4193 . These addresses are commonly used for home, office, and enterprise local area networks (LANs), when globally routable addresses are not mandatory, or are not available for the intended network applications. Private IP address spaces were originally defined in an effort to delay IPv4 address exhaustion , but they are also a feature of the next generation Internet Protocol , IPv6 . A leased line is a service contract between a provider and a customer, whereby the provider agrees to deliver a symmetric telecommunications line connecting two locations in exchange for a monthly rent (hence the term lease).

5. Lease Line Network

6. Private Network

7. Public Network

9. SMPT VS. POP

11. HTML VS XML

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