Advantages Of Hierarchical Network Design

Chapter 1- Introduction
In this case study, the author will conduct a research about designing and implementing a network that can benefit the staffs of an organization. The author has been tasked to design a network for a headquarters organization which consists of 2000 hosts and 20 servers. The network should be available to all the staffs or personnel who work at the organization and outsiders such as customers, vendors and branches of the organization should also able to link to the headquarters network. Furthermore, the author needs to include security such as password for the hosts and the servers, to ensure authorized personnel or staff have the rights to access to the headquarters data. In order to design and implement the network,

Simplicity
The hierarchical network design model breaks down the problem of the network design into smaller parts, so that network designers will be able to manage the problems and it also helps them to identify the suitable hardware for a particular layer.

2. Security
The model also provide security of the data; the distribution and access layer utilize the Access List to filter the required traffic and discarding the non-required ones. The model also helps to prevent unauthorized access to the database.

3. Flexibility
This model is useful because it modularizes into layers to allow the network designers to make changes such as adding, replacing or removing any small parts of the network.

4. Cost Saving
The hierarchical network design model helps in preventing organization in spending money excessively on hardware such as routers, wireless access point, switches, hub or bridges or cables. The model actually reduces the number of the hardware for setting up a network by allocating those are needed only.

The form of an IPV6 address is different from IPV4 address. An IPV4 address uses dots to separate each of its sections, one example for this IP address is 172.15.251.1. IPV6 is uses a double colon to separate each of its sections, one of the examples is 2003:db8:ffff:1:203:03ff:fe03:0400. Notice that the notation of the IPV6 address is longer than that of the IPV4 address, however, it can be reduced by abiding to two rules.

The first rule states that any leading zeros in any 16-bit section (hextet) can be eliminated. For instance, 05BC can be reduced to 5BC or 00BC can be reduced to BC. This rule is not applicable to trailing zeroes. For instance, the hextet “DBA” could be either “0DBA” or “DBA0”. The second rule states that any single, bordering string of one or more 16-bit section having all zeroes can be replaced by a double colon (:) and it can be used only if it within an address. For instance, an incorrect address such as 2001:0AB7:: CDBA::3421, can be compressed into 2001: 0AB7:: CDBA:

5.2 Advantages and Disadvantages for