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The Internet Hierarchical Model

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My proposal for your network will include hardware by Cisco, the leading manufacturer when it comes to networking equipment. My goal is to follow the Cisco 3 layer Hierarchical Model. This model of building a network gives better network performance with greater management, allows for scalability for future growth, and helps keep the network reliable by having redundancy for times when equipment needs to be serviced or goes down. This method also keeps the overall costs of building the network low. There are three layers involved called the core, the distribution, and the access layers. The top or first layer is the core layer and is used to move traffic at very high speeds and is considered the backbone of the network. It is also the layer…show more content…
I would highly recommend the use of NAT. I would like to use private IP addresses on the network because they cannot connect to the internet. Private IP addressing is used to keep everything contained within a network. This adds another layer of security as these are not routable over the internet. This will be a problem, though, if a host needs to use the internet to connect to outside sources. NAT is a way for private IP address that are within a network to be translated into public IP addresses so that they can be routed out onto the internet. It is a protocol that runs on a router that is connected directly to the internet. The router acts as a middleman in this case, allowing an entire private network to use a single ISP (internet service provider) line to connect to the public internet. It translates private IP addresses to routable public IP addresses before sending it out to the internet. It also takes a public IP address that comes in and changes it to the private IP address, sending it where it needs to go. Because you are connected to a single line, I will be using overload NAT with PAT (Port Address Translation). It translates many inside address to a single public IP address using the hosts port number (Network Address Translation (NAT)…show more content…
A VLAN (Virtual Local Area Network) is a virtual network of devices that can only communicate with other members of the same VLAN. They are helpful in grouping hosts together and help in implementing security on the network. There are four areas that will be on VLAN’s in the network. Sales will be on VLAN 10, engineering will be on VLAN 20, accounting will be on VLAN 30, and the executive offices will be on VLAN 40. They will still be able to communicate with other areas when needed by sending the packet through the routers on the distribution layer. An example is VLAN 40 and the local DNS server, while on the same switch, cannot communicate with each other. The packet will go up to the router in the distribution layer, then back down to the switch to reach its destination. To keep the sales department from being able to access the accounting department, an ACL (Access Control List) will be used. To make it simple to understand, I will use a named extended ACL. The name of this ACL will be no sales. An extended ACL will block any IP addresses from sales being passed to accounting. This will be put on the outgoing port on the router on the distribution layer before it is sent to the switch on the access layer. Any IP address of 172.16.1.x will be dropped from the
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