Question

1. What is the difference between Private, Public, Community, and Hybrid Clouds. Give a practical example of each.
2. Be able to explain trunking and how it relates to VLAN communication
3. Know how VLANs work, and why we use them in modern computer networks

Answer 1

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Public Clouds

In a public cloud, individual businesses share on premise and access to basic computer infrastructure (servers, storage, networks, development platforms etc.) provided by a CSP. Each company shares the CSP’s infrastructure with the other companies that have subscribed to the cloud. Payment is usually pay-as-you-go with no minimum time requirements. Some CSPs derive revenue from advertising and offer free public clouds.

Public clouds are usually based on massive hardware installations distributed in locations throughout the country or across the globe. Their size enables economies of scale that permit maximum scalability to meet requirements as a company’s needs expand or contract, maximum flexibility to meet surges in demand in real time, and maximum reliability in case of hardware failures.

Public clouds are well suited for hosting development platforms or web browsers, for big data processing that places heavy demands on computer resources, and for companies that do not have advanced security concerns.

Private Clouds

In a private cloud, a business has access to infrastructure in the cloud that is not shared with anyone else. The business typically deploys its own platforms and software applications on the cloud infrastructure. The business’s infrastructure usually lies behind a firewall that is accessed through the company intranet over encrypted connections. Payment is often based on a fee-per-unit-time model.

Hybrid Cloud

In a hybrid cloud, a company’s cloud deployment is split between public and private cloud infrastructure. Sensitive data remains within the private cloud where high security standards can be maintained. Operations that do not make use of sensitive data are carried out in the public cloud where infrastructure can scale to meet demands and costs are reduced.

Hybrid clouds are well suited to carrying out big data operations on non-sensitive data in the public cloud while keeping sensitive data protected in the private cloud. Hybrid clouds also give companies the option of running their public-facing applications or their capacity intensive development platforms in the public portion of the cloud while their sensitive data remains protected.

A trunk port is a port that is assigned to carry traffic for all the VLANs that are accessible by a specific switch, a process known as trunking. Trunk ports mark frames with unique identifying tags – either 802.1Q tags or Inter-Switch Link (ISL) tags – as they move between switches. Therefore, every single frame can be directed to its designated VLAN.

An Ethernet interface can either function as a trunk port or as an access port, but not both at the same time. A trunk port is capable of having more than one VLAN set up on the interface. As a result, it is able to carry traffic for numerous VLANs at the same time.

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