Computer network security

Part B: VoIP Computer-to-Computer Voice over Internet Protocol (VoIP) is the process of taking analog signals, such as a human voice, and transmitting them over the Internet as digital data. Computer-to-computer VoIP is usually thought of as the simplest way to use VoIP, as it simply requires a computer with basic peripherals, an internet connection and can easily be used with popular software such as Skype. What devices are involved from transferring Alice’s voice to the sound that Bob receives…

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interface between the network layer (IP etc.) and the Data Link layer (Ethernet, Token Ring etc.) It’s the standard for the upper Data Link layer sublayer, also known as the Logical Link Control layer. It’s responsible for flow and error control. The Data Link layer wants to send some data over the network, 802.2 LLC helps make this possible. b. 802.3 – Ethernet 802.3 is the standard which Ethernet operates by. The original 802.3 standard is 10mbps. Commonly, Ethernet networks transmit data in…

routing tables of the routers. (routing loops, 2015). An example is when three routers are connected in a triangular pattern i.e. router A is connected to router B, router B is connected to router C and router C is connected to router A, when the network is converged, all three routers will have sent their routing tables to their neighbors. If router C goes down and router B tries to send a packet to C at the same time the router went down before it receives an updated table from router A, it…

environment, the network consists of routers, switches, and security appliances, such as firewalls. The environment also consists of important services to ensure the security, and stability of the network. The identity infrastructure is contained within Active Directory, which provides security, authentication, and authorization of identities (Training Solutions, 2014). The DHCP and DNS service are also provided to ensure reliable name resolution, and dynamic IP address assignment to the network…

of the highly sought profession in the technology industry. Knowing that hackers are highly intelligent people who derive pleasure in manipulating technology to do what they are not intended to, they can be very helpful in different industry where security important. As a typical hacker, you would want to know how technology work, and why they perform certain functions. Should you think like a “black hat”, “white hat”, or “grey hat” hacker? Honestly speaking, a typical hacker might be very good…

Officer Green will represent the best friend of fifteen years to Officer Johnny. Officer Johnny will represent himself, the police officer who is working an unauthorized security job with a firm. Officer Green and Officer Johnny are both assigned to work patrol on the midnight shift and have been together through thick and thin over the last fifteen years. In the scenario provided Officer Johnny is described as being a great police officer, who gives back to the community regularly. Officer…

that a lot of my settings had changed,” he says. A colleague and I were able to duplicate this lack of notification with a quick test: Venmo doesn’t alert you if your password or email credentials change from within the account. “There are basic security holes that you could drive a truck through,” Chris said. (Griswold, 2015) Chis continued to have trouble as he attempted to figure out how to contact Venmo and attempt to get his money back. He found that there is a $50 liability if the fraud is…

passwords and it’s easy for the IT departments to audit how these being used in the system. It reduces cost and increases productivity. 5. Why is it increasing most important for a CIO or IT executive who oversees geographically distributed enterprise networks to be business…

Aritra Chatterjee Assignment #9 – Design patterns Date: Nov. 11, 2017 Compare and contrast the use of Decorator and Strategy patterns in two practical scenarios Introduction Decorator pattern – “Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality” [1]. Decorators are transparent to the component they are decorating, that is, they allow augmenting the existing functionality of a component at…