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‫So let's talk a little bit about the network and data link layer security.

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‫Why is it important and how can we classify the network layer attacks, et cetera?

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‫When Osai model was introduced, there is no thinking of any type of security.

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‫Security just wasn't part of the design of either the OSAI or TCP IP models.

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‫Further, while there may be osai layers, there are not necessarily protocols that correspond to them.

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‫See, OCI was built to allow different layers to work without knowledge of each other, so any compromise

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‫in lower levels directly affects the higher level.

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‫As a result, a system is as secure as its weakest link.

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‫In other words, security is as strong as the weakest link, right?

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‫So when it comes to networking, layer two is one of the weakest links.

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‫The protocols developed in the early years of the internet did not require a quality of service que

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‫os, for example, short delays in the protocols could be ignored.

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‫So the key principles of information security, CIA triad, confidentiality, integrity and availability

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‫were not integrated into the protocols or they are really weak so we can classify the network and data

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‫link layer attacks according to the effects of the attacks.

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‫Right.

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‫So these classes are denying the traffic between two hosts sniffing or listening to the traffic, compromising

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‫the transferred data and spoofing.