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Cisco Security (One Off) by Kartik Bhatnagar

By Kartik Bhatnagar

Businesses at the present time depend on fast and safe move of information. even though the web has unlocked strong probabilities for verbal exchange, it has additionally brought new threats. Cisco safeguard items are designed to guard small to medium-sized companies. They fulfill simple wishes similar to proscribing unauthorized entry, and supply complicated security for merchant networks in addition to the firm networks that they deal with. Cisco defense promises the data to maximise some great benefits of Cisco protection items, maintain your community secure, and achieve a aggressive part!

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Combined Effect of Internal and External Threats An organization faces the most serious threat when both internal and external security threats converge. For example, a disgruntled employee can easily give his username and password to an external entity. In such a situation, your organization is under fire from both sides—threats are present in the external as well as internal environments. Figure 1-3 illustrates how an organization can be attacked from both the internal and external environments.

In addition, it specifies the functions of upper layers, including network services, such as printer services, file services, and providing support for data encryption and formatting. Due to a variety of functions carried out by the Application layer, it supports a large number of protocols. The following protocols specifically exist at the Application layer: File Transfer Protocol (FTP). FTP is responsible for data transmission over a reliable connection. You use FTP to move, delete, or send files between an FTP server and client.

S. government to popularize Open System Interconnection (OSI) protocols, TCP/IP is still considered to be the real open system interconnection protocol. The reference model of TCP/IP defines standards for any developments in the field of TCP/IP. Figure 2-1 presents a comparative overview of the OSI and the TCP/IP reference models. Page 24 FIGURE 2-1 Comparing the OSI reference model and the TCP/IP model Similar to the OSI reference model, the TCP/IP reference model is also a set of layers, with each layer representing specific tasks and components of communication.

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