Cisco Security (One Off) by Kartik Bhatnagar

By Kartik Bhatnagar

Businesses this day depend upon quick and safe move of knowledge. even if the web has unlocked strong probabilities for conversation, it has additionally brought new threats. Cisco defense items are designed to guard small to medium-sized companies. They fulfill uncomplicated wishes equivalent to proscribing unauthorized entry, and supply complicated defense for merchant networks in addition to the company networks that they deal with. Cisco protection supplies the data to maximise the advantages of Cisco safety items, retain your community secure, and achieve a aggressive facet!

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This data is the basis for all future planning. If the contents of the database is modified, then it can affect the present as well as the future workings of the organization. Therefore, to undermine the effectiveness of an organization, hackers can either enter false data or modify the contents of the already existing data. Figure 1-6 illustrates how a hacker can intercept information in transit and change its contents. FIGURE 1-6 Modifying information To modify information, hackers can utilize the following two security lapses: Modifying Web sites DNS poisoning Page 17 Modifying Web Sites Unauthorized modifications to the contents of a Web site has become a widespread menace.

UDP is an unreliable, connectionless protocol that is also used for transferring data. UDP transmits data as a datagram, which means all data is transmitted as a single message. 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.

TCP Three-Way Handshake TCP uses a synchronization process to establish a reliable data transmission between two hosts. This process is known as the TCP three-way handshake. Before transmitting the actual data, TCP transmits three data packets, to ensure that the actual data would be transmitted without being lost. To avoid data loss, the two hosts need to synchronize their communications. This is done by synchronization of their Initial Sequence Number (ISN). The ISN ensures that no data packets are lost and that the data is transmitted sequentially.

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