By Florent Parent, Oliver Steudler
Handed the Cisco protection examination utilizing merely this booklet. Has simply the correct mix of concept, sponsored by means of reliable examples and factors.
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Additional resources for Managing Cisco Network Security
The granting of authorization is based on trust. The process granting access must trust the process that authenticated the identity. Attackers may attempt to get the password of an authorized user, hijack a Telnet session, or use social engineering to impersonate an authorized user and assume their access rights. Authentication is the key to ensuring that only authorized users are accessing controlled information. com 112_IpSec_01 11/6/00 7:32 PM Page 15 Introduction to IP Network Security • Chapter 1 Accounting Accounting is the recording of network activity and resource access attempts.
Each layer communicates with its corresponding layer on the other host. It does not worry about the parameters or formats used in the layers above or below it. Physically, a layer hands its data to the interface of the layer above or below on the same system. 4 illustrates how the layers communicate. The vertical arrows show the physical communication within a host and the horizontal arrows show the logical communication between peer layers on different hosts. As data is handed from the application, to transport, to Internet, and to the network, each protocol does its processing and prepends a header, encapsulating the protocol above it.
The network layer controls the network hardware, encapsulates and transmits outgoing packets, and accepts and demultiplexes incoming packets. It accepts IP packets from the Internet layer above. Security in TCP/IP The Internet provides no guarantee of privacy or integrity for data. Cryptography should be considered for private, valuable, or vulnerable data. Data is encrypted as it is transmitted, and decrypted as it is received. Most layers in the ISO model can be used to provide data integrity and confidentiality.