Cisco TCP IP Routing Professional Reference by Chris Lewis

By Chris Lewis

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In addition to its modularity, the 1700 range supports all the regular IOS functions and delivers higher processing power than the ranges discussed so far, to cope with encryption and the like. The 1720 comes with the following fixed ports: a standard Ethernet port, which will automatically sense whether it is connected to a 10Mbit/sec or 100 Mbit/sec LAN and operate accordingly, a console port to which a terminal can be attached, and an AUX port, which can be used for asynchronous communications.

It is through this window that all exchange of meaningful information occurs between communication users. Examples includes Telnet and SMTP. Layer 3 : Host-to-Host Transport layer Provides end-to-end data delivery services. The protocols at this layer are TCP and UDP. Layer 2 : Internet layer Defines the datagram or frame format and handles routing data through an internetwork. Examples include IP and ICMP. Layer 1: Network Access layer Defines how to access a specific network topology such as Ethernet or Token-Ring.

These documents are online on various systems on the Internet, and are available to anyone. 2 shows the DoD’s four-layer model. You can see that the layers of the DoD model do not precisely match those of the OSI model. For example, in DoD terms IP is a layer 2 protocol, whereas in OSI terms it is a layer 3 protocol. Throughout the rest of this book, when a protocol function is referred to as belonging to a particular layer, it is the OSI layer definition that is used. Application Layer. Several protocols make up the Application layer of the TCP/IP suite.

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