By Chris Lewis
"This is a invaluable reference that no networking seasoned might be with no! this could were within the field from CISCO."--Jerry Curtis, employees author, Aroostook home windows NT consumer team. up-to-date and extended to incorporate the most recent details on imposing TCP/IP over Cisco routers, this sought-after reference offers simply what Cisco documentation doesn't--crystal-clear, step by step directions for each element of working TCP/IP at the world's hottest routers. protecting the all-important web protocol (increasingly utilized in neighborhood applications), the CISCO TCP/IP: Routing specialist Reference offers functional, just-in-time services on designing for, configuring, and troubleshooting Cisco routers for fast-expanding
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The key point to understand is that network numbers are not understood at this layer; the addresses used at the Network Access layer have significance only for the network segment on which the packet is transmitted. The addresses at the Network Access layer do not traverse a router. Unlike the other layers in the DoD model, the Network Access layer must know the details of the underlying network so that packets can be formed correctly and sent across the physical network in place. The functions performed at this layer include forming network packets and using MAC addresses to deliver packets on a network segment.
Alternatively, we can change an existing configuration using the configureterminal command. Configuring a Router Using Setup. This first example of configuring a router assumes that you are attaching a terminal to your router and configuring it for the first time. 1: Configure Commands Command Description configure terminal Executes configuration commands from the terminal. Use this command to make changes to the configuration file from the console port or a telnet session. Once changes are entered press
A gateway or router (however one refers to it) is responsible for routing packets between different physical networks. , a packet circulating between routers and never reaching a destination) does not stay in the internetwork forever. Each time a packet travels through a router, its Time To Live field is reduced by one. If this value reaches zero, a router will discard the packet. Different routing protocols have different initial values for the Time To Live field. The initial value for the TTL field is usually 255.