1. © 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—4-1 Module Summary  Cisco routers operate at Layer 3, and their function is path determination.  Binary numbers are based on the “powers of 2.”  IP addressing: –Dotted decimal representation of a binary string –Identifies the network, subnet, and host  Routers have a startup process where they test the hardware and load the operating system and configuration.

2. © 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—4-2 Module Summary (Cont.)  Basic router configuration is usually done through the console port using CLI and consists of the host address and interface IP addressing.  Routers have hardware, environmental, electrical, and maintenance-related security threats similar to switches.  Basic router security consists of a login banner and Telnet and SSH.

3. © 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—4-3 Module Summary (Cont.)  The Cisco IOS DHCP server is a full DHCP server that can be configured using Cisco SDM.  Cisco IOS commands provide a set of tools for remote accessing and testing, as follows: –Telnet –SSH –ping –traceroute

4. © 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—4-4