CCNA

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