IP ADDRESSING

IP Addressing

Decimal Equivalents of Bit Patterns

IP Address Classes

Host Addresses

IP Addressing

private IP address

• InterNIC has reserved certain IP addresses as private addresses for use with internal web sites or intranets.

• Are meant for devices that reside behind a router.

• Private IP addresses are sometimes referred to as Non-Routable IP.

private IP address

• There are three blocks of private IP addresses:

– 10.0.0.0 through 10.255.255.255 – 172.16.0.0 through 172.31.255.255 – 192.168.0.0 through 192.168.255.255

– A CLI is used to enter commands.– Users type or paste entries in the

console command modes. – Enter key instructs device to parse

and execute the command.– Two primary EXEC modes are user

mode and privileged mode.– Command modes have distinctive

prompts.

Cisco IOS User Interface Functions

• There are two main EXEC modes for entering commands.

Cisco IOS Software EXEC Mode

Cisco IOS Software EXEC Mode (Cont.)

Global Configuration Mode

• Used to make global changes to the router.

– Router# configure terminal– Router(conf)#

Viewing the Configuration

(Automatic scrolling of long lines.)

Ctrl-A Move to the beginning of the command line.

Ctrl-E Move to the end of the command line.

Esc-B Move back one word.

Esc-F Move forward one word.

Ctrl-B Move back one character.

Ctrl-F Move forward one character.

Ctrl-D Delete a single character.

Router>$ value for customers, employees, and partners.

Enhanced Editing Commands (cont.)

Ctrl-P or Up Arrow Recalls last (previous) commands

Ctrl-N or Down Arrow Recalls more recent commands

show history Shows command buffer contents

history size line Sets the buffer size permanently

Router Command History

terminal history size lines Sets session command buffer size

show version Command

wg_ro_a#show versionCisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-JS-L), Version 12.0(3), RELEASE SOFTWARE (fc1)Copyright (c) 1986-1999 by cisco Systems, Inc.Compiled Mon 08-Feb-99 18:18 by phanguyeImage text-base: 0x03050C84, data-base: 0x00001000

ROM: System Bootstrap, Version 11.0(10c), SOFTWAREBOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE(fc1)

wg_ro_a uptime is 20 minutesSystem restarted by reloadSystem image file is "flash:c2500-js-l_120-3.bin"(output omitted)--More--

Configuration register is 0x2102

show running-config and show startup-config Commands

wg_ro_c#show startup-configUsing 1359 out of 32762 bytes!version 12.0!

-- More --

wg_ro_c#show running-configBuilding configuration...

Current configuration:!version 12.0!

-- More --

In NVRAMIn RAM

• Displays the current and saved configuration

Using Telnet to Connect to Remote Devices

• Telnet is a protocol that enables one computer to connect to another computer.

• This process is also referred to as remote login.

• The remote computer can be physically located in the

next room, the next town, or in another country.

Using the ping and trace Commands

• Tests the connectivity and path to a remote device

Router###ping 10.1.1.10

Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.1.1.10, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms

Router#trace 192.168.101.101

Type escape sequence to abort.Tracing the route to 192.168.101.101

1 p1r1 (192.168.1.49) 20 msec 16 msec 16 msec 2 p1r2 (192.168.1.18) 48 msec * 44 msecRouter#

Using Telnet to Connect to Remote Devices

Viewing Telnet Connections

Suspending and Resuminga Telnet Session

Closing a Telnet Session