1. Securing Access

2. Accessing Remote Devices Topics
Configuring console access
Securing the privileged exec mode
Telnet
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Purpose: This slide state the objectives
Emphasize: Discuss the objectives with the students.

3. Configuring console access
Console port
Where you connect from your computer to directly configure the router or switch.
Use rollover cable & DB9 connector
Open Hyperterminal or similar program
Establish serial connection settings In HyperTerminal – use defaults

4. Configuring console access
Router configuration – line con 0 password <password> login

5. Securing the privileged exec mode
Router configuration –
Router#config terminal
Router(config)#enable password <password>
(stores password in clear text)
Router(config)#enable secret <password>
(stores password securely encrypted)

6. Telnet
Router configuration – line vty 0 4 password <password> login

7. Using Telnet to Connect to Remote Devices
SwitchA
RouterA
RouterB
SwitchB S1 S0
RouterA#telnet
Trying Open
Catalyst 1900 Management Console
Copyright (c) Cisco Systems, Inc
All rights reserved.
Enterprise Edition Software
Ethernet Address:
PCA Number:
PCA Serial Number: FAA02359H8K
Model Number: WS-C1924-EN
System Serial Number: FAA0237X0FQ .
SwitchB>
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Purpose:
Emphasize: Another way to learn about a remote device is to connect to it. Telnet, a virtual terminal protocol that is part of the TCP/IP protocol suite, allows connections to remote hosts. By default, a router can have up to five simultaneous incoming Telnet sessions. With Cisco’s implementation of TCP/IP, you need not enter the connect or telnet command to establish a Telnet connection. If you prefer, you can just enter the learned host name, the router will resolve the hostname using DNS or a local host table. To end a Telnet session, use the exit or logout EXEC command.
These are alternate commands for the operations listed on the graphic:
Initiate a session:
Denver> connect paris
Denver> paris
Denver>
Resume a session (enter session number or name):
Denver> 1
Paris>
End a session:
Paris> exit
Note: The Cat 1900 can accept incoming telnet connections but can not initiate an outgoing telnet session.
Remote device

8. Viewing Telnet Connections
SwitchA
RouterA
RouterB
SwitchB S1 S0
RouterA#sh session
Conn Host Address Byte Idle Conn Name *
RouterA#sh user
Line User Host(s) Idle Location
* 0 con
11 vty idle
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Purpose:
Emphasize:
Note: This output was taken from a Line 11 = VTY 0.
You can send messages to one or all terminal lines. A common reason for doing this is to inform users of an impending shutdown. To send a message to other terminals, issue the following command:
send {line-number | *}
Syntax Description
line-number Specifies the line number to which the message will be sent.
* Indicates that the message will be sent to all lines.
The system prompts for the message, which can be up to 500 characters long. End the message by entering Ctrl-Z. Enter Ctrl-C to abort the command.

9. Suspending a Telnet Session
SwitchA
RouterA
RouterB
SwitchB S1 S0
RouterB#<Ctrl-Shift-6>x
RouterA#sh session
Conn Host Address Byte Idle Conn Name
RouterA#resume 1
RouterB#
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Purpose:
Emphasize: The key stoke sequence for Ctrl-Shift-6 and x.

10. Closing a Telnet Session
SwitchA
RouterA
RouterB
SwitchB S1 S0
RouterA#disconnect
Closing connection to [confirm]
RouterA#clear line 11
[confirm]
[OK]
Closing the current session opened by you to a remote device
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Purpose:
Emphasize:
Note: Disconnect without the session number disconnect that last active session.
Closing a session opened by a remote device to you