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Testking cisco 642-055

Vendor: cisco
Exam Code: 642-055
Exam Name: ARSFE Advanced Routing and Switching for Field Engineers (Access Routing and LAN Switching )
cisco 642-055 value pack
642-055 Q & A with Explanations + 642-055 Study Guide + 642-055 Preparation Labs

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Question: 6
While setting up remote access for your network, you type in the “aaa new-model” configuration
line in your Cisco router. Which authentication methods have you disabled as a result of this
change? (Choose all that apply.)
A. RADIUS
B. RADIUS+
C. Extended TACACS (XTACACS)
D. TACACS
E. TACACS+
F. Kerberos
Answer: C, D
Explanation:
When you enable AAA, you can no longer access the commands to configure the older
deprecated protocols, TACACS or Extended TACACS. If you decided to use TACACS or
Extended TACACS in your security solution, do not enable AAA.
Question: 7
You have forgotten the password to a Catalyst switch and need to perform a password recovery.
What is the first step that should be taken to do this?
A. Reboot the switch using the reload command.
B. Reboot the switch using the restart command.
C. Set the configuration register to ignore the startup configuration.
D. Set the boot register to 0×42.
E. Power cycle the switch.
F. Type in “config-register”.
Answer: E
Explanation:
The switch must be manually turned off (or unplugged), and then turned back on (plugged back
in). Power cycling the switch is the only way to get into password recovery.
Reference:

http://www.cisco.com/warp/public/474/pswdrec_6000.html

Question: 8
Which of the following statement is true regarding clocking for a Cisco T1 interface?
A. The clock source command selects a source for the interface to clock received data.
By default, it is clock source loop-timed (specifies that the T1/E1 interface takes the clock from
the Tx (line) and uses it for Rx).
B. Routers are DTEs and NEVER supply clocking to T1/E1 line.
C. The clock source command specifies the location of the NTP server for timing.
D. The clock source selects a source for the interface to clock outgoing data.
The default is clock source line –Specifies that the T1/E1 link uses the recovered clock from
the line.
E. The clock source identifies the stratum level associated with the router T1/E1.
The default is Stratum 1.
Answer: D
Explanation:
Clocking can either be internal, looped, or line. The default is line, meaning that the router is
receiving clocking from the carrier network line.
Incorrect Answers:
C, E. These answers relate to NTP services, which are used for providing time stamping
information to the router and does not relate to clocking. Stratum levels provide a hierarchy to the
NTP source, with the highest level as 1.
Question: 9
On your Terminal Server you are seeing spurious signals on line 6 of an asynchronous port due
to contention issues. What command will fix this issue?
A. flowcontrol hardware
B. transport input none
C. no exec
D. exec-timeout 0 0
Answer: C
Explanation:
The “no exec” command is an optional command for reverse telnet configurations. Adding this
line lessons the likelihood of contention over the asynchronous port. An executive process exists
on all lines and buffer data to each other. At times, it can make it difficult to use a reverse telnet
session. The command “no exec” will fix this.
Incorrect Answers:
A. Console ports do not use flow control. If the terminal server is connecting to Cisco console
ports then the “Flowcontrol hardware” would have no bearing.
B. This will fundamentally cut off all telnet and reverse telnet traffic from the line.
D. This will disable the timeout value, but will not fix problems relating to spurious signals and
contention issues.
Question: 10
You want to prevent all telnet access to your Cisco router. In doing so, you type in the following:
line vty 0 4
no login
password cisco
Will this prevent all telnet access to the router as desired?
A. Yes. The “no login” command disables all telnet access, even though the password is cisco.
B. Yes. The VTY password is needed but not set, so all access will be denied.
C. No. The VTY password is cisco.
D. No. No password is needed for VTY access.
E. No. The password is login.
Answer: D
Explanation:
“No Login” will not prompt users for any initial login, allowing them to access the router without a
password.

Testking 642-055
Questions and Answers : 210 Q&As
Updated: 2008-11-25
Price: $125.99

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