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Router Questions

May 14th, 2017 Go to comments

Question 1

Explanation

The following details the router boot process:
1. The router is powered on.
2. The router first runs Power-On Self Test (POST)
3. The bootstrap checks the Configuration Register value to specify where to load the IOS. By default (the default value of Configuration Register is 2102, in hexadecimal), the router first looks for “boot system” commands in startup-config file. If it finds these commands, it will run boot system commands in order they appear in startup-config to locate the IOS. If not, the IOS image is loaded from Flash . If the IOS is not found in Flash, the bootstrap can try to load the IOS from TFTP server or from ROM (mini-IOS).
4. After the IOS is found, it is loaded into RAM.
5. The IOS attempts to load the configuration file (startup-config) from NVRAM to RAM. If the startup-config is not found in NVRAM, the IOS attempts to load a configuration file from TFTP. If no TFTP server responds, the router enters Setup Mode (Initial Configuration Mode).

For more information about booting process please read our Cisco Router Boot Sequence tutorial.

Question 2

Explanation

Remember that only route interface can separate broadcast domain (while switch interface separate collision domain) so the broadcast domains are equal to the number of router interfaces, which is four in this case.

Question 3

Explanation

In short, when powered on the router needs to do:

1. Run POST to check hardware
2. Search for a valid IOS (the Operating System of the router)
3. Search for a configuration file (all the configurations applied to this router)

Question 4

Explanation

The “exec-timeout” command is used to configure the inactive session timeout on the console port or the virtual terminal. The syntax of this command is:

exec-timeout minutes [seconds]

Therefore we need to use the “exec-timeout 0 10” command to set the user inactivity timer to 10 seconds.

Question 5

Explanation

An example of the output of the “show ip interface loopback 0” is shown below.

show_ip_interface.jpg

Question 6

Explanation

When you turn the router on, it runs through the following boot process.

The Power-On Self Test (POST) checks the router’s hardware. When the POST completes successfully, the System OK LED indicator comes on.
The router checks the configuration register to identify where to load the IOS image from. A setting of 0×2102 means that the router will use information in the startup-config file to locate the IOS image. If the startup-config file is missing or does not specify a location, it will check the following locations for the IOS image:

1. Flash (the default location)
2. TFTP server
3. ROM (used if no other source is found)

The router loads the configuration file into RAM (which configures the router). The router can load a configuration file from:

+ NVRAM (startup-configuration file)
+ TFTP server
If a configuration file is not found, the router starts in setup mode.

Question 7

Explanation

The “show ip interface brief” command can be used to view a summary of the router interfaces. This command displays the IP address, interface status, and additional information. An example of the “show ip interface brief” command is shown below. We can see the interface status of E0/0 is “up/up”.

R3_show_ip_int_brief.jpg

Question 8

Explanation

By default, the Cisco IOS CLI has two privilege levels enabled, level 1 and level 15.
+ User EXEC mode (privilege level 1): provides the lowest EXEC mode user privileges and allows only user-level commands available at the Router> prompt.
+ Privileged EXEC mode (privilege level 15): includes all enable-level commands at the Router# prompt. Level 15 users can execute all commands and this is the most secured and powerful privilege level.

However, there are actually 16 privilege levels available on the CLI, from 0 to 15 and you can assign users to any of those levels. Zero-level access allows only five commands -logout, enable, disable, help, and exit. User level (level 1) provides very limited read-only access to the router, and privileged level (level 15) provides complete control over the router.

Question 9

Explanation

To reset the password we can type “confreg 0x2142” under rommon mode to set the configuration register to 2142 in hexadecimal (the prefix 0x means hexadecimal (base 16)). With this setting when that router reboots, it bypasses the startup-config.

Question 10

Question 11

Explanation

The “no logging console” turns off logging to the console connection (it is turned on by default) and it is often used if the console received large amount of logging output. But this command is not recommended in normal configuration -> A is not correct.

The command “logging host ip-address” instructs the device to send syslog messages to an external syslog server -> B is correct.

The “show logging | redirect flashioutput.txt” command will put the text file in the router flash memory because we did not specify a remote location (like tftp) -> D is not correct.

The command “snmp-server enable traps syslog” instructs the device to send syslog messages to your network management server as SNMP traps instead of syslog packets. This command itself does not enable debug output to a remote location -> E is not correct.

By default, Cisco IOS does not send log messages to a terminal session over IP, that is, telnet or SSH connections don’t get log messages. But notice that console connections on a serial cable do have logging enabled by default. The command “terminal monitor” helps logging messages appear on the your terminal. First we don’t think this is a correct answer but after reading the question again, we believe it is a suitable one as a Telnet/SSH session may be considered a “remote location” -> C is correct.

Question 12

Explanation

Other choices are surely incorrect so only “physical access” answer is the correct one. In order to recover a password on a Cisco router, the first thing you have to do is either switch off or shut down the router. For more information about this process, please read http://www.cisco.com/c/en/us/support/docs/routers/2800-series-integrated-services-routers/112033-c2900-password-recovery-00.html

Question 13

Explanation

During the copy process, the router asked “Erasing flash before copying? [confirm]” and the administrator confirmed (by pressing Enter) so the flash was deleted.

Note: In this case, the flash has enough space to copy a new IOS without deleting the current one. The current IOS is deleted just because the administrator wants to do so. If the flash does not have enough space you will see an error message like this:

%Error copying tftp://192.168.2.167/ c1600-k8sy-mz.l23-16a.bin (Not enough space on device)
Comments (10) Comments
  1. Mendira
    May 3rd, 2017

    Watched the complete Cisco CCNA 200-125 exam study training guide with each and every detail about 200-125 CCNA exam only on: https://www.youtube.com/watch?v=fg2uoWDHFeU

  2. davegi
    May 22nd, 2017

    why only paypal?

  3. Anonymous
    June 9th, 2017

    hi . the answer for question 12 is diffrent by the answer in quizz!!!!!!!! which one is correct ?

  4. Wonder
    June 13th, 2017

    Hi,
    Please let me know the correct ans for qn 12.

  5. Angelo
    June 13th, 2017
  6. Becky
    July 30th, 2017

    For Q8, Answer is A. Level 0 is most secured

  7. nickaro
    August 11th, 2017

    In Q.9 there are 2 possible correct answers:

    B. access router physically
    D. Type confreg 0x2142 at the rommon 1

    Though the first thing you must do to reset password is to access physically to the router.
    So, I think, answer B should be the correct one.

  8. Altaie
    August 13th, 2017

    Q12:

    in all cases, you are going to be required to access the router physically in order to reset the password, check this link:

    https://www.cisco.com/c/en/us/support/docs/routers/2800-series-integrated-services-routers/112033-c2900-password-recovery-00.html

    so the answer to this questions is (D) it requires a physical access to the router.

  9. IMRAN SHAHID
    August 28th, 2017

    For Question 7 , there are two options
    A) show ip int brief
    B) show interfaces

    both will tell you the status of the link plus the show interfaces will tell you more details, so both are good. Please comment.

    Thank you

    Imran Shahid

  10. Kelly
    September 12th, 2017

    Pls can someone send me CCNA Routing and switching latest dumps

    Email – kellysilver2015 @ yahoo dot com

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