Ccna 640-802 Dumps

QUESTION 382
A Certifyme router boots to the prompt shown in the exhibit below. What does this signify, and how should the
network administrator respond?
A. This prompt signifies that the configuration file was not found in flash memory. The network administrator
should use TFTP to transfer a configuration file to the router.
B. This prompt signifies that the IOS image in flash memory is invalid or corrupt. The network administrator
should use TFTP to transfer an IOS image to the router.
C. This prompt signifies that the configuration file was not found in NVRAM. The network administrator should
follow the prompts to enter a basic configuration.
D. This prompt signifies that the router could not authenticate the user. The network administrator should
modify the IOS image and reboot the router.

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
The default boot sequence for Cisco IOS software:
1. NVRAM 2. Flash (sequential) 3. TFTP server (network boot) 4. ROM (partial IOS)
If a router boots up in ROM mode as shown in this example, it means that the router was unsuccessfully able
to find a valid IOS to boot from, and a valid IOS image will need to be loaded onto it.

QUESTION 383
A Certifyme router boots up in ROMMON mode. What is ROM Monitor (ROMMON)?
A. A memory component for storing the saved configuration file
B. A memory management tool
C. An operating system used for hardware troubleshooting and for password recovery
D. Temporary storage space for the router operating files
E. The source of the primary Cisco IOS software image
F. None of the above

Answer: C

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
The ROM Monitor is a very limited code set that enables you to perform elementary functions to manually get
the router or switch back to a functioning state. You can perform low-level diagnostics and even copy a new
IOS file to the Cisco device over the console port. It is also used after the break sequence is issued during
bootup for password recovery use.
Section 3: Select the appropriate media, cables, ports, and
connectors to connect routers to other network devices and hosts (6 questions)

QUESTION 384
Which type of cable should be used to make a connection between the Fa0/0 port on a router and the Fa0/0
port switch?
A. Rollover cable
B. Console cable
C. Crossover cable
D. Straight-through cable
E. Serial cable

Answer: D

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Straight-through cables are used to connect host to switch (or hub) and router to switch (or hub).

QUESTION 379
What is the default configuration register setting on most Cisco routers?
A. 0×2104
B. 0×2012
C. 0×2210
D. 0×2102
E. 0×2142
F. None of the above

Answer: D

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
About 99 percent of the time someone uses a config-register, it’s more than likely because of a lost router
password. Normally, the two config-registers for recovering passwords are 0×2102 and 0×2142.
The first config-register, 0×2102, is the normal config-register if you boot the router from internal Flash. You
can see this config-register by using the show version command.
In this output, you’ll notice the last line says, “Configuration register is 0×2102.” This is normal.

QUESTION 380
During the boot sequence, a Certifyme 2800 series router needs to locate and load an operating system. What
is the default order the router uses to find an operating system?
A. ROM, TFTP server, Flash
B. Flash, TFTP server, ROM
C. Flash, NVRAM, TFTP server
D. Flash, ROM, TFTP server
E. Flash, TFTP server, RAM

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Booting up the Router:
Cisco routers can boot Cisco IOS software from these locations:
1. Flash memory 2. TFTP server 3. ROM (not full Cisco IOS)
Multiple source options provide flexibility and fallback alternatives.
Reference: http://www.svrops.com/svrops/documents/ciscoboot.htm

QUESTION 381
What will a new Certifyme router do during startup if a configuration file is not located in NVRAM?
A. It will search for the configuration file in the locations specified by boot system commands.
B. It will search for the configuration file in flash and if no configuration file is found there, it will enter the setup
dialog.
C. It will search for the configuration file on a TFTP server and if no configuration file is found there, it will enter
the setup dialog.
D. It will search for the configuration file in flash and if no configuration file is found there, it will load a limited
configuration file from ROM.
E. It will search for the configuration file on a TFTP server and if no configuration file is found there, it will load
a limited configuration file from ROM.

Answer: C

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
When a router boots and is able to locate the IOS it begins to load the configuration file.
The configuration file, saved in NVRAM, is loaded into main memory and executed one line at a time. These
configuration commands start routing processes, supply addresses for interfaces, and set media
characteristics.
If no configuration file exists in NVRAM, the router attempts a network boot and sends a broadcast request for
the file on a TFTP server. If this is also not found, the operating system executes a question-driven initial
configuration routine called the system configuration dialog.

QUESTION 376
How can a Certifyme administrator determine if a router has been configured when it is first powered up?
A. A configured router prompts for a password
B. A configured router goes to the privileged mode prompt
C. An un configured router goes into the setup dialog
D. An un configured router goes to the enable mode prompt

Answer: C

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
If a non-configured router is started, then it goes into setup mode and ask for the minimum configuration
parameters (hostname, IP address to interfaces, enable password, etc). If the router is already configured it
boots by implementing the saved startup-config.

QUESTION 377
What will cause a Certifyme router to enter setup mode? (Choose two)
A. The configuration file is missing in NVRAM.
B. The configuration register is set to 0×2100.
C. Boot system commands are misconfigured in the running-configuration.
D. The setup command was issued from the privileged mode prompt.
E. The IOS is missing.
F. The IOS is corrupt.

Answer: AD

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
When router boots up, it checks the valid configuration into NVRAM and tries to load the configuration. If there
is not configuration router automatically goes into setup dialog.
From setup dialog, you able to configuration the basic configuration. As well you can run the setup command
manually from privileged mode using the setup command.

QUESTION 378
Refer to the graphic. A network associate is planning to copy a new IOS image into the Certifyme1 router. This
new image requires 8 MB of flash memory and 32 MB of RAM. How will the IOS proceed with the copy
process?
A. The new IOS will be copied into flash memory and the current image will remain.
B. IOS will issue an error message because flash memory is not large enough to hold the new image.
C. During the copy process, the current IOS image will be erased.
D. The current IOS image must be manually erased before IOS will allow the new image to be copied.

Answer: A

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
According to the output shown above, the existing IOS is 8760520 bytes (8M) and the total size of the flash on
this device is 24567K (24M). The new IOS only requires an additional 8 MB, so it will be copied on to the flash
directly and both images will reside on the flash. The existing IOS is only overwritten it there is insufficient
space to hold both.

QUESTION 373
Why might the Certifyme network administrator set the configuration register to 0×2142 on a 2600 series Cisco
router?
A. To boot the IOS from ROM
B. To reset the console password
C. To upload a new version of the configuration file
D. To upload a new version of the IOS
E. To allow a new memory upgrade to be recognized by the router

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
About 99 percent of the time someone uses a config-register, it’s more than likely because of a lost router
password. The two config-registers for recovering passwords are 0×2102 and 0×2142.
The first config-register, 0×2102, is the normal config-register if you boot the router from internal Flash. You
can see this config-register by using the show version command.
In this output, you’ll notice the last line says, “Configuration register is 0×2102.” This is normal.
But let’s say you forgot the router’s password. To recover this password (as long as it’s unencrypted), boot the
router and bypass the startup-config using config-register 0×2142; you should then be able to see the
password in the startup-config. You can use the same method for encrypted passwords, but you’ll need to
overwrite the original password with a new one. To change the configuration register, enter the following:
Router(config)# config-register 0×2142 This will instruct the router to bypass the configuration and boot up as if
it were a brand new router using factory default settings.

QUESTION 374

After making some network changes you power off and then power on your Cisco router named CM1. What
sequence of events occurs when CM1 is powered up?
A. Perform POST, locate configuration statements, apply configuration statements, locate Cisco IOS software,
and load Cisco IOS software.
B. Locate Cisco IOS software, load Cisco IOS software, locate configuration statements, apply configuration
statements, and perform POST.
C. Test software routines, POST, load configuration files, load Cisco IOS software, test Cisco IOS software.
D. Perform POST, locate Cisco IOS software, load the Cisco IOS software, locate configuration statements,
and apply configuration statements.
E. Load and test IOS, load configuration files, test software routines, POST.
F. None of the above

Answer: D

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Upon initial start up, Cisco routers perform the following steps in order:
1. The router performs a power-on self-test (POST) to discover and verify the hardware.
2. The router loads and runs bootstrap code from ROM.
3. The router finds the IOS or other software and loads it.
4. The router finds the configuration file and loads it into running config.

QUESTION 375
You are the network administrator at Certifyme. You need to perform password recovery on Router CM1. What
must you modify in the password recovery process? (Choose two.)
A. Configuration register
B. NVRAM
C. Boot flash
D. CMOS
E. Flash

Answer: AB

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Recovering a Lost Password This section describes how to recover a lost enable
password and how to enter a new enable secret password.
Password recovery consists of the following major processes:
Determining the Configuration Register Value 1. With this process, you determine the configuration of the
router, so that you may
restore the configuration after the password is recovered.
Resetting the Router 1. With this process, you reconfigure the router to its initial startup configuration. You
then display the enable password, if one is used.
Resetting the Password 1. If you are using an enable secret password, you enter a new password with this
process.
You then restore the router to its prior configuration.
Resetting the Configuration Register Value 1. If you are using an enable password, you use this process to
restore the router to its
prior configuration.

QUESTION 370
You are a senior network administrator at Certifyme, and while performing the password recovery procedure on
your 2500 series Cisco router, you type in the following command:
o/r 0×2142
What is the purpose of this command?
A. It is used to restart the router.
B. It is used to bypass the configuration in NVRAM.
C. It is used to enter ROM Monitor mode.
D. It is used to view the lost password.
E. It is used to save the changes to the configuration.

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Theo/r 0×2142 command changes the value of config-register to 2142 in a Cisco 2500 series router, so that the
Router ignores the NVRAM contents and reverts to the initial setup configuration mode when it boots.

QUESTION 371
Refer to the exhibit below. A Certifyme technician wants to upload a new IOS in the router while keeping the
existing IOS. What is the maximum size of an IOS file that could be loaded if the original IOS is also kept in
flash?
A. 4 MB
B. 5 MB
C. 8 MB
D. 3 MB
E. 7 MB
F. None of the above

Answer: A

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Based on the output provided, the total amount of flash memory available is 8388608 bytes (8 MB), but the
existing IOS is using up 3803056 bytes (3 MB), so in order to fit both IOS files into the flash the new image
must be no greater than the amount of available memory, which is 4585552 bytes (4 MB).

QUESTION 372
Refer to the diagram. What is the largest configuration file that can be stored on this router?
Exhibit:
A. 31369K bytes
B. 16384K bytes
C. 191K bytes
D. 114688K bytes
E. None of the above

Answer: C

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Non-Volatile Random Access Memory (NVRAM) is used as the storage location for the router’s startup
configuration file. After the router loads its IOS image, the settings found in the startup configuration are
applied. When changes are made to a router’s running configuration, they should always be saved to the
startup configuration (stored in NVRAM) or they will be lost when the router shuts down. Remember that the
running configuration is stored in RAM, which is erased when the router is powered down. On a Cisco 2500
series router, NVRAM is a relatively tiny 32KB in size. In this example, the file size is only 191K, so the config
file must not exceed this.

QUESTION 367
You have just purchased a brand new router and wish to have the router prompt you through the initial
configuration commands. Which router mode does this describe?
A. ROM Monitor mode
B. SETUP mode
C. Autoflash mode
D. RXBOOT mode
E. None of the above

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Setup mode is a convenient mode that walks you through the setup procedure by prompting you with specific
questions and options one by one.

QUESTION 368
After working all night and successfully configuring a Cisco router for the Certifyme network you save your
changes on the startup config, reboot the router, and go out for a cigarette. When you return, none of your
changes are active and the router boots to the initial configuration mode! Which of the choices below indicates
the source of your problem?
A. Hardware failure in NVRAM prevents the router from loading the config
B. Startup-config in flash is corrupt and cannot be analyzed
C. Router configuration-register set to bypass startup configuration
D. Startup-config in NVRAM is corrupt and cannot be analyzed
E. None of the above

Answer: C

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
The default configuration-register setting of 0×2102 loads the IOS from flash and the configuration from
NVRAM.
However, for password recovery, you can set the register to 0×2142 and the startup-config file in NVRAM will
be bypassed. The problem described here is that the config register was not changed back to 0×2102 before
the router was rebooted, so the active configuration is bypassed. Simply setting the config register back to
0×2102 will fix this problem.
Incorrect Answers:
A, B, D. All of these describe hardware or software errors. In the event that this is the problem, errors will be
generated and the router will fail to boot properly. In these cases, the router will not return to the initial startup
configuration.

QUESTION 369
While working in setup mode, a configuration line is typed incorrectly. What should you do to exit setup mode,
without executing or saving any of the mistakes you made?
A. Type exit at the setup dialog.
B. Type close at the setup dialog.
C. Press the Ctrl-C key combination.
D. Press the Ctrl-X key combination.
E. Issue the copy startup-config command.
F. Issue the ‘write e” command.
G. Issue the “write mem” command

Answer: C

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Here is the partial output from new router while it boots up:
At any point you may enter a question mark ‘?’ for help.
Refer to the ‘Getting Started’ Guide for additional help.
Use ctrl-c to abort configuration dialog at any prompt.
Incorrect Answers:
A. The Exit command can not be used during setup mode.
B. This is an invalid command E. This command is used to save the configuration stored on NVRAM to a
location.
F. This will have the effect of erasing the running configuration, and setting the router configuration back to the
factory default settings.
G. This is an old command that is still supported on the latest Cisco IOS. It is short for “write memory” and has
the same effect as the “copy running-config startup-config” command.

QUESTION 364
During startup, router CM1 displays the following error message:
boot: cannot open “flash:”
What will CM1 do next?
A. It will attempt to locate the configuration file from a TFTP server. If this fails, it will initiate the setup dialog.
B. It will attempt to locate the IOS from a TFTP server. If this fails, it will load a limited IOS from ROM.
C. It will attempt to locate the configuration file from a TFTP server. If this fails, it will load a limited
configuration from ROM.
D. Because of damaged flash memory, the router will fail the POST.
E. It will attempt to locate the IOS from a TFTP server. If this fails, it will initiate the setup dialog.
F. None of the above

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
The boot sequence of a Cisco router is shown below:
Booting up the router and locating the Cisco IOS
1. POST (power on self test) 2. Bootstrap code executed 3. Check Configuration Register value (NVRAM)
which can be modified using the config-register command
0 = ROM Monitor mode 1 = ROM IOS 2 – 15 = startup-config in NVRAM
4. Startup-config file: Check for boot system commands (NVRAM) If boot system commands in startup-config
a. Run boot system commands in order they appear in startup-config to locate the IOS b. [If boot system
commands fail, use default fallback sequence to locate the IOS (Flash, TFTP, ROM)?] If no boot system
commands in startup-config use the default fallback sequence in locating the IOS:
a. Flash (sequential)
b. TFTP server (netboot) c. ROM (partial IOS) or keep retrying TFTP depending upon router model
5. If IOS is loaded, but there is no startup-config file, the router will use the default fallback sequence for
locating the IOS and then it will enter setup mode or the setup dialogue.
6. If no IOS can be loaded, the router will get the partial IOS version from ROM
Reference: http://www.svrops.com/svrops/documents/ciscoboot.htm

QUESTION 365
After logging into a router and typing in a few show commands, you press the up arrow key. What will this do?
A. It will recall the previous command line
B. It will move the cursor one line up
C. It will redisplay the current command line
D. It will capitalize the command line
E. None of the above

Answer: A

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
The up arrow key is used to recall the previous command line entry. The commands that were entered
previously can be displayed by repeatedly pressing the up arrow key, or by entering the “show history”
command.

QUESTION 366
After working on a router, some problems arise and you wish to view the commands that you recently entered.
Which IOS command opens the history buffer and displays the most recently entered commands?
A. Show history
B. Show buffers
C. Show typed commands
D. Show terminal buffer
E. Show command
F. None of the above

Answer: A

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
The router will buffer previously entered commands. By default, the “show history” command will display the
previous ten commands that were entered. To see the contents of the buffer you enter the show history
command.
Incorrect Answers:
B. This command will show the memory buffer information C, D. These are invalid commands.

QUESTION 361
You work as a network technician at Certifyme.com. Study the exhibit carefully. For what reasons have this
Certifyme router loaded its IOS image from the location that is shown? (Choose two)
A. Certifyme3 defaulted to ROMMON mode and laded the IOS image from a TFTP server
B. Cisco Routers will first attempt to load an image from TFTP for management purpose
C. Ruouter1 has specific boot system commands that instruct it to load IOS from a TFTP server
D. Certifyme3 is acting as a TFTP server fro other routers
E. Certifyme3 can’t locate valid IOS image in flash memory

Answer: CE

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:

QUESTION 362
You work as a network technician at Certifyme.com. Study the exhibit carefully.
What will router CertifymeA do when it starts up next time?
A. start the limited IOS in ROM
B. start in ROM monitor mode
C. retrieve configuration information from the running-config file
D. look for startup instructions in NVRAM
E. load IOS from flash

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
RAM-Sometimes called DRAM for dynamic random-access memory, RAM is used by the router just as it is
used by any other computer: for working storage. The running or active configuration file is stored here.
ROM-This type of memory (read-only memory) stores a bootable IOS image, which typically is not used for
normal operation. ROM contains the code that is used to boot the router until the router knows where to get the
full IOS image or as a backup bootable image, in case there are problems.
Flash memory-Either an EEPROM or a PCMCIA card, Flash memory stores fully functional IOS images and is
the default location where the router gets its IOS at boot time. Flash memory also can be used to store any
other files, including configuration files.
NVRAM-Nonvolatile RAM stores the initial or startup configuration file.
IOS on a router uses a configuration file for the initial configuration at router startup and the active, running
configuration file. The startup configuration file is in NVRAM; the other file, which is in RAM, is the one that the
router uses during operation. When the router first comes up, the router copies the stored configuration file
from NVRAM into RAM, so the running and startup configuration files are identical at that point. Also, exterior
to the router, configuration files can be stored as ASCII text files anywhere using TFTP or FTP.
The boot process follows this basic litany:
1. The router performs a power-on self-test (POST) to discover and verify the hardware.
2. The router loads and runs bootstrap code from ROM.
3. The router finds the IOS or other software and loads it.
4. The router finds the configuration file and loads it into running config.
Two configuration tools tell the router what OS to load:
1. The configuration register 2. The boot system configuration command First, the configuration register tells
the router whether to use a full-featured IOS,ROMMON, or the limited-feature IOS, which also is called
RXBOOT mode. The configuration register is a 16-bit software register in the router, and its value is set using
the config-register global configuration command. (Some older routers had a hardware configuration register
with jumpers on the processor card, to set bits to a value of 0 or 1.) On most Cisco routers, the default
Configuration Register setting is hexadecimal 2102.
0×2102 : Default, which loads the IOS from Flash Memory 0×2100 : Boot the router in ROM Monitor Mode
0×2142: Boot the router bypassing the startup configuration

QUESTION 363
There are no boot system commands in the router configuration in NVRAM for router CM1. What is the fallback
sequence that the router CM1 will use to find an IOS during reload?
A. ROM, NVRAM, TFTP server
B. Flash, TFTP server, ROM
C. TFTP server, Flash, NVRAM
D. Flash, NVRAM, ROM
E. NVRAM, TFTP server, ROM
F. None of the above

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:

QUESTION 358
Router CM1 receives information about network 192.168.111.0/24 from multiple sources. What will CM1
consider the most reliable information about the path to that network?
A. An OSPF update for network 192.168.111.0/16
B. A static route to network 192168.1111.0/24
C. A Directly connected interface with an address of 192.168.1111.254/24
D. A RIP update for network 192.168.1111.0/24
E. A Default route with a next hop address of 192.168.1111.1
F. A static route to network 192.168.1111.0/24 with a local serial interface configured as the next hop
G. None of the above

Answer: C

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:

QUESTION 359
Router CM1 has just received a packet and needs to route it. What two actions must this router take in order to
route incoming packets? (Choose two)
A. Inspect the routing table to select the best path to the destination network addresses.
B. Validate sources of routing information.
C. Inspect the ARP table to verify a legitimate source MAC address for each packet.
D. Identify the destination network address of each packet.
E. Verify the receipt of routed packets by the next hop router.
F. Identify the source network address of each packet.

Answer: AD

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
The router decides how to forward an incoming packet by finding the routes that “match” the destination
address of the packet, and then forwarding it according to the most narrowly applicable one. A packet matches
a route in the following way: a packet has (among other things) a destination address in its header, a route
contains either a network or a host address, a network mask (netmask), and instructions on how to forward a
packet using the route. The packet matches the route if its destination address is part of the address subspace
defined by the network address or exactly matches the host address of the route. A route is more narrowly
applicable than another if the address subspace defined by its network address contains fewer actual
addresses than the other, which is indicated by the netmask. An entry with a host address, rather than a
network address, is the narrowest kind.

QUESTION 360
Part of the Certifyme network is shown below:
In this network, host CertifymeA has established communications with host CertifymeB for the first time. What
enabled router Certifyme2 to forward this traffic in the appropriate direction to reach the network to which host
CertifymeB is attached?
A. A default gateway
B. TCP/IP
C. A routing protocol
D. DHCP
E. A Layer 4 protocol
F. DNS
G. None of the above

Answer: C

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Routing is the process of selecting paths in a network along which to send data or physical traffic. In order for
routers to know how to forward traffic to the correct destinations located on other IP networks, a routing
protocol must be enabled, either via the use of a dynamic routing protocol such as RIP or EIGRP, or through
the use of static routes.
Section 2: Describe the operation of Cisco routers (including:
router bootup process, POST, router components) (23 questions)

QUESTION 355
You work as a network technician at a Certifyme office. After configuring two interfaces on the Certifyme3 router
as shown, you notice an error message. What should be done to fix this error?
A. The subnet mask of the serial interface on Certifyme3 should be changed to 255.255.255.0.
B. The subnet mask of the FastEthernet interface on Certifyme3 should be changed to 255.255.255.240.
C. The serial interface must be configured first.
D. The serial interface must use the address 192.168.1.2.
E. The address of the FastEthernet interface should be changed to 192.168.1.66.

Answer: B

Section: IMPLEMENT AN IP ADDRESSING SCHEME AND IP SERVICES TO MEET NETWORK
REQUIREMENTS IN A MEDIUM-SIZE ENTERPRISE BRANCH
Explanation/Reference:
Explanation:
Cisco routers will not allow you to configure two interfaces that belong to the same IP subnet. In this case, by
giving the serial 0/0 interface an IP address of 192.168.1.65, it would belong to this /28 subnet but it would also
belong to the 192.168.1.17/24 subnet.
You need to ensure that two interfaces are given IP addresses and subnet masks so that they belong to
different subnets, and given the options only the option of changing the mask of the FE interface to an /28 will
accomplish this.

QUESTION 356
The junior network support staff at Certifyme provided the diagram as a recommended configuration for the first
phase of a four-phase network expansion project. The entire network expansion will have over 1000 users on
14 network segments and has been allocated this IP address space:
192.168.1.1 through 192.168.5.255 192.168.100.1 through 198.168.100.255
There are three problems with this IP addressing design. What are they? (Choose three)
A. The broadcast domain in AREA 1 is too large for IP to function.
B. The AREA 3 IP address space is inadequate for the number of users.
C. AREA 2 could use a mask of /25 to conserve IP address space.
D. The router-to-router connection is wasting address space.
E. The network address space that is provided requires a single network-wide mask.
F. The AREA 1 IP address space is inadequate for the number of users.

Answer: CDF

Section: IMPLEMENT AN IP ADDRESSING SCHEME AND IP SERVICES TO MEET NETWORK
REQUIREMENTS IN A MEDIUM-SIZE ENTERPRISE BRANCH
Explanation/Reference:
Explanation:
C: Since there are only 60 users on this LAN, a /25 could be used as that will provide for up to 128 IP
addresses (126 usable). In fact, since there are only 60 users, a /26 could be used as that will provide for up to
62 usable IP addresses. However, this would not accommodate any kind of growth and could cause problems
in the future.
D: On point to point serial router links, a /30 is generally used as this will allow for only 2 usable IP addresses,
which is all that is needed. In this case, a /26 has been assigned.
F: In this area, there are 500 users, but a /24 will only provide for 254 usable IP addresses.
A /23 or larger will be needed to accommodate this many users.
Topic 4, CONFIGURE, VERIFY, AND
TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON CISCO DEVICES (225 questions)
Section 1: Describe basic routing concepts (including: packet forwarding, router lookup process) (4 questions)
Exam D

QUESTION 357
The following output was shown on router Certifyme3:
Refer to the output of the two show commands in the exhibit above. If the Certifyme network administrator tries
to ping host 10.1.8.55 from host 10.1.6.100, how will these ICMP packets be processed by Router Certifyme3?
A. The packets will be routed out the Fa0/0 interface
B. The packets will be discarded
C. The packets will be routed out the S0/0 interface
D. The packets will be routed out the S0/1 interface
E. None of the above

Answer: D

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference: