CISCO CCNA 3: chapter 3

1.

Refer to the exhibit. The network administrator has just added
VLAN 50 to Switch1 and Switch2 and assigned hosts on the
IP addresses of the VLAN in the 10.1.50.0/24 subnet range.
Computer A can communicate with computer B, but not with
computer C or computer D. What is the most likely cause of this
problem?

-There is a native VLAN mismatch.
-The link between Switch1 and Switch2 is up but not trunked.
-The router is not properly configured for inter-VLAN routing.
-VLAN 50 is not allowed to entering the trunk between Switch1
and Switch2.

correct: 4

2.

Refer to the exhibit. The exhibited configurations do not
allow the switches to form a trunk. What is the most likely
cause of this problem?

-Cisco switches only support the ISL trunking protocol.
-The trunk cannot be negotiated with both ends set to auto.
-By default, Switch1 will only allow VLAN 5 across the link.
-A common native VLAN should have been configured
on the switches.

correct: 2

3.

Refer to the exhibit. Which two conclusions can be drawn
regarding the switch that produced the output shown?
(Choose two.)

-The network administrator configured VLANs 1002-1005.
-The VLANs are in the active state and are in the process
of negotiating configuration parameters.
-A FDDI trunk has been configured on this switch.
-The command switchport access vlan 20 was entered
in interface configuration mode for Fast Ethernet
interface 0/1.
-Devices attached to ports fa0/5 through fa0/8 cannot
communicate with devices attached to ports fa0/9
through fa0/12 without the use of a Layer 3 device.

correct: 4,5

4. What statements describe how hosts on VLANs communicate?
-Hosts on different VLANs use VTP to negotiate a trunk.
-Hosts on different VLANs communicate through routers.
-Hosts on different VLANs should be in the same IP network.
-Hosts on different VLANs examine VLAN ID in the frame
tagging to determine if the frame for their network.

correct: 2

5. Switch port fa0/1 was manually configured as a trunk,
but now it will be used to connect a host to the network.
How should the network administrator reconfigure switch
port Fa0/1?

-Disable DTP.
-Delete any VLANs currently being trunked through port Fa0/1.
-Administratively shut down and re-enable the interface
to return it to default.
-Enter the switchport mode access command in interface
configuration mode.

correct: 4

6.

Refer to the exhibit. SW1 and SW2 are new switches being
installed in the topology shown in the exhibit. Interface Fa0/1
on switch SW1 has been configured with trunk mode “on”.
Which statement is true about forming a trunk link between
the switches SW1 and SW2?

-Interface Fa0/2 on switch SW2 will negotiate to become a trunk
link if it supports DTP.
-Interface Fa0/2 on switch SW2 can only become a trunk link
if statically configured as a trunk.
-Interface Fa0/1 converts the neighboring link on the adjacent
switch into a trunk link if the neighboring interface
is configured in nonegotiate mode.
-Interface Fa0/1 converts the neighboring link on the adjacent
switch into a trunk link automatically with no consideration
of the configuration on the neighboring interface.

correct: 1

7. The network administrator wants to separate hosts
in Building A into two VLANs numbered 20 and 30. Which
two statements are true concerning VLAN configuration?
(Choose two.)

-The VLANs may be named.
-VLAN information is saved in the startup configuration.
-Non-default VLANs created manually must use the extended
range VLAN numbers.
-The network administrator may create the VLANs in either
global configuration mode or VLAN database mode.
-Both VLANs may be named BUILDING_A to distinguish them
from other VLANs in different geographical locations.

correct: 1,4

8. What is a valid consideration for planning VLAN traffic
across multiple switches?

-Configuring interswitch connections as trunks will cause
all hosts on any VLAN to receive broadcasts from the other VLANs.
-A trunk connection is affected by broadcast storms on
any particular VLAN that is carried by that trunk.
-Restricting trunk connections between switches to a single
VLAN will improve efficiency of port usage.
-Carrying all required VLANs on a single access port will
ensure proper traffic separation.

correct: 2

9. What are two characteristics of VLAN1 in a default switch
configuration? (Choose two.)

-VLAN1 should renamed.
-VLAN 1 is the management VLAN.
-All switch ports are members of VLAN1.
-Only switch port 0/1 is assigned to VLAN1.
-Links between switches must be members of VLAN1.

correct: 2,3

10.

Refer to the exhibit. Which statement is true concerning
interface Fa0/5?

-The default native VLAN is being used.
-The trunking mode is set to auto.
-Trunking can occur with non-Cisco switches.
-VLAN information about the interface encapsulates the Ethernet
frames.

correct: 3

11. What statement about the 802.1q trunking protocol is true?
-802.1q is Cisco proprietary.
-802.1q frames are mapped to VLANs by MAC address.
-802.1q does NOT require the FCS of the original frame
to be recalculated.
-802.1q will not perform operations on frames that are
forwarded out access ports.

correct: 4

12. What is the effect of the switchport mode dynamic desirable
command?

-DTP cannot negotiate the trunk since the native VLAN is not
the default VLAN.
-The remote connected interface cannot negotiate a trunk unless
it is also configured as dynamic desirable.
-The connected devices dynamically determine when data
for multiple VLANs must be transmitted across the link
and bring the trunk up as needed.
-A trunk link is formed if the remote connected device is
configured with theswitchport mode dynamic auto or switchport
mode trunk commands.

correct: 4

13. A network administrator is removing several VLANs from
a switch. When the administrator enters the no vlan 1 command,
an error is received. Why did this command generate an error?

-VLAN 1 can never be deleted.
-VLAN 1 can only be deleted by deleting the vlan.dat file.
-VLAN 1 can not be deleted until all ports have been removed
from it.
-VLAN 1 can not be deleted until another VLAN has been assigned
its responsibilities.

correct: 1

14.

Refer to the exhibit. Company HR is adding PC4, a specialized
application workstation, to a new company office. The company
will add a switch, S3, connected via a trunk link to S2,
another switch. For security reasons the new PC will reside
in the HR VLAN, VLAN 10. The new office will use
the 172.17.11.0/24 subnet. After installation, users on PC1
are unable to access shares on PC4. What is the likely cause?

-The switch to switch connection must be configured as an access
port to permit access to VLAN 10 on S3.
-The new PC is on a different subnet so Fa0/2 on S3 must
be configured as a trunk port.
-PC4 must use the same subnet as PC1.
-A single VLAN cannot span multiple switches.

correct: 3

15.

Refer to the exhibit. Computer 1 sends a frame to computer 4.
On which links along the path between computer 1 and computer 4
will a VLAN ID tag be included with the frame?

A
A, B
A, B, D, G
A, D, F
C, E
C, E, F

correct: 5

16.

Refer to the exhibit. Computer B is unable to communicate with
computer D. What is the most likely cause of this problem?

-The link between the switches is up but not trunked.
-VLAN 3 is not an allowed VLAN to enter the trunk between
the switches.
-The router is not properly configured to route traffic
between the VLANs.
-Computer D does not have a proper address for the VLAN 3
address space.

correct; 4

17. What happens to the member ports of a VLAN when the VLAN
is deleted?

-The ports cannot communicate with other ports.
-The ports default back to the management VLAN.
-The ports automatically become a part of VLAN1.
-The ports remain a part of that VLAN until the switch
is rebooted. They then become members of the management VLAN.

correct; 1

18. Which two statements describe the benefits of VLANs?
(Choose two.)

-VLANs improve network performance by regulating flow control
and window size.
-VLANs enable switches to route packets to remote networks
via VLAN ID filtering.
-VLANs reduce network cost by reducing the number of physical
ports required on switches.
-VLANs improve network security by isolating users that have
access to sensitive data and applications.
-VLANs divide a network into smaller logical networks,
resulting in lower susceptibility to broadcast storms.

correct; 4,5

19. What switch port modes will allow a switch to successfully
form a trunking link if the neighboring switch port is in
“dynamic desirable” mode?

-dynamic desirable mode
-on or dynamic desirable mode
-on, auto, or dynamic desirable mode
-on, auto, dynamic desirable, or nonegotiate mode

correct: 3

20. What must the network administrator do to remove Fast
Ethernet port fa0/1 from VLAN 2 and assign it to VLAN 3?

-Enter the no vlan 2 and the vlan 3 commands in global
configuration mode.
-Enter the switchport access vlan 3 command in interface
configuration mode.
-Enter the switchport trunk native vlan 3 command
in interface configuration mode.
-Enter the no shutdown in interface configuration mode
to return it to the default configuration and then configure
the port for VLAN 3.

correct; 2

21.

Refer to the exhibit. How far is a broadcast frame that is sent
by computer A propagated in the LAN domain?

-none of the computers will receive the broadcast frame
-computer A, computer B, computer C
-computer A, computer D, computer G
-computer B, computer C
-computer D, computer G
-computer A, computer B, computer C, computer D, computer E,
computer F, computer G, computer H, computer I

correct: 4

Advertisements

One thought on “CISCO CCNA 3: chapter 3

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s