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QUESTION 101
Which of the following tasks are NOT functions performed by VTP switches? (Select all that apply)
A. To reduce parallel load sharing
B. To propagate global VLAN information
C. To provide routing randomness
D. To set the trunk priority levels of adjacent switches.
E. To ensure that there is a trunk operating in the network.
F. None of the above
Correct Answer: ACDE Section: (none) Explanation
Explanation/Reference:
Explanation: VTP is a Layer 2 messaging protocol that maintains VLAN configuration consistency by managing the addition, deletion, and renaming of VLANs within a VTP domain. A VTP domain (also called a VLAN management domain) is made up of one or more network devices that share the same VTP domain name
and that are interconnected with trunks.
VTP minimizes misconfigurations and configuration inconsistencies that can result in a
number of problems, such as duplicate VLAN names, incorrect VLAN-type specifications, and security
violations.
The fundamental function of VTP is to manage, maintain, and propagate VLAN information throughout the
enterprise network. All of the choices, besides B, describe functions that are not performed by VTP.
QUESTION 102
If you have just configured a Catalyst switch to operate in a VTP mode, and that switch is configured to NOT advertise VLAN configuration information. Which VTP mode has been configured on this switch?
A. Client
B. Server
C. Host
D. Transparent
E. Native
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation: You can configure a switch to operate in any one of these VTP modes: Server-In VTP server mode, you can create, modify, and delete VLANs and specify other configuration parameters (such as VTP version and VTP pruning) for the entire VTP domain. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on advertisements received over trunk links. VTP server is the default mode. Client-VTP clients behave the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client. Transparent-VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, in VTP version 2, transparent switches do forward VTP advertisements that they receive out their trunk ports.
QUESTION 103
SIMULATION
The Certkiller network is displayed in the diagram below:
You have just been hired by Certkiller .com to help their main office expand. The main offices have
enhanced their wiring closets with some Layer 3 switches. The new distribution layer switch has been
installed and a new access layer switch cabled next to it. Your task is to configure the distribution layer and
access layer switch with VTP to share VLAN information, then to configure inter-VLAN routing on the
distribution layer switch to route traffic between the different VLANs that are configured on the access layer
switches.
VTP Domain Distribution
VLAN Ids 20 31
IP Addresses 172.16.71.1/24 172.16.132.1/24
These are your specific tasks:
1.
Configure the VTP information with the distribution layer switch as the VTP server
2.
Configure the VTP information with the access layer switch as a VTP client
3.
Configure VLANs on the distribution layer switch
4.
Configure inter-VLAN routing on the distribution layer switch
5.
Specific VLAN port assignments will be made as users are added to the access layer switches in the future.
6.
All VLANs and VTP configurations are to completed in the global configuration To configure the switch click on the host icon that is connected to the switch be way of a serial console
cable.
LAB configuration: switch#conf t switch(config)#vtp mode server switch(config)#vtp domain CISCO switch(config)#vlan 20 switch(config)#vlan 31 switch(config)#int vlan 20 switch(if-config)#ip add 172.64.20.1 255.255.255.0 switch(if-config)#no shut switch(if-config)#int vlan 31
switch(if-config)#ip add 192.162.31.1 255.255.255.0 switch(if-config)#no shut switch(if-config)#exit switch#ip routing switch#sh run switch#copy run start switch#conf t switch(config)#vtp mode client vtp domain CISCO switch(config)#exit switch#show run switch#copy run start Alternative #1 VTP Domain Distribution VLAN Ids 20 31 IP Addresses 172.16.16.1/24 172.16.193.1/24 Alternative #12 VTP Domain Distribution VLAN Ids 30 21 IP Addresses 172.16.203.1/24 172.16.93.1/24
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
QUESTION 104
The following commands were entered on a Certkiller switch: Switch(config)# vtp mode transparent Switch (config)# vtp version 2 What is the result of these commands?
A. VLAN configuration information is saved in RAM only.
B. VLANs cannot be created, modified or deleted via command line interface.
C. VLAN configuration information received via VTP advertisements are forwarded to other switches within the management domain.
D. VLAN configuration information is synchronized with information within VTP advertisements received from other switches in the management domain.
Correct Answer: C Section: (none) Explanation Explanation/Reference:
Explanation: VTPv2 will allow the switch to be in transparent mode which will forward VTP info. The command series above put the switch in VTP transparent mode. This Certkiller switch does not actively participate in VTP, it doesn’t advertise its VLAN configuration to other switches, and when other switches advertise their VLAN configuration it doesn’t consider that information. It will, however, pass incoming VLAN information that was received to other switches within the VTP domain.
QUESTION 105
The Certkiller network is displayed in the diagram below:
The network in the above exhibit is configured with VLANs 1,2,3,4, & 5 and 802.1 Q. trunking is enabled between all switches. However, access ports for Certkiller 3 and Certkiller 6 are the only access ports for VLAN 3. What could an administrator do to make sure that other switches don’t receive unnecessary broadcast packets destined for VLAN 3, while still allowing all the other VLAN packets to cross?
A. Configure VTP pruning.
B. Configure Certkiller 3 and Certkiller 6 as transparent switches.
C. Configure Certkiller 1, Certkiller 2, Certkiller 4 and Certkiller 5 as transparent switches.
D. Nothing is required. Only Certkiller 3 and Certkiller 6 will receive VLAN3 packets by default.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation: VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic, such as broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network devices. By configuring VTP pruning, traffic will not flow to switches destined for VLANs that they are not attached to.
QUESTION 106
Switch CK1 is configured as a VTP server. What is true when you enable VTP pruning on a VTP server?
A. It is not possible without a root re-election
B. It enables pruning for the entire management domain.
C. It cannot be done on a VTP server
D. It enables pruning for the individual switch.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
Enabling VTP pruning on a VTP server enables pruning for the entire management domain. VTP pruning
takes effect several seconds after you enable it. By default, VLANs 2 through 1000 are pruning-eligible.
VTP pruning does not prune traffic from VLANs that are pruning-ineligible. VLAN 1 is always pruning-
ineligible; traffic from VLAN 1 cannot be pruned.
QUESTION 107
When setting up multiple VTP domains, what should be considered in order to maintain VLAN database consistency? (Select two)
A. Do not configure any switches as a VTP server
B. Ensure that all switches not authorized to make changes are in client mode
C. Always configure switches using VTP server mode when adding them to the existing network
D. Allow only one VTP server in each domain so that adding and deleting VLANs can be centralized to one location.
Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
Explanation:
B: Switches not authorized to make changes should be run as VTP clients. VTP clients receive information from VTP servers and send and receive updates, but they cannot make any changes.
D: You need at least one server in your VTP domain to propagate VLAN information throughout the domain. You are able to use several VTP servers in a domain. However, only allowing one VTP server would help keep the VLAN database consistent. Incorrect Answers:
A: Switches can very well be used as VTP servers. VTP server mode is the default for all Catalyst switches.
C: It is more prudent to configure switches using VTP client mode. They will not be able to update information in the VLAN domain database.
QUESTION 108
VTP is running on the Certkiller network. In which VTP modes can a full list of all VLANs be maintained? (Select two)
A. VTP Bypass
B. VTP Client
C. VTP Transparent
D. VTP Restore
E. VTP Server
Correct Answer: BE Section: (none) Explanation
Explanation/Reference:
Explanation:
VTP-capable devices can be configured to operate in the following three modes: The VTP Server
maintains a full list of all VLANs within the VTP domain. Information is stored in nonvolatile random-access
memory (NVRAM). The server can add, delete, and rename VLANs.
The VTP Client also maintains a full list of all VLANs. However, it will not store in NVRAM. The client can
not add, delete, or rename VLANs. Any changes made must be received from a VTP server
advertisement.
The VTP Transparent mode does not participate in VTP. However, it will pass on a VTP advertisement.
VLAN, as defined, is only local to the switch and is stored in NVRAM.
QUESTION 109
You wish to configure VTP on switch CK1 . What do you have to do before you can create a VLAN on a VTP server?
A. The VTP server ID must be cleared
B. The VTP membership list must be refreshed
C. The priority must be cleared
D. The management domain name must be specified
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation: By default, the switch is in VTP server mode and is in the no-management domain state until the switch receives an advertisement for a domain over a trunk link or you configure a management domain. You cannot create or modify VLANs on a VTP server until the management domain name is specified or learned.
QUESTION 110
What must you do if you wish to configure VTP in secure mode within the Certkiller LAN?
A. Assign a management domain password to the VTP Server in the domain.
B. Assign a management domain password to each switch in the domain.
C. Assign a management domain password to the root switch in the domain.
D. None of the above.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
If you configure VTP in secure mode, the management domain will not function properly if you do not
assign a management domain password to each switch in the domain. All switches must be configured
with the password in order for VTP to function properly in a network.
QUESTION 111
If you configure a switch as a VTP server offline, then connect it to a network, what
could happen to the network?
A. Cause a loss of VLAN information
B. Destabilize the spanning tree
C. Revert to simplex mode
D. Revert to duplex mode
E. Ignore the configuration revision numbers created on the other VTP servers
F. Revert to client mode
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation: When connecting a new switch to your network you can accidentally change your current VLAN database if the new switch has a higher VLAN Trunking Protocol (VTP) revision number. If the newly inserted switch has no VLANs configured and the revision number is higher and is configured as a VTP server, it will override the configuration of the other switches within the network, deleting all of the configured VLANs. To avoid this, you must clear the VTP revision number on the new switch. The easiest way is to change the VTP domain name to “something_else” and back to “your_VTP_domain” on the new switch. This sets the VTP revision number to 0 and you can connect the switch to the network without any problem.
QUESTION 112
Which of the following are true if you configure a password for VTP? (Select all that apply)
A. It is carried in all summary-advertisement VTP packets
B. It needs to be the same on all switches in the VTP domain
C. It needs to be configured on all switches in the VTP domain
D. It is translated using an algorithm in a 24 bytes word E. None of the above
Correct Answer: ABC Section: (none) Explanation
Explanation/Reference:
Explanation: According to the online documentation provided by Cisco: If you configure a password for VTP, it needs to be configured on all switches in the VTP domain and it needs to be the same password. The VTP password you configure is translated using an algorithm in a 16 bytes word (MD5 value) carried in all summary-advertisement VTP packets. Incorrect Answers:
D: The algorithm uses a 16 byte word, not 24 bytes.
QUESTION 113
Is the following statement True or False?
With VTP, if the Certkiller administrator makes VLAN configuration changes
centrally on one or more switches, those changes will be automatically communicated to all the other
switches on the network.
A. There is not enough information to determine
B. True
C. False
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: This statement is true. Before you create virtual LANs (VLANs), you must decide whether to use VTP in your network. With VTP, you can make configuration changes centrally on one or more switches and those changes are automatically communicated to all the other switches in the network. Changes made to VTP servers are propagated to all other switches within the VTP domain.
QUESTION 114
You have to enter a new switch into the existing Certkiller VTP domain without altering the configurations of the systems currently on this domain. Which of the following answer choices describes one of the conditions required to ensure that the new switch will not change the existing VTP domain configuration?
A. The switch must be in client mode.
B. The switch must be in a mode other than the client mode.
C. The VTP domain must not have a password assigned to it.
D. The trunk links must not be configured for ISL
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation: You can configure a switch to operate in any one of these VTP modes: Server-In VTP server mode, you can create, modify, and delete VLANs and specify other configuration parameters (such as VTP version and VTP pruning) for the entire VTP domain. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on advertisements received over trunk links. VTP server is the default mode. Client-VTP clients behave the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client.
Transparent-VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, in VTP version 2, transparent switches do forward VTP advertisements that they receive out their trunk ports. Only by using the client or transparent modes can you ensure that the other switches within the domain are left unaffected.
QUESTION 115
What method could you use to eliminate unicast and broadcast traffic that is flooded to a VLAN unnecessarily?
A. VTP pruning
B. MLS-SE
C. VTP trunking
D. VTP compression
E. All of the above
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation:
VTP ensures that all switches in the VTP domain are aware of all VLANs. There are occasions, however,
when VTP can create unnecessary traffic. All unknown unicasts and broadcasts in a VLAN are flooded all
over the VLAN. All switches in the network receive all broadcasts, even in situations where few users are
connected in that VLAN.
VTP pruning is a feature used to eliminate (prune) this unnecessary traffic.
QUESTION 116
You are a network engineer and you’ve been assigned the task of configuring an Ethernet media trunk between two Cisco switches. Assuming that these two switches have the same modules, software revisions and VLAN configurations, which of the following are true for the trunk to operate? (Choose all that apply)
A. The link must be a point to point one if ISL encapsulation is used.
B. The link must be 100Mbs or slower
C. The link must use the IEEE 802.1Q trunk protocol.
D. The link may use the IEEE 802.1Q trunk protocol.
E. The link can operate at 10, 1000, or 100 Mbs interfaces
Correct Answer: ADE Section: (none) Explanation
Explanation/Reference:
Explanation:
A: This statement is true. ISL trunks must be configured on point to point links; point-to-multipoint configurations are not supported.
D: This statement is also true. 802.1Q can be used, but it does not have to be.
E: Trunks can operate at 10, 100, or 1000 Mbps interfaces Incorrect Answers: B: Trunks can operate at 10, 100, or 1000 Mbps interfaces.
C: The industry standard method of trunking is 802.1Q. As an alternative to this, the Cisco proprietary ISL method is also an option for setting up trunks.
QUESTION 117
The following output was seen on a Certkiller switch:
Refer to the show interface Gi0/1 switchport command output shown in the exhibit.
Based on the information shown above, which two statements are true about this interface? (Select two)
A. This interface is a member of a voice VLAN.
B. This interface is a dot1q trunk passing all configured VLANs.
C. This interface is configured for access mode.
D. This interface is a member of VLAN7.
E. This interface is a member of VLAN1.
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
Explanation:
In Exhibit, Operation mode is in static access and Access mode VLAN is 7 so it means this port is
operating on access mode as a member of VLAN 7.
QUESTION 118
Two Certkiller switches are connected as shown below:
Certkiller 1 and Certkiller 2 are connected via a 200M EtherChannel link as shown in the diagram. The command “switchport mode access” is issued on interface FastEthernet0/13 on switch Certkiller 1. What will be the result?
A. The command will be rejected by the switch.
B. Interfaces FastEthernet0/13 and FastEthernet0/14 will no longer be bundled.
C. Interfaces FastEthernet0/13 and FastEthernet0/14 will only allow traffic from the native VLAN.
D. Interfaces FastEthernet0/13 and FastEthernet0/14 will continue to pass traffic for VLANs 88,100,360.
E. Dynamic Trunking Protocol will be turned off on interfaces FastEthernet0/13 and FastEthernet0/14.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: EtherChannel bundles can consist of up to eight physical ports of the same Ethernet media type and speed. Some configuration restrictions exist to ensure that only similarly configured links are bundled. Generally, all bundled ports must first belong to the same VLAN. If used as a trunk, bundled ports must all be in trunking mode, have the same native VLAN, and pass the same set of VLANs. Each of the ports should also have the same speed and duplex settings before they are bundled. Bundled ports must also be configured with identical Spanning Tree settings.
QUESTION 119
Certkiller 1 configuration exhibit:
Certkiller 2 configuration exhibit:
Study the exhibits shown above carefully. Switch Certkiller 1 is not applying VLAN updates from switch Certkiller 2. What are three reasons why this is not occurring? (Select three)
A. The VTP domains are different.
B. The passwords do not match.
C. Switch Certkiller 2 is in server mode.
D. Switch Certkiller 1 is in transparent mode.
E. VTP trap generation is disabled on both switches.
F. The MD5 digests do not match.
Correct Answer: ABD Section: (none) Explanation
Explanation/Reference:
Explanation: Determine the VTP mode of operation of the switch and include the mode when setting the VTP domain name information on the switch. If you leave the switch in server mode, be sure to verify that the configuration revision number is set to 0 before adding the switch to the VTP domain. It is generally recommended that you have several servers in the domain, with all other switches set to client mode for purposes of controlling VTP information. It is also highly recommended that you use secure mode in your VTP domain. Assigning a password to the domain will accomplish this. This will prevent unauthorized switches from participating in the VTP domain. From the privileged mode or VLAN configuration mode, use the vtp password password command.
QUESTION 120
The “show vlan” command was issued on a Certkiller device as shown below:
Study the exhibit carefully. Based upon the output on switch Certkiller 1, what can we conclude about interfaces Fa0/13 and Fa0/14?
A. That interfaces Fa0/13 and Fa0/14 have a domain mismatch with another switch
B. That interfaces Fa0/13 and Fa0/14 have a duplex mismatch with another switch
C. That interfaces Fa0/13 and Fa0/14 are trunk interfaces
D. That interfaces Fa0/13 and Fa0/14 are down
E. That interfaces Fa0/13 and Fa0/14 are in VLAN 1
F. None of the above
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation:
trunk-This setting places the port in permanent trunking mode. The corresponding switch port at the other
end of the trunk should be similarly configured because negotiation is not allowed. You should also
manually configure the encapsulation mode.
show vlan: This commands shows the vlan, ports belonging to VLAN means that port on access mode. It
doesn’t shows the port on trunk mode.
QUESTION 121
The following output was shown on a Certkiller device:
Study the exhibit carefully. On the basis of the output generated by the show commands, which two statements are true? (Select two)
A. There are no native VLANs configured on the trunk.
B. VLAN 2 will not be encapsulated with an 802.1q header.
C. VLAN 1 will not be encapsulated with an 802.1q header.
D. Because it has not been assigned to any VLAN, interface gigabitethernet 0/1 does not appear in the show vlan output.
E. Because it is configured as a trunk interface, interface gigabitethernet 0/1 does not appear in the show vlan output.
F. All interfaces on the switch have been configured as access ports.
Correct Answer: CE Section: (none) Explanation
Explanation/Reference:
Explanation:
The IEEE 802.1Q protocol can also carry VLAN associations over trunk links. However, this frame
identification method is standardized, allowing VLAN trunks to exist and operate between equipment from
multiple vendors.
In particular, the IEEE 802.1Q standard defines an architecture for VLAN use, services provided with
VLANs, and protocols and algorithms used to provide VLAN services.
Like Cisco ISL, IEEE 802.1Q can be used for VLAN identification with Ethernet trunks.
Instead of encapsulating each frame with a VLAN ID header and trailer, 802.1Q embeds its tagging
information within the Layer 2 frame. This method is referred to as single-tagging or internal tagging.
802.1Q also introduces the concept of a native VLAN on a trunk. Frames belonging to this VLAN are not
encapsulated with any tagging information. In the event that an end station is connected to an 802.1Q
trunk link, the end station can receive and understand only the native VLAN frames. This provides a simple
way to offer full trunk encapsulation to the devices that can understand it, while giving normal access
stations some inherent connectivity over the trunk.
show vlan: This commands shows the vlan, ports belonging to VLAN means that port on access mode. It
doesn’t show the port on trunk mode.
QUESTION 122
Two Certkiller switches connect multiple VLANs as shown below:
Certkiller 1 configuration exhibit:
Certkiller 2 configuration exhibit:
Refer to the exhibits and the show interfaces fastethernet0/1 switchport outputs.
Users in VLAN 5 on switch Certkiller 1 complain that they do not have connectivity to the users in VLAN 5 on switch Certkiller 2. What should be done to fix the
problem?
A. Define VLAN 5 in the allowed list for the trunk port on Certkiller 2
B. Configure the same number of VLANs on both switches.
C. Disable pruning for all VLANs in both switches.
D. Define VLAN 5 in the allowed list for the trunk port on Certkiller 1.
E. Create switch virtual interfaces (SVI) on both switches to route the traffic.
F. None of the above.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation:
switchport trunk allowed vlan, defines which VLANs can be trunked over the link. By default, a switch
transports all active VLANs (1 to 4094) over a trunk link.
There might be times when the trunk link should not carry all VLANs. For example, broadcasts are
forwarded to every switch port on a VLAN-including the trunk link because it, too, is a member of the
VLAN.
If the VLAN does not extend past the far end of the trunk link, propagating broadcasts across the trunk
makes no sense.
QUESTION 123
In the Certkiller network, VLAN Trunking Protocol (VTP) is running with a domain name of CK1 . VLANs 1, 2, 3, 4, 5, 10, 20 are active on the network. Suddenly the whole network goes down. No traffic is being passed on VLANs 2, 3, 4, 5, 10, 20.
However, traffic passes on VLAN 1 and indicates all switches are operational. Right before the network problem occurred; a switch named Certkiller 13 was taken out of the lab and added to the network. What three configuration issues on Certkiller 13 could be causing the network outage? (Select three)
A. Certkiller 13 has a higher VTP configuration revision than the current VTP revision.
B. Certkiller 13 is configured as a VTP server with a different domain name.
C. Certkiller 13 is configured as a VTP server with the domain name CK1 .
D. Certkiller 13 has a lower VTP configuration revision than the current VTP revision.
E. Certkiller 13 is not configured to participate in VTP.
F. Certkiller 13 is configured with only VLAN1.
Correct Answer: ACF Section: (none) Explanation
Explanation/Reference:
Explanation: VTP Modes:
1.
Server By default, a Catalyst switch is in the VTP server mode and in the “no management domain” state until the switch receives an advertisement for a domain over a trunk link or a VLAN management domain is configured. A switch that has been put in VTP server mode and had a domain name specified can create, modify, and delete VLANs. VTP servers can also specify other configuration parameters such as VTP version and VTP
pruning for the entire VTP domain. VTP information is stored in NVRAM.
2.
Client The VTP client maintains a full list of all VLANs within the VTP domain, but it does not store the information in NVRAM. VTP clients behave the same way as VTP servers, but it is not possible to create, change, or delete VLANs on a VTP client. Any changes made must be received from a VTP server advertisement. Client will make contact with the VTP server in between 5 minutes, it copies the advertisements from that VTP server having highest Revision number. So, before connecting any switch into LAN verify that new switch is in which mode, what is the revision number, is that highest than other switch operated in server mode?
3.
Transparent VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN configuration, and does not synchronize its VLAN configuration based on received advertisements. However, in VTP Version 2, transparent switches do forward VTP advertisements that the switches receive out their trunk ports. VLANs can be configured on a switch in the VTP transparent mode, but the information is local to the switch (VLAN information is not propagated to other switches) and is stored in NVRAM
QUESTION 124
Refer to the following outputs shown on a Certkiller switch: Exhibit #1
Exhibit #2 Study the exhibits carefully. What command was issued on this Certkiller switch between Exhibit #1 and Exhibit #2?
A. no router eigrp 1
B. mls qos
C. ip routing
D. router eigrp 1
E. no mls qos
F. no ip routing
G. None of the above
Correct Answer: F Section: (none) Explanation
Explanation/Reference:
Explanation:
IP routing is Enabled, so to disabled IP routing use:
#no ip routing
QUESTION 125
The Certkiller administrator has issue the “show vlan id 5” command. What will this command display? (Select two)
A. Ports in VLAN 5
B. Utilization
C. VLAN information on port 0/5
D. Filters
E. MTU and type
Correct Answer: AE Section: (none) Explanation
Explanation/Reference:
Explanation:
#show vlan id 5 : Shows all ports belonging to VLAN 5 and MTU of ports and type.
QUESTION 126
You’re a network administer and you issue the command (show port 3/1) on an Ethernet port. To your surprise you notice a non-zero entry in the ‘Giants’ column.
What could be the cause of this?
A. IEEE 802.1Q
B. IEEE 802.10
C. Misconfigured NIC
D. User configuration
E. All of the above
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
The 802.1Q standard can create an interesting scenario on the network. Recalling that the maximum size for an Ethernet frame as specified by IEEE 802.3 is 1518 bytes, this means that if a maximum-sized Ethernet frame gets tagged, the frame size will be 1522 bytes, a number that violates the IEEE 802.3
standard. To resolve this issue, the 802.3 committee created a subgroup called 802.3ac to extend the maximum Ethernet size to 1522 bytes. Note: The show port command is used to display port status and counters. Giants denote the number of received giant frames (frames that exceed the maximum IEEE 802.3 frame size) on the port. Reference: Trunking between Catalyst 4000, 5000, and 6000 Family Switches Using 802.1q Encapsulation http://www.cisco.com/warp/public/473/27.html
QUESTION 127
You have a trunk link operating between two switches and you’re experiencing problems with frames leaking between the two VLANs. Each switch has identical modules, software revisions and VLAN configuration information. Spanning tree protocol is disabled on all VLANs. What is probably causing this problem? (Select all that apply)?
A. The link is using IEEE 802.1Q protocol
B. The link is using IEEE 802.1E protocol
C. Spanning tree is disabled
D. Not enough information to determine.
E. The native VLAN information is identical at each end of the link.
F. The native VLAN information is different at each end of the link.
Correct Answer: AF Section: (none) Explanation
Explanation/Reference:
Explanation: While internal to a switch, VLAN numbers and identification are carried in a special extended format that allows the forwarding path to maintain VLAN isolation from end to end without any loss of information. Instead, outside of a switch, the tagging rules are dictated by standards such as ISL or 802.1Q. ISL is a Cisco proprietary technology and is in a sense a compact form of the extended packet header used inside the device: since every packet always gets a tag, there is no risk of identity loss and therefore of security weaknesses. On the other hand, the IEEE committee that defined 802.1Q decided that because of backward compatibility it was desirable to support the so-called native VLAN, that is to say, a VLAN that is not associated explicitly to any tag on an 802.1Q link. This VLAN is implicitly used for all the untagged traffic received on an 802.1Q capable port. This capability is desirable because it allows 802.1Q capable ports to talk to old 802.3 ports directly by sending and receiving untagged traffic. However, in all other cases, it may be very detrimental because packets associated with the native VLAN lose their tags, for example, their identity enforcement, as well as their Class of Service (802.1p bits) when transmitted over an 802.1Q link. For these sole reasons-loss of means of identification and loss of classification-the use of the native VLAN should be avoided. Reference: http://www.cisco.com/en/US/products/hw/switches/ps708/products_white_paper09186a008013159f.shtml
QUESTION 128
What command could you enter to display the trunking status of a module/port in the switch? (Type in the answer below):
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
Explanation:
Use the show trunk command to display trunking information for the switch.
show trunk [mod_num[/port_num]] [detail]mod_num (Optional) Number of the module.
/port_num (Optional) Number of the port.
detail (Optional) Keyword to show detailed information about the specified trunk port.
QUESTION 129
You are troubleshooting a Catalyst 5000 trunk in the Certkiller network. What should you do if there’s a disagreement about the VLANs configured to use the trunk?
A. Reload the active VLAN configuration
B. Clear the affected port and bring it up again.
C. Explicitly set the trunk for the VLAN to be on.
D. Remove all the VLANs set
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: In this situation you may want to set or clear the VLANS on both ends. A trunk is a point-to-point link between one or more Ethernet switch interfaces and another networking device such as a router or a switch. Trunks carry the traffic of multiple VLANs over a single link and allow you to extend VLANs across an entire network. Two trunking encapsulations are available on all Ethernet interfaces: Inter-Switch Link (ISL)-ISL is a Cisco-proprietary trunking encapsulation 802.1Q-802.1Q is an industry-standard trunking encapsulation When a trunk is first brought up using either of these methods, it may be beneficial to clear the port immediately after.
QUESTION 130
You want to check your Catalyst switch port to see if there’s an active link state.
Which of the following actions would NOT be useful? (Select all that apply)
A. Switch fan
B. Port’s link LED of the Switching Module.
C. Switch RP
D. Switch slot
E. Switch backplane
Correct Answer: ACDE Section: (none) Explanation
Explanation/Reference:
Explanation:
To find out if there is an active link state on a Catalyst port, check the port’s link LED. As an alternative,
using various show commands will also aid in troubleshooting port problems. However, checking the fan,
RP, slot, or backplane will not help when looking for the status of an individual port’s link status.
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