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Question 1:

What is the maximum number of switches that can be stacked using Cisco StackWise?

A. 4

B. 5

C. 8

D. 9

E. 10

F. 13

Correct Answer: D

Up to 9 Cisco Catalyst switches can be stacked together to build single logical StackWise switch since Cisco IOS XE Release 3.3.0SE. Prior to Cisco IOS XE Release3.3.0SE, up to 4 Cisco Catalyst switches could be stacked together. Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series- switches/ qa_c67-722110.html

Question 2:

A network engineer wants to add a new switch to an existing switch stack. Which configuration must be added to the new switch before it can be added to the switch stack?

A. No configuration must be added.

B. stack ID

C. IP address

D. VLAN information

E. VTP information

Correct Answer: A

Question 3:

Interface FastEthernet0/1 is configured as a trunk interface that allows all VLANs. This command is configured globally: monitor session 2 filter vlan 1 – 8, 39, 52 What is the result of the implemented command?

A. All VLAN traffic is sent to the SPAN destination interface.

B. Traffic from VLAN 4 is not sent to the SPAN destination interface.

C. Filtering a trunked SPAN port effectively disables SPAN operations for all VLANs.

D. The trunk\’s native VLAN must be changed to something other than VLAN 1.

E. Traffic from VLANs 1 to 8, 39, and 52 is replicated to the SPAN destination port.

Correct Answer: E

The “monitor session filter” command is used to specify which VLANS are to be port mirrored using SPAN. This example shows how to monitor VLANs 1 through 5 and VLAN 9 when the SPAN source is a trunk interface: Switch(config)# monitor session 2 filter vlan 1 – 5 , 9 Reference: http://www.cisco.com/c/en/ us/td/docs/ switches/lan/catalyst4500/12- 2/25ew/configuration/guide/conf/span.html/ index.html#wp1066836

Question 4:

Refer to the exhibit.

What is the result of the configuration?

A. The EtherChannels would not form because the load-balancing method must match on the devices.

B. The EtherChannels would form and function properly even though the load-balancing and EtherChannel modes do not match.

C. The EtherChannels would form, but network loops would occur because the load-balancing methods do not match.

D. The EtherChannels would form and both devices would use the dst-ip load-balancing method because Switch1 is configured with EtherChannel mode active.

Correct Answer: B

An etherchannel will form if one end is active and the other is passive. The table below sum- marizes the results for LACP channel establishment based on the configuration of each side of a link: LACP Channel Establishment S1 S2 Established? On On Yes Active/Passive Active Yes On/Active/Passive Not Configured No On Active No Passive/On Passive No Load balancing can only be configured globally. As a result, all channels (manually configured, PagP, or LACP) use the same load-balancing. This is true for the switch globally, although each switch involved in the etherchannel can have non matching parameters for load balancing. Reference: http://www.cisco.com/ c/en/ us/ td/docs/switches/lan/catalyst4500/12- 2/54sg/configuration/guide/config/channel.html#wp1020804

Question 5:

After reviewing UDLD status on switch ports, an engineer notices that the.” Which statement describes what this indicates about the status of the port?

A. The port is fully operational and no known issues are detected.

B. The bidirectional status of “unknown” indicates that the port will go into the disabled state because it stopped receiving UDLD packets from its neighbor.

C. UDLD moved into aggressive mode after inconsistent acknowledgements were detected.

D. The UDLD port is placed in the “unknown” state for 5 seconds until the next UDLD packet is received on the interface.

Correct Answer: A

By default, UDLD is disabled on all interfaces. We can enable UDLD globally on the device, or individually on specific interfaces with the command udld port. This enables UDLD in normal mode. It would be prohibitively difficult to coordinate

the configuration of UDLD on both ends of a link at the same time, so when UDLD is first enabled and does not detect a neighbor the link state is considered unknown, which is not necessarily an error condition. The port will remain

operational during this time. When UDLD is finally enabled on the other end, the status will transition to bidirectional.

Reference: http://packetlife.net/blog/2011/mar/7/udld/

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Question 6:

The network manager has requested that several new VLANs (VLAN 10, 20, and 30) are allowed to traverse the switch trunk interface. After the command switchport trunk allowed vlan 10,20,30 is issued, all other existing VLANs no longer pass traffic over the trunk. What is the root cause of the problem?

A. The command effectively removed all other working VLANs and replaced them with the new VLANs.

B. VTP pruning removed all unused VLANs.

C. ISL was unable to encapsulate more than the already permitted VLANs across the trunk.

D. Allowing additional VLANs across the trunk introduced a loop in the network.

Correct Answer: A

Explanation: The “switchport trunk allowed vlan” command will only allow the specified VLANs, and overwrite any others that were previously defined. You would also need to explicitly allow the other working VLANs to this configuration command, or use the “issue the switchport trunk allowed vlan add vlan-list” command instead to add these 3 VLANS to the other defined allowed VLANs. Reference: https:// supportforums.cisco.com/document/11836/how-define-vlansallowed-trunk- link

Question 7:

A new network that consists of several switches has been connected together via trunking interfaces. If all switches currently have the default VTP domain name “null”, which statement describes what happens when a domain name is configured on one of the switches?

A. The switch with the non-default domain name restores back to “null” upon reboot.

B. Switches with higher revision numbers does not accept the new domain name.

C. VTP summary advertisements are sent out of all ports with the new domain name.

D. All other switches with the default domain name become VTP clients.

Correct Answer: C

By default, a switch will have a domain name of NULL and no password. If the switch hears a VTP advertisement it will automatically learn the VTP domain name, VLANs, and the configuration revision number.

Summary advertisements sent out every 300 seconds and every time a change occurs on the VLAN database. Contained in a summary advertisement:

VTP version

Domain name

Configuration revision number

Time stamp

MD5 encryption hash code

Reference: https://rowell.dionicio.net/configuring-cisco-vtp/

Question 8:

A network engineer is setting up a new switched network. The network is expected to grow and add many new VLANs in the future. Which Spanning Tree Protocol should be used to reduce switch resources and managerial burdens that are associated with multiple spanning-tree instances?

A. RSTP

B. PVST

C. MST

D. PVST

E. RPVST

Correct Answer: C

Multiple Spanning Tree (MST) extends the IEEE 802.1w RST algorithm to multiple spanning trees. The main purpose of MST is to reduce the total number of spanning-tree instances to match the physical topology of the network and thus reduce the CPU cycles of a switch. PVRST runs STP instances for each VLAN and does not take into consideration the physical topology that might not require many different STP topologies. MST, on the other hand, uses a minimum number of STP instances to match the number of physical topologies present. Figure 3-15 shows a common network design, featuring an access Switch A, connected to two Building Distribution submodule Switches D1 and D2. In this setup, there are 1000 VLANs, and the network administrator typically seeks to achieve load balancing on the access switch uplinks based on even or odd VLANs–or any other scheme deemed appropriate.

Figure 3-15: VLAN Load Balancing Figure 3-15 illustrates two links and 1000 VLANs. The 1000 VLANs map to two MST in- stances. Rather than maintaining 1000 spanning trees, each switch needs to maintain only two spanning trees, reducing the need for switch resources. Reference: http://ciscodocuments.blogspot.com/2011/05/chapter-03-implementing-spanning- tree_19.html

Question 9:

In a Cisco switch, what is the default period of time after which a MAC address ages out and is discarded?

A. 100 seconds

B. 180 seconds

C. 300 seconds

D. 600 seconds

Correct Answer: C

To configure the aging time for all MAC addresses, perform this task:

Command Purpose

Step 1 switch# configure ter- Enters configuration mode.

minal

Step 2 switch(config)# mac-ad- Specifies the time before an entry ages out and is dis- dress-table aging- time carded from the MAC address table. The range is from seconds [vlan vlan_id] 0 to 1000000; the default is 300 seconds. Entering

the value 0 disables the MAC aging. If a VLAN is not specified, the aging specification applies to all VLANs.

Reference:

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/M ACAddress.html

Question 10:

Which VTP mode is needed to configure an extended VLAN, when a switch is configured to use VTP versions 1 or 2?

A. transparent

B. client

C. server

D. Extended VLANs are only supported in version 3 and not in versions 1 or 2.

Correct Answer: A

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