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Question 1:

What is the function of NSF?

A. forward traffic simultaneously using both supervisors

B. forward traffic based on Cisco Express Forwarding

C. provide automatic failover to back up supervisor in VSS mode

D. provide nonstop forwarding in the event of failure of one of the member supervisors

Correct Answer: D

VSS is network system virtualization technology that pools multiple Cisco Catalyst 6500 Series Switches into one virtual switch, increasing operational efficiency, boosting nonstop communications, and scaling system bandwidth capacity to

1.4 Tbps. Switches would operate as a single logical virtual switch called a virtual switching system 1440 (VSS1440). VSS formed by two Cisco Catalyst 6500 Series Switches with the Virtual Switching Supervisor 720-10GE. In a VSS, the data plane and switch fabric with capacity of 720 Gbps of supervisor engine in each chassis are active at the same time on both chassis, combining for an active 1400- Gbps switching capacity per VSS. Only one of the virtual switch members has the active control plane. Both chassis are kept in sync with the inter-chassis Stateful Switchover (SSO) mechanism along with Nonstop Forwarding (NSF) to provide nonstop communication even in the event of failure of one of the member supervisor engines or chassis. Reference: http://ciscorouterswitch.over-blog.com/article- cisco-catalyst-6500-series-vss-1440- 124536783.html

Question 2:

Which statement about the use of SDM templates in a Cisco switch is true?

A. SDM templates are used to configure system resources in the switch to optimize support for specific features, depending on how the switch is used in the network.

B. SDM templates are used to create Layer 3 interfaces (switch virtual interfaces) to permit hosts in one VLAN to communicate with hosts in another VLAN.

C. SDM templates are used to configure ACLs that protect networks and specific hosts from unnecessary or unwanted traffic.

D. SDM templates are used to configure a set of ACLs that allows the users to manage the flow of traffic handled by the route processor.

E. SDM templates are configured by accessing the switch using the web interface.

Correct Answer: A

Explanation: You can use SDM templates to configure system resources in the switch to optimize support for specific features, depending on how the switch is used in the network. You can select a template to provide maximum system usage for some functions; for example, use the default template to balance resources, and use access template to obtain maximum ACL usage. To allocate hardware resources for different usages, the switch SDM templates prioritize system resources to optimize support for certain features. Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/ release/12.2_55_s e/ configuration/guide/swsdm.pdf

Question 3:

Refer to the exhibit.

Why would the switch be considered as a root bridge?

A. The bridge priority is 1 and all ports are forwarding.

B. The switch priority for VLAN 1 and the macro specifies “This Bridge is the root”.

C. The bridge priority is 128.19 and all ports are forwarding.

D. The switch priority value is zero, it has the lowest priority value for VLAN 1.

Correct Answer: D

For priority, the range is 0 to 61440 in increments of 4096; the default is 32768. The lower the number, the more likely the switch will be chosen as the root switch.

Reference:

http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_9_ea1/config uration/ guide/swstp.html#wp1020666

Question 4:

DHCP snooping and IP Source Guard have been configured on a switch that connects to several client workstations. The IP address of one of the workstations does not match any entries found in the DHCP binding database. Which statement describes the outcome of this scenario?

A. Packets from the workstation will be rate limited according to the default values set on the switch.

B. The interface that is connected to the workstation in question will be put into the errdisabled state.

C. Traffic will pass accordingly after the new IP address is populated into the binding database.

D. The packets originating from the workstation are assumed to be spoofed and will be discarded.

Correct Answer: D

Explanation: The IP source binding table has bindings that are learned by DHCP snooping or are manually configured (static IP source bindings). An entry in this table has an IP address, its associated MAC address, and its associated VLAN number. The switch uses the IP source binding table only when IP source guard is enabled. You can configure IP source guard with source IP address filtering, or with source IP and MAC address filtering. When IP source guard is enabled with this option, IP traffic is filtered based on the source IP address. The switch forwards IP traffic when the source IP address matches an entry in the DHCP snooping binding database or a binding in the IP source binding table. When IP source guard is enabled with this option, IP traffic is filtered based on the source IP and MAC addresses. The switch forwards traffic only when the source IP and MAC addresses match an entry in the IP source binding table. If there is no match, the packets are assumed to be spoofed and will be discarded. Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series- switches/72846- layer2-secftrs-catl3fixed.html#ipsourceguard

Question 5:

The command storm-control broadcast level 75 65 is configured under the switch port connected to the corporate mail server. In which three ways does this command impact the traffic? (Choose three.)

A. SNMP traps are sent by default when broadcast traffic reaches 65% of the lower-level threshold.

B. The switchport is disabled when unicast traffic reaches 75% of the total interface bandwidth.

C. The switch resumes forwarding broadcasts when they are below 65% of bandwidth.

D. Only broadcast traffic is limited by this particular storm control configuration.

E. Multicast traffic is dropped at 65% and broadcast traffic is dropped at 75% of the total interface bandwidth.

F. The switch drops broadcasts when they reach 75% of bandwidth.

Correct Answer: CDF

storm-control {broad- Configure broadcast, multicast, or unicast storm control. By de- cast | multicast | uni- fault, storm control is disabled.

cast} level {level [lev-

The keywords have these meanings:

el-low] | pps pps [pps-low]}

For level, specify the rising threshold level for broadcast, multicast, or unicast traffic as a percentage (up to two decimal places) of the bandwidth. The port blocks traffic when the rising threshold is reached. The range is 0.00 to 100.00.

(Optional) For level-low, specify the falling threshold level as a percentage (up to two decimal places) of the bandwidth. This value must be less than or equal to the rising suppression value. The port forwards traffic when traffic drops below

this level. If you do not configure a falling suppression level, it is set to the rising suppression level. The range is 0.00 to 100.00.

In this case, the broadcast keyword was used so only broadcast traffic is limited. Reference: http:// www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/ software/release/12- 2_25_see/configuration/ guide/3550SCG/swtrafc.html

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Question 6:

Which switch feature prevents traffic on a LAN from being overwhelmed by continuous multicast or broadcast traffic?

A. storm control

B. port security

C. VTP pruning

D. VLAN trunking

Correct Answer: A

Explanation: A traffic storm occurs when packets flood the LAN, which creates excessive traffic and degrades network performance. The traffic storm control feature prevents LAN ports from being disrupted by a broadcast, multicast, or unicast traffic storm on physical interfaces from either mistakes in network configurations or from users issuing a DoS attack. Reference:http://3c3cc.com/c/en/us/td/docs/ routers/7600/ios/122SR/configuration/guide/swcg/do s.pdf

Question 7:

Which gateway role is responsible for answering ARP requests for the virtual IP address in GLBP?

A. active virtual forwarder

B. active virtual router

C. active virtual gateway D. designated router

Correct Answer: C

GLBP Active Virtual Gateway Members of a GLBP group elect one gateway to be the active virtual gateway (AVG) for that group. Other group members provide backup for the AVG in the event that the AVG becomes unavailable. The AVG assigns a virtual MAC address to each member of the GLBP group. Each gateway assumes responsibility for forwarding packets sent to the virtual MAC address assigned to it by the AVG. These gateways are known as active virtual forwarders (AVFs) for their virtual MAC address. The AVG is responsible for answering Address Resolution Protocol (ARP) requests for the virtual IP address. Load sharing is achieved by the AVG replying to the ARP requests with different virtual MAC addresses. Reference: http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/ guide/ft_glbp.html

Question 8:

Which command correctly configures standby tracking for group 1 using the default decrement priority value?

A. standby 1 track 100

B. standby 1 track 100 decrement 1

C. standby 1 track 100 decrement 5

D. standby 1 track 100 decrement 20

Correct Answer: A

The default decrement value for HSRP standby tracking is 10. There is no need to explicitly state the value if the desired value is the default value.

Question 9:

Which feature is automatically configured when an administrator enables a voice VLAN?

A. 802.1Q trunking

B. PortFast

C. QoS

D. private VLANs

Correct Answer: B

Question 10:

Which option is valid for EtherChannel load balancing?

A. source MAC address and source IP address

B. destination MAC address and destination IP address

C. source MAC address and destination IP address

D. source MAC address and destination MAC address

Correct Answer: D

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