单选题After enabling port security on a Cisco Catalyst switch， what is the default action when the configuredmaximum of allowed MAC addresses value is exceeded？（）A The port’s violation mode is set to restrictB The port is shut downC The MAC address table is 

第1题：

When you enter the interface command auto qos voip cisco-phone on a port at the edge of a network,how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port?（）

• A、by snooping the CoS marking on the incoming frames
• B、by using RTP hello messages between the switch port and the Cisco IP Phone
• C、by using CDP
• D、by using DHCP snooping
• E、by snooping the incoming 802.1Q VLAN tag

第2题：

A new Catalyst switch is connected to an existing switch using a crossover cable. As a result of this, what would the switch port link lights display?（）

• A、The switch port link lights will be off on both switches indicating the ports are not connected.
• B、The switch port link light will be off on one switch indicating that STP has disabled the port.
• C、The switch port link lights will flash amber indicating an error.
• D、The switch port link lights will be green indicating normal operation.

第3题：

You are at a client site. It is a medium-sized business and needs a Cisco Catalyst switch that offers high availability and security. What type of Catalyst switches would you recommend？（）

• A、 Catalyst 2960 Series
• B、 Catalyst 3750 Series
• C、 Catalyst 4900 Series
• D、 Catalyst 6500 Series

第4题：

You have configured voice VLANs on Catalyst switch R1.  Which two statements are true about the  operation of voice VLANs on this device？ （）

• A、 When the voice VLAN feature is enabled， all untagged traffic is sent according to the default  CoS priority of the port.
• B、 Enabling voice VLANs enables the switch to create multiple queues for traffic that is entering a  port.
• C、 When voice VLANs are configured on a trunk link， UplinkFast must also be enabled.
• D、 Voice VLANs are configured to enable the switch to forward frames marked with the proper  CoS values over separate physical links.
• E、 Enabling voice VLANs enables the switch to forward frames with a specific 802.1P marking.

第5题：

The network security policy requires that only one host be permitted to attach dynamically to each switch interfacE.If that policy is violated, the interface should shut down. Which two commands must the network administrator configure on the 2950 Catalyst switch to meet this policy? （）

• A、Switch1(config-if)# switchport port-security maximum 1
• B、Switch1(config)# mac-address-table secure
• C、Switch1(config)# access-list 10 permit ip host
• D、Switch1(config-if)# switchport port-security violation shutdown
• E、Switch1(config-if)# ip access-group 10

第6题：

The voice VLAN feature has been enabled on a new Company Catalyst switch port.  What is the  effect of this？ （）

• A、The CoS is trusted for 802.1P or 802.1Q tagged traffic.
• B、PortFast is disabled on the port.
• C、Port Security is automatically enabled on a voice VLAN port.
• D、Untagged traffic is sent according to the default CoS priority of the port.
• E、None of the other alternatives apply

第7题：

The network security policy requires that only one host be permitted to attach dynamically to each switch interface. If that policy is violated, the interface should shut down. Which two commands must the network administrator configure on the 2950 Catalyst switch to meet this policy (Choose two.)（）。

• A、Switch1(config-if)# switchport port-security maximum 1
• B、Switch1(config)# mac-address-table secure
• C、Switch1(config)# access-list 10 permit ip host
• D、Switch1(config-if)# switchport port-security violation shutdown
• E、Switch1(config-if)# ip access-group 10

第8题：

When configuring port security on a Cisco Catalyst switch port， what is the default action taken by the switch if a violation occurs？ （）

• A、protect （drop packets with unknown source addresses）
• B、restrict （increment SecurityViolation counter）
• C、shut down （access or trunk port）
• D、transition （the access port to a trunking port）

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第13题：

While troubleshooting a connectivity problem, a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate?（）

• A、The port is experiencing errors.
• B、The port is administratively disabled.
• C、The port is blocked by spanning tree.
• D、The port has an active link with normal traffic activity.

第14题：

You examine the port statistics on a Cisco Catalyst switch and notice an excessive number offrames are being dropped. Which of the following are possible reasons for the drops？（）

• A、Unknown destination MAC address
• B、Bad cabling
• C、MAC forwarding table is full
• D、Port configured for half duplex
• E、Port configured for full duplex
• F、Network congestion

第15题：

Which statement correctly describes network security settings in Cisco Network Assistant for the Catalyst Express 500 Switch？（）

• A、The LOW setting enables broadcast storm control， but has no effect on the number of devices that can connect to a switch port
• B、The LOW setting enables broadcast storm control and limits the number of devices that can connect to a switch port.
• C、The LOW setting disables broadcast storm control but limits the number of devices that can connect to a switch port
• D、The default network setting is "HIGH"

第16题：

While troubleshooting a connectivity problem, a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate（）。

• A、The port is experiencing errors
• B、The port is administratively disabled
• C、The port is blocked by spanning tree
• D、The port has an active link with normal traffic activity

第17题：

When using Cisco Network Assistant to configure a WS-CE500-24LC switch， which three are available choices in the port settings window？（）

• A、Duplex mode selections
• B、Auto MDIX selections
• C、Status Selections
• D、Group mode selections
• E、Port security selections

第18题：

Which of these commands can you use to show if an operational Catalyst switch port is set for autonegotiation of speed and duplex when running Cisco IOS software?（）

• A、show port network
• B、 show running-config
• C、show controllers Ethernet-controller
• D、 show interfaces

第19题：

As a network administrator, you issue the interface auto qos voip cisco-phone command on a port in an edge network. It is possible for a Cisco Catalyst switch to check if a Cisco IP Phone is directly attached to that port by:（）

• A、using DHCP snooping
• B、snooping the incoming 802.1Q VLAN tag
• C、using CDP
• D、snooping the CoS marking on the incoming frames

第20题：

By default, each port in a Cisco Catalyst switch is assigned to VLAN1. Which two recommendations are key to avoid unauthorized management access? （）

• A、Create an additional ACL to block the access to VLAN 1.
• B、Move the management VLAN to something other than default.
• C、Move all ports to another VLAN and deactivate the default VLAN.
• D、Limit the access in the switch using port security configuration.
• E、Use static VLAN in trunks and access ports to restrict connections.
• F、Shutdown all unused ports in the Catalyst switch.

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