单选题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

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第3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4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5题：

Which two statements about configuration an unconnected Catalyst Express 500 switch from setup mode using a PC are true？（）

• A、You may use Cisco Network Assistant to set up the initial configuration
• B、You must use CLI for initial configuration
• C、You may use either CLI or CAN for configuration
• D、You may make a direct connection to the PC from any point on the switch
• E、You may only make a direct connection from the port with the flashing green LED to the PC

第6题：

A network administrator needs to configure port security on a switch.which two statements are true？（）

• A、The network administrator can apply port security to dynamic access ports
• B、The network administrator can configure static secure or sticky secure mac addresses in the voice vlan.
• C、The sticky learning feature allows the addition of dynamically learned addresses to the runningconfiguration.
• D、The network administrator can apply port security to EtherChannels.
• E、When dynamic mac address learning is enabled on an interface，the switch can learn new addresses，up to the maximum defined.

第7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8题：

You need to configure port security on switch R1.  Which two statements are true about this  technology？ （）

• A、 Port security can be configured for ports supporting VoIP.
• B、 With port security configured， four MAC addresses are allowed by default.
• C、 The network administrator must manually enter the MAC address for each device in order for  the switch to allow connectivity.
• D、  Withsecurity configured， only one MAC addresses is allowed by default.  
• E、 Port security cannot be configured for ports supporting VoIP.

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第14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15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：

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）

第20题：

While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist（）。

• A、the session layer
• B、the protocol layer
• C、the data link layer
• D、the access layer
• E、the network layer
• F、the application layer

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