If an edge Label Switch Router （LSR） is properly configured，which three combinations are possible？（）
A . A received IP packet is forwarded based on the IP destination address and the packet is sent as an IP packet.
B . An IP destination exists in the IP forwarding table. A received labeled packet is dropped because the label is not found in the LFIB table.
C . There is an MPLS label-switched path toward the destination. A received IP packet is dropped because the destination is not found in the IP forwarding table.
D . A received IP packet is forwarded based on the IP destination address and the packet is sent as a labeled packet.
E . A received labeled IP packet is forwarded based upon both the label and the IP address.
F . A received labeled packet is forwarded based on the label. After the label is swapped，the newly labeled packet is sent.
相似题目
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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 .
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MPLS的连接称为LSP（Label Switch Path标签交换通道），要建立一个LSP必须借助于信令协议，在以下各种协议中哪种可用于建立LSP。（）
A . IPCP
B . LCP
C . LDP
D . NO.7
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Which four services use the inner labels of an MPLS label stack？ （）
A . MPLS VPN
B . switching path in MPLS core
C . Cisco MPLS Traffic Engineering and Fast Reroute
D . MPLS over ATM
E . VPN over Traffic Engineering core
F . any transport over MPLS
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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 frame
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What IOS commands display MPLS label mapping on an LSR？（）
A . Show mpls forwading-table
B . Show mpls ldp bindings
C . Show mpls ldp neighbor detail
D . Show mpls ldp parameters
E . Show mpls ldp discovery
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What are the four fields in an MPLS label？（）
A . version
B . experimental
C . label
D . protocol
E . TTL
F . bottom-of-stack indicato
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MPLS label mapping on an LSR is displayed by which IOS command？（）
A . Show mpls Idp neighbor detail
B . Show mpls Idp bindings
C . Show mpls Idp parameters
D . Show mpls Idp discovery
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MPLS的连接称为LSP（Label Switch Path标签交换通道），要建立一个LSP必须借助于信令协议，以下（）协议可用于建立LSP管理VLAN。
A . IPCP
B . LCP
C . LDP
D . NO.7
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If an enterprise customer required A switch for their branch office access layer, which family of switches would the customer likely choose from?（）
A . Cisco SFS 3000/7000
B . Cisco Catalyst 2000 and 3000
C . Cisco Catalyst 4000 and 6000
D . Cisco Nexu
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You install two Exchange Server 2010 Service Pack 1 （SP1） Edge Transport servers named Edge1 and Edge2.You need to ensure that e-mail is sent only to Edge2 if Edge1 fails. What should you do？（）
A . Create two CNAME records that have the same name.Create one MX record that uses the FQDN of the CNAME records.Assign a priority of 0 to the MX record.
B . Create two MX records.Assign the MX record for Edge1 a priority of 5.Assign the MX record for Edge2 a priority of 1.
C . Create two A records that use the same name.Create one MX record that uses the FQDN of the A record.Assign a priority of 0 to the MX record.
D . Create two MX records.Assign the MX record for Edge1 a priority of 1.Assign the MX record for Edge2 a priority of 5.
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What two things will occur when an edge port receives a BPDU？（）
A . The port immediately transitions to the Forwarding state.
B . The switch generates a Topology Change Notification （TCN） BPDU.
C . The port immediately transitions to the err-disable state.
D . The port becomes a normal STP switch port.
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You are conducting a cdp-based discovery using an edge switch for the seed. there is a router between the switch and the wlse. none of the access points are discovered， and the discovery log shows the switch is snmp unreachable. What is the problem？（）
A . the snmp communities on the switch do not match the wlse.
B . the snmp communities on the access points do not match the wlse.
C . the snmp communities on the access points do not match the switch.
D . the snmp communities on the router do not match the wlse.
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Select the action that results from executing these commands. Switch（config-if）# switchport port-security. Switch（config-if）# switchport port-security mac-address sticky（）
A . A dynamically learned MAC address is saved in the startup-configuration file.
B . A dynamically learned MAC address is saved in the running-configuration file.
C . A dynamically learned MAC address is saved in the VLAN database.
D . Statically configured MAC addresses are saved in the startup-configuration file if frames from that address are received.
E . Statically configured MAC addresses are saved in the running-configuration file if frames from that address are received.
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Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label， if the stack bit is set to1， which option is true？（）
A . The stack bit will only be used when LDP is the label distribution protocol
B . The label is the last entry in the label stack.
C . The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol.
D . The stack bit is reserved for future use.
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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
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If an enterprise customer required a switch for their branch office access layer, which family of switches would the customer likely choose from?（）
A . Cisco Catalyst 2000 and 3000
B . Cisco Nexus
C . Cisco Catalyst 4000 and 6000
D . Cisco SFS 3000/7000
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C51中语句if和switch都可以构建分支结构。
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哪个命令可以使用户在Switch(config-if)#提示符下进入Switch# 模式?
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有些选择结构，既可以使用switch命令实现，也可以使用if命令实现
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IF R1 〉= R2 GOTOF LABEL1 …LABEL1：…是（）
A．赋值语句
B．条件跳转语句
C．循环语句
D．无条件跳转语句
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下面是一个窗体的单击事件过程： Privme Sub Form_Click（）If Commandl.Enabled Then Label1.Caption="命令按钮可以使用!" Else Label1.Caption="命令按钮不可以使用!" End If End Sub该窗体事件的功能是 。
A．判断命令按钮是否可见，以便在标签上显示不同的信息
B．判断命令按钮是否可用，以便在标签上显示不同的信息
C．判断命令按钮是否设置了默认按钮，以便在标签上显示不同的信息
D．If语句中的条件不合法，事件过程错误，不能执行。
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“IF R1>=R2 GOTOFLABEL…LABEL：…；”是（）（SIEMENS系统）
A．赋值语
B．条件跳转语句
C．循环语句
D．无条件跳转语句
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44、[FZ]if语句中，不能嵌套switch语句。
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C语言中分支选择语句属于哪一类语句 一个双分支选择语句if是几条C语句 if语句有几种使用形式,分别为 简述什么是if语句的嵌套形式,嵌套形式的作用是什么 switch语句中,switch（）中的表达式使用限制是什么 对switch语句中,case 语句标号:,中的语句标号使用有什么限制 是否所有多分支问题,都可以使用switch语句处理,if语句的嵌套形式呢 写出下面的程序 从键盘输入三个整数,按从小到大的顺序输出
