多选题The Company LAN switches are being configured to support the use of Dynamic VLANs. Which of  the following are true of dynamic VLAN membership？（）AVLAN membership of a user always remains the same even when he/she is moved to another  location.BVLAN mem

第1题：

第2题：

You are troubleshooting an issue which is causing full-sized packets entering the MPLS cloud be dropped. You have discovered that one of the switches in the MPLS core is not a Cisco switch, but otherwise the MPLS MTU size is set to 1508 bytes on the routers. Based on this information, which of these may be the reason the packets are being dropped?（）

• A、The switch on you MPLS core that was not produced by Cisco does not support oversized packets
• B、No switches support oversized packets
• C、By definition, the maximum MTU is 1500 bytes
• D、As MPLS VPN labeling increases the size of the packet by 8 bytes, the IP MTU should have been changed to 1508

第3题：

第4题：

Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on all interfaces in the network to support a new video streaming application. No other multicast configuration was applied anywhere in the network. Since enabling multicast， the network monitoring tools show periodic spikes in link utilization throughout the network， even in areas where the video application is not being used. What could be a possible cause？（）

• A、PIM sparse mode is being used.
• B、PIM dense mode is being used.
• C、The BGP multicast address family has not been configured.
• D、IGMP version 3 is being used.
• E、IP PIM neighbor filters have not been applied.

第5题：

In the Company wireless LAN，  what is the function of the Service Set Identifier （SSID）？（）

• A、 The SSID must match on both the Company client and the Company access point and provides  MAC Address Authentication to authenticate the client to the access point.
• B、 The SSID should be configured on the Company client site only and provides data-privacy  functions and authentication to the access point.
• C、 The SSID must match on both the Company client and the Company access point and provides encryption keys for authentication to the access point.
• D、 The SSID must match on both the Company client and the Company access point. The SSID is  advertised in plain-text in the access point beacon messages.  
• E、 None of the other alternatives apply

第6题：

The Company network utilizes the Multiple-instance Spanning Tree protocol in its switched LAN.   Which three statements about the MST protocol （IEEE 802.1S） are true？ （）

• A、 To verify the MST configuration， the show pending command can be used in MST configuration  mode.
• B、 When RSTP and MSTP are configured； UplinkFast and BackboneFast must also be enabled.
• C、 All switches in the same MST region must have the same VLAN-to-instance mapping， but  different configuration revision numbers.
• D、 All switches in an MST region， except distribution layer switches， should have their priority  lowered from the default value 32768.
• E、 An MST region is a group of MST switches that appear as a single virtual bridge to adjacent  CST and MST regions.
• F、 Enabling MST with the "spanning-tree modemst" global configuration command also enables  RSTP.

第7题：

What is the recommended practice regarding UDLD when implementing it in all fiber-optic LAN ports?（）

• A、Adjust the default hello timers to three seconds for aggressive mode.
• B、Enable it in global mode and on every interface you need to support.
• C、Enable it in global mode to support every individual fiber-optic interface.
• D、Enable it to create channels containing up to eight parallel links between switches.
• E、Enable it in global mode to support every individual fiber optic and Ethernet interface.

第8题：

第9题：

An administrator is configuring a Catalyst switch with VLAN information that must be automatically distributed to other Catalyst switches in the network. What conditions must be met in order for the VLANs configured on this switch to be automatically configured on the other switches?（）

• A、The switch that will share its VLAN configuration must be in VTP server mode.
• B、The switches must be in the same VTP domain.
• C、The switch that will share the VLAN information must be configured as the root bridge.
• D、The switches must be connected over VLAN trunks.
• E、The switches must be configured to use the same STP version.
• F、The switches must have VTP pruning activated.

第10题：

Which statement about Cisco Unified Fabric switches is correct？ （）   

• A、 The Nexus 5000 family of switches does not support vPC when running in either NPV or FCoE NPV mode.
• B、 The MDS 9100 family of switches is an excellent design choice as a Unified Fabric edge switch. 
• C、 The Nexus 7000 Series Switches can support the NPIV mode of operation， but cannot function as a complete Fibre Channel Forwarder.
• D、 The Nexus 7000 Series Switches cannot support advanced Cisco Fibre Channel features such as IVR.
• E、 The MDS family of Cisco Unified Fabric switches supports both the Fibre Channel Forwarder and Fibre Channel Bridge functions.