While using a packet analyzer， you notice four additional bytes being added to the packets in the  Company network.  Which protocol inserts a four byte tag into the Ethernet frame and recalculates  CRC value？  （）A、 DTPB、 VTPC、 802.1QD、 ISLE、 None of the 

第1题：

What are two things that an access point （AP） does when it receives an 802.11 frame from a Wi-Fi Multimedia （WMM） client？ （）

• A、EAP-FASTEAP-FAS Access Point Protocol （LWAPP） packet is used to generate an 802.1 p priority value in the packets， which are sent to an Ethernet switch by the controllers.
• B、The AP will police the 802.1 le priority value to ensure it does not exceed the maximum value allowed for the QoS policy that is assigned to that client.
• C、Once the LWAPP packet is received， the AP generates the IEEE 802.1 p priority value.
• D、The AP will map the 802.11e priority value to the DSCP value.
• E、The AP will map the DSCP value to the outer LWAPP frame.

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：

ISL is being configured on a Company switch.  Which of the following choices are true regarding  the ISL protocol？ （）

• A、 It can be used between Cisco and non-Cisco switch devices.
• B、 It calculates a new CRC field on top of the existing CRC field.
• C、 It adds 4 bytes of protocol-specific information to the original Ethernet frame.
• D、 It adds 30 bytes of protocol-specific information to the original Ethernet frame.

第4题：

A user opens a webpage that requires the transmission of packets from the Web server to the client's browser. The packets transmitted from the Web server to the client exceed the smallest MTU value on the communications path. Which two protocol functions allow this type of communication?（）

• A、packet segmentation
• B、serialized checking
• C、packet sequencing
• D、parallel checking

第5题：

If you needed to transport traffic coming from multiple VLANs （connected between switches）， and  your CTO was insistent on using an open standard，which protocol would you use？（）

• A、802.11B
• B、spanning-tree
• C、802.1Q
• D、ISL
• E、VTP
• F、Q.921

第6题：

Which Ethernet field is used to differentiate between the FCoE frame and the FIP frame？（）

• A、 Ethernet FCS
• B、 Source address
• C、 Destination address
• D、 EtherType
• E、 Protocol type

第7题：

EIGRP is being used as the routing protocol on the company network. While troubleshooting somenetwork connectivity issues， you notice a large number of EIGRP SIA （Stuck in Active） messages.What causes these SIA routes？（）

• A、The neighboring router stops receiving ACK packets from this router
• B、The neighboring router starts receiving route updates from this router
• C、The neighboring router is too busy to answer the query （generally caused by high CPUutilization）
• D、The neighboring router is having memory problems and cannot allocate the memory to processthe query or build the reply packet

第8题：

Your company has just upgraded its CATAGORY 5 Ethernet network from 10Mbps to 100Mbps. After the upgrade， the 20 Windows 2000 Professional computers in the marketing department can no longer connect to the network. The remaining 80 Windows 2000 computers in the company can connect， however. Your company uses NWLink as the only network protocol.You need to connect the computers in the marketing department to the network. What must you do？ （）

• A、Configure the NWLink frame type of the network adapters to be ethernet 802.3.
• B、Configure the NWLink frame type of the network adapters to be ethernet II.
• C、Replace the network adapters with 10/100 BNC adapters.
• D、Replace the network adapters with 10/100 UTP network adapters.

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第13题：

You need to implement a high availability design in the Company routed network.  Which protocol  allows for the automatic selection and simultaneous use of multiple available gateways as well as  automatic failover between those gateways？（）

• A、 VRRP
• B、 GLBP
• C、 IRDP
• D、 HSRP
• E、 None of the other alternatives apply

第14题：

Two Company switches are connected via a trunk link. In this network， the original frame is  encapsulated and an additional header is added before the frame is carried over a trunk link. At  the receiving end， the header is removed and the frame is forwarded to the assigned VLAN.  This  describes which technology？（）

• A、 DISL
• B、 ISL
• C、 DTP
• D、 IEEE 802.1Q
• E、 MPLS
• F、 None of the other alternatives apply

第15题：

The core Company switches are configured to use 802.1Q trunks.  Which three statements are  correct with regard to the IEEE 802.1Q standard？（）

• A、 The IEEE 802.1Q frame format adds a 4 byte field to a Ethernet frame
• B、 The packet is encapsulated with a 26 byte header and a 4 byte FCS
• C、 The protocol uses point-to-multipoint connectivity
• D、 The protocol uses point-to-point connectivity
• E、 The IEEE 802.1Q frame uses multicast destination of 0x01-00-0c-00-00
• F、 The IEEE 802.1Q frame retains the original MAC destination address

第16题：

A small business currently has four separate servers， three of which perform low-overhead tasks with small memory footprints. How could the company BEST reduce power consumption among these four servers， while not sacrificing functionality？（）

• A、Enable each server’s Cool ’n’ Quiet and/or SpeedStep functionality so that processing power is conserved.
• B、Enforce auto-shutdown routines on all four servers for after-hours power saving while the office is closed.
• C、Consolidate the four servers onto the best two，combining them logically by tasks and memory consumption.
• D、Consolidate the four servers onto the most powerful machine using virtualization.

第17题：

VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?（）

• A、provide service internetworking
• B、support transparency for Layer 2 frames
• C、indicate destination as a connection identifier
• D、map to the DLCI in service internetworking

第18题：

You need to configure a new Company switch for trunking.  Which switch command enables a  trunking protocol that appends a four byte CRC to the packet？（）

• A、 CompanySwitch（config-if）#switchport trunk encapsulation dot1q
• B、 CompanySwitch（config-if）#switchport trunk encapsulation itef
• C、 CompanySwitch（config-if）#switchport trunk encapsulation fddi
• D、 CompanySwitch（config-if）#switchport trunk encapsulation isl
• E、 None of the other alternatives apply

第19题：

The Company core switches use 802.1Q trunks to connect to each other.  How does 802.1Q  trunking keep track of multiple VLANs？ （）

• A、 It tags the data frame with VLAN information and recalculates the CRC value
• B、 It encapsulates the data frame with a new header and frame check sequence
• C、 It modifies the port index of a data frame to indicate the VLAN
• D、 It adds a new header containing the VLAN ID to the data frame
• E、 None of the other alternatives apply

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