多項選擇題The network administrator wants to enable an EtherChannel between two switches in "on" mode. The administrator connects the cables and enables the interfaces， but while configuring the EtherChannel in the first switch， a spanning-tree loop was detected. Which two of these  procedures can avoid this problem？（）

A.Configure the EtherChannel as "desirable" first.
B.Assign all interfaces to the same VLAN.
C.Disable PortFast on the interfaces in the EtherChannels.
D.Disable all interfaces first.
E.Fast Ethernet and Gigabit Ethernet ports cannot be assigned to the same EtherChannel.
F.Fix cabling problems.


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1.多項選擇題our company is researching a new application that runs over IPv6， but part of it must still have IPv4 support. Your company uses a traditional IPv4 network. Your plan is not to run IPv6 over the whole network， but to segment parts of the network or even to operate simultaneously with IPv6 and IPv4. You must make a brief presentation about IPv6 technology to the board of technical directors. Which three of these items could be part of your presentation？（）

A.Tunnel IPv6 over IPv4 to connect far-end IPv6 networks.
B.Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is not possible.
C.Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is possible.
D.What is the meaning of EUI-64 and how does it work？
E.Tunnel IPv4 over IPv6 to connect far-end IPv4 networks.

2.多項選擇題Half of your network uses RIPv2 and the other half runs OSPF. The networks do not communicate with each other. Which two of these factors describe the impact of activating EIGRP over each separate part？ （）

A.EIGRP will not be accepted when configured on the actual RIPv2 routers.
B.OSPF will no longer be used in the routing table， because you only have EIGRP internal routes running.
C.OSPF will no longer be used in the routing table， because you only have EIGRP external routes running.
D.RIPv2 will populate its RIP database but not its routing table， because you only have EIGRP external routes running.
E.RIPv2 will populate its RIP database but not its routing table， because you only have EIGRP internal routes running.
F.OSPF database will have RIPv2 routes.

3.多項選擇題he network administrator is trying to add Switch1 to the network， but the 802.1Q trunk is not  coming up. Switch1 was previously tested in the laboratory and its trunk configuration worked fine.  What are three possible causes of this problem？（）

A.The trunking configuration mode on Switch1 is set to Off.
B.The trunking configuration mode on the other end is set to On.
C.The trunking configuration mode on the other end is set to Desirable.
D.Cisco Discovery Protocol is not running on the other end.
E.There is a VTP domain name mismatch.
F.Switch1 does not support 802.1Q

4.單項選擇題Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause？（）

A.BGP peers must be Layer 2-adjacent.
B.EBGP multihop is not configured.
C.The firewall is not configured to allow IP protocol 89.
D.The firewall is not configured to allow UDP 179.

7.單項選擇題panning Tree Protocol calculates path cost based on which of these？（）

A.interface bandwidth
B.interface delay
C.interface bandwidth and delay
D.hop count
E.bridge priority

8.單項選擇題An expanding company is deploying leased lines between its main site and two remote sites. The bandwidth of the leased lines is 128kb/s each， terminated on different serial interfaces on the main router. These links are used for combined VOIP and data traffic. The network administrator has implemented a VOIP solution to reduce costs， and has therefore reserved sufficient bandwidth in a low latency queue on each interface for the VOIP traffic. Users now complain about bad voice quality although no drops are observed in the low latency queue. What action will likely fix this problem？（）

A.mark VOIP traffic with IP precedence 6 and configure only ’fair-queue’ on the links
B.configure the scheduler allocate 3000 1000 command to allow the QoS code to have enough CPU cycles
C.enable class-based traffic shaping on the VoIP traffic class
D.enable Layer 2 fragmentation and interleaving on the links
E.enable Frame Relay on the links and send voice and data on different Frame Relay PVCs

9.多項選擇題Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree  Protocol IEEE 802.1D？ （）

A.Designated Root Cost
B.bridge ID priority
C.max age
D.bridge ID MAC address
E.Designated Root Priority
F.forward delay

10.單項選擇題To troubleshoot network issues more accurately， milliseconds should be included in the syslog of the router. Which command will achieve this？（）

A.service timestamps log datetimec msec
B.logging timestamps msec
C.syslog timestamps hour minute second miliseconds
D.service logging timestamp msec
E.logging service timestamp msec

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