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


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4.多項選擇題

Refer to the exhibit. The Layer 2 network uses VTP to manage its VLAN database. A network designer created all VLANs on the VTP server （switch 1） and it has been advertised through VTP to all other VTP clients （switches 2 through 4）. Due to network growth，a network operator decided to add a new switch between switch 1 and switch 3. The network operator has been instructed to use a refurbished switch and use a VTP client. Which three of these factors should the network operator consider to minimize the impact of adding a new switch？（）

A.Pay special attention to the VTP revision number， because the higher value takes the priority.
B.Configure all VLANs manually on the new switch in order to avoid connectivity issues.
C.A trunk should be established between the new switch and switches 1 and 3 as VTP only runs over trunk links.
D.Set at least the VTP domain name and password to get the new switch synchronized.
E.An ISL trunk should be established between the new switch and switches 1 and 3，because VTP only runs over ISL.
F.Pay special attention to the VTP revision number， because the lower value takes the priority.

5.多項選擇題Which two of these elements need to be configured prior to enabling SSH？（）

A.hostname
B.loopback address
C.default gateway
D.domain name
E.SSH peer address