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單項選擇題The network administrator has discovered that the power supply has failed on a switch in the company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch. What must be done to ensure that this new switch becomes the root bridge on the network？（）

A. Lower the bridge priority number.
B. Change the MAC address of the switch.
C. Increase the VTP revision number for the domain.
D. Lower the root path cost on the switch ports.
E. Assign the switch an IP address with the lowest value.

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1.單項選擇題which command allows you to verify the encapsulation type （CISCO OR IETF） for a frame relay link？（）

A.show frame-relay map
B.show frame-relay lmi
C.show inter serial
D.show frame-relay pvc

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2.單項選擇題As a CCNA candidate, you must have a firm understanding of the IPv6 address structurE.Refer to IPv6 address, could you tell me how many bits are included in each filed?（）

A.24
B.4
C.3
D.16

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3.單項選擇題What is the alternative notation for the IPV6 address B514：82C3：0000：0000：0029：EC7A：0000：EC72？（）

A.B514：82C3：0029：：EC7A：0000：EC72
B.B514：82C3：0029：EC7A：EC72
C.B514：82C3：：0029：EC7A：0：EC72
D.B514：82C3：：0029：EC7A：EC72

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4.單項選擇題 The Frame Relay network in the diagram is not functioning properly. What is the cause of the problem?（）

A.The Gallant router has the wrong LMI type configured
B.Inverse ARP is providing the wrong PVC information to the Gallant router
C.The S3 interface of the Steele router has been configured with the frame-relay encapsulation ietf command
D.The frame-relay map statement in the Attalla router for the PVC to Steele is not correct
E.The IP address on the serial interface of the Attalla router is configured incorrectly

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5.單項選擇題How should a router that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?（）

A.Configure a separate sub-interface for each PVC with a unique DLCI and subnet assigned to the subinterface B
B.Configure each Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic
C.Configure many sub-interfaces on the same subnet
D.Configure a single sub-interface to establish multiple PVC connections to multiple remote router interfaces

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6.多項選擇題Which of the following are types of flow control？（）

A. buffering
B. cut-through
C. windowing
D. congestion avoidance
E. load balancing

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7.多項選擇題Which of the following describes the roles of devices in a WAN? （）

A.A CSU/DSU terminates a digital local loop
B.A modem terminates a digital local loop
C.A CSU/DSU terminates an analog local loop
D.A modem terminates an analog local loop
E.A router is commonly considered a DTE device
F.A router is commonly considered a DCE device

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8.多項選擇題Which of the following IP addresses fall into the CIDR block of 115.64.4.0/22？（）

A. 115.64.8.32
B. 115.64.7.64
C. 115.64.6.255
D. 115.64.3.255
E. 115.64.5.128
F. 115.64.12.128

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9.多項選擇題Which of the following are key characteristics of PPP? （）

A.can be used over analog circuits
B.maps Layer 2 to Layer 3 address
C.encapsulates several routed protocols
D.supports IP only
E.provides error correction

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10.多項選擇題Which three approaches can be used while migrating from an IPV4 addressing scheme to an IPV6 scheme？（）

A.statically map IPV4 address to IPV6 addresses
B.configuration IPv4 tunnels between IPV6 islands
C.use DHCPv6 to map IPV4 addresses to IPV6 addresses
D.use proxying and translation to translate IPV6 packets into IPV4 packets
E.configure IPV6 directly
F.enable dual-stack routing

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