單項選擇題At which layer of the OSI model is RSTP used to prevent loops?()

A. data link
B. network
C. physical
D. transport


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2.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

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

4.單項選擇題DNS servers provide what service?()

A. They run a spell check on host names to ensure accurate routing
B. They convert domain names into IP address
C. Given an IP address,they determine the name of the host that is sought
D. They map individual hosts to their specific IP addresses