单项选择题
A. The first number in the contiguous block of addresses
B. The last number in the contiguous block of addresses
C. The size of the contiguous block of addresses
D. The subnet mask of the original network address
多项选择题 WhichtworestrictionsmusttheEnterpriseCampusnetworkdesignerconsiderwhenevaluatingWANconnectivityoptions？（）
单项选择题 WhichtechnologyisanexampleoftheneedforadesignertoclearlydefinefeaturesanddesignedperformancewhendesigningadvancedWANserviceswithaserviceprovider？（）
多项选择题 WhichtwoofthesearecharacteristicsofMPLSVPNs？（）