单项选择题
A. echo
B. jitter
C. packet loss
D. digitized sampling
单项选择题 WhichVPNmanagementfeaturewouldbeconsideredtoensurethatthenetworkhadtheleast disruptionofservicewhenmakingtopologychanges？（）
多项选择题 Which two of these are correct regarding the recommended practice for distribution layer designbased on the following configuration？（）
单项选择题 WhattypeofCallAdmissioncontrolinCallManagerallowsforlimitstothebandwidthconsumed byactivecalls？（）