多项选择题
A.Spanning Tree Protocol（STP）
B.Delay reduction
C.Hot Standby Routing Protocol（HSRP）
D.Dynamic routing protocols
E.Quality of Service（QoS）
F.Jitter management
单项选择题 Refer to the exhibit. On the basis of the information presented， which statement is true？（）
单项选择题 From the perspective of routerPG-1，what kind of router is the router with IP address 192.23.1.1（）
多项选择题 WhiletroubleshootingaroutingproblemonthecompanyEIGRPnetworkyoudiscoverthatoneoftheroutersisfailingtoestablishadjacencieswithitsneighbor.Whatisalikelycauseofthisproblembetweenneighbors？（）