When you are troubleshooting an ACL issue on a router,which command can help you to verify which interfaces are affected by the ACL?（）

Which IPsec security protocol should be used when confidentiality is required?（）

Three switches are connected to one anther via trunk ports.Assuming the default switch configuration,which switch is elected as the root bridge for the spanning-tree instance of vlan 1?（）

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

Which cisco ios command can help to determine the timing of various debug events,relative to each other,when you are debugging a complicated router issue?（）

Which pairing reflects a correct protocol-and-metric relationship?（）

If all OSPF routers in a single area are configured with the same priority value,what value dose a router use for the ODPF router ID in the absence of a loopback interface?（）

Which command displays the CHAP authentication process as it occurs between two routers?（）

Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers?（）

Three access ports have been installed and configured to a small office.What term defines the wireless topology?（）