单项选择题 A users Junos Pulse client uses 802.1X to access a wired network and is failing to authenticate. You run a packet capture from the users PC and notice that immediately after the client machine sends an EAPoL-start packet, an EAP-failure packet is returned. You review the RADIUS troubleshooting logs on the MAG Series device and do not see any authentication attempts from the user. Other users on the same Ethernet switch are successfully authenticating. Which device is sending the EAP-failure packet to the workstation?（）

多项选择题 You have a firewall enforcer protecting resources in a data center. A user is experiencing difficulty connecting to a protected resource.Which two elements must exist so the user can access the resource?（）

单项选择题 Click the Exhibit button. What is the cause of the error shown in the exhibit?（）