Which of the following configurations can be used to prevent users from connecting a hub to an access port on a switch allowing multiple device to access the network?

Four routers are running, the router type has been marked R1.R2.R3.R4 ISIS ISIS R1 R1 10.34.34.4 class
standard, look at the routing table check, did not arrive
The reason for the route is

The following descriptions about the PPP CHAP ?( ) protocol authentication function are correct.

Which of the following statements regarding IS-IS LSP fragment extension is true?

Router and router are connected to the network HW1 HW2 A B HW1 HW2 are not connected to the network. As shown below, if you want between the router and the router set up . IPsec VPN Which router needs to be configured to enable the HW1 ACL LAN LAN VPN to send traffic to the encrypted tunnel?