The network administrator cannot to switch 1 over a telnet session,although the hosts attached to switch 1 can ping the interface Fa0/0 of the router.Given the information in the graphic and assuming that the router and switch2 are configured properly,which of the following commands should be issued on switch 1 to correct this problem?（）

Which statement is true, as relates to classful or classless routing?（）

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

What is the subnetwork address for a host with the IP address 201.100.5.68/28?（）

An administrator must assign static IP addresses to the servers in a network.For network 192.168.20.24/29, the router is assigned the first usable host address while the sales server is given the last usable host address. Which of the following should be entered into the IP propertied box for the sales server?（）

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?（）

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

What is the purpose of the cisco Vlan Trunking protocol?（）

Which command encrypts all plaintext passwords?（）

What is the result of issuing the frame-relay map ip 192.168.1.2 202 broadcast command?（）