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

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

Which Cisco IOS diagnostics command can disrupt the operation of a router under high-load conditions?（）

On which options are standard access list based?（）

Which command encrypts all plaintext passwords?（）

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 device might be installed at a branch office to enable and manage an IPsec site-to-site VPN?（）

Which address is the IPV6 all-RIP-routers muticast group address that is used by RIPng as the destaion address?（）

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?（）

While troubleshooting a network problem,a technician discovers that the current copy of the Cisco IOS is outdated and needs to be updated.Which of the following commands would the technician issue to replace the Cisco router IOS with the newer version?（）