At which layer of the OSI model dose PPP perform?（）

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?（）

A router receives information about network 192.168.10.0/24 from multiple sources.What will the router consider the most reliable information about the path to that network?（）

You have been asked to come up with a subnet mask that will allow all three web servers to be on the same network while providing the max number of subnets.Which network address and subnet mask meet this requirement?（）

How are VTP advertisements delivered to switches across the network?（）

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

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

What is the default administrative distance of OSPF?（）

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

A network administrator needs to configure a serial link between the main office and a remote location.The router at the remote office is a non-cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?（）