What functions do routers perform in a network?（）

单项选择题If NVRAM lacks boot system commands, where does the router look for the Cisco IOS by default?（）

A.ROM
B.RAM
C.Flash
D.Bootstrap
E.Startup-.config

多项选择题When selecting a Network Interface Card (NIC), which of the following factors need to be considered?（）

A. The type of application used on the network
B. The type of system bus used by the computers
C. The type of memory installed in each computer
D. The type of media used in the network topology
E. The type of protocols used in the network
F. The physical layout of the network hosts

多项选择题On a Cisco network, which of the following modes of flow control are commonly used to mitigate the effects of busy data networks?（）

A. Source Quench.
B. Learning.
C. Buffering.
D. Windowing.
E. Cut-Through.

多项选择题After replacing the NIC card of a PC on the LAN, your Cisco switch shows a new MAC address is attached to that port. Which of the following answer choices below correctly describe a MAC address?（）

A. It is a globally unique IP address.
B. It is a globally unique 48 bit address
C. It is provided by the manufacturer of the NIC.
D. It is used as part of the IPX/SPX configuration.
E. It is a logical address.

多项选择题Which of the following correctly describe the various functions and virtues of a router?（）

A. Packet switching
B. Collision prevention on a LAN segment.
C. Packet filtering
D. Broadcast domain enlargement
E. Broadcast forwarding
F. Internetwork communication