單項選擇題Which device enables a router serial interface to connect to the ISDN BRI?（）

A.NT2
B.NT1
C.TE
D.TA
E.TE1


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1.多項選擇題What functions do routers perform in a network?（）

A. Packet Switching
B. Access Layer Security
C. Path Selection.
D. VLAN Membership Assignment.
E. Bridging between LAN segments.
F. Micro-segmentation of Broadcast Domains.

2.單項選擇題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

3.多項選擇題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

4.多項選擇題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.

5.多項選擇題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.