多項選擇題Which of the following are types of flow control? (Choose three.)（）

A.buffering
B.cut-through
C.windowing
D.congestion avoidance
E.load balancing


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1.單項選擇題Acknowledgements, sequencing, and flow control are characteristics of which OSI layer?（）

A.Layer 2
B.Layer 3
C.Layer 4
D.Layer 5
E.Layer 6
F.Layer 7

2.單項選擇題When a new trunk link is configured on an IOS based switch, which VLANs are allowed over the link?（）

A.By default， all defined VLANs are allowed on the trunk.
B.Each single VLAN， or VLAN range， must be specified with the switchport mode command.
C.Each single VLAN， or VLAN range， must be specified with the vtp domain command.
D.Each single VLAN， or VLAN range， must be specified with the vlan database command.

3.單項選擇題When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined?（）

A.It is supplied by the CSU/DSU.
B.It is supplied by the far end router.
C.It is determined by the clock rate command.
D.It is supplied by the Layer 1 bit stream timing.

4.單項選擇題What is one reason that WPA encryption is preferred over WEP?（）

A.A WPA key is longer and requires more special characters than the WEP key.
B.The access point and the client are manually configured with different WPA key values.
C.WPA key values remain the same until the client configuration is changed.
D.The values of WPA keys can change dynamically while the system is used.

5.單項選擇題A router learns about a remote network from EIGRP, OSPF, and a static route. Assuming all routing protocols are using their default administrative distance, which route will the router use to forward data to the remote network?（）

A.The router will use the static route.
B.The router will use the OSPF route.
C.The router will use the EIGRP route.
D.The router will load balance and use all three routes.

8.多項選擇題Which two practices help secure the configuration utilities on wireless access points from unauthorized access? (Choose two.)（）

A.assigning a private IP address to the AP
B.changing the default SSID value
C.configuring a new administrator password
D.changing the mixed mode setting to single mode
E.configuring traffic filtering

9.單項選擇題What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table?（）

A.The switch will not forward unicast frames.
B.The switch will forward the frame to a specific port.
C.The switch will return a copy of the frame out the source port.
D.The switch will remove the destination MAC from the switch table.
E.The switch will forward the frame to all ports except the port on which it was received.

10.多項選擇題Which of the following are key characteristics of PPP? (Choose three.)（）

A.can be used over analog circuits
B.maps Layer 2 to Layer 3 address
C.encapsulates several routed protocols
D.supports IP only
E.provides error correction