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.