单项选择题
Cisco Express Forwarding (CEF) is mainly used to increase packet switching speed, reducing the overhead and delays introduced by other routing techniques, increasing overall performance.Which of the following concerning CEF is recommended by Cisco?（）
A. Use default Layer 4 hash in core.
B. Use default Layer 3 hash in distribution.
C. Use default Layer 4 hash in distribution.
D. Use default Layer 3 hash in core and Layer 3 + Layer 4 hash in distribution layer.
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Please match the Cisco STP enahancement term to its definition.（） (1) BPDU guard (2) PortFast (3) BackboneFast (4) Loop guard (5) Root guard (a) shuts down a port that receives a BPDU when enabled (b) cuts convergence time by mas-age for indirect failure (c) prevents the aliernate or root port from being designated in absence of BPDUs (d )causes Layer 2 LAN interface access port to immediately enter the forwarding state (e) helps prevent bridging loops due to jni-directional link failures on point-to-point links
A.（a）-（1）；（b）-（2）；（c）-（4）；（d）-（5）；（e）-（3）
B.（a）-（4）；（b）-（3）；（c）-（2）；（d）-（5）；（e）-（1）
C.（a）-（3）；（b）-（2）；（c）-（4）；（d）-（5）；（e）-（1）
D.（a）-（1）；（b）-（3）；（c）-（4）；（d）-（2）；（e）-（4）
