Process Switching
Silicon Switching
Cisco Express Forwarding (CEF) Switching
Autonomous Switching
第1题：
A company implements video conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails completely. What is the most likely reason for this?（）
A.minimum cell rate (MCR)
B.quality of service (QoS)
C.modulation
D.packet switching exchange (PSE)
E.reliable transport protocol (RTP)
第2题：
What is the best description of serialization delay？ （）
第3题：
A.Frame Relay
B.POTS
C.PSTN
D.ISDN
第4题：
Using more than one label on a single packet is required in what context？（）
第5题：
A company implements video conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails completely. What is the most likely reason for this?（）
第6题：
第7题：
GMPLS is based upon：（）
第8题：
Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, destined for an Enterprise network.Which of the following answers best describes the router‘s logic that tells the router, for a given packet, to apply GRE encapsulation to the packet?（）
A. When the packet received on the LAN interface is permitted by the ACL listed on the tunnel greacl command under the incoming interface
B. When routing the packet, matching a route whose outgoing interface is the GRE tunnel interface
C. When routing the packet, matching a route whose outgoing interface is the IPsec tunnel interface
D. When permitted by an ACL that was referenced in the associated crypto map
第9题：
Whichof the following are valid modes of packet switching on most routers？（Choose all thatapply.）（）
第10题：
What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations？（）