單項選擇題You are the Cisco Network Designer in Cisco.com. Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual ringtopology？（）

A. Dynamic Trunking Protocol
B. Resilient Packet Ring
C. Synchronous Digital Hierarchy
D. Coarse Wave Division Multiplexing


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2.單項選擇題Cisco Express Forwarding （CEF） is mainly used to increase packet switching speed， reducing theoverhead 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.

3.多項選擇題Which three statements about firewall modes are correct？ （）

A. A firewall in routed mode has one IP address
B. A firewall in transparent mode has one IP address
C. In routed mode， the firewall is considered to be a Layer 2 dew
D. In routed mode， the firewall is considered to be a Layer 3 device
E. In transparent mode， the firewall is considered to be a Layer 2 device
F. In transparent mode， the firewall is considered to be a Layer 3 device

4.單項選擇題

Refer to the exhibit.

Which of the following is an advantage of device clustering utilizing Virtual Port Channels （vPC）？（）

A. A logical star topology provides a loop free environment so that all links will be used forwardtraffic
B. Enhanced EtherChannel hashing load balancing using the vPC peer link internal to the VPC
C. The control plane functions of the Nexus switches are merged to hide the use of virtualization
D. Neighboring devices connect on a Layer 3 MEC for improved packet forwarding

5.單項選擇題Which of these statements about FSPF is true？（）

A. It supports multipath routing
B. It can run any type of storage ports
C. When it is used， hop-by-hop routes are based only on the switch ID
D. When it is used， path status is based on the functionality of attached ports
E. It runs only on a switch fabric and cannot function in a VSAN