單項選擇題Which of the following is a characteristic of a data center core？（）

A. Server-to-server traffic always remains in the core layer.
B. The recommended practice is for the core infrastructure to be in Layer 3.
C. The boundary between Layer 2 and Layer 3 should be implemented in the aggregation layer.
D. The Cisco Express Forwarding hashing algorithm is the default， based on the IP address andLayer 4 port.
E. Core layer should run BGP along with an IGP because iBGP has a lower administrativedistance than any IGP.


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1.多項選擇題Which two of these multicast deployments are most susceptible to attacks from unknown sources？（）

A. ASM
B. BiDir PIM
C. PIM-SM RP
D. RP-Switchover
E. Source Specific Multicast

2.單項選擇題What is the default value of the SPT threshold in Cisco routers？（）

A. 0
B. 1
C. 2
D. 4
E. 16
F. infinity

3.多項選擇題

Refer to the exhibit. Which two statements are correct regarding the creation of a multicas tdistribution tree？ （）

A. Each router determines where to send the JOIN request.
B. The tree will be built based on the IP address of the E2 interface on router E
C. The best path to the source will be discovered in the unicast routing table on router B
D. The best path to the source will be discovered in the unicast routing table on router C
E. The best path to the source will be discovered in the unicast routing table on router E

4.單項選擇題To which of these does IP multicast send packets？（）

A. a single host
B. a subset of hosts
C. all hosts sequentially
D. all hosts simultaneously

5.單項選擇題Which of these ports does syslog use to send messages to a syslog server？（）

A. TCP 502
B. TCP 514
C. TCP 520
D. UDP 502
E. UDP 514
F. UDP 520