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 and Layer 4 port.
E. Core layer should run BGP along with an IGP becauseiBGP has a lower administrative distance 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.BiDirPIM
C.PIM-SMRP
D.RP-Switchover
E.SourceSpecificMulticast

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.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

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

A.TCP502
B.TCP514
C.TCP520
D.UDP502
E.UDP514
F.UDP520

5.單項選擇題Which of these is a benefit of ESM?（）

A. supports multiple MIBs
B. includesNetFlow, NBAR, and IP SLA software subsystems
C. includesNetFlow, syslog, and IP SLA software subsystems
D. includes a predefined framework for filtering and correlating messages
E. supports two logging processes so output can be sent in standard and ESM format