单项选择题

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

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单项选择题

A. supports multiple MIBs
B. includes NetFlow， NBAR， and IP SLA software subsystems
C. includes NetFlow， 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

单项选择题

Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual （counter-rotating） ring topology？（）

A. DTP
B. RPR
C. SDH
D. CWDM
E. DWDM

单项选择题

One of your customers wishes to use the NAS to perform DHCP functions and does not currently have a Layer 3 gateway in its production network. Which gateway mode is appropriate for this customer？（）

A. Virtual Gateway
B. Real-IP Gateway
C. NAT Gateway
D. IP-IP Gateway