单项选择题
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
单项选择题 Which of these is a benefit of ESM?（）
单项选择题 How does ERS use the VLAN tag?（）
单项选择题 Your MPLS implementation is currently using internal backdoor links. What can you do to minimize the impact of having these links?（）
