问题:
A . Filtering is only useful when combined with route summarization
B . It is best to filter (allow) the default and summary prefixes only in the Enterprise Edge to remotesites or site-to-site IPsec VPN networks
C . IGPs (for example EIGRP or OSPF) are superior to route filtering in avoiding in inappropriatetransit traffic through remote nodes or inaccurate or inappropriate routing updates
D . The primary limitation of router filtering is that it can only be applied on outbound update
● 参考解析
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