多项选择题
A. The default OSPF domain-id is 127.0.0.1.
B. In most cases, a domain-id must be configured.
C. In most cases, you do not need to configure a domain-id.
D. For a layer 3 VPN connecting multiple OSPF domains, configuring a domain-id can help control LSA translations.
单项选择题 A BGP router should use three export policies named add-communities, no-rfc1918-routes, andrejected-unwanted. Which export statement places the add-communities policy immediately before the default BGP policy?（）
多项选择题 What are three TLVs that support IS-IS extensions for traffic engineering?（）
多项选择题 Which two BGP attributes support route reflection?（）