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單項選擇題

What authentication type is used by SNMPv2?（）

A.HMAC-MD5
B.HMAC-SHA
C.CBC-DES
D.community strings

多項選擇題

What are two enhancements that OSPFv3 supports over OSPFv2? （）

A.It requires the use of ARP.
B.It can support multiple IPv6 subnets on a single link.
C.It supports up to 2 instances of OSPFv3 over a common link.
D.It routes over links rather than over networks.