单项选择题

Which statement about standard STS-1 SONET framing is true？（）

A.8 rows by 64 bytes
B.6 rows by 64 bytes
C.10 rows by 96 bytes
D.8 rows by 128 bytes
E.9 rows by 90 bytes

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单项选择题

A.10 minutes
B.5 minutes
C.120 seconds
D.60 seconds
E.30 minutes

单项选择题

A.fast convergence SFP
B.MTU discovery
C.redundancy links
D.keepalive
E.carrier delay

多项选择题

A.IPsec tunnel
B.routing equivalence paths
C.traffic engineering tunnel
D.bridge or switch instance
E.groups of IP addresses