多项选择题

Which two statements about NTP version 4 are true？（）

A.It supports fast synchronization at starting and before network failures
B.It supports automatic server discovery
C.It uses a fixed-point arithmetion
D.It supports the "nanokernel" kernel implementation
E.It does not support Public-Key Cryptography

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多项选择题

Process-level redundancy is implemented by a system manager process that creates the standby process.What two functions are provided by the system-level process called Qnet Symlink Manager （QSM）？（）

A.backing up the information for the broken connections
B.provides common information for connecting processes and services
C.detection of a failed connection
D.provides an abstract name for a process or service
E.distribution of symbolic link information

单项选择题

In PIM-SM operations，to which device does the first router that connects with the multicast source sendthe register message？（）

A.RP
B.multicast source
C.IGMP router
D.multicast receiver
E.PIM designated router

单项选择题

What are the default values for GRE tunnel keeplive time and number of retries？（）

A.5 seconds and 3 retries
B.10 seconds and 5 retries
C.10 seconds and 3 retries
D.20 seconds and 5 retries
E.5 seconds and 5 retries