單項選擇題The system administrator notices that after running netstat -rn， several small c’s are showing up under the flags columns， and routes that were not defined are also showing up. How can these cloned routes be stopped？（）

A. By default cloned routes are turned on.  To turn cloned routes off issue the command：      #no -o tcp_pmtu_discover=0       #no -o udp_pmtu_discover=0       and add to the rc.net or rc.bsdnet file for next reboot
B. By default cloned routes are turned on.  To turn cloned routes off issue the command：        # no -o tcp_pmtu_discover=1        #no -o udp_pmtu_discover=1         and add to the rc.net or rc.bsdnet file for next reboot
C. By default cloned routes are turned on.  To turn cloned routes off issue the command：         #no -o ipforwarding=0         and add to the rc.net or rc.bsdnet file for next reboot
D. By default cloned routes are turned on.  To turn cloned routes off issue the command：         #no -o ipforwarding=1         and add to the rc.net or rc.bsdnet file for next reboot


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1.單項選擇題

To examine the Exhibit， press the Exhibit button. Using the "ps -el" output as shown in the exhibit， which of the following conclusions is most appropriate to draw？（）

A. The snmpd process is running at a fixed priority of 60
B. If both the syncd process and the portmap process become available to be run at the same time， then the syncd process would get scheduled first
C. If both the userprog process and the qdaemon process become available to be run at the same time， then the qdaemon process would get scheduled first
D. If both the syslogd process and the llbd process become available to be run at the same time， then the llbd process would get scheduled first

3.單項選擇題The nice value is 60 in the  ps listing.  Which command is used to change this to a value of 20？（）

A. renice -n -20 {PID}
B. renice -n 20 {PID}
C. renice -n -40 {PID}
D. renice -n 40 {PID}

4.單項選擇題The nfsstat -c command shows zero badxid， but retrans and timeouts are sizeable， what is the most probable cause of the problem？（）

A. Too many nfsd’s running
B. Client and server with different buffer sizes
C. Bridges， routers or gateways are receiving too many fragmentated packets
D. Too few nfsd’s running

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