Which command will report information on memory usage, paging and block input/output? A. free B. memshow C. ps D. top E. vmstat

In capacity planning exercises, which tools assist in listing and identifying processes of interest? (Choose TWO correct answers.) A. acpid B. lsof C. pstree D. telinit

What option in the collectd configuration file is required in order to define what to start monitoring? A. LoadModule B. Module C. Plugin D. LoadPlugin

In the below example output, which columns detail the percent of time the CPU spent running non-kernel code and the percent of time the CPU spent running kernel code? (Choose TWO correct answers.) ...

Which commands below are useful to collect data about remote filesystem connections? (Choose TWO correct answers.) A. pidstat B. nfsiostat C. sadf D. cifsiostat

What mechanism does collectd use to gather monitoring information on systems? A. It uses a library of plugins. B. A master server connects to a collectd service on each machine to retrieve the inf...

Which of the following is a side effect of extensive usage of swap space? A. The root filesystem may become full because swap space is always located on the system root partition. B. The overall s...

In the following output, the load averages represent the system load averages for what time frames? 12:10:05 up 18 days, 19:00, 2 users, load average: 0.47, 24.71, 35.31 A. 1, 5 and 15 minutes ...

When planning a web server which of the following choices will impact system sizing? (Choose THREE correct answers.) A. How many concurrent users are expected. B. Which hardware vendor has better ...

DoS(Denial of Service，阻斷服務)攻擊，又稱為洪水攻擊，是常見的網路攻擊手段。利用一台電腦發出大量的連線請求(Request)，使目標電腦的網路或系統資源耗盡，使之當機或是無法再回應正常的請求。Nginx是免費開源、穩定高效的Web伺服器，非常廣泛地被使用。Nginx的功能強大，除了可以作反向代理和負載平衡外，也可以用來防禦小規模的DoS、DDoS(Distributed De...