单项选择题

At which of the following layers does the TFTP protocol operate?（）

A.Layer 1
B.Layer 4
C.Layer 5
D.Layer 7

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单项选择题

Which of the following is a multifunction device in a SOHO network?（）

A. Bandwidth shaper
B. Proxy server
C. Wireless router
D. Load balancer

单项选择题

Which of the following utilities can be used to list the routing table?（）

A.ipconficj
B.nslookup
C.netstat
D.dig

单项选择题

A web server is running correctly but sending a RST packet to any client trying to connect using HTTP on TCP port 80.
Which of the following tools should be used to determine the listening port of the web server?（）

A.Route
B.Ifconfig
C.Netstat
D.Nslookup