- Home
- Server Administration
- LPIC-2 Linux Engineer 201
46.
You type arp - n at a command prompt. What type of output will you see?
- A.A summary of network packet errors
- B.Routing table information
- C.The IP address(es) of your name server(s)
- D.The mapping of IP addresses to MAC addresses
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
47.
Which of the following commands might bring up an interface on eth1 ? (Select all that
apply.)
- A.Type dhclient eth1 .
- B.Type ifup eth1 .
- C.Type ifconfig eth1
- D.Type network eth1 .
- Answer & Explanation
- Report
Answer : [A, B]
Explanation :
Explanation :
| The dhclient utility, if installed, attempts to configure and bring up the network(s) passed to it as options (or all networks if it's given no options) using a DHCP server for guidance. Thus, option A may work, although it won't work if no DHCP server is available. Option B applies whatever network options are configured using distribution - specific tools and brings up the network. Thus, options A and B both may work, although neither is guaranteed to work. Option C displays the network status of eth1 , but it won't activate eth1 if it's not already active. There is no standard network utility in Linux. Thus, options C and D won't work. |
48.
What is the purpose of the - n option to route ?
- A.It causes no operation to be performed; route reports what it would do if - n were omitted.
- B.It precedes specification of a netmask when setting the route.
- C.It causes machines to be identified by IP address rather than hostname in output
- D.It forces interpretation of a provided address as a network address rather than a host address.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The - n option is used when you want to use route to display the current routing table, and it does as option C specifies. There is no route parameter that behaves as option A specifies. Option B describes the purpose of the netmask parameter to route . Option D describes the purpose of the - net parameter to route . |
49.
Which of the following programs can monitor the network traffic coming into a computer,
enabling you to analyze the packets'contents?
- A.OpenVPN
- B.arp
- C.netstat
- D.Wireshark
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Option D, Wireshark, is a packet sniffer, which means that it behaves as the question specifies. It includes sophisticated packet matching and analysis tools to help in this task. OpenVPN is a tool for connecting two networks in a secure way even over an insecure network. The arp utility enables inspection and alteration of a computer's Address Resolution Protocol (ARP) cache, which ties hardware addresses to IP addresses. The netstat utility is a general - purpose network utility that can display or change a wide variety of network data. |
50.
What does the following command accomplish, when typed as root ?
# nmap -sU router.example.com
# nmap -sU router.example.com
- A.It adds a default route through router.example.com to the computer on which the command is typed.
- B.It watches for UDP network traffic to or from router.example.com , displaying each matching packet.
- C.It maps the Wi - ficharacteristics associated with the router.example.com wireless network.
- D.It scans router.example.com for open (listening) UDP ports and reports the results of this scan.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The Nmap utility performs network port scans, and the - sU option specifies a scan of UDP ports, so option D is correct. A default route is most likely to be created by using the route utility or by editing configuration files; Nmap can't do this job, so option A is incorrect. The task described in option B is best done by a packet sniffer, such as tcpdump or Wireshark; Nmap can't do this. The discovery of Wi - ficharacteristics is done by the iwlist utility, not by Nmap, so option C is incorrect. |
|
|
||||||||||||||||||||||||||||
