Wireshark WCNA 問題練習

Question No : 1
Refer to the exhibit.



This is a DNS inverse query packet used to resolve an IP address to a host name.

• A.True
• B.False

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Question No : 2
Which name resolution process translates port numbers to service names if they are listed in Wireshark's services file?

• A.SMI name resolution
• B.network name resolution
• C.transport name resolution
• D.MAC address name resolution

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Question No : 3
Wireshark contains numerous pre-defined columns that can be added easily to the Packet List pane.

• A.True
• B.False

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Question No : 4
Which statement about packet timestamps is correct?

• A.Sorting on packet timestamps alters the packet numbers in the trace file.
• B.Packet timestamps for pcap files can denote time to the nanosecond level.
• C.You can alter packet timestamps of separate packets in a trace file using Editcap.
• D.Packet timestamps are provided by WinPcap, libpcap, or AirPcap at the time packets are captured.

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Question No : 5
Refer to the exhibit.



This image shows frame 2781 which is a Window Update packet. This packet indicates that 10.0.52.164's TCP Window Size field value has increased since the last packet sent by that host.

• A.True
• B.False

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Question No : 6
Refer to the exhibit.



Which statement about the Capture Options window shown is correct?

• A.Wireshark will resolve IP addresses to host names.
• B.Wireshark will scroll to display the most recent packet captured.
• C.Wireshark will attempt to resolve OUI values for all MAC addresses.
• D.Wireshark will automatically stop capturing packets after two files have been saved.

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Question No : 7
You can force Wireshark to temporarily dissect traffic to and from port 18067 as IRC traffic using the Decode As function.

• A.True
• B.False

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Question No : 8
Which function provides host name-to-IP address resolution services?

• A.ARP
• B.DNS
• C.ICMP
• D.SNMP

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Question No : 9
The UDP header checksum is optional.

• A.True
• B.False

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Question No : 10
Wireshark can import CSV (comma separated value) format files for further analysis.

• A.True
• B.False

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Question No : 11
DNS can only resolve IP addresses to host names.

• A.True
• B.False

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Question No : 12
Applications may override the default port value defined in the TCP/IP stack services file.

• A.True
• B.False

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Question No : 13
ICMP is used as a messaging system for errors, alerts, and general notifications on an IP network.

• A.True
• B.False

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Question No : 14
Refer to the exhibit.



Which statement about the highlighted capture filter is correct?

• A.This filter will generate an error.
• B.This filter will capture gratuitous ARP pack"*
• C.This filter will capture DNS PTR queries using port 53.
• D.This filter will capture DNS packets that use non-standard port numbers.

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Question No : 15
Refer to the exhibit.



The image depicts eight files that are part of a file set.

• A.True
• B.False

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