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WCA-101 test Format | WCA-101 Course Contents | WCA-101 Course Outline | WCA-101 test Syllabus | WCA-101 test Objectives

Exam Number: WCA-101

Exam Name: Wireshark Certified Network Analyst

Number of Questions: 50-60

Time allotment: 120 minutes



- Open, save, and close files, and export specified packets.

- Describe the difference between different capture file formats, especially pcap and pcapng.

- Export objects from packet captures.

- Use 'Find Packet' to locate packets of interest.

- Use the packet and file comments feature.

- Set/Unset time reference.

- Apply different time formats in a capture.

- Describe how Wireshark applies different name resolution options.

- Configure name resolution.

- Use 'Decode as' feature.

- Use 'Capture File Properties' to identify key information about the capture.

- Use 'Protocol Hierarchy' to identify key protocols in a capture.

- Use 'Conversations' to identify key communications in a capture.

- Use 'Endpoints' to analyze host traffic in a capture.

- Create and interpret an I/O graph that shows packets/s or bits/s for a given display filter.

- Distinguish between actual bytes captured and fields generated by the Wireshark dissectors. (shown in [ ])

- Use 'Follow TCP/UDP' stream



- Utilize different methods of Capturing Traffic

- Compare and contrast the benefits of different methods used for traffic capture. (Direct on Endpoint, Network Tap, Infrastructure Device, Port Mirror, Multi-Point Capture)

- Select the appropriate interface to capture traffic in Wireshark.

- Start/Stop/Restart Capture in Wireshark.

- Limit capture by file size, packets, or duration.

- Implement a Ring Buffer.

- Save a capture.

- Export specified packets to a new file.

- Capture traffic using command line tools.

- Describe the purpose of using promiscuous or monitor mode during a capture.



- Filter traffic using capture and display filters.

- Compare and contrast Display Filters and Capture Filters.

- Implement a Capture Filter to capture only traffic from a single protocol, IP address, MAC address, or port (range).

- Use multiple methods to create a Display Filter to isolate traffic for a single protocol or a property of a protocol. (manual entry, right click, drag/drop)

- Use membership filters (tcp.port in {80,443} )

- Use logical operators to connect multiple filters together.

- Create a button for easy access to a Display Filter.

- Identify situations where a Display Filter will show incomplete or excess results (i.e. filter for HTTP, but do not see the TCP handshake)

- Identify the behavior of using ! (not) in different parts of filter logic by explaining the implicit 'any' and 'all' qualifiers.

- Apply filters from Statistics > Conversations and Statistics > Endpoints.

- Create a filter using generated fields in Wireshark.



- Configure, adapt, and use the Wireshark interface for different scenarios.

- Identify key components of the GUI (packet list, hex view, packet details, etc.).

- Modify panes with a different layout/features.

- Describe the value of using profiles.

- Create/modify/copy a profile.

- Describe the importance of columns in troubleshooting.

- Use multiple methods to add a column.

- Use coloring rules to highlight packets.

- Use the minimap (colored sidebar) to quickly locate packets of interest.

- Use the 'Colorize Conversation' feature.

- Understand the importance of protocol preferences in your analysis.

- Use the mark/unmark packet feature.



- Identify and explain common network protocols dissected by Wireshark

- ETHERNET

- Identify Fields of Ethernet frame.

- Describe minimum and maximum frame sizes.

- Explain why the CRC is missing from Ethernet frame in Wireshark.

- Identify common Ethertypes (IPv4, IPv6, ARP).

- Distinguish between Unicast, Broadcast, and Multicast MAC addresses.

- Describe how the frame header is modified to accommodate VLAN tags.

- ARP

- Describe the purpose of the ARP protocol.

- Identify and explain the purpose of different types of ARP packets.

- Create filters for different types of ARP traffic.

- Describe the difference between a broadcast ARP and a unicast ARP.

- IPv4

- Describe common features of the IP protocol.

- Describe header values of the IP protocol (TTL, Fragmentation, Packet Length, ProtocolID, IP ID).

- Describe public, private, multicast and APIPA IP address ranges.

- Describe how NAT works and why this should be considered when capturing andanalyzing network traffic.

- Identify and explain the purpose of the IP TTL field.

- Predict most likely distance, in hops, from the capturing device.

- Describe different IP identification strategies and how to use them in troubleshooting.

- ICMPv4

- Identify ICMP message types and their purpose.

- Identify the IP packet which triggered an ICMP error message or reply.

- IPv6

- Identify types of IPv6 addresses (Link Local, Global Unicast, Multicast).

- ICMPv6

- Identify and explain components of neighbor/router discovery protocol.

- Identify and explain purpose of Neighbor Advertisements/Solicitations.



- Identify and explain common network protocols dissected by Wireshark.

- UDP

- Identify UDP traffic.

- Identify higher layer protocols which use UDP.

- Describe the UDP stream id and conversation timestamps.

- Describe why UDP is used in multicast or broadcast IP traffic.

- DHCPv4

- Identify and describe the 4 phases (DORA).

- Describe the different purposes of a 'DHCP Request' message.

- Identify DHCP options and parameters (router, dns, subnetmask, custom options).

- Describe APIPA and how it relates to DHCP.

- DNS

- Identify DNS requests and replies.

- Use DNS information to identify relevant traffic.

- Distinguish between different DNS record types.

- TCP

- Describe the components of a 3 way handshake.

- Describe different methods TCP session are torn down.

- Explain how iRTT is measured.

- Describe and calculate Maximum Segment Size(MSS).

- Describe how TCP flags are used to establish and tear down a TCP session.

- Explain how sequence and acknowledgment numbers are used to maintain reliability.

- Explain TCP options and their purpose.(EOL, NOP, MSS, SACK, DSACK, Window Scaling)

- Describe the purpose of a DUP ACK.

- Identify the byte range of missing segments based on a DUP ACK with SACK or DSACK.

- Describe what each line represents in a TCP Stream Graph.

- Describe the purpose of TCP reassembly in Wireshark.

- Describe the TCP stream id and conversation timestamps.



- Use Wireshark to troubleshoot common issues with protocols listed above

- Determine network topology only using information in a packet capture.

- Perform TCP sequence and acknowledgment number analysis.

- Distinguish server performance from slow transfer times (for instance in HTTP).

- Identify the effect of high RTT on request/response protocols. (For example: HTTP, SMB,SQL)

- Identify the effect of a low window size in combination with high RTT.

- Given a capture, identify potential network communication issues using information from ARP, DHCP, and ICMP.

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