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Field Value Description Preamble Not shown in capture This field contains synchronizing bits, processed by the NIC hardware. The following table takes the first frame in the Wireshark capture and displays the data in the Ethernet II header fields.

Step 4: Examine the Ethernet II header contents of an ARP request. This screenshot highlights the frame details for an ARP reply. This screenshot highlights the frame details for an ARP request. The session begins with an ARP query and reply for the MAC address of the gateway router, followed by four ping requests and replies. ARP is a communication protocol that is used for determining the MAC address that is associated with the IP address. ARP stands for address resolution protocol. A filter has been applied to Wireshark to view the ARP and ICMP protocols only. The screenshots of the Wireshark capture below shows the packets generated by a ping being issued from a PC host to its default gateway. Step 3: Examine Ethernet frames in a Wireshark capture. : Saturday, Septem11:08:36 AMĭefault Gateway. : Intel(R) 82579LM Gigabit Network Connection In this example, this PC host IP address is 192.168.1.147 and the default gateway has an IP address of 192.168.1.1. Type Data FCS 8 Bytes 6 Bytes 6 Bytes 2 Bytes 46 – 1500 Bytes 4 Bytes Step 2: Examine the network configuration of the PC.

Step 1: Review the Ethernet II header field descriptions and lengths. A Wireshark capture will be used to examine the contents in those fields. In Part 1, you will examine the header fields and content in an Ethernet II frame.

1 PC (Windows with internet access and with Wireshark installed) Instructions Part 1: Examine the Header Fields in an Ethernet II Frame.

The screenshots in this lab were taken from Wireshark v2.4.3 for Windows 10 (64bit). It also assumes that Wireshark has been pre-installed on the PC. Instructor Note: This lab assumes that the student is using a PC with internet access. In Part 2, you will use Wireshark to capture and analyze Ethernet II frame header fields for local and remote traffic. In the first part of this lab, you will review the fields contained in an Ethernet II frame. When learning about Layer 2 concepts, it is helpful to analyze frame header information. For example, if the upper layer protocols are TCP and IP and the media access is Ethernet, then the Layer 2 frame encapsulation will be Ethernet II. The frame composition is dependent on the media access type. When upper layer protocols communicate with each other, data flows down the Open Systems Interconnection (OSI) layers and is encapsulated into a Layer 2 frame.

Part 2: Use Wireshark to Capture and Analyze Ethernet Frames Background / Scenario.

Part 1: Examine the Header Fields in an Ethernet II Frame.

7.1.6 Lab – Use Wireshark to Examine Ethernet Frames Topology