Lab 10 Report

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Northern Kentucky University *

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247

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Computer Science

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Feb 20, 2024

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[Student’s Name] [Lab Partner’s Name*] [Instructor’s Name] CIT 247 [Date of Submission] CIT 247 Lab 10: IPv6 Addressing Instructions: Please answer the questions below and include screenshots when requested. When you are finished, add your last name or NKU username to the beginning of this document’s filename. After this, upload this lab report alongside your GNS3 work to Canvas. *If you worked with a lab partner, please add his or her name after yours and separate the names with a semicolon. If not, simply delete the partner’s placeholder text. Questions: Q1.1: What are the IPv6 addresses configured on the PCs? You may type them out or use screenshots to answer. Q1.2: What IPv6 address type is configured on the PCs? Please explain how they were generated with EUI-64, starting with the MAC address of one of the PCs. Pages 560 to 561 of your textbook will be helpful here. (4 sentences required) The EUI-64 format for IPv6 addresses is derived from a 48-bit MAC address. This MAC address

is split into two segments: the first 24 bits as the Organizationally Unique Identifier and the latter 24 bits as the NIC specific part. A 16-bit sequence, 0xFFFE, is then inserted between these two halves to create a 64-bit EUI address. Following this, the seventh bit in the interface ID portion is modified to complete the process. Q1.3: What are the IPv6 addresses configured on the two router interfaces? What are their IPv6 address types? Each interface should have two IPv6 addresses. The IPv6 addresses configured on the router interfaces are: FastEthernet0/0: fe80::250:79ff:fe66:6800/64 fd00:1:1:1:2050:79ff:fe66:6800/64 FastEthernet0/1: fe80::250:79ff:fe66:6801/64 fd00:1:1:2:2050:79ff:fe66:6801/64 Q2.1: List the new IPv6 addresses on the PCs (they should start with FD). These will be different than the ones in your answer to Q1.1. You may type out the addresses or use screenshots to answer. Q2.2: Please explain the specific purposes of the IPv6 addresses that start with FE80 and FD.

FE80 addresses are designated for local network communication only, while FD addresses are visible and reachable beyond the local network, allowing communication with external networks. Q2.3: Explain how these new addresses were generated on the PCs. List the IPv6 NDP and EUI-64 steps that occurred in their creation. Please use one of the PCs for your explanation (e.g., use that PCs MAC and IPv6 addresses for your explanation). (5 sentences required) The IPv6 address generation using EUI-64 on a PC involves several steps, starting with the PC's MAC address, for example, 00:50:79:66:68:01. This MAC address is divided into two halves: 00:50:79 and 66:68:01. In the next step, the hexadecimal value FFFE is inserted between these halves to create a 64-bit value, resulting in 00:50:79FF:FE66:68:01. The seventh bit of the first byte of this 64-bit address is then flipped, which is a part of the EUI-64 process. Finally, this modified 64-bit value is appended to the local network's IPv6 prefix to generate the full IPv6 address for the PC. Q2.4: Provide a screenshot of the ping test to PC-2 succeeding. Q2.5: Provide a screenshot of the show command used and the router’s IPv6 connected routes. Q2.6: Explain the routing logic that allowed the ping from PC-1 to PC-2 to succeed. Because the routing logic between IPv4 and IPv6 is very similar, refer to the materials and your lab answers in the Router Configuration module to help you form your answer. To save time, you can limit your discussion to the echo request logic. (3 sentences required)

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When PC1 pings PC2 within the same subnet, the process is direct and efficient. The Address Resolution Protocol (ARP) allows PC1 to find PC2's MAC address using its IP, enabling direct communication. PC2 then receives the echo request and responds with an echo reply, completing the ping without complex routing. Q2.7: Explain why the first test succeeded but the second one did not. Consider the type of IPv6 address that was used. The second did not succeed because the address used only allows for one echo request in network

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