Lab 3 Report

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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 3: VLANs and Trunking 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: Fill out the table below based on the information from the show commands. This information will be used later in the lab. (Note: Please type your answers; do not place images in the table cells). The first two cells are answered for you. PC NAME IP ADDRESS MAC ADDRESS PC-1 192.168.1.1 00:50:79:66:68:00 PC-2 192.168.1.2 00:50:79:66:68:01 PC-3 192.168.2.1 00:50:79:66:68:04 PC-4 192.168.2.2 00:50:79:66:68:07 PC-5 192.168.1.3 00:50:79:66:68:02 PC-6 192.168.1.4 00:50:79:66:68:03 PC-7 192.168.2.3 00:50:79:66:68:06 PC-8 192.168.2.4 00:50:79:66:68:05 Q2.1: Please provide screenshots of the show command’s output on both switches.

Q2.2: On PC-1, ping PC-3. Why did this fail? Please explain in relation to the communication criteria mentioned in Step 5. The ping from PC-1 to PC-3 fails because they are on different VLANs (broadcast domains). Even though they might be in the same IP subnet, without a router to route between VLANs, hosts in different VLANs cannot communicate with each other. Q2.3: Why is trunking required to allow communication between hosts in the same VLAN and subnet but on different switches? What process does trunking provide to allow this communication to happen? Please refer to pages 180-181 in your textbook for details. (3 sentence requirement) Trunking is required to allow communication between hosts in the same VLAN and subnet but on different switches because it allows multiple VLANs' data to travel across the same physical link. Trunking provides the capability to tag each frame with a VLAN identifier (VID), so when it reaches the destination switch, the switch knows to which

VLAN the frame belongs. This process ensures that the frame is only forwarded to ports that belong to the same VLAN as the originating host. Q3.1: What are the Administrative and Operational modes on e0/0? Administrative says: static Operational says: static Q3.2: What is the difference between the Administrative and Operational modes? Refer to the chapter reading and lecture materials for your answer. Administrative mode is the user-defined or manually configured mode of the port, while Operational mode is the current mode of operation that the switch port has negotiated. Q3.3: What are the Administrative and Operational modes on e0/0 now? Administrative says: trunk Operational says: trunk Q3.4: Which VLANs are allowed and active on the trunk? 1-4094 Q3.5: Which VLAN(s) are tagged when their traffic crosses the trunk? Which VLAN(s) are not tagged? Please explain why. (Hint: Consider the concept of the native VLAN). (4 sentence requirement) All VLANs except the native VLAN will be tagged when their traffic crosses the trunk. The native VLAN's traffic will not be tagged. This is because the concept of the native VLAN is to handle untagged traffic. Frames that belong to the native VLAN do not carry a VLAN tag when sent over a trunk. Q3.6: Please fill in the following table with explanations on what happened in each ping test, using proper terminology such as VLAN, subnet (or layer 3 network), and trunk. Each explanation should be at least 3 sentences. PING TEST SUCCESS? (YES / NO) EXPLANATION PC-1 -> PC-5 yes PC-1 and PC-5 are in the same VLAN and subnet. Trunking between switches allows their communication. Frames travel unhindered due to matching VLAN configurations. PC-3 -> PC-7 yes Both PC-3 and PC-7 reside in the same VLAN and subnet. They communicate via the trunked link between switches. Their matching VLAN ensures this successful connection. PC-1 -> PC-8 No PC-1 and PC-8 are in different VLANs. This puts them in

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separate broadcast domains. Without inter-VLAN routing, they can't communicate. PC-3 -> PC-6 No PC-3 and PC-6 belong to different VLANs. This separates their broadcast domains. Direct communication is restricted due to VLAN differences. Q3.7: Which ping test(s) were different from the results in your table? Please explain why. The ping tests that involve devices on VLAN 10 that require traversal between switches will now FAIL because VLAN 10 traffic is not allowed on the trunk. Q3.8: Provide a screenshot showing the ping test succeeding. Q3.9: List the MAC addresses you see associated with e0/0 on IOU1 along with the device that is associated with each MAC address (Hint: Use the table you created in Part 1). 00:50:79:66:68:00 - PC-1 00:50:79:66:68:02 - PC-5 00:50:79:66:68:04 - PC-3 00:50:79:66:68:06 - PC-7

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