Lab 2 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 2: Basic Switch Configuration 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: Take one or more screenshots of the PC terminals, showing the configured IP addresses and save commands on all three computers.

Q1.2: Think back to the discussion on broadcast domains in the previous module. Our topology has two switches between two PCs on the left and one PC on the right. Are all these devices in the same broadcast domain (Hint: Consider the addresses we configured on the PCs)? Please explain why. (3 sentences required)

All the devices, namely the PCs, are in the same broadcast domain because they are all interconnected using switches. Switches operate at Layer 2 and do not divide broadcast domains; they just maintain one single broadcast domain unless VLANs are configured. Since the PCs have addresses in the same IP range and are connected via switches, they all belong to the same broadcast domain. Q2.1: Take a screenshot of the results of the command, then either write down or circle the following information in the image: 1) the amount of memory on the switch, 2) the amount of time it has been on, and 3) the number of Ethernet interfaces. Paste the completed screenshot in your lab document. Q2.2: The MAC address table should be empty. Please briefly explain why. The MAC address table is empty because no traffic has been sent through the switch up to this point. Switches populate their MAC address tables dynamically by learning source MAC addresses from frames that pass through them. Q2.3: The MAC address table should have two entries. What devices are associated with the entries? (Hint: Use the show command on the PCs).

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After pinging from PC-1 to PC-2, IOU1 will have learned the MAC addresses of both PCs. The source MAC address would be that of PC-1 and the destination MAC address would be that of PC-2. Q2.4: Please write down the steps that IOU1 used to learn the two entries in the MAC address table. This will require you to explain in detail how switches learn MAC addresses and how they forward frames. Your steps should discuss how ICMP echo requests and replies, MAC addresses, and the MAC address table were involved. Also, please specify whether the source or destination MAC address was involved in each step, as well as the device. 1. PC-1 sends an ICMP echo request to PC-2. 2. The frame carries the source MAC address of PC-1. 3. IOU1 captures this frame and adds the source MAC address to its MAC address table associating it with the port that it came from. 4. Since IOU1 does not have an entry for PC-2's MAC address, it broadcasts the frame out of all its ports except the one it came from. 5. PC-2 responds to the ping with an ICMP echo reply. 6. The frame carries the source MAC address of PC-2. 7. IOU1 captures this frame, learns PC-2’s MAC address, and adds it to the MAC address table. 8. IOU1 now knows the MAC addresses of both PC-1 and PC-2 and their associated ports. Q3.1: What commands did you use on SWITCH1 to configure telnet access (just type the commands you used in Step 13)? line vty 0 4 login local transport input telnet Q3.2: Provide a screenshot of the current terminal. Before taking the screenshot, please expand the terminal’s size to show the commands you used to sign in as well as some of the results of the show command.

Q3.3: Provide a screenshot of the current terminal. Before taking the screenshot, please expand the terminal’s size to show the commands you used to sign in as well as some of the results of the show command.

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