Module 7 Labs

pdf

School

University of Missouri, Columbia *

*We aren’t endorsed by this school

Course

221

Subject

Information Systems

Date

Oct 30, 2023

Type

pdf

Pages

Uploaded by joelpinto923

© 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 1 of 7 www.netacad.com Lab - Use Wireshark to Examine Ethernet Frames Topology Objectives Part 1: Examine the Header Fields in an Ethernet II Frame Part 2: Use Wireshark to Capture and Analyze Ethernet Frames Background / Scenario 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. The frame composition is dependent on the media access type. 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. This is typical for a LAN environment. When learning about Layer 2 concepts, it is helpful to analyze frame header information. In the first part of this lab, you will review the fields contained in an Ethernet II frame. In Part 2, you will use Wireshark to capture and analyze Ethernet II frame header fields for local and remote traffic. Required Resources • 1 PC (Windows with internet access and with Wireshark installed) Instructions Part 1: Examine the Header Fields in an Ethernet II Frame In Part 1, you will examine the header fields and content in an Ethernet II frame. A Wireshark capture will be used to examine the contents in those fields. Step 1: Review the Ethernet II header field descriptions and lengths. Preamble Destination Address Source Address Frame 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. 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. C:\> ipconfig /all

Lab - Use Wireshark to Examine Ethernet Frames © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 2 of 7 www.netacad.com Ethernet adapter Ethernet: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Intel(R) 82579LM Gigabit Network Connection Physical Address. . . . . . . . . : F0-1F-AF-50-FD-C8 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::58c5:45f2:7e5e:29c2%11(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.1.147(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Friday, September 6, 2019 11:08:36 AM Lease Expires . . . . . . . . . . : Saturday, September 7, 2019 11:08:36 AM Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 <output omitted> Step 3: Examine Ethernet frames in a Wireshark capture. The screenshots of the Wireshark capture below shows the packets generated by a ping being issued from a PC host to its default gateway. A filter has been applied to Wireshark to view the ARP and ICMP protocols only. ARP stands for address resolution protocol. ARP is a communication protocol that is used for determining the MAC address that is associated with the IP address. The session begins with an ARP query and reply for the MAC address of the gateway router, followed by four ping requests and replies. This screenshot highlights the frame details for an ARP request.

Lab - Use Wireshark to Examine Ethernet Frames © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 3 of 7 www.netacad.com This screenshot highlights the frame details for an ARP reply.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Lab - Use Wireshark to Examine Ethernet Frames © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 4 of 7 www.netacad.com Step 4: Examine the Ethernet II header contents of an ARP request. The following table takes the first frame in the Wireshark capture and displays the data in the Ethernet II header fields. Field Value Description Preamble Not shown in capture This field contains synchronizing bits, processed by the NIC hardware. Destination Address Source Address Broadcast (ff:ff:ff:ff:ff:ff) Netgear_99:c5:72 (30:46:9a:99:c5:72) Layer 2 addresses for the frame. Each address is 48 bits long, or 6 octets, expressed as 12 hexadecimal digits, 0- 9,A-F . A common format is 12:34:56:78:9A:BC . The first six hex numbers indicate the manufacturer of the network interface card (NIC), the last six hex numbers are the serial number of the NIC. The destination address may be a broadcast, which contains all ones, or a unicast. The source address is always unicast. Frame Type 0x0806 For Ethernet II frames, this field contains a hexadecimal value that is used to indicate the type of upper-layer protocol in the data field. There are numerous upper-layer protocols supported by Ethernet II. Two common frame types are these: Value Description 0x0800 IPv4 Protocol 0x0806 Address Resolution Protocol (ARP) Data ARP Contains the encapsulated upper-level protocol. The data field is between 46 – 1,500 bytes. FCS Not shown in capture Frame Check Sequence, used by the NIC to identify errors during transmission. The value is computed by the sending device, encompassing frame addresses, type, and data field. It is verified by the receiver. What is significant about the contents of the destination address field? Type your answers here. Why does the PC send out a broadcast ARP prior to sending the first ping request? Type your answers here. What is the MAC address of the source in the first frame? Type your answers here.

Lab - Use Wireshark to Examine Ethernet Frames © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 5 of 7 www.netacad.com What is the Vendor ID (OUI) of the Source NIC in the ARP reply? Type your answers here. What portion of the MAC address is the OUI? Type your answers here. What is the NIC serial number of the source? Type your answers here. Part 2: Use Wireshark to Capture and Analyze Ethernet Frames In Part 2, you will use Wireshark to capture local and remote Ethernet frames. You will then examine the information that is contained in the frame header fields. Step 1: Determine the IP address of the default gateway on your PC. Open a Windows command prompt. Open a command prompt window and issue the ipconfig command. What is the IP address of the PC default gateway? Type your answers here. Close a Windows command prompt. Step 2: Start capturing traffic on your PC NIC. a. Open Wireshark to start data capture. b. Observe the traffic that appears in the packet list window. Step 3: Filter Wireshark to display only ICMP traffic. You can use the filter in Wireshark to block visibility of unwanted traffic. The filter does not block the capture of unwanted data; it only filters what you want to display on the screen. For now, only ICMP traffic is to be displayed. In the Wireshark Filter box, type icmp . The box should turn green if you typed the filter correctly. If the box is green, click Apply (the right arrow) to apply the filter. Step 4: From the command prompt window, ping the default gateway of your PC. Open a Windows command prompt. From the command window, ping the default gateway using the IP address that you recorded in Step 1. Close Windows command prompt. Step 5: Stop capturing traffic on the NIC. Click the Stop Capturing Packets icon to stop capturing traffic. Step 6: Examine the first Echo (ping) request in Wireshark. The Wireshark main window is divided into three sections: the packet list pane (top), the Packet Details pane (middle), and the Packet Bytes pane (bottom). If you selected the correct interface for packet capturing previously, Wireshark should display the ICMP information in the packet list pane of Wireshark. a. In the packet list pane (top section), click the first frame listed. You should see Echo (ping) request under the Info heading. The line should now be highlighted.

Lab - Use Wireshark to Examine Ethernet Frames © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 6 of 7 www.netacad.com b. Examine the first line in the packet details pane (middle section). This line displays the length of the frame. c. The second line in the packet details pane shows that it is an Ethernet II frame. The source and destination MAC addresses are also displayed. Questions: What is the MAC address of the PC NIC? Type your answers here. What is the default gateway’s MAC address? Type your answers here. d. You can click the greater than (>) sign at the beginning of the second line to obtain more information about the Ethernet II frame. Question: What type of frame is displayed? Type your answers here. e. The last two lines displayed in the middle section provide information about the data field of the frame. Notice that the data contains the source and destination IPv4 address information. Questions: What is the source IP address? Type your answers here. What is the destination IP address? Type your answers here. f. You can click any line in the middle section to highlight that part of the frame (hex and ASCII) in the Packet Bytes pane (bottom section). Click the Internet Control Message Protocol line in the middle section and examine what is highlighted in the Packet Bytes pane. Question: What do the last two highlighted octets spell? Type your answers here. g. Click the next frame in the top section and examine an Echo reply frame. Notice that the source and destination MAC addresses have reversed, because this frame was sent from the default gateway router as a reply to the first ping. Question: What device and MAC address is displayed as the destination address? Type your answers here. Step 7: Capture packets for a remote host. a. Click the Start Capture icon to start a new Wireshark capture. You will receive a popup window asking if you would like to save the previous captured packets to a file before starting a new capture. Click Continue without Saving . Open a Windows command prompt.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Lab - Use Wireshark to Examine Ethernet Frames © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 7 of 7 www.netacad.com b. In a command prompt window, ping www.cisco.com. Close a Windows command prompt. c. Stop capturing packets. d. Examine the new data in the packet list pane of Wireshark. Questions: In the first echo (ping) request frame, what are the source and destination MAC addresses? Source : Type your answers here. Destination : Type your answers here. What are the source and destination IP addresses contained in the data field of the frame? Source : Type your answers here. Destination : Type your answers here. Compare these addresses to the addresses you received in Step 6. The only address that changed is the destination IP address. Why has the destination IP address changed, while the destination MAC address remained the same? Type your answers here. Reflection Question Wireshark does not display the preamble field of a frame header. What does the preamble contain? Type your answers here. End of Document

© 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 1 of 6 www.netacad.com Lab - View Network Device MAC Addresses Topology Addressing Table Device Interface IP Address Subnet Mask Default Gateway S1 VLAN 1 192.168.1.2 255.255.255.0 N/A PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1 Objectives Part 1: Configure Devices and Verify Connectivity Part 2: Display, Describe, and Analyze Ethernet MAC Addresses Background / Scenario Every device on an Ethernet LAN is identified by a Layer 2 MAC address. This address is assigned by the manufacturer and stored in the firmware of the NIC. This lab will explore and analyze the components that make up a MAC address, and how you can find this information on a switch and a PC. You will cable the equipment as shown in the topology. You will configure the switch and PC to match the addressing table. You will verify your configurations by testing for network connectivity. After the devices have been configured and network connectivity has been verified, you will use various commands to retrieve information from the devices to answer questions about your network equipment. Note : The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.2(2) (lanbasek9 image). Other switches and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and the output produced might vary from what is shown in the labs. Note : Make sure that the switches have been erased and have no startup configurations. If you are unsure, ask your instructor. Required Resources • 1 Switch (Cisco 2960 with Cisco IOS Release 15.2(2) lanbasek9 image or comparable) • 1 PC (Windows with a terminal emulation program, such as Tera Term) • Console cable to configure the Cisco switch via the console ports • Ethernet cables as shown in the topology

Lab - View Network Device MAC Addresses © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 2 of 6 www.netacad.com Instructions Part 1: Configure Devices and Verify Connectivity In this part, you will set up the network topology and configure basic settings, such as the interface IP addresses and device name. For device name and address information, refer to the Topology and Addressing Table. Step 1: Cable the network as shown in the topology. a. Attach the devices shown in the topology and cable as necessary. b. Power on all the devices in the topology. Step 2: Configure the IPv4 address for the PC. a. Configure the IPv4 address, subnet mask, and default gateway address for PC-A. b. From the command prompt on PC-A, ping the switch address. Open a Windows command prompt Question: Were the pings successful? Explain. Type your answers here. Close a Windows command prompt Step 3: Configure basic settings for the switch. In this step, you will configure the device name and the IP address, and disable DNS lookup on the switch. a. Console into the switch and enter global configuration mode. Open a configuration window. Switch> enable Switch# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)# b. Assign a hostname to the switch based on the Addressing Table. Switch(config)# hostname S1 c. Disable DNS lookup. S1(config)# no ip domain-lookup d. Configure and enable the SVI interface for VLAN 1. S1(config)# interface vlan 1 S1(config-if)# ip address 192.168.1.2 255.255.255.0 S1(config-if)# no shutdown S1(config-if)# end *Mar 1 00:07:59.048: %SYS-5-CONFIG_I: Configured from console by console Close a configuration window Step 4: Verify network connectivity. Open a Windows command prompt. Ping the switch from PC-A. Question: Were the pings successful? Type your answers here.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Lab - View Network Device MAC Addresses © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 3 of 6 www.netacad.com Every device on an Ethernet LAN has a MAC address that is assigned by the manufacturer and stored in the firmware of the NIC. Ethernet MAC addresses are 48-bits long. They are displayed using six sets of hexadecimal digits that are usually separated by dashes, colons, or periods. The following example shows the same MAC address using the three different notation methods: 00-05-9A-3C-78-00 00:05:9A:3C:78:00 0005.9A3C.7800 Note : MAC addresses are also called physical addresses, hardware addresses, or Ethernet hardware addresses. You will issue commands to display the MAC addresses on a PC and a switch, and analyze the properties of each one. Step 5: Analyze the MAC address for the PC-A NIC. Before you analyze the MAC address on PC-A, look at an example from a different PC NIC. You can issue the ipconfig /all command to view the MAC address of your NIC. An example screen output is shown below. When using the ipconfig /all command, notice that MAC addresses are referred to as physical addresses. Reading the MAC address from left to right, the first six hex digits refer to the vendor (manufacturer) of this device. These first six hex digits (3 bytes) are also known as the organizationally unique identifier (OUI). This 3-byte code is assigned to the vendor by the IEEE organization. To find the manufacturer, use the keywords IEEE OUI standards to find an OUI lookup tool on the internet or navigate to http://standards-oui.ieee.org/oui.txt to find the registered OUI vendor codes. The last six digits are the NIC serial number assigned by the manufacturer. a. Using the output from the ipconfig /all command, answer the following questions. C:\> ipconfig /all <output omitted> Ethernet adapter Ethernet: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Intel(R) 82577LM Gigabit Network Connection Physical Address. . . . . . . . . : 5C-26-0A-24-2A-60 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::b875:731b:3c7b:c0b1%10(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.1.147(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Friday, September 6, 2019 11:08:36 AM Lease Expires . . . . . . . . . . : Saturday, September 7, 2019 11:08:36 AM Default Gateway . . . . . . . . . : 192.168.1.1 <output omitted> Questions: What is the OUI portion of the MAC address for this device? Type your answers here. What is the serial number portion of the MAC address for this device? Type your answers here. Using the example above, find the name of the vendor that manufactured this NIC. Type your answers here.

Lab - View Network Device MAC Addresses © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 4 of 6 www.netacad.com b. From the command prompt on PC-A, issue the ipconfig /all command and identify the OUI portion of the MAC address for the NIC of PC-A. Type your answers here. Identify the serial number portion of the MAC address for the NIC of PC-A. Type your answers here. Identify the name of the vendor that manufactured the NIC of PC-A. Type your answers here. Step 6: Analyze the MAC address for the S1 F0/6 interface. You can use a variety of commands to display MAC addresses on the switch. a. Console into S1 and use the show interfaces vlan 1 command to find the MAC address information. A sample is shown below. Use output generated by your switch to answer the questions. Open a configuration window S1# show interfaces vlan 1 Vlan1 is up, line protocol is up Hardware is EtherSVI, address is 001b.0c6d.8f40 (bia 001b.0c6d.8f40) Internet address is 192.168.1.2/24 MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not supported ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:14:51, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 IP multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 34 packets output, 11119 bytes, 0 underruns 0 output errors, 2 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out Question: What is the MAC address for VLAN 1 on S1? Type your answers here. What is the MAC serial number for VLAN 1? Type your answers here. Type your answers here.

Lab - View Network Device MAC Addresses © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 5 of 6 www.netacad.com What does bia stand for? Type your answers here. Why does the output show the same MAC address twice? Type your answers here. b. Another way to display the MAC address on the switch is to use the show arp command. Use the show arp command to display MAC address information. This command maps the Layer 2 address to its corresponding Layer 3 address. A sample is shown below. Use output generated by your switch to answer the questions. S1# show arp Protocol Address Age (min) Hardware Addr Type Interface Internet 192.168.1.2 - 001b.0c6d.8f40 ARPA Vlan1 Internet 192.168.1.3 0 5c26.0a24.2a60 ARPA Vlan1 What Layer 2 addresses are displayed on S1? Type your answers here. What Layer 3 addresses are displayed on S1? Type your answers here. Step 7: View the MAC addresses on the switch. Issue the show mac address-table command on S1. A sample is shown below. Use output generated by your switch to answer the questions. S1# show mac address-table Mac Address Table ------------------------------------------- Vlan Mac Address Type Ports ---- ----------- -------- ----- All 0100.0ccc.cccc STATIC CPU All 0100.0ccc.cccd STATIC CPU All 0180.c200.0000 STATIC CPU All 0180.c200.0001 STATIC CPU All 0180.c200.0002 STATIC CPU All 0180.c200.0003 STATIC CPU All 0180.c200.0004 STATIC CPU All 0180.c200.0005 STATIC CPU All 0180.c200.0006 STATIC CPU All 0180.c200.0007 STATIC CPU All 0180.c200.0008 STATIC CPU All 0180.c200.0009 STATIC CPU All 0180.c200.000a STATIC CPU All 0180.c200.000b STATIC CPU All 0180.c200.000c STATIC CPU

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Lab - View Network Device MAC Addresses © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 6 of 6 www.netacad.com All 0180.c200.000d STATIC CPU All 0180.c200.000e STATIC CPU All 0180.c200.000f STATIC CPU All 0180.c200.0010 STATIC CPU All ffff.ffff.ffff STATIC CPU 1 5c26.0a24.2a60 DYNAMIC Fa0/6 Total Mac Addresses for this criterion: 21 Question: Did the switch display the MAC address of PC-A? If you answered yes, what port was it on? Type your answers here. Reflection QuestionsCan you have broadcasts at the Layer 2 level? If so, what would the MAC address be? Type your answers here. 1. Why would you need to know the MAC address of a device? Type your answers here. End of Document

© 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 1 of 5 www.netacad.com Lab - View the Switch MAC Address Table Topology Addressing Table Device Interface IP Address Subnet Mask S1 VLAN 1 192.168.1.11 255.255.255.0 S2 VLAN 1 192.168.1.12 255.255.255.0 PC-A NIC 192.168.1.1 255.255.255.0 PC-B NIC 192.168.1.2 255.255.255.0 Objectives Part 1: Build and Configure the Network Part 2: Examine the Switch MAC Address Table Background / Scenario The purpose of a Layer 2 LAN switch is to deliver Ethernet frames to host devices on the local network. The switch records host MAC addresses that are visible on the network, and maps those MAC addresses to its own Ethernet switch ports. This process is called building the MAC address table. When a switch receives a frame from a PC, it examines the frame’s source and destination MAC addresses. The source MAC address is recorded and mapped to the switch port from which it arrived. Then the destination MAC address is looked up in the MAC address table. If the destination MAC address is a known address, then the frame is forwarded out of the corresponding switch port associated with that MAC address. If the MAC address is unknown, then the frame is broadcasted out of all switch ports, except the one from which it came. It is important to observe and understand the function of a switch and how it delivers data on the network. The way a switch operates has implications for network administrators whose job it is to ensure secure and consistent network communication. Switches are used to interconnect and deliver information to computers on local area networks. Switches deliver Ethernet frames to host devices identified by network interface card MAC addresses.

Lab - View the Switch MAC Address Table © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 2 of 5 www.netacad.com In Part 1, you will build a multi-switch topology with a trunk linking the two switches. In Part 2, you will ping various devices and observe how the two switches build their MAC address tables. Note : The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.2(2) (lanbasek9 image). Other switches and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and output produced might vary from what is shown in the labs. Note : Make sure that the switches have been erased and have no startup configurations. If you are unsure contact your instructor. Required Resources • 2 Switches (Cisco 2960 with Cisco IOS Release 15.2(2) lanbasek9 image or comparable) • 2 PCs (Windows with terminal emulation program, such as Tera Term) • Console cables to configure the Cisco IOS devices via the console ports • Ethernet cables as shown in the topology Note : The Fast Ethernet interfaces on Cisco 2960 switches are autosensing and an Ethernet straight-through cable may be used between switches S1 and S2. If using another model Cisco switch, it may be necessary to use an Ethernet crossover cable. Instructions Part 1: Build and Configure the Network Step 1: Cable the network according to the topology. Step 2: Configure PC hosts. Step 3: Initialize and reload switches as necessary. Step 4: Configure basic settings for each switch. Open configuration window a. Configure device name as shown in the topology. b. Configure IP address as listed in Addressing Table. c. Assign cisco as the console and vty passwords. d. Assign class as the privileged EXEC password. Close configuration window Part 2: Examine the Switch MAC Address Table A switch learns MAC addresses and builds the MAC address table, as network devices initiate communication on the network. Step 1: Record network device MAC addresses. a. Open a command prompt on PC-A and PC-B and type ipconfig /all . Open Windows command prompt Question: What are the Ethernet adapter physical addresses? PC-A MAC Address: Type your answers here. PC-B MAC Address: Close Windows command prompt

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Lab - View the Switch MAC Address Table © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 3 of 5 www.netacad.com b. Console into switch S1 and S2 and type the show interface F0/1 command on each switch. Open a configuration window Questions: On the second line of command output, what is the hardware addresses (or burned-in address [bia])? S1 Fast Ethernet 0/1 MAC Address: Type your answers here. S2 Fast Ethernet 0/1 MAC Address: Type your answers here. Close a configuration window Step 2: Display the switch MAC address table. Console into switch S2 and view the MAC address table, both before and after running network communication tests with ping. a. Establish a console connection to S2 and enter privileged EXEC mode. Open a configuration window b. In privileged EXEC mode, type the show mac address-table command and press Enter. S2# show mac address-table Even though there has been no network communication initiated across the network (i.e., no use of ping), it is possible that the switch has learned MAC addresses from its connection to the PC and the other switch. Questions: Are there any MAC addresses recorded in the MAC address table? Type your answers here. What MAC addresses are recorded in the table? To which switch ports are they mapped and to which devices do they belong? Ignore MAC addresses that are mapped to the CPU. Type your answers here. If you had not previously recorded MAC addresses of network devices in Step 1, how could you tell which devices the MAC addresses belong to, using only the output from the show mac address-table command? Does it work in all scenarios? Type your answers here.

Lab - View the Switch MAC Address Table © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 4 of 5 www.netacad.com Step 3: Clear the S2 MAC address table and display the MAC address table again. a. In privileged EXEC mode, type the clear mac address-table dynamic command and press Enter . S2# clear mac address-table dynamic b. Quickly type the show mac address-table command again. Questions: Does the MAC address table have any addresses in it for VLAN 1? Are there other MAC addresses listed? Type your answers here. Wait 10 seconds, type the show mac address-table command, and press Enter. Are there new addresses in the MAC address table? Type your answers here. Close a configuration window Step 4: From PC-B, ping the devices on the network and observe the switch MAC address table. a. From PC-B, open a command prompt and type arp -a . Open a command prompt Question: Not including multicast or broadcast addresses, how many device IP-to-MAC address pairs have been learned by ARP? Type your answers here. b. From the PC-B command prompt, ping PC-A, S1, and S2. Question: Did all devices have successful replies? If not, check your cabling and IP configurations. Type your answers here. Close a command prompt c. From a console connection to S2, enter the show mac address-table command. Open a configuration window Question: Has the switch added additional MAC addresses to the MAC address table? If so, which addresses and devices? Type your answers here. Close a configuration window Open a command prompt From PC-B, open a command prompt and retype arp -a . Question: Does the PC-B ARP cache have additional entries for all network devices that were sent pings? Type your answers here. Close a command prompt

Lab - View the Switch MAC Address Table © 2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 5 of 5 www.netacad.com Reflection Question On Ethernet networks, data is delivered to devices by their MAC addresses. For this to happen, switches and PCs dynamically build ARP caches and MAC address tables. With only a few computers on the network this process seems fairly easy. What might be some of the challenges on larger networks? Type your answers here. End of Document

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version