13.3.2 Lab - Use Ping and Traceroute to Test Network Connectivity

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10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 1/12 Lab - Use Ping and Traceroute to Test Network Connectivity Topology Addressing Table Device Interface IP Address / Prefix Default Gateway R1 G0/0/0 64.100.0.2 /30 N/A R1 G0/0/0 2001:db8:acad::2 /64 N/A R1 G0/0/0 fe80::2 N/A R1 G0/0/1 192.168.1.1 /24 N/A R1 G0/0/1 2001:db8:acad:1::1 /64 N/A R1 G0/0/1 fe80::1 N/A ISP G0/0/0 64.100.0.1 /30 N/A ISP G0/0/0 2001:db8:acad::1 /64 N/A ISP G0/0/0 fe80::1 N/A ISP G0/0/1 209.165.200.225 /27 N/A ISP G0/0/1 2001:db8:acad:200::225 /64 N/A ISP G0/0/1 fe80::225 N/A S1 VLAN 1 192.168.1.2 /24 192.168.1.1 S1 VLAN 1 2001db8:acad:1::2 /64 fe80::1 S1 VLAN 1 fe80::10 fe80::1 PC-A NIC 2001:db8:acad:1::10 /64 fe80::1 PC-A NIC 64.100.0.2 /30 N/A External NIC 209.165.200.226 /27 209.165.200.225 External NIC 2001:DB8:ACAD:200::226 /64 FE80::225  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 1 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity Objectives Part 1: Build and Configure the Network Part 2: Use Ping Command for Basic Network Testing Part 3: Use Tracert and Traceroute Commands for Basic Network Testing Part 4: Troubleshoot the Topology Background / Scenario

10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 2/12  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 1 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity Objectives Part 1: Build and Configure the Network Part 2: Use Ping Command for Basic Network Testing Part 3: Use Tracert and Traceroute Commands for Basic Network Testing Part 4: Troubleshoot the Topology Background / Scenario Ping and traceroute are two tools that are indispensable when testing TCP/IP network connectivity. Ping is a network administration utility used to test the reachability of a device on an IP network. This utility also measures the round-trip time for messages sent from the originating host to a destination computer. The ping utility is available on Windows, Unix-like operating systems (OS), and the Cisco Internetwork Operating System (IOS). The traceroute utility is a network diagnostic tool for displaying the path or route and measuring the transit delays of packets travelling an IP network. The tracert utility is available on Windows, and a similar utility, traceroute, is available on Unix-like OS and Cisco IOS. In this lab, the and commands are examined and command options are explored to modify ping traceroute the command behavior. Cisco devices and PCs are used in this lab for command exploration. The necessary Cisco device configurations are provided in this lab. Note : The routers used with CCNA hands-on labs are Cisco 4221 with Cisco IOS XE Release 16.9.4 (universalk9 image). The switches used in the labs are Cisco Catalyst 2960s with Cisco IOS Release 15.2(2) (lanbasek9 image). Other routers, 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. Refer to the Router Interface Summary Table at the end of the lab for the correct interface identifiers. Note : Make sure that the routers and switches have been erased and have no startup configurations. If you are unsure, contact your instructor. The template used by the Switch Database Manager (SDM) does not provide IPv6 address default bias capabilities. Verify that SDM is using either the template or the dual-ipv4-and-ipv6 lanbase-routing template. The new template will be used after reboot even if the configuration is not saved. S1# show sdm prefer Use the following commands to assign the template as the default SDM template. dual-ipv4-and-ipv6 S1# configure terminal S1(config)# sdm prefer dual-ipv4-and-ipv6 default S1(config)# end S1# reload Required Resources  2 Routers (Cisco 4221 with Cisco IOS XE Release 16.9.4 universal image or comparable)  1 Switch (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 and serial cables as shown in the topology  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 2 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity Instructions Part 1: Build and Configure the Network In Part 1, you will set up the network in the topology and configure the PCs and Cisco devices. The initial configurations for the routers and switches are provided for your reference. In this topology, static routing is used to route packets between networks. Step 1: Cable the network as shown in the topology.

10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 3/12  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 2 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity Instructions Part 1: Build and Configure the Network In Part 1, you will set up the network in the topology and configure the PCs and Cisco devices. The initial configurations for the routers and switches are provided for your reference. In this topology, static routing is used to route packets between networks. Step 1: Cable the network as shown in the topology. Step 2: Erase the configurations on the routers and switches, and reload the devices. Step 3: Configure PC IP addresses and default gateways according to the Addressing Table. Step 4: Configure the R1 and ISP routers and S1 switch using the initial configurations provided below. At the switch or router global configuration mode prompt, copy and paste the configuration for each device. Save the configuration to startup-config. Open configuration window Initial configurations for the R1 router: hostname R1 no ip domain lookup ipv6 unicast-routing interface g0/0/0 ip address 64.100.0.2 255.255.255.252 ipv6 address 2001:db8:acad::2/64 ipv6 address fe80::2 link-local ip nat outside no shutdown interface g0/0/1 ip add 192.168.1.1 255.255.255.0 ipv6 address 2001:db8:acad:1::1/64 ipv6 address fe80::1 link-local ip nat inside no shutdown ip route 0.0.0.0 0.0.0.0 64.100.0.1 ipv6 route 0::/0 2001:db8:acad::1 access-list 1 permit 192.168.1.0 0.0.0.255 ip nat inside source list 1 interface g0/0/0 overload Close configuration window Initial configurations for ISP: Open configuration window hostname ISP no ip domain lookup ipv6 unicast-routing interface g0/0/0 ip address 64.100.0.1 255.255.255.252 ipv6 address 2001:db8:acad::1/64 ipv6 address fe80::1 link-local no shutdown  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 3 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity interface g0/0/1 ip add 209.165.200.225 255.255.255.224 ipv6 address 2001:db8:acad:200::225/64 ipv6 address fe80::225 link-local no shutdown ipv6 route ::/0 2001:db8:acad::2 Close configuration window Initial configurations for S1:

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10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 4/12 no shutdown  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 3 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity interface g0/0/1 ip add 209.165.200.225 255.255.255.224 ipv6 address 2001:db8:acad:200::225/64 ipv6 address fe80::225 link-local no shutdown ipv6 route ::/0 2001:db8:acad::2 Close configuration window Initial configurations for S1: hostname S1 no ip domain-lookup interface vlan 1 ip add 192.168.1.2 255.255.255.0 ipv6 address 2001:db8:acad:1::2/64 ipv6 address fe80::2 link-local no shutdown exit ip default-gateway 192.168.1.1 end Step 5: Configure an IP host table on the R1 router. The IP host table allows you to use a hostname to connect to a remote device rather than an IP address. The host table provides name resolution for the device with the following configurations. Copy and paste the following configurations for the R1 router. The configurations will allow you to use the hostnames for and ping traceroute commands on the R1 router. Open configuration window ip host Externalv4 209.165.200.226 ip host Externalv6 2001:db8:acad:200::226 ip host ISPv4 64.100.0.1 ip host ISPv6 2001:db8:acad::1 ip host PC-Av4 192.168.1.10 ip host PC-Av6 2001:db8:acad:1::10 ip host R1v4 64.100.0.2 ip host R1v6 2001:db8:acad::2 ip host S1v4 192.168.1.2 ip host S1v6 2001:db8:acad:1::2 end close configuration window Part 2: Use Ping Command for Basic Network Testing In Part 2 of this lab, use the command to verify end-to-end connectivity. Ping operates by sending ping Internet Control Message Protocol (ICMP) echo request packets to the target host and then waiting for an ICMP response. It can record the round trip time and any packet loss or routing loops. IP packets have a limited lifetime on the network. IP packets use an 8 bit Time to Live (IPv4) or Hop Limit (IPv6) header field value which specifies the maximum number of layer three hops that can be traversed on the path to their destination. Hosts on a network will set its own 8 bit value with a maximum value of 255. So each time an IP packet arrives at a layer three network device this value is reduced by one before it is forwarded to its destination. So if this value eventually reaches zero the IP packet is discarded.  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 4 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity You will examine the results with the command and the additional ping options that are available on ping Windows-based PCs and Cisco devices. Step 1: Test network connectivity from the R1 network using PC-A. All the pings from PC-A to other devices in the topology should be successful. If they are not, check the topology and the cabling, as well as the configuration of the Cisco devices and the PCs. a. Ping from PC-A to its default gateway using the IPv4 address (R1’s GigabitEthernet 0/0/1 interface). Open command prompt C:\> ping 192.168.1.1

10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 5/12  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 4 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity You will examine the results with the command and the additional ping options that are available on ping Windows-based PCs and Cisco devices. Step 1: Test network connectivity from the R1 network using PC-A. All the pings from PC-A to other devices in the topology should be successful. If they are not, check the topology and the cabling, as well as the configuration of the Cisco devices and the PCs. a. Ping from PC-A to its default gateway using the IPv4 address (R1’s GigabitEthernet 0/0/1 interface). Open command prompt C:\> ping 192.168.1.1 Pinging 192.168.1.1 with 32 bytes of data: Reply from 192.168.1.1: bytes=32 time<1ms TTL=255 Reply from 192.168.1.1: bytes=32 time<1ms TTL=255 Reply from 192.168.1.1: bytes=32 time<1ms TTL=255 Reply from 192.168.1.1: bytes=32 time<1ms TTL=255 Ping statistics for 192.168.1.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms In this example, four (4) ICMP requests, 32 bytes each, were sent and the responses were received in less than one millisecond with no packet loss. The transmission and reply time can increase as the ICMP requests and responses are processed by more devices during the journey to and from the final destination. This can also be done using the IPv6 address of the default gateway (R1’s GigabitEthernet 0/0/1 interface). C:\> ping 2001:db8:acad:1::1 Pinging 2001:db8:acad:1::1 with 32 bytes of data: Reply from 2001:db8:acad:1::1: time=5ms Reply from 2001:db8:acad:1::1: time=1ms Reply from 2001:db8:acad:1::1: time=1ms Reply from 2001:db8:acad:1::1: time=1ms Ping statistics for 2001:db8:acad:1::1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 1ms, Maximum = 5ms, Average = 2ms b. From PC-A, ping the addresses listed in the following table and record the average round trip time and IPv4 Time to Live (TTL) or IPv6 Hop Limit. : Use WireShark to see the IPv6 Hop Limit value. Optional Destination Average Round Trip Time (ms) TTL / Hop Limit 192.168.1.10 3 128 2001:db8:acad:1::10 2 128 192.168.1.1 (R1) 0 255 2001:db8:acad:1::1 (R1) 0 255 192.168.1.2 (S1) 0 255  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 5 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity Destination Average Round Trip Time (ms) TTL / Hop Limit 2001:db8:acad:1::2(S1) blank blank 64.100.0.2 (R1) 0 255 2001:DB8:ACAD::2 (R1) 1 255 64.100.0.1 (ISP) 0 254 2001:DB8:ACAD::1 (ISP) 1 254

10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 6/12 Discover more from: CNET 311 192.168.1.2 (S1) 0 255  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 5 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity Destination Average Round Trip Time (ms) TTL / Hop Limit 2001:db8:acad:1::2(S1) blank blank 64.100.0.2 (R1) 0 255 2001:DB8:ACAD::2 (R1) 1 255 64.100.0.1 (ISP) 0 254 2001:DB8:ACAD::1 (ISP) 1 254 209.165.200.225 (ISP G0/0/1) 0 254 2001:DB8:ACAD:200::225 (ISP G0/0/1) 0 254 209.165.200.226 (External) 7 126 2001:DB8:ACAD:200::226 (External) 1 126 Step 2: Use extended ping commands on PC-A. The default command sends four requests at 32 bytes each. It waits 4,000 milliseconds (4 seconds) for ping each response to be returned before displaying the “Request timed out” message. The command can be ping fine-tuned for troubleshooting a network. a. At the command prompt, type and press Enter. ping C:\> ping b. Using the option, ping External to verify that External is reachable. –t C:\Users\User1> ping –t 209.165.200.226 To illustrate the results when a host is unreachable, disconnect the cable between the ISP router and External, or shut down the GigabitEthernet 0/0/1 interface on the ISP router. While the network is functioning correctly, the command can determine whether the destination ping responded and how long it took to receive a reply from the destination. If a network connectivity problem exists, the command displays an error message. ping Reply from 64.100.0.1: Destination host unreachable. c. Reconnect the Ethernet cable or enable the GigabitEthernet 0/0/1 interface on the ISP router (using the no shutdown command) before moving onto the next step. After about 30 seconds, the ping should be successful again. d. Press to stop the ping command. Ctrl + C e. The above steps can be repeated for IPv6 address to obtain ICMP error message. Question: What ICMP error messages did you receive? Type your answers here. f. Enable the GigabitEthernet 0/0/1 interface on the ISP router (using the command) before no shutdown moving onto the next step. After about 30 seconds, the ping should be successful again. Close command prompt Step 3: Test network connectivity from the R1 network using Cisco devices. The command is also available on Cisco devices. In this step, the command is examined using the ping ping R1 router and the S1 switch. a. Ping External on the external network using the IP address of 209.165.200.226 from the R1 router. R1# ping 209.165.200.226  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 6 11 www.netacad.com Document continues below Routing & Switching 17 documents

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10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 7/12 Discover more from: CNET 311 12.9.2 Lab - Con±gure IPv6 Addresses on Network Devices Routing & Switching 67% (3) 7.2.7 Lab - View Network Device MAC Addresses Routing & Switching 100% (4) 6.8.2 Lab - - Lab Done Routing & Switching None 2.2.13 Packet Tracer - Point-to-Point Single-Area OSPFv 2 Con±guration - ILM Routing & Switching None 2.3.11 Packet Tracer - Determine the DR and BDR - ILM Routing & Switching None Group 5 - lab Routing & Switching None R1# ping 209.165.200.226  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 6 11 www.netacad.com Document continues below Routing & Switching 17 documents Go to course 4 6 11 4 4 19 Lab - Use Ping and Traceroute to Test Network Connectivity Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 209.165.200.226, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms The exclamation point (!) indicates that the ping was successful from the R1 router to External. The round trip takes an average of 1 ms with no packet loss, as indicated by a 100% success rate. b. Because a local host table was configured on the R1 router, you can ping Externalv4 on the external network using the hostname configured from the R1 router.

10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 8/12 Group 5 - lab Routing & Switching None 4 19 Lab - Use Ping and Traceroute to Test Network Connectivity Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 209.165.200.226, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms The exclamation point (!) indicates that the ping was successful from the R1 router to External. The round trip takes an average of 1 ms with no packet loss, as indicated by a 100% success rate. b. Because a local host table was configured on the R1 router, you can ping Externalv4 on the external network using the hostname configured from the R1 router. Note : The hostname is not case-sensitive. You can substitute the hostname for the IP address if desired on R1 in this lab. R1# ping externalv4 Question: What is the IP address used? Type your answers here. c. There are more options available for the command. At the CLI, type and press Enter. Use ping ping ipv6 as the protocol. Input or for the Target IPv6 address. Press Enter to 2001:DB8:ACAD:200::226 external accept the default value for other options. R1# ping Protocol [ip]: ipv6 Target IPv6 address: 2001:db8:acad:200::226 Repeat count [5]: Datagram size [100]: Timeout in seconds [2]: Extended commands? [no]: Sweep range of sizes? [no]: Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:DB8:ACAD:200::226, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms d. You can use an extended ping to observe when there is a network issue. Start the command to ping 209.165.200.226 with a repeat a count of 50000. Then, disconnect the cable between the ISP router and EXTERNAL or shut down the GigabitEthernet 0/0/1 interface on the ISP router. Reconnect the Ethernet cable or enable the GigabitEthernet 0/0/1 interface on the ISP router after the exclamation points (!) have replaced by the letter U and periods (.). After about 30 seconds, the ping should be successful again. Press to stop the command if desired. Ctrl Shift + + 6 ping R1# ping Protocol [ip]: Target IP address: 209.165.200.226 Repeat count [5]: 10000 Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: Sweep range of sizes [n]: Sending 500, 100-byte ICMP Echos to 209.165.200.226, timeout is 2 seconds: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! <output omitted> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 7 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.U.U.U.U.U. U.U ................ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! <output omitted> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!! Success rate is 99 percent (9970/10000), round-trip min/avg/max = 1/1/10 ms The letter U in the results indicates that a destination is unreachable An error protocol data unit (PDU)

10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 9/12 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 7 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.U.U.U.U.U. U.U ................ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! <output omitted> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!! Success rate is 99 percent (9970/10000), round-trip min/avg/max = 1/1/10 ms The letter U in the results indicates that a destination is unreachable. An error protocol data unit (PDU) was received by the R1 router. Each period (.) in the output indicates that the ping timed out while waiting for a reply from External. In this example, 1% of the packets were lost during the simulated network outage. Note : You can also use the following commands for the same results: R1# ping 209.165.200.226 repeat 10000 or R1# ping 2001:db8:acad:200::226 repeat 10000 Close configuration window The command is extremely useful when troubleshooting network connectivity. However, ping cannot ping indicate the location of problem when a ping is not successful. The (or ) command can tracert traceroute display network latency and path information. Part 3: Use Tracert and Traceroute Commands for Basic Network Testing The commands for tracing routes can be found on PCs and network devices. For a Windows-based PC, the tracert command uses ICMP messages to trace the path to the final destination. The command traceroute utilizes the User Datagram Protocol (UDP) datagrams for tracing routes to the final destination for Cisco devices and other Unix-like PCs. In Part 3, you will examine the traceroute commands and determine the path that a packet travels to its final destination. You will use the command from the Windows PCs and the command from the tracert traceroute Cisco devices. You will also examine the options that are available for fine tuning the traceroute results. Step 1: Use the tracert command from PC-A to EXTERNAL. a. At the command prompt, type . tracert 209.165.200.226 Open a command prompt C:\> tracert 209.165.200.226 The tracert results indicates the path from PC-A to EXTERNAL is from PC-A to R1 to ISP to EXTERNAL. The path to EXTERNAL traveled through two router hops to the final destination of EXTERNAL. Step 2: Explore additional options for the tracert command. a. At the command prompt, type and press Enter to see the available options. tracert C:\> tracert b. Use the option. Notice that the IP address of 209.165.200.226 is not resolved as EXTERNAL. -d C:\> tracert –d 209.165.200.226 Close command prompt Step 3: Use the traceroute command from the R1 router to External. At the command prompt, type or on the R1 traceroute 209.165.200.226 traceroute 2001:db8:acad:200::226 router. The hostnames are resolved because a local IP host table was configured on the R1 router. Open configuration window  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 8 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity R1# traceroute 209.165.200.226 R1# traceroute 2001:db8:acad:200::226 Close configuration window Step 4: Use the traceroute command from the S1 switch to External. On the S1 switch, type traceroute 209.165.200.226 traceroute 2001:db8:acad:200::226 or . The hostnames are not displayed in the traceroute results because a local IP host table was not configured on this switch. Open a configuration window S1# traceroute 209 165 200 226

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10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 10/12  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 8 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity R1# traceroute 209.165.200.226 R1# traceroute 2001:db8:acad:200::226 Close configuration window Step 4: Use the traceroute command from the S1 switch to External. On the S1 switch, type traceroute 209.165.200.226 traceroute 2001:db8:acad:200::226 or . The hostnames are not displayed in the traceroute results because a local IP host table was not configured on this switch. Open a configuration window S1# traceroute 209.165.200.226 S1# traceroute 2001:db8:acad:200::226 Close configuration window The command has additional options. You can use the or just press Enter after typing traceroute ? traceroute at the prompt to explore these options. The following link provides more information regarding the and commands for a Cisco ping traceroute device: http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09186a00800a6057.shtml Part 4: Troubleshoot the Topology Step 1: Copy and paste the following configuration into the ISP router. Open configuration window hostname ISP interface g0/0/0 ip address 64.100.0.1 255.255.255.252 ipv6 address 2001:db8:acad::1/64 no shutdown interface g0/0/1 ip address 192.168.8.1 255.255.255.0 no ipv6 address 2001:db8:acad:200::225/64 ipv6 address 2001:db8:acad:201::225/64 no shutdown end Close configuration window Step 2: From the R1 network, use ping and tracert or traceroute commands to troubleshoot and correct the problem on the ISP network. a. Use the and commands from PC-A. ping tracert You can use the command to determine end-to-end network connectivity. This tracert result tracert indicates that PC-A can reach its default gateway of 192.168.1.1, but PC-A does not have network connectivity with External. Open command prompt One way to locate the network issue is to ping each hop in the network to EXTERNAL. First determine if PC-A can reach the ISP router g0/0/0 interface with an IP address of 64.100.0.1. b. PC-A can reach the ISP router. Based on the successful ping results from PC-A to the ISP router, the network connectivity issue is with 209.165.200.224/24 network. Ping the default gateway to External, which is the GigabitEthernet 0/0/1 interface of the ISP router. PC-A cannot reach the GigabitEthernet 0/0/1 interface of the ISP router, as displayed by the results from the command. ping  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 9 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity The tracert and ping results conclude that PC-A can reach the R1 and ISP routers, but not the External or default gateway for External. Close command prompt c. Use the commands to examine the running configurations for the ISP router. show Open configuration window The outputs of the and commands indicate that the GigabitEthernet show run show ip interface brief 0/0/1 interface is up/up, but was configured with an incorrect IP address. d. Correct the found issues. Close configuration window

10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 11/12 the command. ping  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 9 11 www.netacad.com Lab - Use Ping and Traceroute to Test Network Connectivity The tracert and ping results conclude that PC-A can reach the R1 and ISP routers, but not the External or default gateway for External. Close command prompt c. Use the commands to examine the running configurations for the ISP router. show Open configuration window The outputs of the and commands indicate that the GigabitEthernet show run show ip interface brief 0/0/1 interface is up/up, but was configured with an incorrect IP address. d. Correct the found issues. Close configuration window e. Verify that PC-A can ping and tracert to EXTERNAL. Open command prompt Close command prompt Note : This can also be accomplished using and commands from the CLI on the ISP ping traceroute router and the S1 switch after verifying that there are no network connectivity issues on the 192.168.1.0/24 network. f. Now repeat the process for IPv6 connectivity. : If you find an incorrect IPv6 address, you will need to Note remove it because it is not replaced by a new ipv6 address command. Reflection Questions 1. What could prevent ping or traceroute responses from reaching the originating device beside network connectivity issues? Command no shutdown in interface G0/0/1 in ISP. Type your answers here. 2. If you ping a non-existent address on the remote network, such as 209.165.200.227, what is the message displayed by the command? What does this mean? If you ping a valid host address and receive this ping response, what should you check? Request time out. Type your answers here. 3. If you ping an address that does not exist in any network in your topology, such as 192.168.5.3, from a Windows-based PC, what is the message displayed by the command? What does this message ping indicate? Request time out. Type your answers here. 4. What is the IPv4 TTL value set on the Windows host? What is the IPv4 TTL value set on a Cisco device? 128 Type your answers here. 5. What is the IPv6 Hop Limit value set on the Windows host? What is the IPv6 Hop Limit value set on a Cisco device? 128 Type your answers here. Router Interface Summary Table Router Model Ethernet Interface #1 Ethernet Interface #2 Serial Interface #1 Serial Interface #2 1800 Fast Ethernet 0/0 (F0/0) Fast Ethernet 0/1 (F0/1) Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 10 11 www.netacad.com

10/7/23, 8:24 PM 13.3.2 Lab - Use Ping and Traceroute to Test Netw ork Connectivity about:blank 12/12 1800 (F0/0) (F0/1) Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)  2013 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 10 11 www.netacad.com

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