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Paradise Valley Community College *

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Oct 30, 2023

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10/28/23, 7:26 PM 16.5.2 Lab - Secure Netw ork Devices about:blank 1/6 Lab - Secure Network Devices Topology Addressing Table Device Interface IP Address Subnet Mask Default Gateway R1 G0/0/1 192.168.1.1 255.255.255.0 N/A S1 VLAN 1 192.168.1.11 255.255.255.0 192.168.1.1 PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1 Objectives Part 1: Configure Basic Device Settings Part 2: Configure Basic Security Measures on the Router Part 3: Configure Basic Security Measures on the Switch Background / Scenario It is recommended that all network devices be configured with at least a minimum set of best practice security commands. This includes end user devices, servers, and network devices, such as routers and switches. In this lab, you will configure the network devices in the topology to accept SSH sessions for remote management. You will also use the IOS CLI to configure common, basic best practice security measures. You will then test the security measures to verify that they are properly implemented and working correctly. 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. Required Resources  1 Router (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)  2013 - 2020 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 1 6 www.netacad.com

10/28/23, 7:26 PM 16.5.2 Lab - Secure Netw ork Devices about:blank 2/6 Lab - Secure Network Devices  1 PC (Windows with a 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 Instructions Part 1: Configure Basic Device Settings In Part 1, you will set up the network topology and configure basic settings, such as the interface IP addresses, device access, and passwords on the devices. Step 1: Cable the network as shown in the topology. Attach the devices shown in the topology and cable as necessary. Step 2: Initialize and reload the router and switch. Step 3: Configure the router and switch. Open configuration window a. Console into the device and enable privileged EXEC mode. b. Assign the device name according to the Addressing Table. c. Disable DNS lookup to prevent the router from attempting to translate incorrectly entered commands as though they were hostnames. d. Assign class as the privileged EXEC encrypted password. e. Assign cisco as the console password and enable login. f. Assign cisco as the VTY password and enable login. g. Create a banner that warns anyone accessing the device that unauthorized access is prohibited. h. Configure and activate the G0/0/1 interface on the router using the information contained in the Addressing Table. i. Configure the default SVI on the switch with the IP address information according to the Addressing Table. j. Save the running configuration to the startup configuration file. Close configuration window Step 4: Configure PC-A. Open command prompt a. Configure PC-A with an IP address and subnet mask. b. Configure a default gateway for PC-A. Close command prompt Step 5: Verify network connectivity. Open configuration window Ping R1 and S1 from PC-A. If any of the pings fail, troubleshoot the connection. Close configuration window Part 2: Configure Basic Security Measures on the Router Step 1: Configure security measures. Open configuration window a. Encrypt all clear-text passwords. b. Configure the system to require a minimum 12-character password. c. Change the passwords (privileged exec, console, and vty) to meet the new length requirement.  2013 - 2020 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 2 6 www.netacad.com

10/28/23, 7:26 PM 16.5.2 Lab - Secure Netw ork Devices about:blank 3/6 Lab - Secure Network Devices 1) Set the privileged exec password to $cisco!PRIV* 2) Set the console password to $cisco!!CON* 3) Set the vty line password to $cisco!!VTY* d. Configure the router to accept only SSH connections from remote locations 1) Configure the username SSHadmin with an encrypted password of 55HAdm!n2020 2) The router’s domain name should be set to ccna-lab.com 3) The key modulus should be 1024 bits. e. Set security and best-practice configurations on the console and vty lines. 1) Users should be disconnected after 5 minutes of inactivity. 2) The router should not allow vty logins for 2 minutes if 3 failed login attempts occur within 1 minute. Close configuration window Part 3: Configure security measures. Step 1: Verify that all unused ports are disabled. Router ports are disabled by default, but it is always prudent to verify that all unused ports are in an administratively down state. This can be quickly checked by issuing the show ip interface brief command. Any unused ports that are not in an administratively down state should be disabled using the command in interface configuration mode. shutdown Open configuration window Close configuration window Step 2: Verify that your security measures have been implemented correctly. Open configuration window a. Use Tera Term on PC-A to telnet to R1. Question: Does R1 accept the Telnet connection? Explain. No, the connection is refused. Telnet was disabled with the transport input ssh command. Type your answers here. b. Use Tera Term on PC-A to SSH to R1. Question: Does R1 accept the SSH connection? Yes Type your answers here. c. Intentionally mistype the user and password information to see if login access is blocked after two attempts. Question: What happened after you failed to login the second time? The connection to R1 was disconnected. If you attempt to reconnect within 30 seconds, the connection will be refused. d. From your console session on the router, issue the command to view the login show login status. In the example below, the command was issued within the 120 second show login login blocking period and shows that the router is in Quiet-Mode. The router will not accept any login attempts for 111 more seconds. e. After the 120 seconds has expired, SSH to R1 again and login using the SSHadmin username and 55HAdm!n2020 for the password. Question: After you successfully logged in, what was displayed?  2013 - 2020 Cisco and/or its affiliates. All rights reserved. Cisco Public Page of 3 6 www.netacad.com

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