CCNA Security PT Practice SBA

Transcription

1 A few things to keep in mind while completing this activity: 1. Do not use the browser Back button or close or reload any Exam windows during the exam. 2. Do not close Packet Tracer when you are done. It will close automatically. 3. Click the Submit Assessment button to submit your work. Introduction In this practice Packet Tracer Skills Based Assessment, you will: configure basic device hardening and secure network management configure a CBAC firewall to implement security policies configure devices to protect against STP attacks and to enable broadcast storm control configure port security and disable unused switch ports configure an IOS IPS configure a ZPF to implement security policies configure a site-to-site IPsec VPN Addressing Table Device Interface IP Address Subnet Mask Gateway DNS server Internet CORP Branch External S0/0/ n/a n/a S0/0/ n/a n/a S0/1/ n/a n/a Fa0/ n/a n/a S0/0/ n/a n/a Fa0/ n/a n/a Fa0/ n/a n/a Fa0/ n/a n/a Fa0/ n/a n/a S0/0/ n/a n/a Fa0/ n/a n/a S0/0/ n/a n/a Fa0/ n/a n/a Public Svr NIC n/a External Web Svr NIC External PC NIC NTP/Syslog Svr NIC DMZ DNS Svr NIC DMZ Web Svr NIC PC0 NIC PC1 NIC Net Admin NIC Admin PC NIC All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 1 of 5

2 Note: Appropriate verification procedures should be taken after each configuration task to ensure that it has been properly implemented. Step 1: Configure Basic Device Hardening for the CORP Router. a. Configure the CORP router to only accept passwords with a minimum length of 10 characters. b. Configure an encrypted privileged level password of ciscoclass. c. Enable password encryption for all clear text passwords in the configuration file. d. Configure the console port and all vty lines with the following requirements: Note: CORP is already configured with the username CORPADMIN and the secret password ciscoccnas. use the local database for login disconnect after being idle for 20 minutes e. Disable the CDP protocol only on the link to the Internet router. Step 2: Configure Secure Network Management for the CORP Router. a. Enable the CORP router: as an NTP client to the NTP/Syslog server to update the router calendar (hardware clock) from the NTP time source to timestamp log messages to send logging messages to the NTP/Syslog server b. Configure the CORP router to accept SSH connections. Use the following guidelines: Note: CORP is already configured with the username SSHAccess and the secret password ciscosshaccess. domain name is theccnas.com RSA encryption key pair using a modulus of 1024 SSH version 2, timeout of 90 seconds, and 2 authentication retries all vty lines accept only SSH connections c. Configure the CORP router with AAA authentication and verify its functionality: AAA authentication using the local database as the default for console line and vty lines access Step 3: Configure Device Hardening for Switch1. a. Access Switch1 with username CORPADMIN, password ciscoccnas, and the enable secret password of ciscoclass. b. Enable storm control for broadcasts on FastEthernet 0/24 with a 50 percent rising suppression level. c. Configure Switch1 to protect against STP attacks. Configure PortFast on FastEthernet ports 0/1 to 0/23. Enable BPDU guard on FastEthernet ports 0/1 to 0/23. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 2 of 5

3 d. Configure port security and disable unused ports. Set the maximum number of learned MAC addresses to 2 on FastEthernet ports 0/1 to 0/23. Allow the MAC address to be learned dynamically and to shutdown the port if a violation occurs. Disable unused ports (Fa0/2-5, Fa0/7-10, Fa0/13-23). Step 4: Configure an IOS IPS on the CORP Router. a. On the CORP router, create a directory in flash named ipsdir. b. Configure the IPS signature storage location to be flash:ipsdir. c. Create an IPS rule named corpips. d. Configure the IOS IPS to use the signature categories. Retire the all signature category and unretire the ios_ips basic category. e. Apply the IPS rule to the Fa0/0 interface. f. Modify the ios_ips basic category. Unretire the echo request signature (signature 2004, subsig 0); enable the signature; modify the signature event-action to produce an alert and to deny packets that match the signature. g. Verify that IPS is working properly. Net Admin in the internal network cannot ping DMZ Web Svr. DMZ Web Svr, however, can ping Net Admin. Step 5: Configure ACLs and CBAC on the CORP Router to Implement the Security Policy. a. Create ACL 12 to implement the security policy regarding the access to the vty lines: Only users connecting from Net Admin and Admin PC are allowed access to the vty lines. b. Create, apply, and verify an extended named ACL (named DMZFIREWALL) to filter incoming traffic to the DMZ. The ACL should be created in the order specified in the following guidelines (Please note, the order of ACL statements is significant only because of the scoring need in Packet Tracer.): 1. HTTP traffic is allowed to DMZ Web Svr. 2. DNS traffic (both TCP and UDP) is allowed to DMZ DNS Svr. 3. All traffic from /24 is allowed to enter the DMZ. 4. FTP traffic from the Branch administrator workstation is allowed to DMZ Web Svr. c. To verify the DMZFIREWALL ACL, complete the following tests: Admin PC in the branch office can access the URL Admin PC can open an FTP session to the DMZ Web Svr with the username cisco and the password cisco; PCB1 cannot open an FTP session to the DMZ Web Svr. Net Admin can open an FTP session to the DMZ Web Svr with the username cisco and the password cisco; and PC1 cannot open an FTP session to the DMZ Web Svr. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 3 of 5

4 d. Create, apply, and verify an extended named ACL (named INCORP) to control access from the Internet into the CORP router. The ACL should be created in the order specified in the following guidelines (Please note, the order of ACL statements is significant only because of the scoring need in Packet Tracer.): 1. Allow HTTP traffic to the DMZ Web Svr. 2. Allow DNS traffic (both TCP and UDP) to the DMZ DNS Svr. 3. Allow SSH traffic from the Branch Office administrator workstation to the Serial 0/0/0 interface on the CORP router. 4. Allow IP traffic from the Branch router serial interface into the CORP router serial interface. 5. Allow IP traffic from the Branch Office LAN to the public IP address range that is assigned to the CORP site ( /28). e. To verify the INCORP ACL, complete the following tests: Admin PC in the branch office can access the URL Admin PC can establish an SSH connection to the CORP router ( ) with the username SSHAccess and password ciscosshaccess PCB1 cannot establish an SSH connection to the CORP router ( ); and External PC cannot establish an SSH connection to the CORP router ( ). f. Create and apply a CBAC inspection rule (named INTOCORP) to inspect ICMP, TCP, and UDP traffic between the CORP internal network and any other network. g. Enable CBAC audit messages to be sent to the syslog server. h. Verify the CBAC firewall configuration. PC1 can access the External Web Svr ( PC1 can establish an SSH connection to the External router with username SSHadmin and password ciscosshpa55. Admin PC in the Branch office can establish an SSH connection to the CORP router with the username SSHAccess and password ciscosshaccess. Step 6: Configure a Zone-Based Policy Firewall on the Branch Router. a. Access the Branch router with username CORPADMIN, password ciscoccnas and the enable secret password of ciscoclass. b. On the Branch router, create the firewall zones. Create an internal zone named BR-IN-ZONE. Create an external zone named BR-OUT-ZONE. c. Define a traffic class and access list. Create an ACL (ACL 110) to permit all protocols from the /27 network to any destination. Create a class map using the option of class map type inspect with the match-all keyword. Match the ACL 110 and name the class map BR-IN-CLASS-MAP. d. Specify firewall policies. Create a policy map named BR-IN-OUT-PMAP. Use the BR-IN-CLASS-MAP class map. Specify the action of inspect for this policy map. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 4 of 5

5 e. Apply the firewall. Create a pair of zones named IN-OUT-ZPAIR with the source as BR-IN-ZONE and destination as BR-OUT-ZONE. Specify the policy map BR-IN-OUT-PMAP for handling the traffic between the two zones. Assign interfaces to the appropriate security zones. f. Verify the ZPF configuration. The Admin PC in the Branch office can access the URLs and The Admin PC in the Branch office can ping the External PC ( ). External PC cannot ping the Admin PC in the Branch office ( ). The Admin PC in Branch office can establish an SSH connection to the CORP router with the username SSHAccess and password ciscosshaccess. If you get the Corp> prompt, then your configuration is correct. Step 7: Configure a Site-to-Site IPsec VPN between the CORP router and the Branch Router. The following tables list the parameters for the ISAKMP Phase 1 Policy and IPsec Phase 2 Policy: ISAKMP Phase 1 Policy Parameters ISAKMP Phase 2 Policy Parameters Key Distribution Method ISAKMP Parameters CORP Router Branch Router Encryption Algorithm AES Transform Set Name VPN-SET VPN-SET Number of Bits 256 Transform Set esp-3des esp-sha-hmac Hash Algorithm SHA-1 Peer Host Name Branch CORP esp-3des esp-sha-hmac Authentication Method Pre-share Peer IP Address Key Exchange DH 2 Encrypted Network / /27 IKE SA Lifetime Crypto Map Name VPN-MAP VPN-MAP ISAKMP Key Vpnpass101 SA Establishment ipsec-isakmp ipsec-isakmp a. Configure an ACL (ACL 120) on the CORP router to identify the interesting traffic. The interesting traffic is all IP traffic between the two LANs ( /28 and /27). b. Configure the ISAKMP Phase 1 properties on the CORP router. The crypto ISAKMP policy is 10. Refer to the ISAKMP Phase 1 Policy Parameters Table for the specific details needed. c. Configure the ISAKMP Phase 2 properties on the CORP router. Refer to the ISAKMP Phase 2 Policy Parameters Table for the specific details needed. d. Bind the VPN-MAP crypto map to the outgoing interface. e. Configure IPsec parameters on the Branch router using the same parameters as on the CORP router. Note that interesting traffic is defined as the IP traffic from the two LANs. f. Save the running-config, then reload both CORP and Branch routers. g. Verify the VPN configuration by conducting an FTP session with the username cisco and the password cisco from the Admin PC to the DMZ Web Svr. On the Branch router, check that the packets are encrypted. To exit the FTP session, type quit. Last updated: September 2012 All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 5 of 5