Week 2 Guided Practice 2 - DHCP and DNS OL

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Jan 9, 2024

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Introduction to Routing and Switching Lab Week 2 Guided Practice 2 – DHCP and DNS In this guided practice you will be reusing the Packet Tracer file from the first Guided Practice for this week (2.2 VLSM Subnetting). In Packet Tracer you will need to switch to the physical tab (at the top left of the screen) and then drill down to Home city, corporate office, and main wiring closet. You should have the following network in the physical tab of Packet Tracer. If you do not have this network go back to the first Guided Practice for this week (2.2 VLSM Subnetting) and set up the network. Your finished setup should look like the screen below.
Task 1 – Change to EIGRP Routing First you must go in and remove the RIP routing protocol from your network. Go into each router and in configuration mode and type no router rip . Add the EIGRP to each router as follows. R1 R2 R3
Go into router 1 and pull the routing table using the command show ip route . Notice the Ds on the left side denoting the EIGRP protocol. Take a screenshot. You should now be able to ping the internet from any of your PCs by typing. ping 11.1.1.10 Take a screenshot of your successful ping. Deliverables for Task 1 Screenshot of your show ip route table from router 1.
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Screenshot of your ping from PC1 to the Internet
Task 2 – Move DHCP to Server1 Verify that your Server1 system has a static address in the .224 network (if you follow along below .226 is used for sever1). Make a note of the IP address as you will be using it again later. Open you server system and go to the services tab. In the services tab select the DHCP service. You will note that by default the DHCP service is off. Click the On button to turn the service on in the server. Name your first pool VLAN10 and give it the following information. Make the 3 remaining pools for VLANs 20-40 with gateways from the list below.
You should end with the 4 DHCP pools shown below Now go into R3 and type in the following commands to add the help addresses which allow the router to forward request to the DHCP server. Notice that each of your sub-interfaces are now pointing at your DHCP server. Next delete your existing pools on the R3 router
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Verify that your router now has no DHCP and all helper addresses by typing do show run. Take a screenshot of your show run with your helper addresses. Go into each of your PCs and pull a new IP address by clicking on the PC then Desktop tab, IP Configuration, and switch from DHCP to Static and back from Static to DHCP. Your IP address should now be coming from your DHCP server. Verify your DHCP server by typing the command ipconfig /all and verify that your DHCP server is now your server instead of your router. Take a screenshot of PC1. Deliverables for Task 2 Screenshot of the show run from R3.
Screenshot of ipconfig /all from your PC1.
Task 3 – Setting up DNS on Server1. Now you are going to set up DNS on Server1. First you will need to verify that your DHCP pools all point to the server as the DNS server. Next go into services and select DNS. Make sure the service is on and then type the name server with the address 11.1.1.10 into the resource record. Verify that you are creating a A record and click the add button.
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Go to PC1 and ping from your PC to the Internet server by typing ping server . Now you are going to create a DNS forwarding system where any IP address the DNS doesn’t know is passed along to the Internet DNS server. Create a new DNS A record named root and the IP address of 11.1.1.10.
Now you are going to create an NS record where any item with a .com is passed directly to the 11.1.1.10 Internet server. Let’s verify it works by clicking over to PC1 and then pinging the Internet server by typing nslookup cable.com in a command prompt. The name should resolve using the Internet DNS. Take a screenshot. Open a browser on PC1 and type into the URL www.cable.com. It should resolve and show you the webpage from the Internet server. Take a screenshot.
Deliverables for Task 3 Screenshot of the nslookup for cable.com
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Screenshot of webpage from www.cable.com Task 4 – SSH and Telnet Telnet is an easy program to set up and run on your routers. As long as you don’t have any security concerns there should be no problem using Telnet for your systems. For each router and switch type the following: The “line vty 0 4” enables up to 5 telnet sessions to be active at the same time. The password Password1 is set as the password for telnet.
The line “login” requires the user to authenticate using the password before the telnet session will start. Telnet has been enabled successfully but you still won’t be able to attach to the system remotely. This is because you will need to set up an enable password prior to being allowed to connect remotely. Type R1(config)# enable password Password1 This will enable Telnet into the router and allow for remote connection. Open your Cisco R2 router and type: Enter your telnet password, Password1 , and then the router password, Password1 . Take a screenshot of your telnet login. SSH configuration on routers Secure Shell or SSH is a secure protocol and the replacement for Telnet. 1. Open the router R1 console line and create domain and username. R1(config)# ip domain-name ecpi.local R1(config)# username student password Password 2. Generate the encryption keys for securing the ssh session. Type “crypto key generate rsa” command and press enter, when ask you “How many bits in the modulus [512]:” just type “1024″ and press enter. The system will generate 1024 bits keys to secure session lines.
3. Now enable SSH version 2, set time out duration and login attempt time on the router. Remember this message if you going to use ssh version 2 “Please create RSA keys (of at least 768 bits size) to enable SSH v2.” Go to your PC1 and use SSH to log into your R1 router. Make note that this a lower case l, not the number 1, in the command above. Take a screenshot of your successful login to the R1 server. Setup Telnet and SSH on R2 and R3 and take a screenshot of your successful login to each. Deliverables for Task 4 Screenshot of a successful telnet login to R1, R2, and R3.
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Screenshot of a successful SSH login to R1, R2, and R3.
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