W2.7 Guided Practice DHCP
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ECPI University, Manassas *
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202L
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Information Systems
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Jan 9, 2024
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Introduction to Routing and Switching Week 2 Guided Practice: DHCP
Objective
In this Guided Practice you will be connecting and configuring a small subnetted network with multiple routers. Technology
You will use Packet Tracer in this practice. Anytime you see a 50 in an IP address replace with your assigned number.
Task 1 – Configuring DHCP
You will start with the network you previously connected and configured in the VLSM Guided Practice. Notice the labeling of the VLANs and network addresses below. Make sure to make similar labels to your network before moving to the next step.
In week 1 you configured DCHP pools on a router. A more common way to configure DCHP on a network is to have DCHP pools configured on a server. Follow the steps below to configure DHCP pools on Server1 of your network. Your PCs and Wi-Fi Router will use DCHP and the servers will both have static IP addresses.
Reference the previous Guided Practice for any IP addressing information that you may need. Assign Server1 and Server2 static IP addresses. As a reminder, use your assigned number for the third octet where 50 is used for instructional purposes.
Double click on Server1 and under Services at the top click DHCP on the left.
You will now begin to add the DHCP pools for your PCs and the Wi-Fi Router . Under Interface at the top
click On for Service.
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Start by adding the first DCHP pool that PC1 will use. Once you fill in the information click on Add at the bottom. You will then see the PC1 DCHP pool at the bottom of the screen. Continue creating the other four DCHP pools using the same steps as above. Take a screenshot.
Next we need to tell the R1 and R3 routers where these DCHP pools are located. Console into the R3 router. We will add the ip helper command to our four sub-interfaces. This will tell the router where to go to for a DHCP request.
Verify your PCs all receive IP addresses via DCHP. Take a screenshot of each.
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Deliverables for Task 1
Screenshot of your DCHP pools on Server1.
Screenshot of your PCs with IP addresses via DHCP.
Task 2 – Configuring SSH and Telnet
You will now set up SSH and Telnet communications on your routers. This is the typical way network administrators set up their systems so they can communicate to each router from a central location. Otherwise you will need to physically travel to each router with your laptop and
a console cable.
You will set up SSH for communications across the network. You will need to do the following for the R1, R2 and R3 routers on your network. Below is an example for the R1 router.
1.
Create a secret password on the R1 router.
2.
Create a domain and logon username.
3.
Now we are going to create the crypto key for the SSH session.
4.
Now enable SSH version 2, set time out duration and login attempt time on the router. 5.
Enable VTY lines and configure access protocols.
Testing Connectivity
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Ping from PC2 to the R2 rou
ter. Take a screenshot.
Let’s now SSH from PC2 to the R2 router from the same command prompt. You will use class for the first password and hit enter. Then type enable and enter then cisco for the second password. You will now enter the R2 router. Take a screenshot. Go ahead and SSH to the R1 and R3 routers as well and take screenshots like the one below for the R1 router.
Next we will Telnet from PC4 to the R1 router. The sequence is similar to SSH, see example below. Open a command prompt and type telnet 192.168.___.241. Your username and passwords are the same as you used for SSH. Take a screenshot. Go ahead and Telnet to the R2 and R3 routers as well and
take screenshots like the one below for the R1 router.
What are some differences between SSH and Telnet? Why should you use SSH and not Telnet?
Deliverables for Task 2
Screenshot of ping from PC2 to the R2 router.
Screenshot of SSH and Telnet to each router on the network.
Answer the questions about Telnet vs SSH: What are some differences between SSH and Telnet?
Why should you use SSH and not Telnet
Security:
SSH (Secure Shell): Encrypts the entire communication session, including authentication information and
data, providing a secure and private connection.
Telnet: Sends data, including passwords, in plain text, making it susceptible to interception and unauthorized access.
Authentication:
SSH: Supports various authentication methods, such as passwords, public-key cryptography, and two-
factor authentication, enhancing security.
Telnet: Relies on basic username and password authentication, which is vulnerable to eavesdropping attacks.
Encryption:
SSH: Implements strong encryption algorithms to protect the confidentiality of data during transmission.
Telnet: Lacks encryption, exposing transmitted data to potential interception and monitoring.
Port Number:
SSH: Typically uses port 22 by default.
Telnet: Traditionally uses port 23 by default.
Data Integrity:
SSH: Ensures the integrity of transmitted data, detecting and preventing tampering during the communication process.
Telnet: Does not provide mechanisms for data integrity, making it susceptible to unauthorized modifications.
Use Cases:
SSH: Suitable for secure remote access, file transfer (SFTP), and secure communication over untrusted networks.
Telnet: Primarily used for non-sensitive applications or in controlled, secure environments where encryption is not a concern.
SSH is recommended over Telnet due to its robust security features, encryption capabilities, and support
for advanced authentication methods. Using SSH helps ensure the confidentiality, integrity, and security of data during remote communication, especially over untrusted networks.
Task 3 – DNS
In this task you will be using DNS that is configured on the Internet Server where there are three DNS a records configured.
What is a DNS A record? The "A" stands for "address" and this is the most fundamental type of DNS record:
it indicates the IP address of a given domain
. For example, if you pull the DNS records of cloudflare.com, the A record currently returns an IP address of: 104.17. 210.9. A records only hold IPv4 addresses. Double click on the Internet server and under Services at the top click on DNS.
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You will see three different A records- we will use server.com.
Go to PC4 and open a command prompt. Ping 11.1.1.10 and then server.com. Take screenshots. Finally bring up a Web Browser and put server.com in the URL box. Take a screenshot.
Deliverables for Task 3
Screenshot of ping from PC4 to 11.1.1.10
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Screenshot of ping from PC4 to server.com
Above
Screenshot of Web Browser using server.com