Jeremy’s IT Lab - CCNA Course

Introduction

• Free, complete course for the CCNA.
• Subscription and engagement (likes, comments, shares) are encouraged.
• Sign up via the link in the description for lab files to use in Packet Tracer.
• Recommendation for Boson’s NetSim for the CCNA, a superior network simulator.

Lab Configuration: DNS (Domain Name System)

Step 1: Configure Default Route to the Internet on R1

• Configure R1 to act as DNS server using command IP DNS SERVER.
• Use 1.1.1.1 (Cloudflare DNS) as DNS server.
• Command:
  • IP ROUTE 0.0.0.0 0.0.0.0 203.0.113.2
  • Test with DO PING 1.1.1.1.
  • INTERNET cloud is just a router with a changed icon.

Step 2: Configure PCs to use DNS Server

• Configure PC1, PC2, PC3 to use 1.1.1.1 as DNS server.
• PC Configuration:
  • Config tab ➔ DNS server ➔ 1.1.1.1
• Discussion on DHCP vs. Static configuration.

Step 3: Configure R1’s DNS Server

• Configure DNS server and host table for local network (192.168.0.0/24).
• Commands:
  • IP NAME-SERVER 1.1.1.1
  • Host entries:
    • IP HOST R1 192.168.0.254
    • IP HOST PC1 192.168.0.1
    • IP HOST PC2 192.168.0.2
    • IP HOST PC3 192.168.0.3
  • Verify with DO SHOW HOSTS
  • Test with DO PING PC1
  • IP DOMAIN LOOKUP command enabled by default

Step 4: Using Packet Tracer’s Simulation Mode

• Demonstrate traffic flow when PC1 pings youtube.com by name.
• Simulation Steps:
  • Enable Simulation Mode (bottom right).
  • From PC1, command: PING youtube.com
  • DNS query message process and MAC address resolution explanations.
  • ARP messages and ICMP message creation for ping.
  • First ping might fail due to ARP process; subsequent pings likely succeed.
• Highlight on understanding DNS operations, not just configuration.
• Packet Tracer Simulation Mode as a tool to understand network traffic.

Boson NetSim Lab Preview

Lab Selection

• Configuring DNS 1 (out of four DNS labs).
• Simple topology: One router, one switch, two PCs.
• Introduction to IPCONFIG, default gateway, IP address, and DNS server settings.

Task 1: Device Configuration

• Router1 Configuration:
  • Hostname: HOSTNAME Router1
  • Interface F0/0: INTERFACE F0/0, IP: 10.0.0.1 /24
• Switch1 Configuration:
  • IP address on VLAN1 (Layer 2 switch): 10.0.0.2 /24
  • Enabled with NO SHUT
• PC1 and PC2 Configuration:
  • PC1: IPCONFIG /IP 10.0.0.100 /24, IPCONFIG /DG 10.0.0.1
  • PC2: IPCONFIG /IP 10.0.0.101 /24, IPCONFIG /DG 10.0.0.1
• Verification:
  • DO SHOW IP INTERFACE BRIEF
  • DO SHOW IP INTERFACE F0/0
  • Network connectivity verification via ping from Router1 to Switch1, PC1, and PC2.

Task 2: Configuring DNS

• Step 1: Ping Router1 from Switch1 by name (expected to fail due to no DNS config).
• Step 2: Enable DNS server on Router1: IP DNS SERVER
• Step 3: Configure host table entries on Router1: IP HOST Router1 10.0.0.1, IP HOST Switch1 10.0.0.2
• Step 4: Configure Switch1 to use Router1’s IP as DNS server: IP NAME-SERVER 10.0.0.1
• Step 5: Verify hostname-to-address translation on Switch1: PING Router1

Conclusion

• Encouragement to use Boson NetSim for CCNA labs.
• Listing and thanking JCNP-level channel members.
• Final tips for subscribing, liking, commenting, and sharing the video.