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CCNA DHCP Deepdive N ovember, 2011

CCNA DHCP Deepdive N ovember, 2011. Jaskaran Kalsi & Anton Merckushov Assoc. Technical Managers Europe/ CEE / RCIS Cisco Networking Academy . Agenda. CCNA & DHCP. DHCP Overview. DHCP Self-paced Learning. Interactive Troubleshooting. Summary. Objective.

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CCNA DHCP Deepdive N ovember, 2011

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  1. CCNA DHCP DeepdiveNovember, 2011 Jaskaran Kalsi & Anton Merckushov Assoc. Technical Managers Europe/CEE/RCIS Cisco Networking Academy

  2. Agenda CCNA & DHCP DHCP Overview DHCP Self-paced Learning Interactive Troubleshooting Summary

  3. Objective • Provide a brief review of DHCP. • Demonstrate a brief example of how DHCP can be administered. • Provide a brief description of the troubleshooting scenarios that are available. • Provide an overview of the DHCP IPD offering and its components. • Focus on the use of Packet Tracer as a simulation tool and create an interactive session where the audience troubleshoots and pre-configured network.

  4. DHCP Overview

  5. DHCP & NetAcad CCNA • DHCP is an area that not only students struggle with but also instructors. • DHCP is covered in both CCNA Discovery & Exploration. • CCNA Discovery: • CCNA Discovery 1 - Chapters 5 & 9 • CCNA Discovery 2 - Chapters 5 & 9 • CCNA Exploration: • CCNA Exploration 1 - Chapter 2 • CCNA Exploration 3 - Chapters 2 & 5 • CCNA Exploration 4 - Chapter 7 • RFC 2131

  6. Brief Review of DHCP • Purpose of DHCP in a network… • Static vs. Dynamic • DHCP servers and options • DHCP operation • Example of router IOS DHCP configuration with multiple pools • Useful DHCP related IOS show commands • DHCP issues and troubleshooting tips

  7. Manual vs. Dynamic Addressing • Manual Addressing (static): • Static IP Addresses are typically assigned to routers, servers, and network printers. • Enables remote administration. • Dynamic Address (using DHCP): • Automates assignment of IP address configuration. • Dynamic IP addresses are typically assigned to PC’s, laptops, and other mobile devices. • Facilitates movement of portable devices on the network. • Reduces administrative burden on network staff and virtually eliminates entry errors. • DHCP can be used to allocate IPv4 as well as IPv6 addresses.

  8. Manual vs. Dynamic Addressing

  9. DHCP Options & Servers • A DHCP server typically provides DHCP clients with: • IP Address; Subnet Mask; Default Gateway; DNS server(s); & Lease Time. • Benefits of a Network Server providing DHCP: • More scalable than other solutions. • Offloads DHCP function from network devices. • Relatively easy to manage. • Benefits of a Router providing DHCP: • Simple solution for small branch office or wireless home network. • Less costly because a dedicated DHCP server is not required. • Cisco IOS provides a DHCP server in routers and multilayer switches.

  10. DHCP Server Types & Locations

  11. DHCP Operation • Client broadcasts a Discovery message. • Server responds with a potential IP address offer. • Client sends request to use the suggested address. • Server responds with an acknowledgment.

  12. IOS DHCP Example: Multi-pool Topology

  13. IOS DHCP Example: Multi-pool Config R1(config)# ipdhcp excluded-address 192.168.10.1 192.168.11.9 R1(config)# ipdhcp excluded-address 192.168.10.254 R1(dhcp-config)# ipdhcp pool LAN-POOL-1 R1(dhcp-config)# network 192.168.10.0 255.255.255.0 R1(dhcp-config)# default-router 192.168.10.1 R1(dhcp-config)# domain-name span.com R1(config)# ipdhcp excluded-address 192.168.11.1 192.168.11.9 R1(config)# ipdhcp excluded-address 192.168.11.254 R1(dhcp-config)# ipdhcp pool LAN-POOL-2 R1(dhcp-config)# network 192.168.11.0 255.255.255.0 R1(dhcp-config)# default-router 192.168.11.1 R1(dhcp-config)# domain-name span.com

  14. Useful DHCP IOS show Commands

  15. Useful DHCP IOS show Commands

  16. DHCP Troubleshooting Process • Task 1: Resolve IP address conflicts. • R2# show ipdhcp conflict • IP address Detection Method Detection time • 192.168.1.32 Ping Feb 16 2011 12:28 PM • 192.168.1.64 Gratuitous ARP Feb 23 2011 08:12 AM • Task 2: Verify physical connectivity. • R2# show interface type/number • Task 3: Configure client with static address and test connectivity. • Task 4: Verify Switch Port Configuration (STPPortfast & Other Commands)

  17. DHCP Troubleshooting Process • Task 5: Verify DHCP server information with client/server on the same subnet. Issues can include: • Incorrect information being provided by the DHCP server. • Service not enabled on DHCP server. • Client not set up as DHCP client. • Rogue DHCP server in the subnet. • Task 6: Verify DHCP communication between client/server on different subnets. Issues can include: • DHCP relay issues. • IP helper address missing or incorrectly configured.

  18. Troubleshooting Examples

  19. DHCP Self Paced Learning

  20. DHCP: Self Paced Learning • Developed by Cisco IPD Team for use by CCNA-level instructors. • Uses a scenario-based trouble ticket problem and resolution approach with Packet Tracer simulations. • Configure/correct problems in order for the network to function. • Helps reinforce an instructor’s understanding of various protocols and technologies, in this case DHCP. • Provides multiple preconfigured PT troubleshooting scenario topologies with good/bad PT files for each trouble tickets. • First two pages of the guides available for each scenario can be used as a student assignment.

  21. DHCP: Self Paced Learning DEMO

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