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ITN_Module_9.pptx
1.
Module 9: Address
Resolution Introduction to Networks v7.0 (ITN)
2.
2 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Module Objectives Module Title: Address Resolution Module Objective: Explain how ARP and ND enable communication on a network. Topic Title Topic Objective MAC and IP Compare the roles of the MAC address and the IP address. ARP Describe the purpose of ARP. Neighbor Discovery Describe the operation of IPv6 neighbor discovery.
3.
3 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential 9.1 MAC and IP
4.
4 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential MAC and IP Destination on Same Network There are two primary addresses assigned to a device on an Ethernet LAN: âą Layer 2 physical address (the MAC address) â Used for NIC to NIC communications on the same Ethernet network. âą Layer 3 logical address (the IP address) â Used to send the packet from the source device to the destination device. Layer 2 addresses are used to deliver frames from one NIC to another NIC on the same network. If a destination IP address is on the same network, the destination MAC address will be that of the destination device.
5.
5 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential MAC and IP Destination on Remote Network When the destination IP address is on a remote network, the destination MAC address is that of the default gateway. âą ARP is used by IPv4 to associate the IPv4 address of a device with the MAC address of the device NIC. âą ICMPv6 is used by IPv6 to associate the IPv6 address of a device with the MAC address of the device NIC.
6.
6 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential MAC and IP Packet Tracer â Identify MAC and IP Addresses In this Packet Tracer, you will complete the following objectives: âą Gather PDU Information for Local Network Communication âą Gather PDU Information for Remote Network Communication
7.
7 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential 9.2 ARP
8.
8 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP ARP Overview A device uses ARP to determine the destination MAC address of a local device when it knows its IPv4 address. ARP provides two basic functions: âą Resolving IPv4 addresses to MAC addresses âą Maintaining an ARP table of IPv4 to MAC address mappings
9.
9 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP ARP Functions To send a frame, a device will search its ARP table for a destination IPv4 address and a corresponding MAC address. âą If the packetâs destination IPv4 address is on the same network, the device will search the ARP table for the destination IPv4 address. âą If the destination IPv4 address is on a different network, the device will search the ARP table for the IPv4 address of the default gateway. âą If the device locates the IPv4 address, its corresponding MAC address is used as the destination MAC address in the frame. âą If there is no ARP table entry is found, then the device sends an ARP request.
10.
10 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP Video - ARP Request This video will cover an ARP request for a MAC address.
11.
11 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP Video â ARP Operation - ARP Reply This video will cover an ARP reply in response to an ARP request.
12.
12 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP Video - ARP Role in Remote Communications This video will cover how an ARP request will provide a host the MAC address of the default gateway.
13.
13 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP Removing Entries from an ARP Table âą Entries in the ARP table are not permanent and are removed when an ARP cache timer expires after a specified period of time. âą The duration of the ARP cache timer differs depending on the operating system. âą ARP table entries can also be removed manually by the administrator.
14.
14 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP ARP Tables on Networking Devices âą The show ip arp command displays the ARP table on a Cisco router. âą The arp âa command displays the ARP table on a Windows 10 PC. R1# show ip arp Protocol Address Age (min) Hardware Addr Type Interface Internet 192.168.10.1 - a0e0.af0d.e140 ARPA GigabitEthernet0/0/0 C:UsersPC> arp -a Interface: 192.168.1.124 --- 0x10 Internet Address Physical Address Type 192.168.1.1 c8-d7-19-cc-a0-86 dynamic 192.168.1.101 08-3e-0c-f5-f7-77 dynamic
15.
15 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP ARP Issues â ARP Broadcasting and ARP Spoofing âą ARP requests are received and processed by every device on the local network. âą Excessive ARP broadcasts can cause some reduction in performance. âą ARP replies can be spoofed by a threat actor to perform an ARP poisoning attack. âą Enterprise level switches include mitigation techniques to protect against ARP attacks.
16.
16 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential ARP Packet Tracer â Examine the ARP Table In this Packet Tracer, you will complete the following objectives: âą Examine an ARP Request âą Examine a Switch MAC Address Table âą Examine the ARP Process in Remote Communications
17.
17 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential 9.3 Copper Cabling
18.
18 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential IPv6 Neighbor Discovery Video â IPv6 Neighbor Discovery This video will explain the process of how IPv6 performs address resolution using ICMPv6 neighbor solicitation and neighbor advertisement messages.
19.
19 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential IPv6 Neighbor Discovery IPv6 Neighbor Discovery Messages IPv6 Neighbor Discovery (ND) protocol provides: âą Address resolution âą Router discovery âą Redirection services âą ICMPv6 Neighbor Solicitation (NS) and Neighbor Advertisement (NA) messages are used for device-to-device messaging such as address resolution. âą ICMTPv6 Router Solicitation (RS) and Router Advertisement (RA) messages are used for messaging between devices and routers for router discovery. âą ICMPv6 redirect messages are used by routers for better next-hop selection.
20.
20 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential IPv6 Neighbor Discovery IPv6 Neighbor Discovery â Address Resolution âą IPv6 devices use ND to resolve the MAC address of a known IPv6 address. âą ICMPv6 Neighbor Solicitation messages are sent using special Ethernet and IPv6 multicast addresses.
21.
21 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential In this Packet Tracer, you will complete the following objectives: âą Part 1: IPv6 Neighbor Discovery Local Network âą Part 2: IPv6 Neighbor discovery Remote Network IPv6 Neighbor Discovery Packet Tracer â IPv6 Neighbor Discovery
22.
22 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential 9.4 Module Practice and Quiz
23.
23 © 2016 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Module Practice and Quiz What did I learn in this module? âą Layer 2 physical addresses (i.e., Ethernet MAC addresses) are used to deliver the data link frame with the encapsulated IP packet from one NIC to another NIC on the same network. âą If the destination IP address is on the same network, the destination MAC address will be that of the destination device. âą When the destination IP address (IPv4 or IPv6) is on a remote network, the destination MAC address will be the address of the host default gateway (i.e., the router interface). âą An IPv4 device uses ARP to determine the destination MAC address of a local device when it knows its IPv4 address. âą ARP provides two basic functions: resolving IPv4 addresses to MAC addresses and maintaining a table of IPv4 to MAC address mappings. âą After the ARP reply is received, the device will add the IPv4 address and the corresponding MAC address to its ARP table. âą For each device, an ARP cache timer removes ARP entries that have not been used for a specified period of time. âą IPv6 does not use ARP, it uses the ND protocol to resolve MAC addresses. âą An IPv6 device uses ICMPv6 Neighbor Discovery to determine the destination MAC address of a local device when it knows its IPv6 address.
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