tailieunhanh - Lecture TCP-IP protocol suite (3/e): Chapter 7 - Behrouz Forouzan

Chapter 7 - ARP and RARP. Upon completion you will be able to: Understand the need for ARP, understand the cases in which ARP is used, understand the components and interactions in an ARP package, understand the need for RARP. | Chapter 7 Upon completion you will be able to: ARP and RARP Understand the need for ARP Understand the cases in which ARP is used Understand the components and interactions in an ARP package Understand the need for RARP Objectives TCP/IP Protocol Suite Figure ARP and RARP TCP/IP Protocol Suite Figure Position of ARP and RARP in TCP/IP protocol suite TCP/IP Protocol Suite ARP ARP associates an IP address with its physical address. On a typical physical network, such as a LAN, each device on a link is identified by a physical or station address that is usually imprinted on the NIC. The topics discussed in this section include: Packet Format Encapsulation Operation ARP over ATM Proxy ARP TCP/IP Protocol Suite Figure ARP operation TCP/IP Protocol Suite Figure ARP packet TCP/IP Protocol Suite Figure Encapsulation of ARP packet TCP/IP Protocol Suite Figure Four cases using ARP TCP/IP Protocol Suite An ARP request is broadcast; . | Chapter 7 Upon completion you will be able to: ARP and RARP Understand the need for ARP Understand the cases in which ARP is used Understand the components and interactions in an ARP package Understand the need for RARP Objectives TCP/IP Protocol Suite Figure ARP and RARP TCP/IP Protocol Suite Figure Position of ARP and RARP in TCP/IP protocol suite TCP/IP Protocol Suite ARP ARP associates an IP address with its physical address. On a typical physical network, such as a LAN, each device on a link is identified by a physical or station address that is usually imprinted on the NIC. The topics discussed in this section include: Packet Format Encapsulation Operation ARP over ATM Proxy ARP TCP/IP Protocol Suite Figure ARP operation TCP/IP Protocol Suite Figure ARP packet TCP/IP Protocol Suite Figure Encapsulation of ARP packet TCP/IP Protocol Suite Figure Four cases using ARP TCP/IP Protocol Suite An ARP request is broadcast; an ARP reply is unicast. Note: TCP/IP Protocol Suite A host with IP address and physical address B2:34:55:10:22:10 has a packet to send to another host with IP address and physical address A4:6E:F4:59:83:AB (which is unknown to the first host). The two hosts are on the same Ethernet network. Show the ARP request and reply packets encapsulated in Ethernet frames. Example 1 See Next Slide TCP/IP Protocol Suite Solution Figure shows the ARP request and reply packets. Note that the ARP data field in this case is 28 bytes, and that the individual addresses do not fit in the 4-byte boundary. That is why we do not show the regular 4-byte boundaries for these addresses. Also note that the IP addresses are shown in hexadecimal. For information on binary or hexadecimal notation see Appendix B. Example 1 (Continued) See Next Slide TCP/IP Protocol Suite Figure Example 1 TCP/IP Protocol Suite Figure Proxy ARP TCP/IP Protocol Suite ARP .