commtech[4] - IS 3413 Introduction to Telecommunications...

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IS 3413 – Introduction to Telecommunications for Business Instructor: Yoris A. Au, Ph.D. Internetworking Slide Set #2 1
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2 Chapter 23 Support Protocols and Technologies
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3 Topics Covered 23.1 Introduction 23.2 Address Resolution 23.3 The Address Resolution Protocol (ARP) 23.4 ARP Message Format 23.5 ARP Encapsulation 23.6 ARP Caching and Message Processing 23.7 The Conceptual Address Boundary 23.8 Internet Control Message Protocol (ICMP) 23.9 ICMP Message Format and Encapsulation 23.10 Protocol Software, Parameters, and Configuration 23.11 Dynamic Host Configuration Protocol (DHCP)
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4 Topics Covered 23.12 DHCP Protocol Operation and Optimizations 23.13 DHCP Message Format 23.14 Indirect DHCP Server Access Through a Relay 23.15 Network Address Translation (NAT) 23.16 NAT Operation and Private Addresses 23.17 Transport-Layer NAT (NAPT) 23.18 NAT and Servers 23.19 NAT Software and Systems for Use at Home
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5 23.1 Introduction This chapter continues the discussion of internetworking by introducing four key support technologies: address binding error reporting bootstrapping address translation Each technology handles a small problem When combined with other protocols each makes a significant contribution to the overall functionality Future chapters extend the discussion of internetworking by focusing on transport layer protocols and Internet routing protocols
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6 23.2 Address Resolution A crucial step of the forwarding process requires a translation: forwarding uses IP addresses a frame transmitted must contain the MAC address of the next hop IP must translate the next-hop IP address to a MAC address The principle is: IP addresses are abstractions provided by protocol software Network does not know how to locate a computer from its IP address the next-hop address must be translated to an equivalent MAC address Translation from a computer's IP address to an equivalent hardware address is known as address resolution And an IP address is said to be resolved to the correct MAC address Address resolution is local to a network
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7 23.2 Address Resolution One computer can resolve the address of another computer only if both computers attach to the same physical network A computer never resolves the address of a computer on a remote network Address resolution is always restricted to a single network. For example, consider the simple internet in Figure 23.1
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8 23.3 The Address Resolution Protocol (ARP) What algorithm does software use to translate? The answer depends on the protocol and hardware addressing here we are only concerned with the resolution of IP Most hardware has adopted the 48 -bit Ethernet In Ethernet: Address Resolution Protocol (ARP) Consider Figure 23.2 Suppose B needs to resolve the IP address of C B broadcasts a request that says: I'm looking for the MAC address of a computer that has IP address
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This note was uploaded on 01/26/2012 for the course IS 3413 taught by Professor Staff during the Fall '08 term at The University of Texas at San Antonio- San Antonio.

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commtech[4] - IS 3413 Introduction to Telecommunications...

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