Chapter 5 - TRANSPORT and NETWORK LAYERS - Part 2 - Static and Dynamic Addressing Address Resolution Dr. V.T. Raja Oregon State University

Static Addressing (Questions) In each computer, which file typically stores the IP address and subnet mask addresses associated with that computer? What ‘ command(s)’ will help determine the IP/DL address of a computer running Windows OS? What is static addressing? Is static addressing better for clients/servers? Identify a disadvantage associated with static addressing

Dynamic Addressing (Questions) A solution to this problem is dynamic addressing. What is dynamic addressing? The server that performs dynamic addressing is called a _________ server.

Dynamic Addressing (Continued) Are dynamically assigned addresses temporary or permanent? How would you assign a client a permanent IP using dynamic addressing? Which option would an ISP likely use to assign IP addresses to its subscribers’ computers? Does dynamic addressing simplify network address management?

Dynamic Addressing (Continued) Dynamic addressing greatly simplifies network address management: IP address changes need to be done only to DHCP server, not to each individual computer’s configuration file. Next time a client (which has been moved to another subnet) requests an IP address, the new changed IP address will be automatically assigned to the client by DHCP server.

Address Resolution Address resolution refers to the process of: Translating an application layer address (or domain name) into a network layer address Translating network layer address into a data link layer address.

Address Resolution (Continued) TCP/IP uses two different approaches, one for resolving application layer addresses into IP addresses and one for resolving IP addresses into data link layer addresses.

Address Resolution (Example) Example: Request a web page from the COB web server at University of Hawaii NL Address or Server name Resolution Given AL address, determine IP address Server name resolution is the translation of AL addresses into NL addresses. How is this done? Whenever an organization receives a set of Internet addresses, it must inform ICANN of the name and IP addresses of the name server(s) that will provide DNS information (directory assistance) for all addresses in that organization

Address Resolution (Example) DL Address Resolution Given NL address, determine NIC address. How is this done? Class Participation Exercise # 3