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Network Security Lecture 3

by: A. Dighe

Network Security Lecture 3 530

Marketplace > Iowa State University > CPR E > 530 > Network Security Lecture 3
A. Dighe
GPA 3.75

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About this Document

Topics • The Internet • Addressing
Network Security
Jacobson Doug
Class Notes
25 ?




Popular in Network Security

Popular in CPR E

This 8 page Class Notes was uploaded by A. Dighe on Friday July 29, 2016. The Class Notes belongs to 530 at Iowa State University taught by Jacobson Doug in Summer 2016. Since its upload, it has received 7 views. For similar materials see Network Security in CPR E at Iowa State University.


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Date Created: 07/29/16
CprE 530 Lecture 3 Dr Doug Jacobson Topics • The Internet • Addressing The Internet • User’s View Internet The Internet Hierarchy and large regional ISPsSP ISP ISP ISP local ISPsr or local ISPs Internet Addressing • Different address types • Hardware address spoofing • P adddesssSppoofng • IP address Space Application Addressing Different Address types User A User B D1, "Hello" "Hello" Application Application A1 A1 on Port P1 on Port P2 D1, P2, Hello C1, "Hello" CP TCP D1, TCP, Payload Systemediate Systemediate C1, Payload IP - C1 IP - R1 IP - R2 IP -D1 HW2, IP, Payload TCP, C1, Payload Physical Networkal Networkal Networkl NHW1ork HW2 HW3 HW4 Computer Computer C1 D1 The Internet HW2, HW1, IP, Payload HW4, HW3, IP, Payload Address spoofing • Who can generate the address? • Spoofing is the ability to change the ad dddr reesss s • Who can “see” (sniff) the traffic? IP address Spoofing and Sniffing To: Johnry Alice John Message will get to John Computer Computer A B Return message will go back to Alice Internet From: D To: A Computer Computer C D Mary IP Address Space • In Version 4 the IP address is 32 Bits • Total IP address space is 4,294,967,296 IP addresses • The IP address is written as a four-tuple where each tuple is in decimal and are separated by a "" caaled a dot. Whhen talking about an address you pronounce the word dot. So is pronounced 129 dot 186 dot 5 dot 102 IP Addressing Machine names • The format for the machine name is: – machine.domain Where: • macchne isunique tothe domaan or subdomaan.. • and domain is a single domain or a series of subdomains. Domain Name Conversion • Now lets look at how we can convert a machine name into an IP address. • There are two ways that this conversion can takee pacce. – The first is to use a table on each host which maintains the mapping between names and IP tables and made it hard to update.ry large – The second, and preferred, method is to use a nameserver. The nameserver is actually a set of domains and subdomains. authority over different DNS Model Root Server Root Server Root Server First Level First Level Server Server What is the IP address of DNS DNS IP address of DNS DNS DNS Send mail to:


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