Spring 2003 MIS 140 Mesher MIS 140 EXAM 1 REVIEW NOTES Be able to answer the following questions CHAPTER 1 INTRODUCTION TO DATA COMMUNICATIONS 1 HISTORY OF THE INTERNET Describe the history of the Internet from its creation to the present 2 INFORMATION LAG What is meant by an Information lag Give an example 3 OSI REFERENCE MODEL List and number the seven layers of the OSI reference model from lowest to highest 4 1984 COURT DECISION The US telecommunications industry was reorganized by a 1984 federal court decision Discuss the two main results of this decision 5 INTERNET STANDARDS MAKING Describe the process by which new standards are created for the Internet 6 NETWORKING STANDARDS What is a standard What are the two types of standards Why are standards important 7 LANs Backbones MANs WANS What are they and how do LANs differ from MANs WANs and backbone networks CHAPTER 2 APPLICATION LAYERS 1 APPLICATION ARCHITECTURE What are three different types of Application architectures How did they come about Why are many Host based systems are still being used What was behind the popularity of client based systems Why has clientserver architecture become so popular 2 2 TIER 3 TIER AND N TIER ARCHITECTURES Be able to compare and contrast these 3 THIN CLIENTS What is a thin client How does a thin client differ from a thick client Why have thin client architectures become popular 4 HTTP What is HTTP used for Describe the basics of an HTTP request response cycle Contrast the HTTP request and response How are they different How are they similar 5 E MAIL Describe how user agents and message transfer agents work together to transfer mail messages Be able to draw a diagram showing this What roles do SMTP POP and IMAP play in sending e mail 6 INSTANT MESSENGER Describe how Instant Messenger works Be able to draw a diagram showing this 1 Spring 2003 MIS 140 Mesher CHAPTER 3 INTERNETWORK LAYERS 1 TRANSPORT AND NETWORK LAYERS What are the main functions of the transport and network layers 2 ADDRESSING What are the three types of addresses used on the Internet What is the difference between static and dynamic addressing Under what conditions is dynamic addressing desirable When is static addressing better 3 IP and IP ADDRESSES What does an IP address look like What is dotted decimal notation Why are there two versions of IP What are their main differences What is ICANN and what is its role in IP addressing 4 ADDRESS RESOLUTION What is address resolution How does TCP IP resolve Domain Names into IP addresses What is DNS and how does it work How are IP addresses resolved in Data Link Layer addresses 5 TCP and UDP What are the differences between TCP and UDP Why are there two transport different layer protocols used by TCP IP How does TCP provide reliable delivery Why does HTTP use TCP and DNS use UDP How does TCP establish a connection What is a virtual circuit and how does it work 6 ROUTING What is a routing table How does a router work Describe the process whereby a router makes a decision on how an incoming packet is routed What is the difference between static and dynamic routing When is it preferable to use static or dynamic routing How does decentralized routing differ from centralized routing Compare and contrast distance vector and link state routing algorithms Give an example of each Be able to define interior and exterior routing protocols 7 QUALITY OF SERVICE What is quality of service routing and how is it implemented Why is it important 8 SUBNET MASKS What are subnet masks What are they used for Give an example of a subnet mask and show how it is used in networking 9 RELIABLE DELIVERY What is meant by reliable delivery What does it mean for a protocol to be unreliable How does TCP provide reliable delivery 2 Spring 2003 MIS 140 Mesher CHAPTER 4 HARDWARE LAYERS LOCAL AREA NETWORKS TERMS YOU CAN SKIP DSAP SSAP 1 HARDWARE LAYERS What are the three main functions of the Data Link Layer What does the physical layer do 2 OPTICAL FIBER Describe and contrast the three main types of optical fiber currently in use Which ones are used under which conditions 3 CSMA CD What does it stand for Describe how it works 4 ETHERNET SWITCHES How does an Ethernet switch know where to send the frames it receives Describe how switches gather this information Why is switched Ethernet replacing shared Ethernet is the preferred Ethernet technology 5 MANCHESTER ENCODING Describe the basics of how Manchester encoding works Draw a simple diagram depicting a bit stream encoded as a Manchester wave 6 ERROR DETECTION AND CORRECTION USING ETHERNET How does the process of error detection work How does Stop and Wait ARQ Work 7 ETHERNET FRAME STRUCTURE What are the four sections of the Ethernet Frame and what are the main contents of each 8 DATA LINK AND MEDIA ACCESS CONTROL PROTOCOL EFFICIENCIES What is DL Protocol Efficiency Under what conditions is the DL protocol efficiency highest What is MAC protocol efficiency Under what conditions is the MAC protocol efficiency high Low 3