process has to pass through one or more than one person‚ depending upon the cost involved‚ the position and/or right of the person. Once sanctioned‚ request passes on to the purchasing department. Identify the item & supplier: Selection of appropriate model & supplier‚ with the help of office supply catalog. The person in the purchasing department has to check more than one catalog and contact the suppliers to find out the availability‚ present cost or may be latest version. Issue a purchase order‚ fax
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telephone or cable companies‚ but a LAN does not. ← All WAN implementations generally use the same Layer 2 protocol but there are many accepted LAN Layer 2 protocols in use. 1.1.3 The Evolving Network Model Which statement is true of the functionality of the layers in the hierarchical network model? ← The purpose of the access layer is to provide very high bandwidth communications between network devices. ← Most security screening to prevent unauthorized entry to the network happens at
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sends a frame to computer D‚ what computers receive the frame? *only computer D only computer A and computer D only computer B‚ computer C‚ and computer D all computers When connectionless protocols are implemented at the lower layers of the OSI model‚ what is usually used to acknowledge that the data was received and to request the retransmission of missing data? IP UDP Ethernet a connectionless acknowledgement *an upperlayer‚ connectionoriented protocol or service Refer to the exhibit
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Transmission Control Protocol and Internet Protocol Currently‚ About 2.4 billion people use the internet‚ yet there probably is only a small percentage who understands how the internet sends information or where the technology to send the data originated. (Miniwatts Marketing Group‚ 2008) In 1973‚ a paper titled "A Partial Specification of an International Transmission Protocol" was written by Vint Cerf. This paper included a system for more efficiently transmitting information across a network
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| a. Two or more devices connected to a common medium | b. Node | d. A layer of the Open Systems Interconnection (OSI) model that frames upper-layer data and controls how data is placed on a medium | c. Media | b. A device on a network | d. Network | e. The physical means used to carry data signals | e. Data Link | c. The protocol data unit (PDU) used in Layer 2 of the OSI model | Concept Questions 1. What are the two main jobs of the data link layer? * Allows the upper layers to access the
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DATA COMMUNICATIONS 10-1 Communication Basics Computer communications is at three levels – Application level – Computer level – Communication channel Protocol – Set of rules for communications – OSI Standard 10-2 OSI Reference Model Layer 7 6 5 4 3 2 1 Name Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Purpose Application-to-application communication Manage data representation
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Christopher C. Johnson Course: NT1210 – “Introduction to Networking” Assignment: Unit 3 Assignment 1: Networking Models Review Due Date: 7/17/2014 Instructor: Mr. Greg Tarver Chapter # 3 / Review 1.) A. 2.) A. / C. 3.) A. / C. 4.) C. / D. 5.) C. / B. 6.) A. / B. 7.) D. 8.) B. 9.) B. 10.) B. 11.) C. 12.) B. 13.) C. 14.) A. / C. 15.) C. 16.) C. / D. 17.) D. 18.) A. / C. 19.) A. / C. 20.) B. / C. / D. Key Terms TCP/IP network - is the basic communication language
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Security and the OSI Model Network security is a topic that reaches far beyond the realm of firewalls‚ passwords‚ and user ID accounts. For a network and data to remain secure there must be protective measures at each level in the OSI interconnect model. While each layer basically operates autonomously of the other it is important to ensure that the data being transmitted from the host to destination has not been tampered with or is being prevented from reaching its destination. There are
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CCNA Chapter 1 OSI 7 layer model Application File‚ Print‚ database‚ apps‚web Presentation Encryption‚ compression‚ translations‚ ebdic etc. Session Dialog control - nfs‚ sql‚ rpc ‚ Connection establishment‚ data transfer‚ connection release Transport End to end connection‚ Flow control‚ Data integrity‚ Retransmissions Segments re-ordered before delivery‚ Make / tear down virtual circuits Network Routing ‚ Map of network (logical) Data Link Framing Ensures messages delivered to correct
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• Question 1 5 out of 5 points Which of the following files is edited to block a search engine’s bots from indexing an organizational Web site? Selected Answer: robots.txt Answers: lmhosts.txt robots.txt host.txt index.txt • Question 2 5 out of 5 points Web resources used to footprint a company include all but which one of the following? Selected Answer: Request for Comments (RFC) archive Answers: Internet archive SEC EDGAR Company Web site Request for Comments
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