1. Physical Layer. Is the physical connection between the sender and the receiver. It includes all the hardware devices (computers‚ modems‚ and hubs) and physical media (cables and satellites). This layer specifies the type of connection and the electrical signals‚ radio waves‚ or light pulses that pass through it. 2. Data Link Layer. Is responsible for moving a message from one computer to the next computer in the network path from the sender to the receiver. This layer has 3 functions: a
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circuits. _____3. Which of the following would be a standard used at the Data Link layer of the Internet or OSI model? k) IP l) TCP m) Ethernet n) HTTP o) FTP _____4. In which layer of the Internet model would the HTTP standard be used? p) physical q) application r) transport s) network t) data link _____5. The network layer of the Internet model uses the _____________ protocol to route messages though
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6pages of short answers Review – labs • • Travel over the internet; TCP/UDP is from end to end‚ IP is in the middle‚ between hops o Write email – this is data o Data is sent to the transport layer and is SEGMENTED‚ adds s/d PORT # and sequence number o Network layer turns these into packets with s/d ip address o Data link layer turns these into frames with s/d mac address for default gateway o Frames go to switch and switch checks source mac and learns it if it doesn’t o Switch checks
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describe the 7 layers of the Open System Interconnection model (OSI model) and the layers of the Transport Control Protocol/Internet Protocol model (TCP/IP model)‚ and explain the similarities and differences of each model. The 7 layers of the OSI model consist of: The Application layer (layer 7)‚ The Presentation layer (layer 6)‚ The Session layer (layer 5)‚ The Transport layer (layer 4)‚ The Network layer ( layer 3)‚ The Data Link layer (layer 2) and The Physical layer (layer 1). All 7 layers together
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leak out onto other wires.= crosstalk*3The Transport layer deals with which unit of information?= segment.4Which of the following is not a function of the Network Access layer?= delivers packets efficiently.*5In what layer does the NIC operate?= Network Access*6Which protocol is responsible for determining the MAC address associated with each IP address and keeping a table of its results?=ARP*7Which of the following is not an Application layer protocol?= TCP.*8An IP address consists of four octets
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any device. Why IrDA? IrDA is intended for point-to-point links between two devices for simple data transfers and file synchronization. Technical Specifications Transmission Technology Bluetooth & HomeRF: Radio Frequency IrDA: Infrared Light Beams Spectrum Bluetooth & HomeRF: 2.4 to 2.485 GHz IrDA: Optical Technical Specification (cont.) Range Bluetooth: 10 meters HomeRF: 50 meters IrDA: 1 meter Data Rate Bluetooth: 1 MB HomeRF: 2 MB IrDA: 4MB Technical Specification
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because they can process and transfer data in the second layer or the data link layer of the OSI model. Switches can also use routing which makes them be referred to as multilayer switches or third layer. A layer 2 switch or second layer is a network bridge that operates in the data link layer. A layer 2 can connect several small devices at work or at home. This is accomplished by having the bridge acquire the MAC addresses for all of the connected devices. Layer 2 differs from standard routers in
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and logical link layers of digital telecommunications channels using a packet switching methodology. Multiprotocol Label Switching (MPLS) is a mechanism in high-performance telecommunications networks that directs data from one network node to the next based on short path labels rather than long network addresses‚ avoiding complex lookups in a routing table. Frame Relay aimed to make more efficient use of existing physical resources as clients were unlikely to be utilizing a data service 100
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Spring 2013 Chapter 1 Data Communications and Networks Overview and Protocol Layers Dr. Çağrı Güngör 1 Basic Info about the Course • Course Content (tentative): — Computer networks; network architectures; protocol layers; TCP/IP; principles of Internet; wireless networks; introduction to network management‚ etc.. • Course Objectives: — Understand widely known network protocols‚ communication architectures‚ and wireless networks‚ — Learn TCP/IP and protocol layers‚ — Get a basic understanding
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Answer: True‚ page 30 8 - The presentation logic works with the client computer in a client-server network. Answer: True‚ page 27 9 - A “thin client” approach places most of the application logic on the client. Answer: False‚ page 31 10 - The very first data communications networks were client-server networks. Answer: False‚ page
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