qr code c# tutorial The __________ layer provides for hardware addressing in Objective-C

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3 The __________ layer provides for hardware addressing
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4 MAC addresses are __________ bits in length and are represented in a __________ numbering format 5 The network layer handles all of the following problems except __________ A B C D A B C D A B C D Broadcast problems Conversion between media types Hierarchy through the use of physical addresses Splitting collision domains into smaller ones Ready/not ready signals Sequence numbers and acknowledgments Windows Ready/not ready signals and windowing Socket Hardware Network Session Devices: (1) Repeater, (2) Router, (3) NIC, and (4) Switch Layers: (a) Physical, (b) Data link, (c) Network, and (d) Transport Note that not necessarily all layers are used in the answer and that a layer can be used for more than one device
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6 __________ are used to provide a reliable connection
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7 Connection multiplexing is done through the use of a __________ number
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8 Match the device with the OSI Reference Model at which it primarily functions
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9 Match the PDU name with the OSI Reference Model at which it is used PDU names: (1) Data, (2) Frame, (3) Packet, (4) Bits, and (5) Segment Layers: (a) Application, (b) Presentation, (c) Session, (d) Transport, (e) Network, (f) Data link, and (g) Physical
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2: OSI Reference Model
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10 You have a network with some network components (shown in Figure 2-6) PC-A wants to send data to PC-B Which of the following statements is true, assuming that the layer 2 medium is Ethernet and TCP/IP is used at layer 3 A When PC-A generates the frame, it puts its MAC address in the source field and the Switch-A s MAC address in the destination field B When PC-A generates the frame, it puts its MAC address in the source field and the PC-B s MAC address in the destination field C When PC-A generates the packet, it puts its IP address in the source field and Router-A s IP address in the destination field D When PC-A generates the packet, it puts Router-A s IP address in the source field and PCB s IP address in the destination field E When Router-A generates the frame, it puts its MAC address as the source and PC-B s MAC address as the destination
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Self Test Answers
SELF TEST ANSWERS
Introduction to the OSI Reference Model
1 D The OSI Reference Model has seven layers A, B, C, and E are functions of the OSI Reference Model and therefore are incorrect answers
Layers of the OSI Reference Model
2 D From high to low, the OSI Reference Model has the following layers: application, presentation, session, transport, network, data link, and physical (f, b, a, g, e, d, c) A doesn t begin with the application layer B s second from the top layer is presentation C switches the session and transport layers 3 C The data link layer provides for hardware addressing A uses port numbers for multiplexing B defines logical addressing D doesn t have any addressing 4 MAC addresses are 48 bits in length and are represented in a hexadecimal format 5 C The network layer creates a hierarchy through the use of logical, not physical addresses A, B, and D are true and thus incorrect 6 B Sequence numbers and acknowledgments are used to provide a reliable transport layer connection A, C, and D are used for flow control 7 A Connection multiplexing is done through the use of a socket or port number B references the data link layer C references the network layer D is a nonexistent type 8 (1) Repeater: (a) Physical; (2) Router: (c) Network; (3) NIC: (b) Data link; and (4) Switch: (b) Data link
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9 (1) Data: (a) Application; (2) Frame: (f) Data link; (3) Packet: (e) Network; (4) Bits: (g) Physical; and (5) Segment: (d) Transport
2: OSI Reference Model
10 E At layer 2, PC-A sends the frame to the router, the router strips off the layer 2 frame and routes the layer 3 packet When putting it on the second segment, the router puts its MAC address as the source in the frame and PC-B s MAC address as the destination A is incorrect because MAC addresses are used to communicate on the same segment and the switch is on a different segment than PC-A; PC-A should use the router s MAC address as the destination B is incorrect because PC-A should use the router s MAC address as the destination C and D are incorrect because layer 3 addresses are used to communicate across networks themselves (that is, multiple segments); therefore, the source IP address should be PC-A and the destination IP address PC-B
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