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As illustrated in Figure 1.2, the TCP/IP model consists of four layers, each of which can have several sublayers. These layers correlate roughly to layers in the OSI reference model and define similar functions. Some of the TCP/IP layers correspond directly with layers in the OSI reference model while other span several OSI layers. The four TCP/IP layers are: ... • The TCP/IP Application Layer refers to communications services to applications and is the interface between the network and the application. It is also responsible for presentation and controlling communication sessions. It spans the Application Layer, Presentation Layer and Session Layer of the OSI reference model. Examples include: HTTP, POP3, and SNMP. • The TCP/IP Transport Layer defines several functions, including the choice of protocols, error recovery and flow control. The transport layer may provide for retransmission, i.e., error recovery, and may use flow control to prevent unnecessary congestion by attempting to

Publisher's Description: CCNA Practice Tests - About CCNA - Cisco Certified Network Associate certification is awarded by Cisco(R) Systems on successful completion of CCNA (Exam code: 640-607) exam. CCNA is a foundation level certification offered by Cisco(R). The exam objectives include TCP/IP fundamentals, OSI model, networking fundamentals like Ethernet, Token Ring, FDDI;Cisco IOS fundamentals, and simple router and switch configurations. CCNA is a leading certification in the area of vendor specific certifications in computer networking technologies. Practice tests for CCNA (Cisco Certified Network Associate) conforms to the latest objectives of the exam. The package contains 225+ questions and most questions carry detailed explanations. The question types presented in the exam simulator include multiple choice, true/false, exhibit based questions. Also, the test engine enables you to review the wrong answers at the end of the exam. Category wise scoring enables the candidate

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1 Which of the following describes the roles of devices in a WAN? (Choose three.) *** A CSU/DSU terminates a digital local loop. A modem terminates a digital local loop. A CSU/DSU terminates an analog local loop. *** A modem terminates an analog local loop. *** A router is commonly considered a DTE device. A router is commonly considered a DCE device. www.p4s-ccna.blogspot.com 2 What value in the address field of a Frame Relay header identifies the destination of the frame? CIR DE *** DLCI ISDN FRAD PVC 3 The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue explains why the link is unable to establish a PPP session? The IP addresses must be on different subnets. *** The usernames are misconfigured. The passwords must be different for the CHAP authentication. The clock rate must be 56000. The clock rate is configured on the wrong end of the link. Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.

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Contents at a Glance Foreword xxii Introduction xxiii Chapter 1 Building a Simple Network 3 Chapter 2 Ethernet LANs 139 Chapter 3 Wireless LANs 207 Chapter 4 LAN Connections 237 Chapter 5 WAN Connections 345 Chapter 6 Network Environment Management 425 Appendix Answers to Chapter Review Questions 465 Index 480 Download Cisco Press ICND1 2nd Edition Jan 2008 part1 Download Cisco Press ICND1 2nd Edition Jan 2008 part2 Download Cisco Press ICND1 2nd Edition Jan 2008 part3 Download Cisco Press ICND1 2nd Edition Jan 2008 part4 Download Cisco Press ICND1 2nd Edition Jan 2008 part5