Author: examcert

The Cisco IOS Command Line Summary (27.4) The following is a summary of each topic in the module: What Did I Learn in this Module? (27.4.1) • IOS Navigation—The Cisco IOS CLI is a text-based program that enables entering and executing Cisco IOS commands to configure, monitor, and maintain Cisco devices. The Cisco CLI can…

View Device Information (27.3) The Cisco IOS provides commands to verify the operation of router and switch interfaces. The commands are commonly known as “show commands.” Video – Cisco IOS Show Commands (27.3.1) Refer to the online course to view this video. Show Commands (27.3.2) The Cisco IOS CLI show commands display relevant information about…

A Note About Syntax Checker Activities (27.1.5) When you are learning how to modify device configurations, you might want to start in a safe, non-production environment before trying it on real equipment. NetAcad gives you different simulation tools to help build your configuration and troubleshooting skills. Because these are simulation tools, they typically do not…

Objectives Upon completion of this chapter, you will be able to answer the following questions: • How do you navigate to the different Cisco IOS modes? • How do you navigate the Cisco IOS to configure network devices? • How do you use show commands to monitor device operations? Key Terms This chapter uses the…

Transport Layer Summary (26.8) The following is a summary of each topic in the chapter and some questions for your reflection. Packet Tracer—TCP and UDP Communications (26.8.1) In this activity, you will explore the functionality of the TCP and UDP protocols, multiplexing, and the function of port numbers in determining which local application requested the…

UDP Communication (26.7) Sometimes the reliability associated with TCP is not required or the overhead associated with providing this reliability is not suitable for the application. This is where UDP is used. UDP Low Overhead Versus Reliability (26.7.1) As previously explained, UDP is perfect for communications that need to be fast, like VoIP. This topic…

TCP Flow Control—Maximum Segment Size (MSS) (26.6.6) In Figure 26-27, the source is transmitting 1,460 bytes of data within each TCP segment. This is typically the Maximum Segment Size (MSS) that the destination device can receive. The MSS is part of the Options field in the TCP header that specifies the largest amount of data,…

TCP Flow Control—Window Size and Acknowledgments (26.6.5) TCP also provides mechanisms for flow control. Flow control is the amount of data that the destination can receive and process reliably. Flow control helps maintain the reliability of TCP transmission by adjusting the rate of data flow between source and destination for a given session. To accomplish…

Reliability and Flow Control (26.6) Reliability and flow control are two of the main features of TCP, not present in UDP. TCP Reliability—Guaranteed and Ordered Delivery (26.6.1) The reason that TCP is the better protocol for some applications is that, unlike UDP, it resends dropped packets and numbers packets to indicate their proper order before…

TCP Connection Establishment (26.5.2) In some cultures, when two persons meet, they often greet each other by shaking hands. Both parties understand the act of shaking hands as a signal for a friendly greeting. Connections on the network are similar. In TCP connections, the host client establishes the connection with the server using the three-way…