By Angelescu S.
Cross your CCNA examination and develop your profession — heres simply what you would like! The call for for Cisco qualified community affiliates is up, so upward thrust to the problem and get your certification! This advisor covers all of the belongings you want to know, or even is helping get you in test-taking mode with lots of perform questions about the CD. Plus, you should use this booklet as a reference once you get your CCNA certification and that fab task! simple education — assessment LANs, WANs, Cisco and software program, TCP/IP, and community layout Switches and routers — discover ways to deal with and troubleshoot Cisco switches and VLANs, STP, port trunking, Ether-Channel, VoIP, routers and routing protocols Going instant — plunge into instant conversation techniques and WLAN criteria, operation modes, provider units, and Cisco Unified instant Networks structure suppose safe — examine community defense threats, top practices, entry regulate lists, coping with firewalls, and extra a large web — find out about wide-area community connection forms, DSL networks, information encapsulation protocols, and authentication equipment Open the publication and locate: What hubs, bridges, switches, and routers are for All approximately TCP/IP layers andprotocols the aim of a data-link swap how you can deal with a router utilizing Cisco IOS What to do with WLAN carrier units tips to deal with universal community protection threats the right way to deal with VoIP on Cisco switches Authentication tools for WANs 7 books in 1 Networking fundamentals coping with TCP/IP Switching with Cisco Switches Routing with Cisco Routers instant Networks community safeguard Wide-Area Networks (WANs)
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Move your CCNA examination and advance your profession — heres simply what you would like! The call for for Cisco qualified community affiliates is up, so upward thrust to the problem and get your certification! This consultant covers all of the belongings you want to know, or even is helping get you in test-taking mode with lots of perform questions about the CD.
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Extra info for CCNA Certification All-In-One For Dummies (7 books in 1)
Sequencing and acknowledgments TCP connections are bidirectional: They allow both hosts to send and receive TCP segments. TCP controls the flow of segments in each direction of a connection independently using sender and receiver sequence numbers. Thus, TCP connections maintain two sets of sequence numbers: sender sequence numbers and receiver sequence numbers. The sender sequence 32 Layer 4: Transport ✦ Using acknowledgments to guarantee data delivery ✦ Using bidirectional flow control to coordinate the sending and receiving of segments for optimal data transfer UDP simplicity The User Datagram Protocol (UDP) is a connectionless transport protocol that does not guarantee reliable transmission.
Introducing the TCP/ IP Protocol Suite ✦ E-mail application: This application is used to read, edit, archive, and otherwise manage e-mail messages. E-mail applications typically use SMTP to send and receive e-mails to and from remote hosts. E-mail applications also work at Layer 6, the presentation layer. For example, e-mail applications use the Multipurpose Internet Mail Extensions (MIME) protocol to convert audio, video, picture, graphical, and even software application contents in e-mail messages into a format that can be displayed, rendered, or played on the receiving host.
However, some TCP/IP protocols work at more than one level. Layer 7: Application The application layer represents the various network applications such as e-mail reader and Web browser. It is important to distinguish between Layer 7 protocols and Layer 7 software applications. For example, you use Web-browsing software to view Web pages that are transferred to your computer using the Hypertext Transfer Protocol (HTTP). Web pages are coded in Hypertext Markup Language (HTML) text format. The Web browser is a Layer 7 network application.