By Diane Teare
Designing for Cisco Internetwork suggestions (DESGN), moment variation, is a CiscoR-authorized, self-paced studying software for CCDAR beginning studying. This e-book will give you the data had to layout company networks. via interpreting this e-book, you are going to achieve a radical figuring out of designing routed and switched community infrastructures and companies inside of a modular structure. In Designing for Cisco Internetwork suggestions (DESGN), moment version, you are going to research a vast variety of community layout rules and instructions. you are going to know about community layout within the context of the Cisco Service-Oriented community structure (SONA) framework and the Cisco firm structure. particular issues contain campus and knowledge heart infrastructure, distant connectivity, IP addressing layout, routing protocol choice, voice community layout, instant community layout, and together with defense on your designs. An ongoing case learn plus chapter-ending overview questions illustrate and aid solidify the recommendations awarded within the e-book. no matter if you're getting ready for CCDA certification or just are looking to achieve a greater realizing of community layout ideas, you are going to enjoy the origin details provided during this e-book. Designing for Cisco Internetwork strategies (DESGN), moment variation, is a part of a advised studying course from Cisco that incorporates simulation and hands-on education from approved Cisco studying companions and self-study items from Cisco Press. to determine extra approximately instructor-led education, e-learning, and hands-on guideline provided by means of approved Cisco studying companions around the globe, please stopover at www.cisco.com/go/authorizedtraining. Diane Teare is a qualified within the networking, education, and e-learning fields. She has greater than twenty years of expertise in designing, imposing, and troubleshooting community and software program and has additionally been occupied with educating, direction layout, and venture administration. She has vast wisdom of community layout and routing applied sciences and is an teacher with one of many biggest approved Cisco studying companions. * comprehend the Cisco imaginative and prescient of clever networks and the SONA framework * the right way to constitution and modularize community designs in the Cisco firm structure * layout easy campus and knowledge middle networks * construct designs for distant connectivity with WAN applied sciences * Create IPv4 addressing schemes * comprehend IPv6 layout * decide upon the best routing protocol for varied modules within the Cisco company structure * layout uncomplicated VoIP and IP telephony networks * comprehend instant layout rules * construct safety into your community designs
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Following that section, the operation of sequence and acknowledgment numbers and windowing are described; these are crucial to understanding TCP operation. Port Numbers KEY TCP and UDP use protocol port numbers to distinguish among multiple applications that POINT are running on a single device. Well-known, or standardized, port numbers are assigned to applications so that different implementations of the TCP/IP protocol suite can interoperate. Well-known port numbers are numbers up to 1023; examples include the following: ■ FTP: TCP port 20 (data) and port 21 (control) ■ TFTP: UDP port 69 ■ SMTP: TCP port 25 ■ POP3: TCP port 110 ■ HTTP: TCP port 80 ■ Telnet: TCP port 23 ■ DNS: TCP and UDP port 53 ■ SNMP: UDP port 161 Introduction to the TCP/IP Suite 21 Port numbers from 1024 through 49151 are called registered port numbers; these are registered for use by other applications.
By using logical Layer 3 addresses, routers allow devices on different LANs to communicate with each other and with distant devices—for example, those connected through the Internet or through a WAN. Examples of logical Layer 3 addresses include TCP/IP’s IP addresses and Novell’s IPX addresses. A device connected to a router does not receive any of the information meant just for devices on other ports, or broadcasts (destined for all networks) from devices on other ports. The router reads the source and destination logical addresses in the packets and therefore keeps track of who is where, and who is talking to whom, and sends data only where it needs to go.
A few, such as ISDN, also function at Layer 3. The service you use depends on many factors, including what is available where you are and, of course, the cost of the service. Some of the common WAN technologies include the following: ■ Packet-switched network: A network that shares the service provider’s facilities. The service provider creates permanent virtual circuits and switched virtual circuits that deliver data between subscribers’ sites. Frame Relay is an example of a packet-switched network.