CCNA Certification All-In-One For Dummies (7 books in 1) by Angelescu S.

By Angelescu S.

Cross your CCNA examination and improve your occupation — heres simply what you wish! The call for for Cisco qualified community affiliates is up, so upward thrust to the problem and get your certification! This consultant covers the entire 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 groovy activity! simple education — evaluate 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 communique innovations and WLAN criteria, operation modes, carrier units, and Cisco Unified instant Networks structure consider safe — learn community safeguard threats, top practices, entry keep watch over lists, handling firewalls, and extra a large web — know about wide-area community connection varieties, DSL networks, information encapsulation protocols, and authentication equipment Open the ebook and locate: What hubs, bridges, switches, and routers are for All approximately TCP/IP layers andprotocols the aim of a data-link change the way to deal with a router utilizing Cisco IOS What to do with WLAN provider units how you can deal with universal community defense threats find out how to deal with VoIP on Cisco switches Authentication equipment for WANs 7 books in 1 Networking fundamentals coping with TCP/IP Switching with Cisco Switches Routing with Cisco Routers instant Networks community safety Wide-Area Networks (WANs)

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Extra info for CCNA Certification All-In-One For Dummies (7 books in 1)

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Web browser: Browsers also use the MIME protocol to convert nonHTML contents in Web pages. Layer 5: Session The session layer maintains a logical communication channel between a network application running on the sending host and a network application running on the receiving host. Sometimes the session layer also provides authentication services when sessions are established. The following TCP/IP protocols are found at Layer 5: ✦ Telnet: A protocol used to open login sessions on a computer host.

Ring: Hosts are connected sequentially in a daisy-chain fashion, as shown in Figure 1-3. Traffic flows around the ring. The last host in the ring is connected to the first host, thereby closing the ring. Token Ring is the typical ring topology example. Fiber Distributed Data Interface (FDDI) is also a ring topology. ✦ Bus: As shown in Figure 1-4, hosts are connected through a single cable, usually coaxial cable. Ethernet networks using coaxial cable are bus topologies. Topologies of Computer Networks Host A Hub Host D Host E Host F Host A Host B Host C Figure 1-3: Ring topology.

Book I Chapter 2 20 Benefits of the OSI Reference Model ✦ The network communication problem is divided into smaller problems. By dividing the network communication process into several precise tasks and by assigning a specific layer to each task, it’s easier to manage the whole process. It also allows each layer to specialize to specific network communication contexts. For example, the physical layer constantly changes to support new transmission media. However, other layers do not need to change because the physical layer interacts using the same interfaces with upper layers, even if a new transmission medium is added to the support list.

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