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

By Angelescu S.

Go your CCNA examination and strengthen your occupation — 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 the entire things 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 publication as a reference once you get your CCNA certification and that fab activity! easy education — overview 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, provider units, and Cisco Unified instant Networks structure suppose safe — research community safety threats, most sensible practices, entry regulate lists, coping with firewalls, and extra a large internet — 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 swap the best way to deal with a router utilizing Cisco IOS What to do with WLAN carrier units find out how to deal with universal community protection threats find out how to deal with VoIP on Cisco switches Authentication tools for WANs 7 books in 1 Networking fundamentals handling TCP/IP Switching with Cisco Switches Routing with Cisco Routers instant Networks community safety Wide-Area Networks (WANs)

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This is usually the case in serial connections. Figure 1-1: Pointto-point topology. Host A Host B ✦ Star: Hosts connect to a central device, as shown in Figure 1-2. All traffic flows through the central device. The star topology is also known as a hub-and-spoke topology. Ethernet networks using hubs or switches and twisted-pair cabling are star topologies. ✦ 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.

49152–65535: Private TCP/IP ports. These ports are available for anyone to use. Companies that write network applications typically allow the users to configure the TCP/IP ports manually in this port number range. This is a flexible and reliable solution for most network applications. Table 3-1 lists some well-known reserved TCP/IP ports. Table 3-1 Some Well-Known TCP/IP Ports TCP Port UDP Port HTTP 80, 8080 DHCP 67, 68 HTTPS 443 SNMP 161 SMTP 25 BOOTP 67,68 DNS 53 RIP 520, 521 POP 110 NTP 123 Telnet 23 IRC 194 SSH 22 SMB 445 FTP 20, 21 Syslog 514 Layer 3: Network One of the most important functions of network layer devices and protocols is choosing the best route to send packets between hosts.

For example, mail messages contain various data formats: text, application attachments, video, audio, and graphical signature. ✦ The presentation layer on the sending host receives the data payload from the application layer. ✦ The presentation layer on the sending host converts the data into a format that is easily transportable over the network. ✦ The presentation layer on the receiving host converts the data from the network format back to its native format that can be easily interpreted, used, and displayed by the application layer above.

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