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

By Angelescu S.

Go your CCNA examination and improve 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 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 publication as a reference when you get your CCNA certification and that fab task! easy education — evaluation LANs, WANs, Cisco and software program, TCP/IP, and community layout Switches and routers — learn how 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 — research community safety threats, top practices, entry keep an eye on lists, handling firewalls, and extra a large internet — know about wide-area community connection varieties, DSL networks, facts encapsulation protocols, and authentication equipment Open the booklet and locate: What hubs, bridges, switches, and routers are for All approximately TCP/IP layers andprotocols the aim of a data-link change tips on how to deal with a router utilizing Cisco IOS What to do with WLAN provider units the best way to deal with universal community safeguard threats easy methods 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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IPv4 is currently the most widely used version. ✦ ICMP: Internet Control Message Protocol is used to send error and status messages about network operations and available services, mostly by host and network devices. The most typical use of ICMP is the ping command, which allows you to verify whether a host or network device is reachable over the IP network from another host or network device. ✦ IPsec: Internet Protocol Security is used to secure IP data packet deliveries. The Internet Protocol (IP) is the most important TCP/IP protocol that operates at the network layer.

UDP is not as chatty as TCP: Hosts that transfer data using TCP need to exchange many segments just to open a connection during the three-way handshake process. They need to exchange many more segments to acknowledge reception of every single data segment. These flow control data segments add some overhead to TCP transmissions. UDP does not add flow control overhead because ✦ UDP is connectionless, so there’s no need to send segments to do a three-way handshake to establish a connection. ✦ UDP makes no use of sequencing.

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. Layer 5: Session Some applications need to open logical communication channels between the computer hosts.

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