Summary:Configuring standard ACLs is a skill you'll use on all your Cisco exams.  Learn the basics from Chris Bryant, CCIE #12933. Keywords:cisco, ccna, exam, pass, certification, access, list, standard, wildcard, mask, extended, named Article Body:Access Control Lists (ACLs) allow a router to permit or deny packets based on a variety of criteria.   The ACL is configured in global...

Summary: Why use loopback interfaces? Learn the details in this Cisco CCNA tutorial from Chris Bryant, CCIE #12933. Keywords: cisco, ccna, certification, exam, pass, how, loopback, interface, 127.0.0.1, ping, pc, reserved Article Body: As a CCNA candidate, you most likely have some background in PC hardware and workstation support. If so, you're already familiar with loopback interfaces,...

Summary:Mapping the OSI model to the TCP/IP model is a vital skill for CCNA exam success.  Learn the details of both models from Chris Bryant, CCIE #12933. Keywords:Ccna, exam, certification, tcp, ip, model, networking, osi, session, transport, application, network, mapping, map, free, tutorial Article Body:The OSI model is the model that most networking personnel are familiar with, but to...

Summary:To pass the CCNP, you've got to know the details of each layer of Cisco's three-layer networking model.  Learn these important details from Chris Bryant, CCIE #12933. Keywords:cisco, ccnp, exam, certification, bcmsn, core, layer, three, model, networking, switch, pass, ccie Article Body:In this section, you're going to be reintroduced to a networking model you first saw in your...

Summary:To work with BGP and pass the BSCI exam, you've got to know and understand the BGP adjacency states.  Learn the details from Chris Bryant, CCIE #12933. Keywords:ccnp, bsci, bgp, adjacency, peer, state, open, opensent, active, free, exam, pass, tutorial, state Article Body:To pass the BSCI exam, earn your CCNP certification, and become an outstanding networker, you've got to master...

Summary:Quality of Service is a huge topic on the CCNP exams and production networks.  Learn the basics of writing QoS policy from Chris Bryant, CCIE #12933. Keywords:Cisco, ccnp, exam, quality, of , service, qos, policy, class, map, access, list, apply, interface, pass, free, chris, Bryant, ccie, 12933, advantage Article Body:QoS - Quality of Service - is a huge topic on both the BCMSN...

  Summary:In this article I will explain how the Internet works, all the way from what goes through the wires and how the wires across the globe connect, to how meaningful activities are performed on your computer. Unlike other Internet articles, I won't try to explain the history behind the Internet of today – it's complex enough, and like me, you probably don't care very much. I...

Summary:HyperTerminal is communications software used to connect to other computers over modems, RS-232 serial connections, or telnet. In order to use HyperTerminal, the user will have to know details about the computer they wish to connect to, such as the number to dial or the IP address. Keywords:hyperterminal, software, modem Article Body:HyperTerminal is communications software used to...

Summary:The Address Resolution Protocol is designed to ease communication in TCP/IP networks through accelerated methods of finding host hardware addresses when the network layer is known. Keywords:arp cache Article Body:The Address Resolution Protocol is designed to ease communication in TCP/IP networks through accelerated methods of finding host hardware addresses when the network layer is...

Summary:SIP or Session Initiated Protocol is one of the most popular methods of Internet Telephony today. Keywords:free pc to phone international call, unlimited pc to phone call Article Body:SIP or Session Initiated Protocol is one of the most popular methods of Internet Telephony today. Wikipedia defines SIP as “an application-layer control (signaling) protocol for creating, modifying,...