 Category :: Computer Certification Articles |
Author :: Chris Bryant  |
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| Article Title :: Cisco CCNA Certification Exam Tutorial: ISDN Details You Must Know |
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| CCNA exam success depends partially on knowing the details of ISDN, and there are plenty of them! To help you review for your CCNA exam, here are a few ISDN details that you must know on exam day. (They help in the real world, too – and there are still plenty of ISDN networks out there!The Cisco-proprietary version of HDLC is the default encapsulation type for serial and ISDN interfaces.R2#show interface serial0Serial0 is up, line protocol is upHardware is HD64570MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255Encapsulation HDLC, loopback not set, keepalive set (10 sec)While there’s only one D-channel in BRI, PRI (read full article) |
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| Category :: Computer Certification Articles |
Author :: Chris Bryant |
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| Article Title :: Cisco CCNP / BCMSN Exam Tutorial: Configuring CGMP On Routers & Switches |
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| If a Layer Two switch doesn't have the capabilities to run IGMP Snooping, it will be able to run CGMP - Cisco Group Membership Protocol. CGMP allows the multicast router to work with the Layer Two switch to eliminate unnecessary multicast forwarding.CGMP will be enabled on both the multicast router and the switch, but the router's going to do all the work. The router will be sending Join and Leave messages to the switch as needed. PIM must be running on the router interface facing the switch before enabling CGMP, as you can see:R1(config)#int e0R1(config-if)#ip cgmpWARNING: CGMP requires PIM enabled on interfaceR1(config-if)#ip pim sparseR1(con (read full article) |
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| Category :: Computer Certification Articles |
Author :: Mark Kessler |
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| Article Title :: What You Must Do to Get a MCSE Certification |
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| Being an MCSE, or Microsoft Certified Systems Engineer, can bring in some good money and give you a greater range of jobs to be obtained. To obtain an MCSE certification, you need to be able to pass six core curriculum exams, an elected exam, and a design course exam. While most will go to university for an MCSE certification, they can be obtained through online courses and by studying online guides. Taking the exam and passing with at least an eighty five percent is needed to become a certified MCSE according to an MCSE who took the actual Microsoft courses.MCSE study material ranges from books that can be ordered and sent to you to purchased and downloaded to you (read full article) |
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| Category :: Computer Certification Articles |
Author :: Chris Bryant |
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| Article Title :: Cisco CCNA / CCNP Home Lab Tutorial: The 2501 Router |
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| To be truly prepared for your CCNA and CCNP exams, you need real hands-on experience with real Cisco routers and switches. However, a production network is a really bad place to practice your configurations, but an excellent way to get fired and/or sued. The key to becoming a true CCNA and CCNP is assembling your own Cisco home lab.You don't have to spend a lot of money to do so; used Cisco equipment is cheaper than ever. It's robust as well - I've bought literally hundreds of used routers and switches over the years and have had very few problems. I owe much of my skill to practicing configurations and troubleshooting in my own home lab.2501 routers are fantastic for C (read full article) |
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| Category :: Computer Certification Articles |
Author :: Chris Bryant |
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| Article Title :: Cisco CCNP / BCSI Exam Tutorial: Broadcasts And The IP Helper-Address Command |
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| While routers accept and generate broadcasts, they do not forward them. This can be quite a problem when a broadcast needs to get to a device such as a DHCP or TFTP server that's on one side of a router with other subnets on the other side.If a PC attempts to locate a DNS server with a broadcast, the broadcast will be stopped by the router and will never get to the DNS server. By configuring the ip helper-address command on the router, UDP broadcasts such as this will be translated into a unicast by the router, making the communication possible. The command should be configured on the interface that will be receiving the broadcasts.R1(config)#int e0R1(config-if)#ip (read full article) |
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| Category :: Computer Certification Articles |
Author :: Chris Bryant |
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| Article Title :: Cisco CCNP / BCMSN Exam Tutorial: Switches, QoS, And Cisco's Networking Model |
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| QoS is a big topic on your BCMSN and CCNP exams, and for good reason. As more and more traffic flows through today's networks, accurately applying QoS to both your routers and switches becomes more important.Note the phrase "accurately applying". You must have a plan in place before you start configuring QoS on your switches, and to create such a plan you should use Cisco's Three-layer Hierarchical Model.This model breaks switches down into three main groups - Access, Distribution, and Core. You're familiar with these groups from your CCNA studies, and now you've got to apply this knowledge.The QoS workload should be borne by the Access and Distribution layers, bec (read full article) |
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| Category :: Computer Certification Articles |
Author :: Chris Bryant, CCIE #12933 |
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| Article Title :: Cisco CCNA Certification Exam Tutorial: Configuring And Troubleshooting VTP |
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| Not only is your CCNA exam going to have questions on VLAN trunking protocol, almost any network that has more than one VLAN is going to have VTP running. Whether you're planning on passing the CCNA exam or just brushing up on your networking skills, this VTP tutorial will help you learn the basics of this important protocol.
VTP allows switches to advertise VLAN information between other members of the same VTP domain. VTP allows a consistent view of the switched network across all switches. When a VLAN is created on one switch in a VTP server, all other VTP devices in the domain are notified of that VLAN’s existence. VTP servers will know about every VLAN, even VLANs that ha (read full article) |
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| Category :: Computer Certification Articles |
Author :: Chris Bryant, CCIE #12933 |
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| Article Title :: Cisco CCNP / BSCI Exam Tutorial: Ten IP Routing Details You Must Know! |
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| To pass the BSCI exam and earn your CCNP, you've got to keep a lot of details in mind. It's easy to overlook the "simpler" protocols and services such as static routing and distance vector protocols. With this in mind, here's a quick review of some details you should know for success in the exam room and real-world networks!
When packets need to be routed, the routing table is parsed for the longest prefix match if multiple paths exist with the same prefix length, the route with the lowest AD is preferred. If there are still multiple valid paths, equal-cost load-sharing goes into effect.
The ip route command is used to create static routes the command ip route 0.0.0 (read full article) |
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| Category :: Computer Certification Articles |
Author :: Chris Bryant, CCIE #12933 |
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| Article Title :: Cisco CCNP / BCMSN Exam Tutorial: Changing The Active Router In HSRP |
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| To pass the BCMSN exam and earn your CCNP certification, you've got to know HSRP inside and out. While the operation and basic commands of HSRP are pretty simple, there are some important details that are easily overlooked but are vital in getting HSRP to work the way you want it to. Let's take a look at using the priority command correctly on both the exam and in production networks.
A key value in the show standby command is the priority. The default is 100, and the router with the highest priority will be the primary HSRP router. We'll raise the default priority on R2 and see the results. R3 is currently the Active router and R2 the standby, so let's raise the priority on R2 (read full article) |
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| Category :: Computer Certification Articles |
Author :: Chris Bryant |
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| Article Title :: Cisco CCNA Certification Exam Tutorial: Frame Relay DLCIs And Mappings |
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| Passing the CCNA is tough, and one of the toughest parts is keeping all the acronyms straight! Frame Relay has plenty of those, and today we're going to examine what DLCIs do and how they're mapped on a Cisco router.Frame Relay VCs use Data-Link Connection Identifiers (DLCI - pronounced "del-see") as their addresses. Unlike other Cisco technologies, VCs have only a single DLCI in their header. They do not have a source and destination.DLCIs have local significance only. DLCI numbers are not advertised to other routers, and other routers can use the same DLCI numbers without causing connectivity issues.Cisco uses the term global addressing to describe a technique by (read full article) |
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