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1). Cisco CCNA Exam Tutorial: Troubleshooting Directly Connected Serial Interfaces By : Chris Bryant, CCIE #12933
CCNA exam success depends largely on noticing the details, and this is especially true of configurations involving directly connected serial interfaces. And of course, it's not enough to notice these details - you've got to know what to do about them!
A Cisco router is a DTE by default, but directly connecting two DTEs with a DCE/DTE c...
2). Cisco CCNP / BCSI Exam Tutorial: Broadcasts And The IP Helper-Address Command By : Chris Bryant, CCIE #12933
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 ...
3). CCNA / CCNP Home Lab Tutorial: The VLAN.DAT File By : Chris Bryant, CCIE #12933
CCNA and CCNP candidates who have their own Cisco home labs often email me about an odd situation that occurs when they erase a switch's configuration. Their startup configuration is gone, as they expect, but the VLAN and VTP information is still there!
Sounds strange, doesn't it? Let's look at an example. On SW1, we run show vlan brie...
4). Cisco CCNP / BCMSN Exam Tutorial: Changing Root Bridge Election Results By : Chris Bryant, CCIE #12933
Your BCMSN and CCNP studies will include mastering the details of Spanning Tree Protocol (STP). While you learned some of these details in your CCNA studies, quite a bit of it may be new to you. Before going on to the intermediate and advanced STP features, let's review the root bridge election process and learn how to change these results.
5). Cisco CCNP / BCSI Exam Tutorial: Configuring EIGRP Packet Authentication By : Chris Bryant, CCIE #12933
Configuring RIPv2 and EIGRP authentication with key chains can be tricky at first, and the syntax isn't exactly easy to remember. But for BSCI and CCNP exam success, we've got to be able to perform this task.
In a previous tutorial, we saw how to configure RIPv2 packet authentication, with both clear-text and MD5 authentication schemes...
6). Cisco CCNA Certification Exam Tutorial: The OSPF RID By : Chris Bryant, CCIE #12933
OSPF is a major topic on your CCNA exam, as well it should be. OSPF is a widely-used WAN protocol, and you need to learn the fundamentals before moving on to more complicated configurations. One such detail is the OSPF Router ID, or RID.
The RID is the dotted decimal value by which other OSPF routers will identify a given OSPF router. ...
7). Cisco CCNP / BSCI Exam Tutorial: EIGRP Route Summarization By : Chris Bryant, CCIE #12933
Summarizing routes is a vital skill to learn to pass the BSCI exam and get one step closer to earning your CCNP. The actual binary conversions are only part of the test, though! You've got to know how to correctly apply the summary routes, and that differs from one protocol to the next. In the last few CCNP / BSCI tutorials, we've looked at using t...
8). CCNP Certification / BCMSN Exam Tutorial: HSRP MAC Addresses And Timers By : Chris Bryant, CCIE #12933
To earn your CCNP certification and pass the BCMSN exam, you've got to know what HSRP does and the many configurable options. While the operation of HSRP is quite simple (and covered in a previous tutorial), you also need to know how HSRP arrives at the MAC address for the virtual router - as well as how to configure a new MAC for this virtual rout...
9). Cisco CCNA / CCNP Home Lab Tutorial: Configuring An Access Server By : Chris Bryant, CCIE #12933
As your CCNA / CCNP home lab expands, an access server such as the Cisco 2509 or 2511 is one of the best investments you can make. In this article, we'll look at the basic configuration for an access server and discuss how to connect to the other routers and switches in your pod through the AS.
Here's part of a configuration from one o...
10). Cisco CCNP / BSCI Exam Tutorial: OSPF Route Redistribution Review By : Chris Bryant, CCIE #12933
OSPF route redistribution is an important topic on the BSCI exam, and it's a topic full of details and defaults that you need to know for the exam room and the job. To help you pass the BSCI exam, here's a quick review of some of the OSPF route redistribution basics.
To see if a router is an ABR or ASBR, run show ip ospf. This also dis...
11). Cisco CCNA Certification Exam Tutorial: Access List Details You Must Know! By : Chris Bryant, CCIE #12933
To pass the CCNA exam, you have to be able to write and troubleshoot access lists. As you climb the ladder toward the CCNP and CCIE, you'll see more and more uses for ACLs. Therefore, you had better know the basics!
The use of "host" and "any" confuses some newcomers to ACLs, so let's take a look at that first.
It is accep...
12). Cisco CCNA / CCNP Home Lab Tutorial: Using 2520 Routers By : Chris Bryant, CCIE #12933
I know from experience that part of the excitement and anxiety of putting together your own CCNA / CCNP home lab is deciding what to buy! While you can make a workable home lab out of almost any combination of Cisco routers and switches, some routers are better suited for home lab work than others because they can fill multiple roles.
...
13). Cisco CCNP / BSCI Certification: Introduction To ISIS Terminology By : Chris Bryant, CCIE #12933
When you're studying to pass the BSCI exam and earn your CCNP certification, you're going to be introduced to ISIS. ISIS and OSPF are both link-state protocols, but ISIS works quite differently from OSPF. You must master these details in order to earn your CCNP.
One of the major differences between OSPF and ISIS will be evident to you ...
14). Cisco CCNA / CCNP Home Lab Setup: How To Configure Reverse Telnet By : Chris Bryant, CCIE #12933
Occasionally, during your CCNA and CCNP studies, you'll run into a term that just doesn't quite make sense to you. (Okay, more than occasionally!) One such term is "reverse telnet". As a Cisco certification candidate, you know that telnet is simply a protocol that allows you to remotely connect to a networking device such as a router or switch. But...
15). Cisco CCNA Exam Tutorial: Using Trivial File Transfer Protocol (TFTP) By : Chris Bryant, CCIE #12933
One of the first things you do when you start studying for the CCNA exam is memorizing a list of port numbers and the protocols that run on those ports. If you're an experienced networker, you know most of the protocols that are mentioned - DNS, DHCP, FTP, SMTP, and so on. But there's one protocol that you might not have experience with, but is act...
16). Cisco CCNA / CCNP Home Lab: Why You Need An ISDN Simulator By : Chris Bryant, CCIE #12933
ISDN is a vital topic for today's CCNA and CCNP candidates, especially for the ICND and Intro exams - you've got to know ISDN inside and out to pass those exams. Naturally you want to include it in your home lab. What many candidates don't realize is that you can't connect two Cisco routers directly via their Basic Rate Interface (BRI) interfaces y...
17). Cisco CCNP Certification / BCMSN Exam Tutorial: Writing QoS Policy By : Chris Bryant, CCIE #12933
QoS - Quality of Service - is a huge topic on both the BCMSN exam and real-world networks. QoS is so big today that Cisco's created separate specialist certifications that cover nothing but QoS! It can be an overwhelming topic at first, but master the fundamentals and you're on your way to exam and job success.
If you work with QoS at ...
18). Cisco CCNP Certification / BSCI Exam Tutorial: ISIS Hellos And Adjacencies By : Chris Bryant, CCIE #12933
In my last ISIS tutorial, I mentioned that while ISIS and OSPF are both link state protocols, their actual operation differs greatly. To pass the BSCI exam and earn your CCNP, you'll need to know these differences! Today, we'll take a look at ISIS Hello types and the adjacency types that form through the use of these Hellos.
Hello pack...
19). Cisco CCNA Certification Exam Tutorial: Configuring Dialer Profiles By : Chris Bryant, CCIE #12933
The most common method of configuring ISDN is with dialer maps, but dial information can also be configured on a logical interface. To pass the CCNA exam, you must know how to configure and troubleshoot both dialer maps and dialer profiles.
Dialer Profiles allow different dialing information to be configured onto logical interfaces. Th...
20). Cisco CCNP / BCMSN Exam Tutorial: Switches, QoS, And Cisco's Networking Model By : Chris Bryant, CCIE #12933
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 c...
21). What To Expect When Taking Your First Cisco Certification Exam By : Chris Bryant, CCIE #12933
Cisco Certification: Taking Your First Certification Exam
You’ve studied hard you’ve practiced your configurations you’ve used your flash cards over and over again and finally, the big day is here. Your first certification exam!
For many Cisco certification candidates, their first exam is the CCNA Composite exam or one of ...
22). Passing Your CCNA and CCNP: Configuring And Troubleshooting Router-On-A-Stick By : Chris Bryant, CCIE #12933
For CCNA and CCNP candidates, it's hard not to laugh the first time you hear the phrase "router on a stick". Let's face it, that's a pretty silly term. But as those who have passed the CCNA and CCNP exams know, this is a vital exam topic that you must know how to configure and troubleshoot.
Basic Cisco theory states that for hosts in ...
23). Cisco CCNA / CCNP Certification: How And Why To Build An Etherchannel By : Chris Bryant, CCIE #12933
CCNA and CCNP candidates are well-versed in Spanning-Tree Protocol, and one of the great things about STP is that it works well with little or no additional configuration. There is one situation where STP works against us just a bit while it prevents switching loops, and that is the situation where two switches have multiple physical connections.
24). Cisco CCNP / BSCI Exam Tutorial: Configuring And Troubleshooting OSPF Virtual Links By : Chris Bryant, CCIE #12933
Knowing when and how to create an OSPF virtual link is an essential skill for BSCI and CCNP exam success, not to mention how important it can be on your job! As a CCNA and CCNP candidate, you know the theory of virtual links, so let's take a look at how to configure a virtual link, as well as some real-world tips that many CCNA and CCNP study guide...
25). CCNA / CCNP Home Lab Tutorial: Assembling Your Cisco Home Lab By : Chris Bryant, CCIE #12933
A CCNA or CCNP candidate who wants to be totally prepared for their exams is going to put together a home lab to practice on. With used Cisco routers and switches more affordable and plentiful then ever before, there's really no excuse to not have one!
With the many different models available, there is some understandable confusion amo...
26). CCNP Certification / BCMSN Exam Tutorial: Getting Started With HSRP By : Chris Bryant, CCIE #12933
Defined in RFC 2281, HSRP is a Cisco-proprietary protocol in which routers are put into an HSRP router group. Along with dynamic routing protocols and STP, HSRP is considered a high-availability network service, since all three have an almost immediate cutover to a secondary path when the primary path is unavailable.
One of the routers...
27). CCNP / BSCI Exam Tutorial: Route Summarization And The OSPF Null Interface By : Chris Bryant, CCIE #12933
CCNP exam success, particularly on the BSCI exam, demands you understand the details of route summarization. This skill not only requires that you have a comfort level with binary conversions, but you have to know how and where to apply route summarization with each individual protocol.
You also have to know the "side effects" of route...
28). How To Earn Cisco’s Firewall Specialist Certification By : Chris Bryant, CCIE #12933
Security is a hot topic in today's networks, and will continue to be for a long time to come. With that in mind, you must consider adding a Cisco security certification to your resume and firewall skills to your skill set.
It's quite a jump from the CCNA to the CCSP (Cisco Certified Security Professional), and Cisco has made that leap ...
29). Cisco CCNA Exam Tutorial: Route Summarization By : Chris Bryant, CCIE #12933
Preparing to pass the CCNA exam and earn this important Cisco certification? Route summarization is just one of the many skills you'll have to master in order to earn your CCNA. Whether it's RIP version 2, OSPF, or EIGRP, the CCNA exam will demand that you can flawlessly configure route summarization.
Route summarization isn't just imp...
30). Cisco CCNA Certification Exam Tutorial: RIP Details You Must Know By : Chris Bryant, CCIE #12933
RIP isn't exactly the most complex routing protocol on the CCNA exam, but that makes it easy to overlook some of the important details you must keep in mind in order to pass the exam! To help you review for the exam, here are just a few of those details!
RIP’s default behavior is to send version 1 updates, but to accept both version 1 ...
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