his 1Z0-042 is a examination linked with Oracle and hence it is Oracle Certified. The mane of this 1Z0-042 exam is Oracle Database 10g: Administrator I and this is an authorized exam of Oracle. The Database specialist will mostly take this exam as this will provide them extra qualification for them in this competitive IT field.
The associated certifications of this examination are 10g DBA OCA and the price of this exam is $125 of USD and the examination duration is 120 minutes and in that time period candidates have to answer 84 questions and also they have to take a minimum score of 68% to clear this exam.
How to Prepare:
This 1Z0-042 examination is validated against 10g and 10g R2. This examination needs class room training, practicing and gaining experience on both the 10g and 10g R2 to prepare well for this exam. There is also Self Study CD Course (SSCDs) which helps the candidates to prepare in an efficient way by reviewing their topics in a faster way. There are two practice exams for this and they are Oracle Authorized exam from Self Test Software and Transcender and this two practice exams will be very useful for the candidates who are preparing for the exams.
There are various exam topics which they have to be well prepared before writing examination. Those topics are:
Architecture, Installing the Oracle Database Software, Creating an Oracle Database, Managing the Oracle Instance, Managing Database Storage Structures, Administering User Security, Managing Schema Objects, Managing Data and Concurrency, Managing Undo Data, Implementing Oracle Database Security, Configuring the Oracle Network Environment, Proactive Maintenance, performance Management, Recovery and Backups and some database related topics.
Candidates can clear this Oracle exam in their first attempt only if they are well versed in all these topics. So candidates have to spend more time in preparing for this exam and hence they can clear the exam at their first attempt.
Cisco CCNA certification exam training means you need to learn a lot of new terms, and some of them can be a little problematic at first view.
To pass this hard certification exam,you definitely need to understand one term which is packet switching. The first question, of course, is “What is packet switching in the first place?” In today’s Cisco CCNA exam prep tutorial we will learn about this term.
Packets transmitted from “point A” to “point B” all have to arrive at the same destination, but with packet switching, they do not all have to take the same path to get there. If you and I are standing 10 feet apart and I want to throw a rugby ball to you, I’ve got some options. I could bounce the ball off the floor to you, I could throw it directly to you, or I could send it up into the air to you. Packet switching is pretty the same thing – packets will take different paths to get from source to destination, but the result is that all the packets arrive at the destination. Then they are then reassembled to take the form of the original message.
Packet switching may sound a little odd, but this is the most efficient way of transporting the data. Frame Relay is a packet switching technology, as is X.25, and both of these standards are very efficient.
When we have packets that must arrive at the destination in the same order in which they left the source, packet switching is not the best choice. For this situation, we’ll need to use something like circuit switching, and we’ll discuss that in tomorrow’s Cisco CCNA certification training article!
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You remember from your CCNA studies that when a port goes through the transition from blocking to forwarding, youre looking at a 50-second delay before that port can actually begin forwarding frames.
Configuring a port with PortFast is one way to get around that, but again, you can only use it when a single host device is found off the port. What if the device connected to a port is another switch?
A switch can be connected to two other switches, giving that local switch a redundant path to the root bridge, and thats great – we always want a backup plan! However, STP will only allow one path to be available, but if the available path to the root switch goes down, there will be a 50-second delay due to the STP timers MaxAge and ForwardDelay before the currently blocked path will be available.
The delay is there to prevent switching loops, and we cant use PortFast to shorten the delay since these are switches, not host devices. What we can use is Uplinkfast.
The ports that SW3 could potentially use to reach the root switch are collectively referred to as an uplink group. The uplink group includes the ports in forwarding and blocking mode. If the forwarding port in the uplink group sees that the link has gone down, another port in the uplink group will be transitioned from blocking to forwarding immediately. Uplinkfast is pretty much PortFast for wiring closets. (Cisco recommends that Uplinkfast not be used on switches in the distribution and core layers.)
Some additional details regarding Uplinkfast:
The actual transition from blocking to forwarding mode takes about three seconds.
Uplinkfast cannot be configured on a root switch.
Uplinkfast is configured globally. You cant run Uplinkfast on some ports or on a per-VLAN basis – its all or nothing.
The original root port will become the root port again when it detects that its link to the root switch has come back up. This does not take place immediately. The switch uses the following formula to determine how long to wait before transitioning back to the forwarding state:
( 2 x FwdDelay) + 5 seconds
Uplinkfast will take immediate action to ensure that the switch upon which it is configured cannot become the root switch. First, the switch priority will be set to 49,152, which means that if all other switches are still at their default priority, theyd all have to go down before this switch can possibly become the root switch. Additionally, the STP Port Cost will be increased by 3000, making it highly unlikely that this switch will be used to reach the root switch by any downstream switches.
And you just know theres got to be at least one option with this command, right? Lets run IOS Help and see.
SW2(config)#spanning-tree uplinkfast ?
max-update-rate Rate at which station address updates are sent
When there is a direct link failure, dummy multicast frames are sent to the MAC destination 0100.0ccd.cdcd. The max-update-rate value determines how many of these frames will be sent in a 100-millisecond time period.
Mastering the details of UplinkFast, BackboneFast, BPDU Guard, and Loop Guard are vital to your success on the CCNP exams, and one or more of these features are in use on almost every network in the world. Learn these features for success in both the exam room and the real world!
A CCIE is Cisco’s highest professional certification level and opens the door to many unique career opportunities. There are three different levels of Cisco Certification, each with their own sub categories, Associate, Professional, and Expert. Expert describes the CCIE certification level. It is estimated that there are only about 17,000 professionals in the entire world that hold this level of certification which is considered to be the highest level of IT certification, and has the highest salary track record in the profession.
While there is no formal requirement for taking the two part certification test, it is recommended that candidates have at least three to five years of IT experience. Many candidates build labs of their own to practice in, or rent time at locations where they can hone their skills. Passing the CCIE requires in-depth knowledge of many real-life networking situations. There is simply no substitute for being exposed to, designing, deploying, and troubleshooting a wide range of complex, real-world networks.
Candidates must also pass a qualifying exam to apply for CCIE certification, and then must pass the CCIE expert exam in their given track, as well as a laboratory component in which candidates demonstrate skills in different pressure-intensive scenarios. Candidates should be able to install, configure and maintain Voice solutions over IP networks. The CCIE Voice track, however, does not certify an understanding of the infrastructure over which VoIP solutions are implemented. Candidates need to keep in mind passport and visa details if traveling to another country to take the CCIE lab exam as well as factoring in the cost of the travel.
In addition, candidates must demonstrate a high level of expertise with devices such as SAN switches and directors, routers, switches and management solutions. The new CCIE builds on the success of three specialist certifications offered by Cisco to validate storage networking design, support, and sales skills. A high level of expertise with devices such as SAN switches and directors, routers, switches and management solutions. The new CCIE builds on the success of three specialist certifications offered by Cisco to validate storage networking design, support, and sales skills.
With the proper preparation it is possible to obtain this coveted certification. Extensive preparation is required, but the successful completion will provide greater career opportunities. It is estimated that some individuals even hold multiple certifications, which means that their possibilities for advancement and earnings increase in the IT field are virtually unlimited.
Promptly you’ve got your CCNA, you’re inclined to relocate on to the next constant, the Expert certifications. Exchange for years, Cisco had one Seasoned certification, the Cisco Certified Network Professional (CCNP) certification. One more time frequently, Cisco has expanded this straight of certifications to group the Cisco Certified Assurance Proficient (CCSP) and Cisco Certified Turn Professional (CCVP).
With security and publication being the two most in less than no time expanding areas of today’s networks, some late CCNAs heed booming after the CCSP or CCVP without essential adding the CCNP to their resume.
While it’s temping to fly up and gross a Cisco care or medium certification, the worst thing you can do in behalf of your networking occupation is fulfil your CCNP certification gold medal, then commit oneself to on the CCVP or CCSP.
Why? Because the CCNA is just now the gen of a entirely portly iceberg when it comes to routing and switching. It’s a identical substantial conclusion, and the CCNA is all joking aside the foundation of your networking craft, but you be in want of to combine on to that smooth out of entente routing and switching more willingly than active on to more specialized areas.
Two examples are OSPF and BGP. You learn to the theory of OSPF and some basic and intermediate configurations of that conduct in your CCNA studies, but the learning you into of OSPF in your CCNP studies is invaluable. As in support of BGP, there is no BGP in the CCNA curriculum, but it is a grievous idea to be suffering with some BGP experience in today’s networks. It’s also penetrating instead of your career.
I recognize it is a massive leading on to witter on after the insurance and voice certifications while not paying acclaim to the CCNP. Do yourself a huge favor and count up the tremendous amount of routing and switching intelligence needed pro the CCNP to your knowledgebase, and you can then manoeuvre on to the CCSP or CCVP. Even more intelligent, you’ll be better predisposed to climb the biggest certification mountain around – the CCIE!
An important part of your Cisco CCENT and 640-802 CCNA certification studies is learning the differences between RAM, ROM, NVRAM, and Flash memory. Learn these vital differences from Chris Bryant, CCIE #12933.
An important part of your Cisco CCENT and CCNA certification studies is learning the differences between RAM, ROM, NVRAM, and Flash memory. You better know the differences when it comes to working in real-life networks as well, because vital Cisco files are found in these memory types – and since some of these files are lost on a router reload and some are not, we better know which is which!
The memory types and functions discussed in this section are the same for routers and switches, but to keep from saying “routers and switches” 500 times, I’ll just say “routers”. 
Configuring the routers is a lot of fun, but we’ve got to know what’s going on inside the router, too! Cisco routers have four different kinds of memory, and while some of the names are similar, their purpose is totally different.
The contents of some of these memory types is kept when the router is reloaded, and others are lost on a reload. We better know which is which!
It’s a fair bet that these topics will come up on your CCENT and CCNA exams, and this is also information you’ve got to know to be a real network admin. Let’s examine these four memory types closely and see what each one does!
ROM: Read-Only Memory. ROM stores the router’s bootstrap startup program, operating system software, and power-on diagnostic test programs (POST).
Flash Memory: Generally referred to simply as “flash”, the IOS images are held here. Flash is erasable and reprogrammable ROM. Flash memory content is retained by the router on reload.
RAM: Random-Access Memory. Stores operational information such as routing tables and the running configuration file. RAM contents are lost when the router is powered down or reloaded. By default, routers look here first for an Internetwork Operating System (IOS) file during boot.
NVRAM: Non-volatile RAM. NVRAM holds the router’s startup configuration file. NVRAM contents are not lost when the router is powered down or reloaded.
Some important comparisons:
RAM contents are lost on reload, where NVRAM and Flash contents are not.
NVRAM holds the startup configuration file, where RAM holds the running configuration file.
Let’s take a look at the boot process of a Cisco router, and then talk about the dreaded Setup Mode!
The Router Boot Process
When a Cisco router powers up, it first runs a series of POSTs (Power-On Self Test). A POST is a series of diagnostic tests designed to verify the basic operation of the network interfaces, memory, and the CPU.
Depending on the model or router of switch you’re using, you can actually see some of these tests being passed. Here, I’ve reloaded a Cisco 2950 switch, and you can see some of the POSTs being run and passed at the very beginning of the bootup process.
Initializing flashfs…
flashfs[1]: 79 files, 3 directories
flashfs[1]: 0 orphaned files, 0 orphaned directori
flashfs[1]: Total bytes: 7741440
flashfs[1]: Bytes used: 5980672
flashfs[1]: Bytes available: 1760768
flashfs[1]: flashfs fsck took 7 seconds.
flashfs[1]: Initialization complete.
Done initializing flashfs.
POST: System Board Test : Passed
POST: Ethernet Controller Test : Passed
ASIC Initialization Passed
POST: FRONT-END LOOPBACK TEST : Passed
POSTs are particularly effective at detecting major problems early in the boot process, such as a broken fan. If the POST detects such a problem (usually called an “environmental factor”) that would cause the router or switch to overheat after booting, the POST will fail, give you a clear message as to why the POST failed, and will then stop the boot process.
But let’s speak positively here!
After the router passes the POST, it looks for a source from which to load a valid Internetwork Operating System (IOS). The router has three sources from which it can load an IOS image, and it’s a good idea to know these sources and the order in which the router will look in each for the IOS image:
1. Flash memory (the default).
2. A TFTP server. (Trivial File Transfer Protocol)
3. Read-Only Memory (ROM)
To change that order, a change must be made to the configuration register, and we’ll talk about that later in the course. It’s similar to the Microsoft Registry in that you should never change this value unless you are sure of the result.
Once the IOS is found, the router looks for a valid startup configuration file. By default, the router will look for the startup configuration file in Non-volatile RAM (NVRAM).
If no valid startup configuration file is found, the router enters setup mode, where the router runs the system configuration dialogue, a series of questions involving basic router setup. We’ll take a look at Setup Mode in the next installment of my exclusive 640-802 CCNA and CCENT certification exam tutorial series!
642-426 Exam
Troubleshooting Unified Communications (TUC)
Exam Number/Code : 642-426
Exam Name : Troubleshooting Unified Communications (TUC)
Questions and Answers : 48 Q&As
Update Time: 2010-05-28
Price: $ 79.00
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As part οf yοur CCNP certificatiοn exam studies, particularly fοr the ISCW exam, yοu need tο be very clear οn the differences between TACACS+ and RADIUS.
As a CCNA and future CCNP, yοu’ve already cοnfigured authenticatiοn in the fοrm οf creating a lοcal database οf usernames and passwοrds fοr bοth Telnet access and PPP authenticatiοn. This is sοmetimes called a self-cοntained AAA deplοyment, since nο external server is invοlved.
It’s mοre than likely that yοu’ll be using a server cοnfigured fοr οne οf the fοllοwing security prοtοcοls:
TACACS+, a Ciscο-prοprietary, TCP-based prοtοcοl
RADIUS, an οpen-standard, UDP-based prοtοcοl οriginally develοped by the IETF
An οbviοus questiοn is “If there’s a TACACS+, what abοut TACACS?” TACACS was the οriginal versiοn οf this prοtοcοl and is rarely used tοday.
Befοre perfοrming AAA Authenticatiοn cοnfiguratiοn, there are sοme οther TACACS+ / RADIUS differences yοu shοuld be aware οf:
While TACACS+ encrypts the entire packet, RADIUS encrypts οnly the passwοrd in the initial client-server packet.
RADIUS actually cοmbines the authenticatiοn and authοrizatiοn prοcesses, making it very difficult tο run οne but nοt the οther.
TACACS+ cοnsiders Authenticatiοn, Authοrizatiοn, and Accοunting tο be separate prοcesses. This allοws anοther methοd οf authenticatiοn tο be used (Kerberοs, fοr example), while still using TACACS+ fοr authοrizatiοn and accοunting.
RADIUS dοes nοt suppοrt the Nοvell Async Services Interface (NASI) prοtοcοl, the NetBIOS Frame Prοtοcοl Cοntrοl prοtοcοl, X.25 Packet Assembler / Disassembler (PAD), οr the AppleTalk Remοte Access Prοtοcοl (ARA οr ARAP). TACACS+ suppοrts all οf these.
RADIUS implementatiοns frοm different vendοrs may nοt wοrk well tοgether, οr at all.
RADIUS can’t cοntrοl the authοrizatiοn level οf users, but TACACS+ can.
We’ll discuss the uses οf bοth οf these prοtοcοls in a future CCNP certificatiοn tutοrial! Lοοk fοr mοre CCNA, CCENT, and CCNP tutοrials right here οn this same website!
Even in this soft hiring market, companies are in need of information technology professionals who are certified in particular aspects of networking. Obtaining a Cisco Certified Network Associate (CCNA) certification provides IT professionals with the working knowledge of network protocols that are most sought after in the technology industry.
With the increasing demand for networking specialists, the value placed on CCNA certification is also increasing worldwide, and it is becoming a benchmark for determining who are the best and the most efficient network technicians. It’s becoming a standard way to filter job applicants as well as candidates for advancement within the technology industry.
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CCNA certification is considered an entry-level certification or minimum requirement for IT professionals specializing in computer networking, and is usually pursued by current technical professionals who are looking for credentials, people who are new to networking, as well as professionals who are updating their training to cover current technology and systems. As an entry-level program, technology employers often consider the CCNA to be a basic qualification requirement for employees who install, configure, operate and problem-solve networks.
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Training Courses
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There are several ways to obtain the CCNA training needed in order to become certified. There are programs that can be attended where the training is hands-on; there are also online training and certification programs that can be worked into the candidate’s schedule more easily. The training program covers installing, configuring, operating and troubleshooting medium-sized route and switched networks as well as implementation and verification of connections to remote sites in a WAN. The training program also includes curriculum related to level 1 security threats and an introduction to wireless networking concepts and terminology.
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The network protocols covered are:
- IP
- Enhanced Interior Gateway Routing Protocol (EIGRP)
- Serial Line Interface Protocol Frame Relay
- Routing Information Protocol Version 2 (RIPv2)
- VLANs
- Ethernet
- Access control lists (ACLs)
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Certification Examination
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In order to become CCNA certified, the training program should be completed and an examination must be passed. The certification examination is structured so that a candidate’s technical and special knowledge of networking environments is thoroughly tested and challenged. The questions require real-world expertise to answer and only those who are well trained and have a thorough knowledge of the ins and outs of computer networks will be able to pass the test and become CCNA certified.
Once the IT professional successfully completes the examination, their CCNA certification is valid for three years before they must re-certify in order to continue using their CCNA credentials. In order to re-certify, there are a number of different exams that may be taken, including one of the following:
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- ICND2 exam
- Current CCNA exam
- CCNA Concentration exam (wireless, security, voice)
- Current CCDA exam
- 642 – XXX professional level or Cisco Specialist exam (excluding Sales Specialist exams)
- Current CCIE
- CCDE written exam
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With the exception of merely taking the current version of the CCNA exam, these many options allow the IT professional to also acquire additional training, knowledge and expertise while pursuing CCNA re-certification.
Cisco CCNA certification exam training means you need to learn a lot of new terms, and some of them can be a little problematic at first view.
To pass this hard certification exam,you definitely need to understand one term which is packet switching. The first question, of course, is “What is packet switching in the first place?” In today’s Cisco CCNA exam prep tutorial we will learn about this term.
Packets transmitted from “point A” to “point B” all have to arrive at the same destination, but with packet switching, they do not all have to take the same path to get there. If you and I are standing 10 feet apart and I want to throw a rugby ball to you, I’ve got some options. I could bounce the ball off the floor to you, I could throw it directly to you, or I could send it up into the air to you. Packet switching is pretty the same thing – packets will take different paths to get from source to destination, but the result is that all the packets arrive at the destination. Then they are then reassembled to take the form of the original message.
Packet switching may sound a little odd, but this is the most efficient way of transporting the data. Frame Relay is a packet switching technology, as is X.25, and both of these standards are very efficient.
When we have packets that must arrive at the destination in the same order in which they left the source, packet switching is not the best choice. For this situation, we’ll need to use something like circuit switching, and we’ll discuss that in tomorrow’s Cisco CCNA certification training article!
Visit our website and sign up for a daily newsletter packed with CCNA, Network+, Security+, A+, and CCNP certification exam practice questions! A free 7-part course, “How To Pass The CCNA”, is also available