Loading ...10 Things You Should Know About the Cisco CCNA Voice Certification
By admin | April 13, 2009
1. What are the industry trends that motivated Cisco to create the CCNA Voice concentration?
Today, organizations of all types are moving toward a single, IP-based network that carries data, voice, and video traffic. But VoIP and related applications have characteristics and issues that are distinctly different from those of data traffic. Understanding voice networking requires specialized knowledge and skills, a fact that many employers now recognize.
Another important consideration is to meet the transition needs of organizations that currently operate traditional telecom environments. The move from analog TDM to digital VoIP technology systems continues to drive infrastructure improvements for organizations of all sizes and industries. Up to 80 percent of global companies are evaluating IP telephony solutions. These companies are seeking the productivity, cost, and end-user feature benefits that come with using the network as the platform for VoIP.
2. What do employers say about their needs for people with this type of knowledge and skill? Read the rest of this entry »
Topics: 640-460 Exam, CCNA, CCNA Voice | 1 Comment »
CCNP BCMSN(642-812) Lab – AAA dot1x(New)
By admin | April 11, 2009
Acme is a small shipping company that has an existing enterprise network comprised of 2 switches;DSW1 and ASW2. The topology diagram indicates their layer 2 mapping. VLAN 40 is a new VLAN that will be used to provide the shipping personnel access to the server. For security reasons, it is necessary to restrict access to VLAN 20 in the following manner:
– Users connecting to ASW1’s port must be authenticate before they are given access to the network. Authentication is to be done via a Radius server:
– Radius server host: 172.120.39.46
– Radius key: rad123
– Authentication should be implemented as close to the host device possible.
– Devices on VLAN 20 are restricted to in the address range of 172.120.40.0/24. Read the rest of this entry »
Topics: 642-812 Exam, CCNP | 53 Comments »
Internetworking/Networks
By admin | April 11, 2009
A network is defined as a group of two or more computers linked together for the purpose of communicating and sharing information and other resources, such as printers and applications. Most networks are constructed around a cable connection that links the computers, however, modern wireless networks that use radio wave or infrared connections are also becoming quite prevalent. These connections permit the computers to communicate via the wires in the cable, radio wave or infrared signal. For a network to function it must provide connections, communications, and services.
. Connections are defined by the hardware or physical components that are required to connect a computer to the network. This includes the network medium, which refers to the hardware that physically connects one computer to another, i.e., the network cable or a wireless connection; and the network interface, which refers to the hardware that attaches a computer to the network medium and is usually a network interface card (NIC). Read the rest of this entry »
Topics: CCNA, CCNA Articles, CCNA R&S | No Comments »
The TCP/IP Model
By admin | April 11, 2009
TCP/IP and the OSI Reference Model
As illustrated in Figure 1.2, the TCP/IP model consists of four layers, each of which can have several sublayers. These layers correlate roughly to layers in the OSI reference model and define similar functions. Some of the TCP/IP layers correspond directly with layers in the OSI reference model while other span several OSI layers. The four TCP/IP layers are:
. The TCP/IP Application Layer refers to communications services to applications and is the interface between the network and the application. It is also responsible for presentation and controlling communication sessions. It spans the Application Layer, Presentation Layer and Session Layer of the OSI reference model. Examples include: HTTP, POP3, and SNMP. Read the rest of this entry »
Topics: CCNA, CCNA Articles, CCNA R&S | No Comments »
The 7 Layer OSI Model
By admin | April 11, 2009
The OSI Reference Model
The OSI is the Open System Interconnection reference model for communications. As illustrated in Figure 1.1, the OSI reference model consists of seven layers, each of which can have several sublayers. The upper layers of the OSI reference model define functions focused on the application, while the lower three layers define functions focused on end-to-end delivery of the data.
. The Application Layer (Layer 7) refers to communications services to applications and is the interface between the network and the application. Examples include: Telnet, HTTP, FTP, Internet browsers, NFS, SMTP gateways, SNMP, X.400 mail, and FTAM.
. The Presentation Layer (Layer 6) defining data formats, such as ASCII text, EBCDIC text, binary, BCD, and JPEG. Encryption also is defined as a presentation layer service. Examples include: JPEG, ASCII, EBCDIC, TIFF, GIF, PICT, encryption, MPEG, and MIDI. Read the rest of this entry »
Topics: CCNA, CCNA Articles, CCNA R&S | 1 Comment »
IP subnetting
By admin | April 10, 2009
IP subnetting is a fundamental subject that’s critical for any IP network engineer to understand, yet students have traditionally had a difficult time grasping it. Over the years, I’ve watched students needlessly struggle through school and in practice when dealing with subnetting because it was never explained to them in an easy-to-understand way. I’ve helped countless individuals learn what subnetting is all about using my own graphical approach and calculator shortcuts, and I’ve put all that experience into this article.
IP addresses and subnets
Although IP stands for Internet Protocol, it’s a communications protocol used from the smallest private network to the massive global Internet. An IP address is a unique identifier given to a single device on an IP network. The IP address consists of a 32-bit number that ranges from 0 to Read the rest of this entry »
Topics: CCENT, CCENT Articles | No Comments »
Pass4sure Coupon Promotion Code
By admin | April 10, 2009
From 2009, Pass4sure will reform the promotion code system, which means most of the old coupons would be cancelled. And new discount codes will be released occasionally. CiscoBible would like to express appreciation for those who are supporting this site for long time, and will provide some special offer for all registered ciscobible.net members: 10% – 20% discount for all products for all of you!
As most of the new promo codes would be one-off , which is not disposable, you’d better pay attention to posts on this site, or simply subscribe. I would try my best to get the latest coupons and update frequently!
Please keep this promotion code for the discount, it’s special for all of ciscobible.net members. you can click here to register.
Purchasing steps:
1.Login http://www.pass4sure.com (VIP Discount Channel)
Topics: Pass4sure Hotspot | 7 Comments »
10 Steps To A Quality Cisco Certification
By admin | April 9, 2009
With the rapid growth and expansion in the field of network technology there is increasing demand for skilled network professionals. Cisco Systems has long been the industry leader in the field of data networking and continues to grow market share in all major technology areas, including those areas of current high demand such as voice, video, and wireless. Gaining experience with and certifications in Cisco technologies can provide a safe harbor for your career in uncertain economic times such as these. While many technology professionals are interested in Cisco certifications there is often confusion as to the best path to take and how to achieve a quality certification experience.
Achieving that quality certification experience is the key. Many of us have been in the industry long enough to hear the term “paper certifications” which refers to a certification gained by an individual with little resulting practical experience and knowledge; the certification is Read the rest of this entry »
Topics: Cisco Cert Introduction | 2 Comments »
Converting IPv4 to IPv6 and back
By admin | April 9, 2009
Converting from IPv4 to IPv6
Is so easy, yet everyone seem to convert a IPv4 address to binary, then to IPv6. Why? Why waste time and do things the long way? Not cool.
Firstly before starting I will assume everyone knows the following:
- Binary is a Base-2 numbering system, as it has only 0,1
- Decimal is a Base-10 numbering system, as it has 0,1,2,3,4,5,6,7,8,9
- Hexadecimal is a Base-16 numbering system, as it has 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
I also assume you know the hex values in decimal:
Topics: CCNA, CCNA Articles, CCNA R&S | 4 Comments »