Archive for the ‘Network+’ category

What is OSPF?

November 1st, 2009

Open Shortest Path First (OSPF) is a routing protocol that is used in large networks. Internet Engineering Task Force (IETF) designates OSPF as one of the Interior Gateway Protocols. A host uses OSPF to obtain a change in the routing table and to immediately multicast updated information to all the other hosts in the network.

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Posted in CCENT, CCNA, CIW Associate, CIW Associate Design Specialist, CIW Certified Security Analyst, CIW Professional, Master CIW Administrator, Master CIW Designer, Master CIW Enterprise Developer, Master CIW Web Site Manager, Network+

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What are OSI and DoD models of network communications?

October 31st, 2009

The OSI Model

The International Organization for Standardization (ISO) developed the Open Systems Interconnection (OSI) reference model in 1977. The OSI model is a conceptual framework that can be used to get a better understanding of the complex interactions taking place among the various devices in a network. The purpose of the OSI model is to demonstrate how the network entities should work together for communication.

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What is 802.11g?

October 28th, 2009

The 802.11g standard, defined by IEEE, is an extension to the 802.11b standard of wireless network. It operates in 2.4-GHz band and brings data rates up to 54Mbps using Orthogonal Frequency-Division Multiplexing (OFDM) technology. Since the 802.11g standard is backward compatible with 802.11b, an 802.11b device can interface directly with an 802.11g access point.

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What is EIRP?

August 30th, 2009

Effective Isotopic Radiated Power (EIRP) is the power of the signal transmitted from the antenna of an access point (AP). EIRP is calculated as follows:

EIRP = The radio’s power output + Increase in power caused by the antenna – Power lost in the cabling

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What is IEEE 802.11b?

August 28th, 2009

The IEEE 802.11b standard applies to wireless LAN networks that use radio waves as the transmission medium. These networks each have a separate media access control mechanism, known as Carrier Sense Multiple Access with Collision Avoidance (CSMS/CA), that works like the CSMA/CD mechanism used by the Ethernet. The difference is that in this protocol, when a computer sends its signals, the receiving computer performs a cyclical redundancy check and sends an acknowledgement message to the sending computer if no error is detected.

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Tags: 220-601 220-604 220-702 N10-003

Routing Protocols

August 22nd, 2009

A routing protocol specifies how routers communicate with each other for distributing routing information between routers on a network. It helps each router determine the best path to deliver packets by knowing about all other routers connected to the network.

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How to perform a physical installation of a router?

July 11th, 2009

To perform a physical installation of a router, take the following steps:

Connect LAN cables to the LAN ports.

If using an external CSU/DSU, connect the router’s serial interface to the CSU/DSU and the CSU/DSU to the line from the WAN service provider. And if using an internal CSU/DSU, connect the router’s serial interface to the line from the WAN service provider.

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What is Voice over IP?

July 10th, 2009

Voice over IP (VoIP) is a TCP/IP application that passes voice traffic over the data network inside IP packets by using application protocols. A single VoIP call takes less than 30kbps of bandwidth over a WAN. VoIP requires low delay and very low jitter to produce good quality VoIP traffic. It does not require resending lost packets, as it would be useless by the time it was recovered.

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IEEE standards for Wireless LAN (WLAN)?

July 10th, 2009

IEEE

Institute of Electrical and Electronic Engineers (IEEE) is a society of technical professionals. It promotes the development and application of electro-technology and allied sciences. IEEE develops communications and network standards, among other activities. The organization publishes a number of journals, have many local chapters, and societies in specialized areas.

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What is 100BaseTX?

July 9th, 2009

The 100BaseTX networks are known as fast Ethernet. These are the most widely used networks now-a-days. 100BaseTX Ethernet uses two of the four wire-pairs in the category 5 UTP cable. The number 100 used in the name indicates that these networks run at the speed of 100 Mbps using category 5 UTP cable. The topology used in these networks is star. The maximum cable segment length of 100BaseTX is 100 meters. The following table lists the 100BaseTX specifications:

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