Category: CCNA

Cisco Certified Network Associate certification resources

ATM
CCNA February 24, 2020

What is ATM?

ATM is the abbreviation of Asynchronous Transfer Mode. It is using time-division multiplexing (TDM) for data communications. It is capable of transferring voice, video, and data through private and public networks. ATM is working on a cell-based architecture in place of frame-based architecture. The size of the Asynchronous Transfer Mode cell is fixed to 53...
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frame relay
CCNA February 23, 2020

What is Frame Relay? Exclusive Introduction

Frame relay is a packet-switching telecommunication service designed for interconnecting enterprise LANs. Being a student of networking, it is important that you know about all the emerging WAN technologies. To stay up-to-date with emerging and developing technologies, you may know the following alternate options available for WAN connectivity. Frame Relay Broadband DSL Broadband cable modem...
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ISDN
CCNA February 22, 2020

ISDN

ISDN stands for Integrated Services Digital Network. It is a circuit-switched technology using the local loop of a PSTN to carry digital signals. It can transmit both data and voice over a digital line. It is a set of communication standards, which can transmit data, voice, and signalling. ISDN connections provide better speeds and higher...
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CCNA February 22, 2020

Dialup

Dialup is a WAN connection technique established using a modem and Active PSTN line. The modem dials a number attached to another computer at the destination end and establishes a connection capable of transferring data. The modem and telephone lines work as a data transfer medium. Usually, a dial-up connection is used as a connectivity...
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CCNA February 22, 2020

Leased Lines

Leased Lines are dedicated communication channels between two or more nodes. Usually, it is a pre-established WAN connection from the customer premises to the service provider network. The lines are usually leased from a service provider; they are called leased lines.  The leased lines work as a dedicated tunnel from one point to another. It...
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SDH and PDH
CCNA February 22, 2020

What is PDH?

PDH is the abbreviation of plesiochronous digital hierarchy. The term plesiochronous derives from two Greek words: ‘plesio’ means ‘near’ and ‘chronos’ means ‘time’. In the plesiochronous digital hierarchy, the clocks are running close but not exactly matched, so signal arrival times may be different when multiplexing, as the transmission rates are directly linked to the...
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SDH and PDH
CCNA February 17, 2020

What is SDH?

SDH is the abbreviation of Synchronous Digital Hierarchy, which refers to multiplexing techniques and technology used in networking and telecommunications. It is the most popular standard being used in the whole world. The SDH proved a high-speed transfer of data and digital signals. Due to synchronization, Synchronous Digital Hierarchy provides a flexible and simple network...
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CCNA February 13, 2020

What is SONET?

SONET stands for Synchronous Optical Networking. It is a protocol for transmitting a huge volume of data over long distances using a fiber optic medium. Synchronous Optical Networking was primarily developed in 1984 and then standardized by the American National Standards Institute (ANSI) in 1988. Using synchronous optical networking, multiple digital data streams are transferred...
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A laptop connected to multiple network cables on a world map background, next to text ‘Switching It Up: Circuit vs Packet’
CCNA February 12, 2020

Circuit Switched vs Packet Switched

WAN devices discussed in the previous article are incomplete because other devices may be needed, depending on the chosen WAN access technology. WAN access technologies are either circuit-switched or packet-switched. Circuit Switched In a circuit-switched network, communications between end devices must be established before they can communicate. A circuit-switched network establishes a dedicated circuit (or...
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WAN Devices
CCNA February 8, 2020

WAN Devices

There are many types of specially designed WAN devices used in networks. These devices require expert skills for configuring and management. The important WAN devices are: Dialup modem Dialup Modems allow digital data to be sent over an analogue medium during the transmission and receiving of information. The dial-up modem is a legacy WAN technology....
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