Data Communication Reviewer

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Reviewer DataCom: Chapter 1-5

Chapter 1:

Intranet- Restricted group on a company and only allows internal employee access. Extranet- Type of network that allows outside vendors special access to limited info in a company. Protocols- Rules of communication.

* An identified sender and receiver
* An agreed-upon method of communicating
* Common language and grammar
* Confirmation or acknowledgement requirements
Elements of a Network:
* Rules or agreements: protocols or how the message is semt, directed, received and interpreted. * Massages: units of info that travels
* Medium: means of interconnecting these devices, can transport the messages * Devices: devices on the network exchange messages
Messages- a generic term that encompasses forms of communication enabled by the Internet. Devices- several devices work to see that the message is properly directed to the source to the destination device. Icons- symbols that graphically presents network devices and media. * Desktop Computer

* Laptop
* Server – a computer dedicated to providing app services * IP Phone – a digital phone
* LAN media
* Wireless media
* LAN switch – most common device for interconnect LANs * Firewall – provides security to networks
* Router – helps direct messages between networks
* Wireless router
* Cloud – summarize a group of networking devices
* WAN media
IP (Internet Protocal) & TCP (Transmission Control Protocol) – most common protocols * WWW – HTTP
* E-mail – SMTP
* Instant messae – XMPP
* IP telephony – SIP
Convergence – coming together of technologies onto a digital platform. It occurs when computer communications all use the same rules to transport their messages. Network Architecture – the conceptual plans on which a physical network is built. * Fault tolerance- needs to function even if some components fail * Scalability- network’s ability to grow & react to future changes * Quality of service- performance level of services. Prioritize traffic and its characteristics to manage data. * and Security

Packets-single message is broken into small blocks of data.
Bandwidth- measure of the data-carrying capacity of the network.

Chapter 2:

Elements of communication:
* Message source, or sender
* Destination, or receiver
* Channel- media that provides pathway
Network- refers to data networks carrying massages.
Segmentation- all messages are broken into smaller pieces
* Multiplexing- occurs when segments of two messages can shuffle into each other and share the medium. * Increased efficiency of network communication
End device- a piece of equipment that is either the source or the destination of a message on a network. Host- an end device that sends or receives messages.
Clients- other hosts that set up to store and share info by the host servers *The host address is a unique physical address used by hosts inside a LAN. Intermediary device- connects the individual host to the network and connect multiple individual network to form an internetwork. * Network access devices

* Internetwork devices
* Communication severs
* Modems
* Security devices
Network media: Copper, Fiber-optic cable, Wireless
Encoding- refers to the way data is converted to patterns of electrical, light, or electromagnetic energy. LAN- a group of end devices and users under the control of a common administrator. WAN- a network that is used to connect LANs that are geographically far apart. Internetwork- is a collection of two or more LANs connected by WANs. Proprietary – A limited-use protocol owned by a company.

Network Representations:
* Network interface card (NIC)- provides the physical connection to the network at the PC or other host device. * Physical port- is a connector or outlet on a networking device where the media is connected to a host. * Interface- refers to how the device can allow 2 different networks...
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