Telecommunications, P.II. AIMS 2710 R. Nakatsu. Telecommunications, P. II: An Overview. Network technologies and concepts include: Networking devices Wireless networks Wi-Fi Cellular networks (3G vs. 4G) Last mile broadband Internet/networking protocols Virtual Private Networks (VPNs).
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Network technologies and concepts include:
Refers to the amount of time that it takes a packet to get to its destination. It represents the lag, or delay in communications, between your computer and another (target) computer.
are the hardware devices that unite the various media and computers and route data and communications throughout a network.
1. NETWORK SWITCH– A device containing multiple ports that enable you to connect computers, printers, servers and other devices to a network. A switch serves as a controller, enabling networked devices to talk to each other efficiently within a local network.
2. ROUTER – A networking device that connects two or more networks: it routes packets of data from one network to another.
Question: What is the difference between a router and a switch?
3. REPEATER – a device that gives your network signals a boost.
How do WiFi hot spots work?
The process also works in reverse (can send radio signals to connected devices).
Question: Are there disadvantages of wireless networks?
In a wireless mesh network, a network connection can be spread across dozens or even hundreds of wireless mesh nodes that “talk” to one another.
Each node is an access point with a radio transceiver.
When considering overall network speed remember Amdahl’s Law: a system’s speed is determined by its slowest component.
The bottleneck is the so-called last mile, or the connection that customers use to get online.
Three types of last mile broadband:
A protocol is a standard set of rules and procedures for the control of communications in a network.
Open Systems use common standards for hardware, software, applications, and networking.
Proprietary Systems are closed systems that are owned and controlled by a single company.
Open vs. Closed (Proprietary)
Which is the better strategy?
Some Networking Protocols
Public Network: a network on which your organization competes for time and use with others.
Private Network: a network that your organization either owns or exclusively leases the right to use the communications media.
What are the benefits of public networks?
What are the benefits of private networks?
A secure network that uses the Internet as its main backbone network, but relies on firewalls and other security features.
Example application: A VPN would enable a company to use the Internet to establish secure intranets between its distant branch offices and manufacturing plants.
Popular VPNs include VyprVPN and HotspotVPN
They encrypt all communications you transmit wirelessly and over the Internet.
Some encrypt only web activity while others will also encrypt email exchanges.