Chapter 1 Flashcards
What is telecommunication?
The electronic transmission of signals for communication between a sender and a receiver.
How does communication occur over a client-server model?
The client process (software) on the client’s machine makes a request to a server process (software) on a server machine which replies.
What is the Ethernet standard?
802.3
What is the bluetooth standard?
802.15
What is the wireless standard?
IEEE created a wireless LAN standard dubbed 802.11
What is a computer network?
A collection of autonomous computers interconnected by a single technology
Outline the issue of resource sharing.
Make all programs, equipment, and especially data available to anyone
on the network without regard to the physical location of the resource or the user
How does communication occur over a peer-to-peer model?
Every person can, in principle, communicate with one or more other people; there is no fixed division into clients and servers
What are five uses of networks?
- Access Information
- Ecommerce
- Entertainment
- Person to Person Communication
- Internet of Things
List 4 types of computer networks.
- Mobile and Broadband access networks
- Data Center Networks
- Transit Networks
- Enterprise Networks
What is Metcalfe’s Law?
Bob Metcalfe, the inventor of Ethernet, hypothesized that the value of a network is proportional to the square of the
number of users; thus, Internet popularity comes from its size.
What does GPS stand for?
Global Positioning System
What is NFC?
Near Field Communication allows mobile device to act as an RFID (Radio Frequency Identification) smart-card and interact with a nearby reader for payment
Describe what a CDN is as content provider network
Content Delivery Network is a large collection of servers, geographically distributed so content is close to the users requesting it
Describe the purpose of transit networks.
Traditionally called backbone networks, these networks carry traffic between the content provider and the ISP (Internet Service Provider) with service charges for both parties.
What are some characteristics of a enterprise network?
- Allows resource sharing for devices and information (sometimes uses VPN)
- Allows IP telephony or VoIP (Voice over IP)
- Allows desktop sharing
- Allows electronic business communication
What are two ways to classify networks?
- Transmission Technology
- Scale
What are the two types of transmission technology?
Broadcast links and point-to-point links
Briefly describe point-to-point links.
Point-to-point links connect individual pairs of machines. Packets may have to first visit one or more intermediate machines when going from source machine.
What is unicasting?
A point-to-point transmission with exactly one sender and exactly one receiver .
What is a broadcast network?
Communication channel shared by all the machines on the network; packets sent by any machine are received by all the others unless it contains an address field for an intended recipient. Here the machine processes it and ignores if its not the target.
What is broadcasting in a broadcast network?
When a packet with special code is transmitted, and it is received and processed by every machine on the network.
What is multicasting on a broadcast network?
Transmission to a subset of the machines
What wireless network is standardized as 802.16?
A MAN with wireless Internet access.
What are some variations of WAN?
WAN can be implemented with:
1. Leased lines
2. Internet Connectivity (VPN)
3. ISP network