Chapter 6 In Class Notes Flashcards
A collection of computers that communicate with one
another over transmission lines or wirelessly
Computer Network
What are the 3 types of computer networks
1 Local area Network (LAN)
- Wide are network (WAN)
- The internet and internets
Network where computers are connected between two or more separated sites
WAN
Network where Computers are connected at a single physical site
LAN
Networks of networks
internet and internets
is used to facilitate effective
communication between the myriad devices
operating in the communication system that is a
computer network
A “layered protocol”
What Are the Components of a
LAN?
You have one central location with a Switch, an Access Point, and Other components. The computers all connect to the central location and also printers can connect.
• Connects a device’s circuitry to the network’s wires
• Works with programs in each device to implement
protocols for communication
Network Interface Card (NIC or WNIC)
LAN Protocol (Device to Device Comm.) 2 types
• IEEE 802.3 (a.k.a ethernet) – Wired LAN – 10/100/1000 Mbps – Switches detect the speed that a given device can handle and communicates at the same speed • IEEE 802.11 – Wireless LAN – 802.11n (allows speeds up to 600 Mbps) – Bluetooth
Topology of LAN
local area network and local area network with wireless
Transmission line of local area network
UTP or optical fiber and UTP or opitcal for non-wireless connectors
Transmission speed of LAN
10/100/1000 Mbps. Possible 1 Gbps. Up to 600 Mbps for wireless
Functions of the LAN Device? Give 5
• Switch processing: IEEE 802.3 wired LAN traffic
• Access-point processing: IEEE 802.11 wireless LAN
traffic
• Translating between IEEE 802.3 and IEEE 802.11
• Converting between Analog and Digital
• Assigning private IP addresses
• Converting IP address between private and public IP
addresses
• Routing packets
• And more … 10 Copyright © 2013 Pearson Education, Inc. P
When you connect your SOHO, tablet, or mobile
device to the internet, you are connecting to a
WAN
via an internet service provider or ISP
An ISP has three important functions
– Providing you with a legitimate internet address
• Whatismyipaddress.com
– Serving as your gateway to the internet
– Paying for the internet (paying fees, and other charges
on your behalf).
Process of connecting to an ISP. 4 of them
- Personal computer or LAN connnects to Modem.
- From Modem it goes to Switch at telephone or cable company.
- From Telephone or Cable company it goes to the Internet Service Provider.
- From internet service provider you go to Internet.
Connecting to an ISP
• SOHO LANs and individual devices connect to an
ISP in one of the following three ways:
– A digital subscriber line (DSL)
– Cable TV line
– WAN wireless connection (e.g. mobile networks)
converts the
digital data in your computer into an analog signal
that can be transmitted via your ISP to another device
somewhere on the Internet
A modem or modulator/demodulator
converts the
digital data in your computer into an analog signal
that can be transmitted via your ISP to another device
somewhere on the Internet.
A modem, or modulator/demodulator
DSL Modems use the same lines as
voice telephones
DSL signals do not interfere with
telephone service
and occur simultaneously
The protocols used on the internet are arranged
according to a
predefined structure
There are five protocol types arranged in layers
Top layer includes protocols for applications like
browsers and web servers
– Next two layers are protocols for data communications
– Bottom two layers are protocols for intra network data
communication
What are the names of each layer starting from top.
Application Transport Internet Data Link Physical