Chapter 5 -Who’s stealing my signal

Default- Settings

Original “how it comes”

Protection- WEP/WPA2/ , set up password for router

Default settings are built into the settings

802.11, 

reading page 288-289

Chapter 5- Quick Check

Chapter  5 LANS and WLANs

Quick Check-Section A-E

1. To connect to a LAN, a computer requires network circuitry, sometimes referred to as a network Interface card.
2. A peer-to-peer network is simply a small version of a client/server network.  True or False?
3. Communications protocol, such as TCP/IP, set standards for encoding and decoding data, guiding data to its destination, and mitigating the effects of noise.
4. A (n) Packet switching network divides messages into small parcels and handles them n a first-come, first –served basis, whereas a (n) circuit switching network establishes a dedicated connection between two devices.
5. A (n) IP address can be assigned to a network workstation by a DHCP server.
6. A(n) Ethernet LAN is simultaneously broadcasts data packets over all network links and uses CSMA/CD protocol to handle collisions.
7. A HomePNA network uses existing telephone wiring.  True/False?
8. Fast Ethernet operates at 100 Mbps.
9. A network hub is a device that links two or more nodes of a wired network and broadcasts it to all the network nodes.
10. A (n) router can connect the nodes of a LAN and also handle data transfer between a LAN and the Internet.
11. Today’s most popular wireless LAN technology is compatible with Ethernet and called WI-FI.
12. Bluetooth is a short-range wireless network technology used for PANs.
13. In a wireless ad-hoc network, devices broadcast directly to each other rather than through a central broadcasting device.
14. A wireless infrastructure network uses a centralized broadcasting device, such as a wireless access point or router.
15. When setting up a wireless network it is important to change the username and password, create a unique SSID and enable encryption. 
16. Networks offer shared resources, such as printers, software applications, and storage space.
17. For security reasons it is not advisable to allow shared access to the root directory of your C: drive.
18. Before you can send a print job to a shared printer attached to someone else’s workstation, you have to make sure that the printer driver is installed on your computer.
19. A (n) file server is a computer whose primary purpose is to be repository for files that can be accessed by network workstations.
20. A (n) application server can be connected to a LAN to run software for workstations or coordinate game play for a LAN party.
21. The original encryption method used for wireless networks was called WEP, but for the most secure wireless encryption you should use WPA2.   “WEP= Wired Equivalent Privacy, WPA2=WI-FI Protected Access, WPA2= the same kind of strong encryption required by government agencies and businesses.
22. Symmetric key encryption uses the same key to encrypt a message as it does to decrypt the message.
23. Public key encryption uses one key to encrypt a message, but another key to decrypt the message.
24. PGP=Pretty Good Privacy is public key encryption software that is popular with personal computer owners who want to encrypt e-mail and date files.

 

Chapter 5- quick check, and Summary

Interactive Summary-Chapter 5

Section-A

Networks can be classified by geographical scope as PANs, LANs, MANs, NANs, and WANs.  LAN technologies are standardized by the IEEE organization.   Each concept point on a network is referred to as a node and can contain computers, networked peripherals, or network devices.  Computers connected to a network require network circuitry, often housed on a network interface card (NIC).  Networks that include one or more servers can operate in client/server mode or peer-to-peer mode.

Networks without a server typically operate in peer-to-peer mode.  Physical network topologies include star, bus, ring, mesh, and tree.  Network nodes are linked by communications channels.  High bandwidth channels are referred to as broadband, whereas low bandwidth channels are referred to as narrowband.  Communications protocols, such as TCP/IP, divide messages into packets, handle addressing, and manage routing.

Section-B

Wired networks are fast, secure, and simple to configure.  HomePNA networks transport data over telephone wiring and HomePlug networks transport data over electrical wiring.  Ethernet networks use CAT5 or CAT6 wiring with plastic RJ45 connectors.

Ethernet uses CSMA/CD protocol to detect collisions.  Fast Ethernet operates at 100 Mbps, whereas Gigabit Ethernet operates at 1000 Mbps.  Ethernet is usually wired in a star topology to a central device.  A network hub is a device that accepts data from one workstation and broadcasts it to all of the other

network nodes.

A network switch is a more sophisticated connection device that sends data only to the devices  specified as the destination.  A network router is a network device that can ship data from one network to another.  You typically use your browser software to access the router’s configuration utilities.

Section-C

Most wireless LANs transport data using radio frequency signals.  The most popular WLAN technology is Wi-Fi, but Bluetooth is used for PANs, and other short-range connections.  Wi-Fi is defined by the IEEE 802.11 standards, and there are versions denoted by the letters a, b, g, and n.  Computers on a Wi-Fi network must have wireless circuitry , such as a Wi-Fi adapter.  Wireless networks can be set up as a wireless ad-hoc network in which devices broadcast directly to each other, or as a wireless infrastructure network that uses a centralized broadcasting device, such as a wireless access point or a wireless router.  When setting up a wireless network it is important to change the default router password, create an SSID to uniquely identify the network, and enable wireless encryption for security.

Class Notes-Chpt-5 11-16-09

Class Notes

Topology-

Setting up a Network-

Enough understanding to set up a network-how it should go.

page 251-

bus, is referred to as a pipe

Bandwidth=network links must move data and move it quickly.

Bandwidth, refers to, how big the pipe is,

the transmission capacity of a communications channel.

Chapter 5-

Page 251

Bandwidth=network links must move data and move it quickly.

is the transmission capacity of a communications channel.

How much bandwidth do you have? How much do you need.

1mbps, 5mbps, 10 mbps, 20 mbps,

= mega bites per second.

highway, traffic, bigger the highway, as broadband connections get wider, more information is sent.

Packet switching,  and, circuit switching, will be on the test.

circuit switching, a————to ————–b, limited number of circuits, this is for a————-and————b.

you have to open a line, between 2 points, when all of them are used up, the line is busy.  (telephone)

partyline,=sharing a circuit with other people.

Packet switching= how is it different from circuit switching.

page 253,

Know this page.

IP address=anything connected to the internet, has to have an IP address.

it’s own unique identity.

Ethernet:  generic term for, they way in which devices connect to one another.

protocol, set of rules.

protocol for ethernet IEEE 802.3

Ethernet functions by sending out information, and waits for somebody to say it belongs to them.

Ethernet is not owned by anyone.

Non proprietory

261

The connector on a Ethernet port is called, RJ-45

RJ11

RJ 12

11 and 12, has 4 pins,

CAT 5- general use

CAT 6- longer distances, outdoors,

Assignment, due next Monday.

New Computer Store, called Micro center, in Brentwood.

Basics of the Wireless.

page 268

g replaced b, because it was faster.

the slowest link dictates, but, the card in the computer or the laptop, has to be just as fast.

backward compatitble

all these pieces have to interact, the slower ones dictate,

Chapter 5 LANs & WANS

Chapter 5

Study the terms and study from the test bank.

Test will be multiple choice.

This is a long chapter, and the most technical.

Everything is “Networked Now”,

Linda is discussing solid state drives

They are expensive.

3 Types of storage,

Optical, magnetic, Solid state

Optical=cd drive

Magnetic=

The optical and magnetic will be replaced by solid state storage.

Glorified thumb drives.

Terms on page 293, that I have highlighted will be on the test.

Network Device:

anything that can be connected to your computer.

Network interface card: also called a NIC

wired type or of a wireless type.

Server -Client :  You have a server and all the other computers are connected to it.

Server is giving and the clients are receiving.

page 249

Peer-2-Peer

most common is , windows and file sharing

with peer-2-peer

no server involved.

Test

Star Topology:  features a central connection

know the advantages and disadvantages.

each computer is linking itself to the central point/

most common, several computers connected to a router, and the reason for calling it a star, , topology is a fancy word for layout.

physical layout

RING: ole IMB, big failures in network, didn’t stick around long

The reason it existed was, trying to solve the problem of sending out information, this was before the Internet existed.

too many liabilities.

Backbone:  know this terminology/

Communication Channel,

bacbone and communication channel, together, gets you to the Tree Topology

To connect various networks.

           0

_-0—–0—-   router connects

    

Peer-2-Peer

Forest Park, LAN and also a picture of te Global Network.

Tree topology is what it’s all about.

Bus: simply means a pathway for data.

A pathway for data.

Read chapter 5

study terms, come with questions.

 

November 8th, 2009

Chapter 5 next week

Do a mail merge today?

I’ve been sick, I have not studied, but, I think I can get through this assignment.

Ughhhhhhhhhhhh

Mail merge,  “help”

Chapter 5 – Terms

Network:  a group of connected computers.

Local Area network (LAN):  A network in which the computers are nearby one another, such as in the same building.

Wide Area Network (WAN): A network in which the computers are physically separated, such as in different buildings or cities.

Client/Server:  A type of network in which one or more servers admisters the network, providing services to the client PC’s

Client:  An end-user PC in a network.

Server:  A computer dedicated to administering the network.

Peer-2-Peer (P2P): A network consisting only of clients PCs

Wi-Fi:  The popular name for the 802.11 wireless RF standard, encompassing variants including 802.11a, 802.11b and, 802.11g

RJ-45 Connector:  A plug, like a telephone plug but slightly wider, used to connect a PC to a network.

Network interface card (NIC):  A circuit board, or a built-in component on a motherboard, that provides network connectivity for a PC.

Switch:  A box into which PCs connect that directs network traffic among the PCs.

Router:  A type of swtich that is able to direct traffic between different segments of a network.

Wireless access point:  A switch for wireless networking.

SSID:  The identifier for the wireless access point or router.

Virtual Private Network:  (VPN)  A secure software tunnel that runs from one computer to another using the Internet as ts conduit.

Internet Protocol address (IP):  A numeric address that uniquely describes the address of a PC or other network-aware component on a network or on the Internet.

Subnet:  A group of computers that share a common top-level identifier, similar to the telephone numbers in a certain area code.

Subnet mask:  A numeric code that indicates what part of the IP address represents the subnet and what part represents the individual address of the PC.

Default gateway:  The IP address of the port that leads out of your local subnet and into the larger network or the Internet.

Modem:  Short for modulator/demodulator, a device that coverts between digital computer data and analog, soundwave data and can be transmitted via telephone lines.

Terminal adapter:  A communication device that sends and receives all-digital networking data, such as for cable or DSL Internet connection.

……………. to be continued.