1. TC 361 Data Networking Test Review

2. Network Cabling UTP Generally used in Ethernet installations
Cat 3 10 Mbps
Cat Mbps
Cat 5e 1000 Mbps
100M length

3. Network Cabling Coax Has a core made of copper. ThinNet ThickNet
BNC connector
183M
ThickNet
Vampire Taps (MAU)
500M

4. Network Cabling Cont. Fiber Optic Single Mode Multi Mode 2KM Length
Laser
Multi Mode
LED
Multiple Signals
2KM Length
ST, SC connector
Not susceptible to EM interference

5. Network Communication
Packet
Variable Length
Contains Header and Trailer, CRC, and data
Data is divided into packets for ease of transmission
Cell
Fixed Length
MAC address

6. OSI

7. Network Types Ethernet Token Ring
Carrier Sense Multiple Access/Collision Detection (CSMA/CD)
Contention network
Simultaneous transmissions cause collisions
Mbps
802.3
Physcial Media
Coaxial (ThickNet, ThinNet), UTP, STP, Fiber
Token Ring
802.5
4-100 Mbps
Physical Media
Proprietary IBM standard

8. Network Types Cont. FDDI ATM Fiber Distributed Data Interface
Token Passing
Can work in two counter-rotating rings.
Can be used as a backbone network
ATM
Asych Transfer Mode
Data is broken into fixed cells
Ideal for voice/video/data
Transmits 53 byte cells.

9. Network Types Cont. Wireless 802.11b 802.11a 802.11g 11 Mbps 2.4 GHZ
Compatible with b

10. Network Topologies Star Bus Ring Mesh Used in Ethernet.
Computers connected to a central unit.
Bus
Computers are connected in a series
A break in the cable will cause the entire segment to collapse.
Must use terminators
Ring
Passes a token (packet) from one segment to another
Can have the physical topology of a star network.
Mesh
Every computer is connected to one another
Most expensive and reliable technology

11. Network Hardware Hub Switch Used to connect computers together
Repeats packets to all computers on the hub
Token Ring: Multi Station Access Unit
Switch
Used to connect computers together
Repeats packet to the destination system only

12. Network Hardware NIC PCI or ISA
Communicates between physical media and computer
Driver
Works in the MAC sub-layer of the Data Link layer
64-Bit PCI
32-Bit PCI

14. Network Hardware Cont. Bridge Router
Connects two network segments together
Operates at the Data Link layer
Filters data based on network segment
Broadcast messages are still sent to all connected nodes
Router
Connects two network segments together
Operates at the Network Layer
Provides best route for data
Can work with multiple network types
Two major types: Static and Dynamic

15. Network Hardware Cont.
Gateway
Device that sits between LAN and WAN

16. Network Hardware Cont. Wireless Access Point (WAP)
Central Point in a wireless network

17. NOS Windows 2000 NT 4.0 Unix and derivatives Active Directory
Domain Controller
NT 4.0
PDC/BDC
Unix and derivatives
NIS
SAMBA

18. Network Security Outside Threats Internal Threats Encryption VPN
DOS, DDOS
Virus
Intrusion
Internal Threats
Intentional, Unintentional
Encryption
Data
Communication
VPN
Uses Point to Point Tunneling Protocol
Shares
Can be setup as read, write, execute, and delete.

19. Network Health Common Sense Data Redundancy
Computer don’t like water and heat
Data Redundancy
Tape Backup
RAID
Mirroring- copying one partition to another disk.

20. Network Protocols TCP/IP UDP (User Datagram Protocol)
TCP (Transport Control Protocol)
Packet ACK, Error Detection, Flow Control
Adds sequencing numbers to packets so they can be reassembled
IP (Internet Protocol)
32 bit number
Routable/Non Routable
UDP (User Datagram Protocol)
Similar to TCP but no connection is maintained

21. Network Protocols Cont.
NetBEUI
Not a routable protocol
Used primarly in windows systems
IPX/SPX
Internetwork Exchange/Sequenced Packet Exchange