Cbk #2: Telecommunications And Network Security

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APPLICATION- PROVIDES PROTOCOLS TO SUPPORT APPLICATIONS

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PRESENTATION-PUTS DATA IN A FORMAT THAT THE END SYSTEM CAN UNDERSTAND

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SESSION- HOST TO HOST COMMUNICATION, SECURITY

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TRANSPORT-END TO END TRANSPORT, FLOW CONTROL AND INTEGRITY

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NETWORK-PATH DETERMINATION AND LOGICAL ADDRESSING (IP ADDRESSING) ROUTERS

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DATA LINK-PHYSICAL ADDRESSING (MAC ADDRESS) HUBS

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PHYSICAL-MEDIA, CONVERTS BITS INTO VOLTAGE FOR TRANSMISSION

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WELL KNOWN PORTS

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PORTS ARE THOSE FROM 0 THROUGH 1023

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HIGH NUMBERED PORTS

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PORTS ARE THOSE FROM 1024 THO=ROUGH 65535

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FILE TRANSFER PROTOCOL (FTP)

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PORTS 20 AND 21

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SECURE SHELL (SSH)

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PORT 22 SECURE DATA CONNECTION

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TELNET

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PORT 23

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SIMPLE MAIL TRANSFER PROTOCOL (SMPT)

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PORT 25

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DOMAIN NAME SERVICE (DNS)

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PORT 53

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TRIVIAL FILE TRANSFER PROTOCOL (TFTP)

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PORT 69

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HYPER TEXT TRANSFER PROTOCOL (HTTP)

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PORT 80

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POST OFFICE PROTOCOL (POP)

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PORT 11O

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SIMPLE NETWORK MANAGEMENT PROTOCOL (SNMP)

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PORTS 161 &162

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SECURE HYPER TEXT PROTOCOL (HTTPS)

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PORT 443

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ADDRESS RESOLUTION PROTOCOL (ARP)

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CONVERT IP TO MAC ADDRESS

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REVERSE ADDRESS RESOLUTION PROTOCOL (RARP)

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CONVERT MAC TO IP ADDRESS

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NETWORK ADDRESS TRANSLATION (NAT)

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ALLOWS SINGLE IP TO BE USED BY MANY HOSTS

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PORT ADDRESS TRANSLATION (PAT)

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ALLOWS SINGLE IP TO BE USED BY MANY HOSTS

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COAXIAL CABLE

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COPPER CORE SURROUNDED BY SHIELDING LAYER AND GROUNDING WIRE

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TWISTED-PAIR

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INSULATED, TWISTED COPPER WIRES SURROUNDED BY PROTECTIVE JACKET

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FIBER-OPTIC

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GLASS USING LIGHT PULSES FOR DATA TRANSMISSION, RESISTANT TO EMI

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WIRELESS NETWORKS

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COMPUTER NETWORK IMPLEMENTED WITHOUT WIRES

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CARRIER SENSE MULTIPLE ACCESS (CSMA)

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POROCOL THAT VERIFIES ABSENCE OF TRAFFIC BEFORE TRANSMISSION

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CARRIER SENSE MULTIPLE ACCESS WITH COLLISION AVOIDANCE (CSMA/CA)

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SIGNALS AND WAITS FOR "ALL CLEAR" TO AVOID COLLISIONS

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CARRIER SENSE MULTIPLE ACCESS WITH COLLISION DETECTION(CSMA/CD)

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ABORTS TRANSMISSIONS AND NOTIFIES OTHER STATIONS IF COLLISION IS DETECTED

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POLLING

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MASTER QUERIES NODES TO CONTROL NETWORK TRANSMISSIONS

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LOCAL AREA NETWORKS

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CONNECTS NETWORK DEVICES OVER A RELATIVELY SHORT DISTANCE

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METROPOLITAN AREA NETWORKS

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CONNECTS NETWORK DEVICES OVER A SHORT GEOGRAPHICAL DISTANCE

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WIDE ARE NETWORKS

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CONNECTS NETWORK DEVICES OVER A LARGE GEOGRAPHICAL DISTANCE

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INTERNET

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WORLD WIDE WEB

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INTRANET

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PRIVATE, INTERNAL NETWORK

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EXTRANETS

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PRIVATE NETWORK THAT EXTENDS BEYOND THE INTRANET BOUNDARY

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BROADCAST

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TRANSMISSION TO ALL NODES ON THE NETWORK

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UNICAST

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TRANSMISSION TO ONE PARTICULAR NODE

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MULTICAST

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TRANSMISSION TO MULTIPLE NODES

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BUS TOPOLOGY

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NODES ARE CONNECTED VIA A SINGLE COMMUNICATIONS LINE

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RING TOPOLOGY

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NODES ARE CONNECTED VIA A COMMUNICATIONS LOOP

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STAR TOPOLOGY

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NODES ARE CONNECTED VIA CONNECTION TO A CENTRAL NODE

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TREE TOPOLOGY

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NODES ARE CONNECTED VIA A MULTIPLE COMMUNICATION BRANCHES

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MESH TOPOLOGY

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NODES ARE CONNECTED TO EACH OTHER

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DEDICATED LINES

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CONNECTS TWO SPECIFIC ENDPOINTS

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NONDEDICATED LINES

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CONNECTS TO REMOTE SYSTEMS AS NEEDED

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X.25 NETWORKS

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USED FOR PACKET SWITCHING IN WANS

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FRAME RELAY

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USES PACKET SWITCHING ALLOWING ORGANIZATIONS TO SHARE WAN CONNECTIONS

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ATM NETWORKS

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HIGH SPEED CELL BASED SWITCHING

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RAID 0

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DATA STRIPING OVER SEVERAL DRIVES; NO REDUNDANCY

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RAID 1

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MIRRORING ON TWO OR MORE DISKS

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RAID 5

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INTER LEAVE PARITY ON 3 OR MORE DISKS

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RAID 10

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STRIPING AND MIRRORING ACROSS SEVERAL DRIVES

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FIREWALLS

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PERMIT/DENY APPLICATIONS BASED ON ACCESS CONTROL LIST

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PACKET FILTERING

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INSPECTS AND ACCEPTS/REJECTS PACKETS PASSING THROUGH THE NETWORK

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APPLICATION-LEVEL FIREWALL(PROXY SERVER)

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PERMITS/DENIES ACCESS TO SPECIFIC APPLICATION OF SERVICES

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STATEFUL INSPECTION FIREWALL

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A FIREWALL THAT KEEPS TRACK OF THE STATE OF NETWORK CONNECTIONS

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DYNAMICS PACKET FILTERING FIREWALLS

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CONCEPTS OF A NORMAL PACKET FILTER BUT WITH INCREASED INTELLIGENCE

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VIRTUAL PRIVATE NETWORK

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SECURE PRIVATE CONNECTION THROUGH A PUBLIC NETWORK

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POINT TO POINT TUNNELING PROTOCOL (PPTP)

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TUNNELING PROTOCOL; P2P COMMUNICATION MUTUAL AUTHENTICATION; FOR IP NETWORKS

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LAYER TWO TUNNELING PROTOCOL (L2TP)

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TUNNELING PROTOCOL; P2P COMMUNICATION; WORKS OVER MULTIPLE NETWORKS

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IPsec

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TUNNELING PROTOCOL; SECURE AUTHENTICATION &ENCRYPTION; LAN TO LAN COMMUNICATION FOR IP NETWORKS