media and medium
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Media and Medium. Jason Smith August 9, 2014. Transmission Media. Coaxial Cable Twisted Pair Copper Cable Fiber-optic Cable Wireless. Coaxial Cable. Two types ThinNet (10Base2) 10 Mbps, 30 nodes per segment, max 180 meters LAN ThickNet (10Base5) - PowerPoint PPT PresentationTRANSCRIPT
Media and Medium
Jason SmithApril 22, 2023
Transmission Media
• Coaxial Cable• Twisted Pair Copper Cable• Fiber-optic Cable• Wireless
Coaxial Cable
• Two types– ThinNet (10Base2)
• 10 Mbps, 30 nodes per segment, max 180 meters• LAN
– ThickNet (10Base5)• 10 Mbps, 100 nodes per segment, max 500 meters• Backbone
• Insecure– Coax is easy to splice
Twisted Pair Copper Cable
• Copper wire• Twist reduces EMI• Classified by transmission rates
– Cat3, Cat5, Cat5e, Cat6
Fiber-Optic Cable
• Glass core with plastic shielding• Small, light, fragile, and expensive• Very fast transmission rate• Can transmit data very far• Immune to interference• Hard to splice
Wireless
• Microwave, radio and infrared
Security Concerns
• Easy to insert a node or splice into network
• Most attacks involve eavesdropping or sniffing
• Physical security• War driving
Storage Media
• Magnetic Storage• Optical Media• Solid-State Storage Media
Magnetic Storage
• Floppy Disks– 8”, 5.25”– 3.5”
• Double Density – 800KB• High Density – 1.4MB
• Zip Disks– 100MB, 250MB, 750MB
• Other Disks– Jazz, Pocket Zip, Super Disk,
Tape Backup
Magnetic Storage – Hard Drives
• Around $1/GB• Three interfaces
– SCSI• Introduced in early
1980’s• Very fast, reliable,
expensive• Up to 320MB/s• Up to 16 devices
– IDE / ATA• Cheap, common, easy
to setup• Somewhat unreliable
– Serial ATA• Introduced in 2002• 150MB/s• Hot-plugging capability• Serial Attached SCSI
Optical Media - CD
• CD-ROM, CD-R, CD-RW• Typically store 700MB• 1.8GB/$
Optical Media - DVD
• Digital Versatile Disc • Typically store 4 to 17GB• Standards
– DVD, DVD-RAM, DVD-R, DVD-R/W, DVD+R/W
• Non-standards– DVD-VCD, DVD-SVCD,
DVD-MP3
Optical Media - DVD
• Future Standards– DVD+RW DL
• 8.5GB• DVD+RW Alliance• Available now
– DVD HD• 20+GB• Toshiba and NEC• Available in 2005
– Blu-ray• 27GB on single
sided, single layer disc
• blue-violet laser • Panasonic,
Pioneer, Sharp, Samsung, Sony
Solid-State Storage Media
• No moving parts• Slow/fast• Very small• Generally used in cameras, PDAs, etc.• Several types
– CompactFlash (1GB)– Memory Stick (512MB)– Secure Digital (512MB)– Smart Media (128MB)
Security Concerns