networking, part two two. fiber optic ethernet uses light to transmit data therefore immune to noise...
TRANSCRIPT
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Networking, Part Two Two
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Fiber Optic Ethernet
• Uses light to transmit data therefore immune to noise and grounding issues
• Up to 2000 meters cable length• Used for “backbone” runs• Half-duplex, so need two cables• Tends to be delicate, expensive and difficult to
use – shows up in data centers and seldom on desktops
• What is Verizon doing with Fios?
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Fiber Terminations
Round ST
Square SC
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Fiber Modes
• LED-based light source uses Multimode cable – multiple light signals at the same time each using a different reflection angle
• Good for short distances• Laser light-based use single-mode; high
transfer rates over long distances but rare• Most fiber cable is multimode; delicate and
expensive
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Coax/BNC
• Old form of networking – did not require hub/switch; still used in cable modems, TV and satellite connections
• Type F connectors used in cable modems, etc. screw together
• BNC connectors are quarter-turn• Can be RG-6 or RG-59 (thinner); 75-ohm
impedance
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Typical connection
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Hubs
• Input on one port (does not matter which port)
• Signal is amplified and sent out on all ports• Easy way for long cable runs run-hub-run• Initially very expensive, have gotten cheaper
over time and are now seldom used
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Switches
• Successor to hub• Automatically creates point-to-point
connection between any two ports• Again, price has come way down
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Bridges
• Started out as hubs that could connect different media (coax and UTP)
• Developed into switches• Now have intelligence that can do simple
routing
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NAS
• Network Attached Storage• Just shares files (hard disk storage)• Can be headless – no keyboard, video or
mouse• Use some form of Web interface to configure• Also called Network Appliance
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Routers
• Must have at least two connections – one into a network and one out to another network
• Hello, CISCO; when you go beyond the home
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Structured Cabling
• The idea is to create a safe, reliable cabling infrastructure for all of the devices that need interconnection
• Start with switches, cabling and PCs• Components of a network, such as how the
cable runs through the walls and where it ends up
• Connections leading outside your network• Standards from TIA/EIA
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Structured Components
• Telcom room – place where all wires lead to• Horizontal cabling – from telcom room to PCs• Work areas – where the PCs are
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Horizontal Cabling
• Use solid core wire – better conductor but stiff• Away from the dreaded vacuum cleaners!
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Telco Room
• Equipment racks – from railroad days – 19” wide
• Tall: 1.75” – called a U• Devices are 1U, 2U or 4U – mostly• Patch Panels allow wiring punchdown on back
side and patch cables on the front side• Patch panels have CAT rating, so check it out
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RJ-45 Jack Crimping
• Take Network+ , or follow the book’s figures• EZ-RJ-45 jacks may be more expensive, but
they are worth every penny
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Work Area
• Wall plate to terminate horizontal run• Plates have CAT ratings too• Mike suggests looking here first if the user has
lost connection to the network
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TCP/IP review
• Dotted decimal notation• Subnet mask to identify network number and
node number• Class A: 1-126• Class B: 128-191• Class C: 192-223• TCP is connection-oriented; UDP is
connectionless (User Datagram Protocol)
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TCP/IP Services
• HTTP – HyperText Transfer Protocol• Telnet – Allows remote access to a device• Ping – Can one host reach another?• Tracert – How to get from one point to
another• Most services are command-line based
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DHCP
• Dynamic Host Configuration Protocol• Will assign IP address, DNS server(s) and other
configuration data• Your home router does this function
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Automatic Private Addressing
• Automatic Private IP Addressing (APIPA)• When you can’t see (reach) a DHCP server• 169.254.X.X - X and X are random numbers
less than 255• Will broadcast the address to see if anyone
else is using it• Can only talk to other 169.254’s
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IPv6
• Not just a superset of IPv4; uses 128 bits• Always has eight groups of four hexadecimal
characters• Leading zeros can be dropped from any group• Can drop group(s) of zeros and replace with :: -
but only once in an address• V6 loopback address ::1• Subnet mask uses Classless Inter-Domain Routing
(CIDR) where /x is the number of bits in mask
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More IPv6
• Computer boots and assigns itself a link-local address (FE80:: ) – first 64 bits
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IPv6
• Last part of address is, for Windows, a random value for the last 64 bits.
• Another way to do it is to use MAC address called Extended Unique Identifier, 64 bit or EUI-64
• The last 64 bits are node so subnet is never longer than /64
• IANA passes out /32 subnets to big ISPs and end users; ISPs had out /48 and /64 subnets
• Subnet Masks are mostly between /48 and /64
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Global Addresses
• Need a GA to get to Internet• Easiest way is to request it from default
gateway router with Router Solicitation message (FF02::2)
• Router responds with Router Advertisement which is its network ID and subnet (and DNS)
• Computer generates the rest of address as before (random or MAC)
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Wired Network
• NIC – The physical hardware that connects the computer system to the network media
• Protocol – The language that the computer systems use to communicate
• Network Client – The interface that allows the computer system to speak to the protocol
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NIC
• Expansion card or built-into the motherboard• Windows will recognize, configure and provide
driver(s) for most current NICs• If not, Add Hardware Wizard will automatically
run and ask for driver media• If you have to run the Add Hardware Wizard, you
did something really, really wrong• Duplex – both talk and listen• Half-duplex – talk or listen
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Link Lights
• Can have one to four, any color(s)• Give status – something will light up when
cable is connected at both ends• If no lights, you have network problems to fix
(first place to look)• Switches also have link lights so you can check
both ends of connection• Solid green means connectivity; flashing green
means intermittent connectivity
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Wake on LAN
• Send either a special pattern or “magic packet”
• Have to configure both Windows (network) and CMOS to have this work
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Sharing Drives and Folders
• Set both the Network and NTFS permissions; set Network to everyone full control then tune with NTFS permissions
• Can map a network location to a drive letter• Make sure File and Printer Sharing is turned
on
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UNC
• Universal Naming Convention : universal to Microsoft anyway
• \\server\resource
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NET command
• Type NET at command prompt
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NBTSTAT
• NetBIOS over TCP/IP Statistics• NetBIOS long gone but command remains• Useful to see what is connected to network
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Troubleshooting
• For exams: it is getting a computer back on the network
• Need to take a giant leap up in quality of skills• Is it the computer, the network, or both?
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Losing Physical Connectivity
• Pretty obvious in Windows with red Xs and dialog boxes
• Can also find link lights out on network connection
• Is cable unplugged at either end?• Is NIC disabled in Device Manager?• If you only see yourself in Network Discovery• Check if any other stations are down• Failed NIC can lose connectivity
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Cable Testing
• Many disconnect problems are in the patch cable to the wall
• Midrange Time-Domain Reflectometer (TDR) can be handy to pinpoint break in cable
• Replace the whole cable, don’t try to patch it (pun intended!)
• Use a tone-tester to find other end of a cable
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Fail to connect to New Resource
• Often a configuration issue – make sure it is shared correctly
• Make sure you have valid user and password • Do you have permission(s)?• Correct homegroup/domain/workgroup?
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Fail to connect to used resource
• Try nbtstat –s• Try net view• Check that serving system is on and connected
to network