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18 Cards in this Set
- Front
- Back
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What is a leased line? |
A cable that runs from CO main office to customer premises. Provides a WAN link |
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What is CSU/DSU |
Channel service unit / data service unit. |
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What is HDLC? |
Higher data link control . This is one of the data link protocol used the send IP packets over leased lines |
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What does a csu/dsu connect too? |
Its connects to a router serial interface on one side and the leased line on the other side. |
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Can routers have inbuilt CSU/DSU? |
Yes. There for the router serial interface connects direct to the leased line cable |
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What are the predefined speeds telco provides for leased lines? |
The lowest is multiples of 6.4kbps and highest is multiples of 1.5mbps |
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How to make a home WAN link |
Get a DTE cable( data terminal equipment and connect it to a a router onnone side. Then connect the DCE (data communications equipment) cable to the DTE. The DCE acts like a crossover cable |
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What is tge function of the CSU/DSU? |
Provides the funtion of CLOCKING which sets the timing/rate of bits being sent from the router over the serial link |
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Name two types of data link protocols used on leased lines? |
HDLC - Higher Data Layer Control PPP - Point to Point protocol |
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What field is added the HDLC header thats is not not used as the standard ISO |
Type - As routers need to know the type of packet when forwarding |
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What is the Data link logic of HDLC |
1) PC1 Encapsultes IP Packet in Etherner frame and forwards it to R1 2) R1 De-capsulates IP packet and encapsulates it with a HDLC HEADER AND TRAILER and sends to to R2 3) R2 De- encapsulates tye IP packet and encapsulates it with a Ethernet header to be forwrded to PC2 |
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Are leased line Full or Half duplex? |
FULL. as these send and receive data at the same time |
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Explain the basic setup of Ethernet WAN technology? |
Routers connect to and ethernet link fiber cable 1000base lx The etherlink from CPE connects to some Point of Presence on the ISP network |
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What data link Protocol does Ethernet WAN technology use? |
Use EoMPLS- MULTI PROTOCOL LABEL SWITCHING Whic is rhe same format as an Ethernet header and trailer |
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Name 3 types of Internet Access links ? |
1) leased lines 2) Dsl 3) Cabled |
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Explain DSL LINES? |
Are short WAN links between Customer and ISP router Connection is provided through your ANALOGUE phone line No change needa to be made to existing equipmenr |
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What needs to be added exiating phone cuatomer for DSL to work? |
Just need to install a Dsl modem on Cx side that coonects to phone cable on the wall sideAnd a router with Ethernet on the other aide of DSL modem. On the ISP side theres needs to be a DSLAM. |
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What Internet access technologies use asymmetric speeds? |
DSL AND CABLE They have a greater downstream speed than upspeed |
