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35 Cards in this Set
- Front
- Back
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How does MetroE appear from a logical perspective? |
Like a single ethernet switch |
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What OSI layer does MetroE reside at? |
Layer 2 (Data Link) |
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What is an access link? |
The link between a customer and an ISP |
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What is another name for an access link? |
A user network interface (UNI) |
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What's the max segment length for 100Base-LX10? |
10 km |
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What's the max segment length for 1000Base-LX? |
5 km |
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What is the max segment length for 1000Base-LX10? |
10 km |
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What is the max segment length for 1000Base-ZX? |
100 km |
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What is the max segment length for 10GBase-LR? |
10 km |
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What is the max segment length for 10GBase-ER? |
40 km |
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What are the 3 MetroE service types? |
E-Line, E-LAN, and E-Tree |
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What is another name for Ethernet Line Service (E-Line)? |
Virtual Private Wire Service (VPWS) |
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What is another name for Ethernet LAN Service (E-LAN)? |
Virtual Private LAN Service (VPLS) |
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What logical topology does E-Line use? |
Point-to-point |
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What logical topology does E-LAN use? |
Full mesh |
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What logical topology does E-Tree use? |
Hub-and-spoke/partial mesh |
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What does MetroE use to define which customer devices can communicate? |
An Ethernet Virtual Connection (EVC) |
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Does MetroE require a router at the customer edge? Why or why not? |
No- because it forms a logical ethernet segment, customer can use a switch at the edge |
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How does E-Tree behave? |
As if there is a central switch that all communications must go through |
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Do routers in an E-Tree setup need to be in the same or different subnets? Why? |
The same subnet- they all connect to the same virtual switch |
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What is a Committed Information Rate (CIR)? |
the rate an ISP guarantees when a customer rents a partial line |
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What 2 tools are used to maintain a Committed Information Rate (CIR)? |
Policing and shaping |
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What does policing do? |
Discards frames when a connection exceeds a specified rate |
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What does shaping do? |
Throttles output rate on a router (queuing packets) |
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Where is an MPLS header placed in a segment? |
Between the L2 and L3 headers |
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Does MPLS encrypt data? |
No, but it does guarantee privacy |
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What network device is usually used at the edge with MPLS? |
Routers |
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Is MPLS ethernet-only? |
No, MPLS supports a variety of L2 networks |
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Do customer and provider routers in an MPLS setup need to be able to exchange routes? |
Yes |
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What is route redistribution? |
Taking routes learned with one protocol and advertising them with another |
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What routing protocol does MPLS use internally? |
Multi protocol BGP (MPBGP) |
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What advantage does MPBGP provide to service providers using MPLS? |
The ability to keep routes from different customers separate |
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What is a "super-backbone"? |
An ISP-created Area 0 for OSPF for MPLS, comprising all of the ISP's network |
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Can customer routers be part of an OSPF for MPLS super-backbone? |
Yes, Area 0 can extend on both sides of the ISP's network |
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When using EIGRP as the CE-PE protocol for MPLS, do routers on either side of the WAN need to have the same ASN? |
No |
