InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Describe Bgp Communities. Name Well-known Communities.? |
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Answer» BGP communities are commonly used to control route policies in the BGP environment and used as flags in order to mark it over the SET of network prefixes. BGP communities’ information can be shared with a NEIGHBOR by using the command “neighbor x.x.x.x send-community standard | extended | both” and can be applied using route-maps to a defined neighbor. Some well-known BGP communities are: Local-AS: Share the prefixes with iBGP-confederation PEERS only. No-Advertise: Do not share the prefixes with ANYONE. No-Export: Do not share the prefixes with another Global AS, share within the Public-AS only. Internet: Share the prefixes with all. BGP communities are commonly used to control route policies in the BGP environment and used as flags in order to mark it over the set of network prefixes. BGP communities’ information can be shared with a neighbor by using the command “neighbor x.x.x.x send-community standard | extended | both” and can be applied using route-maps to a defined neighbor. Some well-known BGP communities are: Local-AS: Share the prefixes with iBGP-confederation peers only. No-Advertise: Do not share the prefixes with anyone. No-Export: Do not share the prefixes with another Global AS, share within the Public-AS only. Internet: Share the prefixes with all. |
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| 2. |
Explain Bgp Recursive Lookup And Site Of Origin (soo) ? |
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Answer» BGP RECURSIVE lookup involves the router looking up the BGP route and BGP next hop to reach a destination in the remote AS. Then the router will LOOK up the route into IGP to reach the BGP next hop. This MECHANISM is known as BGP recursive lookup. BGP site of origin (SoO) is a loop prevention TECHNIQUE in the MPLS backbone environment. BGP SoO is associated with a CE-neighbor; that’s why whenever the PE router advertise a PREFIX to a CE neighbor, it check the SoO of the prefix with the SoO of the BGP neighbor to avoid loops. BGP recursive lookup involves the router looking up the BGP route and BGP next hop to reach a destination in the remote AS. Then the router will look up the route into IGP to reach the BGP next hop. This mechanism is known as BGP recursive lookup. BGP site of origin (SoO) is a loop prevention technique in the MPLS backbone environment. BGP SoO is associated with a CE-neighbor; that’s why whenever the PE router advertise a prefix to a CE neighbor, it check the SoO of the prefix with the SoO of the BGP neighbor to avoid loops. |
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| 3. |
Name Bgp Path Attributes To Control Incoming And Outgoing Traffic. |
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Answer» BGP has MULTIPLE path attributes to influencing traffic FLOW. In the most common practice we do manipulate incoming traffic USING AS-Path prepending and MED (multi-exit discriminator). And, to influence outgoing traffic, weight and local PREFERENCE are the best choices. BGP has multiple path attributes to influencing traffic flow. In the most common practice we do manipulate incoming traffic using AS-Path prepending and MED (multi-exit discriminator). And, to influence outgoing traffic, weight and local preference are the best choices. |
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