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Home / Interview Subjects / BGP
WithoutBook LIVE Mock Interviews BGP Related interview subjects: 5

Interview Questions and Answers

Know the top BGP interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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The Best LIVE Mock Interview - You should go through before interview

Know the top BGP interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Freshers / Beginner level questions & answers

Ques 1

What is BGP?

BGP (Border Gateway Protocol) is a standardized exterior gateway protocol used to exchange routing and reachability information between different autonomous systems (ASes) on the Internet.
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Ques 2

Explain the difference between eBGP and iBGP.

eBGP (External BGP) is used between routers in different autonomous systems, while iBGP (Internal BGP) is used between routers within the same autonomous system.
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Ques 8

What is the purpose of the BGP ORIGIN attribute?

The BGP ORIGIN attribute indicates the origin of the route, such as whether it is learned from an Interior Gateway Protocol (IGP), EGP (Exterior Gateway Protocol), or is locally originated.
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Ques 9

Explain BGP route withdrawal process.

BGP route withdrawal occurs when a BGP router advertises a prefix with the route's next hop set to an unreachable IP address, effectively withdrawing the route from the routing table.
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Ques 10

What is the purpose of the BGP UPDATE message?

The BGP UPDATE message is used to convey routing information between BGP peers. It includes information about new routes, withdrawn routes, and modifications to existing routes.
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Ques 11

Explain BGP route advertisement process.

BGP route advertisement involves a router informing its BGP peers about the routes it has learned. This process helps build and update the BGP routing tables across the network.
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Ques 12

What is the purpose of the BGP NLRI (Network Layer Reachability Information) field?

The BGP NLRI field carries information about the IP prefixes and their associated routing attributes that are being advertised in a BGP UPDATE message.
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Intermediate / 1 to 5 years experienced level questions & answers

Ques 13

How does BGP select the best route?

BGP uses the BGP decision process, which considers factors like the highest weight, local preference, AS_PATH length, origin type, and the router ID to select the best route.
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Ques 15

What is BGP synchronization?

BGP synchronization is a mechanism that ensures that routes learned from iBGP peers are not used until they are synchronized with an IGP (Interior Gateway Protocol) in the same AS.
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Ques 16

Explain the concept of BGP peer groups.

BGP peer groups are used to simplify the configuration and management of multiple BGP neighbors by grouping them together and applying common configuration parameters.
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Ques 20

What is BGP maximum-prefix limit?

BGP maximum-prefix limit is a mechanism to prevent a BGP router from being overwhelmed by a large number of advertised prefixes by imposing a limit on the number of accepted prefixes.
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Ques 22

Explain BGP TTL security check.

BGP TTL security check is a feature that checks the Time-to-Live (TTL) value in the IP header of BGP packets to prevent certain types of BGP attacks, such as TTL exhaustion attacks.
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Ques 23

What is the BGP MED (Multi-Exit Discriminator) attribute used for?

The BGP MED attribute is used to influence the path selection process by indicating the preferred exit point from an AS when multiple exit points exist.
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Ques 25

What is BGP graceful restart?

BGP graceful restart is a mechanism that allows a BGP router to continue forwarding traffic using the previously known BGP routing information during a restart, reducing the impact of a restart on the network.
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Experienced / Expert level questions & answers

Ques 30

Explain the BGP best path selection process.

BGP best path selection process involves evaluating various attributes, such as weight, local preference, AS_PATH, origin, MED, and the router ID, to determine the best route for a destination.
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