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BGP Interview Question

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(@durgeshjangid)
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  • Can router on different subnet become BGP neighbour?
  • What is the difference between eBGP multihop and TTL security?
  • Which protocol and the port number does BGP use for neighborship?
  • What is the use of BGP best path community ignore command?
  • How do I configure BGP with the use of a loopback address?
  • What is the order of preference of attributes when applied to one neighbour in BGP?
  • What does a next-hop of 0.0.0.0 mean in the show IP BGP command output?
  • What are the well-known communities of the BGP community attribute?
  • How does BGP behave differently with auto-summary enabled or disabled?
  • What formats can I use to configure the BGP community attribute?
  • When and how should I reset a BGP session?
  • Is there any special configuration needed on PIX/ASA to allow BGP sessions through it?
  • What is an autonomous system number (ASN) and how do I obtain one?
  • What is the BGP path selection criteria?
  • What is the difference between always-compare-med and deterministic-med?
  • Do internal BGP (iBGP) sessions modify the next-hop?
  • Do external BGP (eBGP) sessions modify the next-hop?
  • Do external BGP (eBGP) sessions between confederations modify the next-hop?
  • In external BGP (eBGP) sessions, which IP address is sent as the next hop?
  • Does the route reflector change the next-hop attribute of a reflected prefix?
  • How can I announce a prefix conditionally to one ISP only when I lose the connection to my primary ISP?
  • How can I configure BGP to provide load sharing and redundancy in my network?
  • How much memory should I have in my router to receive the complete BGP routing table from my ISP?
  • What are the benefits of configuring BGP peer groups?
  • Why do I see the same route twice from the same peer in BGP?
  • What is synchronization, and how does it influence BGP routes installed in the IP routing table?
  • How do I know which Cisco IOS software release supports a particular BGP feature?
  • How can I set the Multi Exit Discriminator (MED) value on prefixes advertised to external BGP (eBGP) neighbours to match the Interior Gateway Protocol (IGP) next hop metric?
  • What is the default BGP Connect Retry timer, and is it possible to tune the BGP Connect Retry timer?
  • How can I filter all IP routes advertised to a BGP neighbour except the default route 0.0.0.0/0?
  • Is it possible to track an interface and change the route availability?
  • How does IP RIB Update allocate memory?
  • What is the command to see IPv6 BGP neighbours?
  • In regards to the removal of the static route “ip route 10.10.0.0 255.255.0.0 Null0”, does no auto-summary in BGP cause all subnets of 10.10.0.0 to be advertised?
  • Why are there no statistic results when I use the debug bfd events and debug bfd packets commands?
  • Can I run two BGP process on a single router?
  • Difference between hard reset and soft reset in BGP?
  • What are different BGP message types
  • What are various BGP states?
  • Which command is used to disable BGP neighborship?
  • What are the values of keepalive and Dead timers in BGP?
  • How many public and private AS numbers are there?
  • BGP Route selection criteria?
  • Does the router have to be restarted after a new BGP Neighbor Maximum Prefix is configured?
  • Is there a command to check the advertised routes along with the prepend of the AS-paths?
  • How does neighbour soft-reconfiguration inbound command function?
  • What is the difference between when a route is injected in BGP via redistributing command or a network command?
  • How do I verify Layer 4 forwarding summary information?
  • What are IGPs and EGPs and why are they different?
  • Why is there a problem with iBGP in large networks? How can this problem be solved?
  • Name BGP path attributes to control incoming and outgoing traffic
  • My BGP is showing 0.0.0.0 as router-id; what could be the possible reason?
  • If my BGP neighbour is stuck in an idle or active state, what should I do?
  • Explain BGP recursive lookup and site of origin (SoO).
  • What do you understand by BGP split-horizon rule?
  • Describe BGP communities. Name well-known communities.
  • Can I use BGP instead of any IGP?
  • Types of a BGP routing table?
  • What is route reflector and why it is required?
  • What is no-synchronization rule?
  • What are Default BGP timers?
  • In Multihoming scenario, if the primary link gets fail, after how long traffic will be shifted to the secondary link?
  • BGP Graceful Restart, NSR and NSF?
  • How to use BGP as PE-CE backdoor link?
  • What is the advantage of using BGP AS Prepend?
  • What is cluster id in BGP?
  • What is the meaning of update-source loopback?
  • Can we use local preference outside the autonomous system?
  • What is confederation?
  • What is Route Reflector in BGP? Why is it required?
  • What will the BGP first check to see if a prefix is accessible?
  • What are the two methods for reducing the number of IBGP connection in a network?
  • What makes a neighbour internal BGP (iBGP)?
  • What the command “neighbour update-source” do?
  • Explain the term RIB in BGP?
  • Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause?
  • What is the order of preference of attributes (route-map, filter-list,prefix-list, distribute-list ) when some or all are applied to one neighbour in BGP? Kindly share for inbound updates?
  • What is the order of preference of attributes (route-map, filter-list,prefix-list, distribute-list ) when some or all are applied to one neighbour in BGP? Kindly share for inbound updates?
  • How can I verify if a BGP router announces its BGP networks and propagates them?
  • What is the difference between always-compare-med and deterministic-med?
  • Does the route reflector change the next-hop attribute of a reflected prefix?
  • How can I announce a prefix conditionally to one ISP only when I lose the connection to my primary ISP?
  • How much of minimal RAM is required to learn complete BGP routing table from one BGP peer?
  • What are the benefits of configuring BGP peer groups?
  • What is the default BGP ConnectRetry timer
  • What does r RIB-Failure mean in the show ip bgp command output?
  • How can I filter all IP routes advertised to a BGP neighbour except the default route 0.0.0.0/0?
  • In the global routing table, can the same AS number shows up more than once in a path?
  • What is the cost of external and internal BGP routes?
  • Which parameters and attributes have to be equal before MED is compared to select the best path?
  • How do we enable community propagation?
  • What is the purpose of route dampening?
  • In general which routes will affect by route dampening? eBGP or iBGP?
  • What is the default value of MED?
 
Posted : 05/03/2023 7:08 pm
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