BGP Interview Questions

Question 1 How many states used in BGP ?

Question 2 Which is the port number used by BGP ?

Question 3 What is the weight value for locally originated routes ?

Question 4 What is the Weight value for non locally originated routes ?

Question 5 What is the default local preference value ?

Question 6 How many messages used by BGP ?

Question 7 What is the default administrative distance for eBGP ?

Question 8 What is the default administrative distance for iBGP ?

Question 9 What is the deference between local preference and weight ?

Question 10 How many types of formats used for community ?

Question 11 How many types of well known communities ?

Question 12 Can we use two BGP process on a single cisco router ?

Question 13 Why BGP behaves like a distance vector routing protocol and when ?

Question 14 What is the route reflector ?

Question 15 Can we use more than 1 route reflector servers in a single cluster ?

Question 16 What will do the route reflector if best route is received from a non client ?

Question 17 What will do the route reflector if best route is received from a client ?

Question 18 What is the meant by non client in route reflector ?

Question 19 What is the route reflector cluster ?

Question 20 Can we use IGP metric as an MED for redistributed routes ?

Question 21 What is the BGP path section criteria ?

Question 22 What is the recursive lookup in BGP ?

Question 23 What is the rage of private autonomous systems for BGP ?

Question 24 What does mean if nest hop is set to 0.0.0.0 for a route ?

Question 25 What is the synchronization rule ?

Question 26 What is the ConnectRetry timer ?

Question 27 Can we change the ConnectRetry timer ?

Question 28 What is the route dampening ?

Question 29 What does mean if route is indicating by H ?

Question 30 What is the reason if route is not present in BGP table ?

Question 31 How can be influence the outgoing traffic ?

Question 32 How can we influence the incoming traffic ?

Question 33 How can we change the next hop ?

Question 34 Can be establish the BGP if IP address on both ends are in different subnet ?

Question 35 What is the default TTL value of iBGP ?

Question 36 What is the default TTL value of eBGP ?

Question 37 Can routers on different ASN become Neighbors ?

Question 38 What is the difference between iBGP and eBGP ?

Question 39 What is the loop prevention mechanism for eBGP ?

Question 40 What is the loop prevention mechanism for iBGP ?

Question 41 Do we need 3 way handshake to establish the BGP peering ?

Question 42 What is the hard reset ?

Question 43 What is the soft reset ?

Question 44 What is the soft reconfiguration ?

Question 45 Can be establish the BGP peering if hold time is different ?

Question 46 Can be establish the BGP peering if hold time is 0 at both side ?

Question 47 what are information contain by open message ?

Question 48 What is the attribute code of weight ?

Question 49 What is the attribute code of local preference ?

Question 50 Why should use the route reflector and when ?

Question 51 Can we configure the route reflector on non cisco routers ?

Question 52 What are the requirements for a route to be install in BGP table ?

Question 53 How can we disable a BGP peer ?

Question 54 How many types of tables used by BGP ?

Question 55 What is the SoO ?

Question 56 What should we check if BGP peer is stuck in idle or active state ?

Question 57 What is the role of split horizon in BGP ?

Question 58 What are necessary commands to configure the BGP ?

Question 59 What are the extra commands required when we are configuring the BGP over loopback address ?

Question 60 What is the TTL security ?

Question 61 What is the disable connect ?

Question 62 What is the difference between always-compare-med and deterministic-med?

Question 63 Can we use BGP confederations under the BGP route reflector cluster ?

Question 64 Which IP address is sent as the next hop by eBGP ?

Question 65 will display the route reflector IP address in traceroute ?

Question 66 What is the condition advertisement ?

Question 67 How can we enable the load balancing ?

Question 68 What are the types of BGP messages ?

Question 69 What are the benefits of BGP peer group ?

Question 70 How much size of RAM recommended for download the complete global table from ISP?

Question 71 What is the reason if same route is showing twice in the output of show ip bgp x.x.x.x as received from same neighbor?

Question 72 What is the use of BGP AS prepend ?

Question 73 What is the use of BGP backdoor ?

Question 74 What is the BGP confederation ?

Question 75 What is the cluster id and when should we configure manually ?

Question 76 What can be the reason if route is indication by r ?

Question 77 What can be the reason of RIB-Failure ?

Question 78 What is the meant if we are getting error like “Protocol is not in this image” ?

Question 79 What is the cost for external routes ?

Question 80 What is the cost of internal routes ?

Question 81 What is the cost of Redistributed routes ?

Question 82 How can we change the cost of redistributed routes ?

Question 83 How many paths can be used for load balancing or load sharing ?

Question 84 How can we check the routes advertised to a BGP peer ?