routing protocol
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BGP and BGP Path Attributes
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BGP, which stands for Border Gateway Protocol, is a standardized exterior gateway protocol used in computer networking and the internet to exchange routing and reachability information between autonomous systems (ASes). Autonomous systems are networks or collections of networks that are administered by a single organization and operate under a common […]
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BGP interview questions
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BGP protocol interview questions Q. What is a Local Preference? Q. What is the difference between EBGP and IBGP neighborship ?Q. What transport protocol does BGP use? Q. What is an AS_PATH and what is it used for? Q. How can you use BGP for load balancing traffic outbound? Q. […]
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Network engineer Interview Question
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Networking Interview Question for routing protocol OSPF Q. How many types of area exist in OSPF and types of LSA are allowed ? Q. Different OSPF packet types ? Q. If you see how as DRother under show ip ospf neigbor . Whats wrong with the output ? Q. How […]
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ospf scenario
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ospf scenario Highest IP address ABR routes convert the type7 into type 5. Default route is not generated by default in area nssa unless “are nssa default originate ” configured. Totally stubby NSSA area generate the default route by default. DR/BDR does not support the preempt therefore if DR fails […]
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ospf scenario based questions
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ospf scenario based questions Scenario 1 – OSPF full neigborship is not coming up between routers — 1. Hello and Dead timer or Area ID, Authentication password/type/key or Area type are mismatch between router.2. Trying to build OSPF neigborship on secondary address.4. OSPF not enabled on correct interface or […]
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eigrp scenario based interview questions and answers
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We are discussing about EIGRP Scenario based question – Scenario 1 – EIGRP neighbor not coming up – 1.AS number mismatch between neighbors.2.K value mismatch between routers.3.IP is on different subnets4.Primary and secondary address on interface mismatch between routers.5.layer 2 switch/hub connecting different subnet devices in the same VLAN. For […]
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bgp troubleshooting scenarios
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BGP Troubleshooting Scenario 1- There are some reason router do not establish neighborship with peer- This is very important question for interview also 1) Peer ip address is not reachable. 2) port 179 is blocked by a firewall or access list. 3) BGP configuration is not correct like wrong […]
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ospf configuration troubleshooting
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There are some command to help troubleshoot of OSPF and configuration. 1- show ip protocols (this command confirm on router , how many protocol is running include OSPF) 2 – show ip route ( dynamic routes are learned by OSPF) 3- show ip ospf (display OSPF info for all OSPF processes) 4- show ip […]
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BGP Troubleshooting in advanced
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BGP Troubleshooting. Problem: BGP peer is not getting establish between routers. Cause : 1) Peer ip address is not reachable . 2) port 179 is blocked by firewall or access-list. 3) BGP configuration is not correct like wrong peer address local-as or remote-as, wrong AS number, wrong authentication/MD5 password or […]
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OSPF Troubleshooting like Exstart state exchange
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OSPF Troubleshooting– Problem :OSPF full neigborship is not coming up between routers Cause : 1. Hello and Dead timer or Area ID, Authentication password/type/key or Area type are mismatch between router. 2. Trying to build OSPF neigborship on secondary address. 4. OSPF not enabled on correct interface or network […]