Network security
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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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pci1.png
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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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PaloAlto CLI command for troubleshooting
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General Command—- show system info = //shows the uptime, serial number, … show system environmentals = //e.g. power supply failures show ntp = //time server show session info = //packet rate, number of sessions, fastpath active, etc. show session id = //session id show interface { all | } […]
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Palo Alto Traffic flow
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Contents:SECTION 1: OVERVIEW SECTION 2: INGRESS STAGE 2.1 PACKET PARSING 2.2 TUNNEL DECAPSULATION 2.3 IP DEFRAGMENTATION SECTION 3: FIREWALL SESSION LOOKUP 3.1. ZONE PROTECTION CHECKS 3.2. TCP STATE CHECK 3.3. FORWARDING SETUP 3.4. NAT POLICY LOOKUP 3.5. USER- ID 3.6. DOS PROTECTION POLICY LOOKUP 3.7. SECURITY POLICY LOOKUP 3.8. SESSION ALLOCATION SECTION 4: FIREWALL SESSION FAST PATH SECURITY PROCESSING CAPTIVE PORTAL […]
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Privacy Policy
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Privacy Policy This privacy policy has been compiled to better serve those who are concerned with how their ‘Personally Identifiable Information’ (PII) is being used online. PII, as described in US privacy law and information security, is information that can be used on its own or with other information to […]
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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 […]