Networking Scenario Based Interview Questions

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  1. In the below diagram, all the devices are recently powered up. Which device will issue ARP request?
  2.  In the given diagram, EIGRP neighborship is formed between R1 and R2 on Interface Gi0/0. Both the primary and secondary IPs are configured under EIGRP AS 1. How many Neighborship will be formed between R1 and R2?
  3. In the given diagram, Switch 1 has Vlan 10 as native VLAN over trunk while Switch 2 has VLAN 20 as native VLAN over trunk. Can PC1 ping PC2?
  4. Can a Switch have more than one Native VLAN over Trunk?
  5. Will the below diagram support HSRP/VRRP on interface Gi0/0 and Gi0/1 of Cisco 1941 Router?

  6. Can 2 HSRP routers becomes Active/Active?
  7. What is the use of LSA4? Can LSA 3 serve the work of LSA4 in any of scenario?
  8. In the given scenario, Loopback0 (2.2.2.2/32) is advertised into OSPF. Next, OSPF is redistributed into BGP. Will R3 receive the route of 2.2.2.2/32?

  9. In which LSA will R1 share route of Loopbacks to R2 and how many LSAs will be generated? Further, how many LSAs will R2 send to R3?
  10. Can we configure /32 IP on physical Interface of Router?
  11. In the given below setup, will OSPF come up?
  12. In the below given setup, will OSPF come up?
  13. In the given setup, if PC2 is disconnected, what will happen to mac-address table?
  14. In the above question, what should be the value of default gateway on the TCP/IP adapter settings of PCs for communication between them to be successful?
  15. A router has 3 interfaces – Gi0/0, Gi0/1 and Gi0/2. If the router receives an Ethernet frame with destination mac-address FF-FF-FF-FF-FF-FF on Gi0/0, Will the router forward the frame out from Gi0/1 and Gi0/2?
  16. In the below diagram, R2 receives a packet from R1 destined to a network behind R3. The TTL of received packet by R2 is 1. What will the Router do with packet?
  17. A merger has taken place between 2 Organizations with AS 1 and AS 2 respectively. A new Router R4 has been installed to connect both the organization networks. After R4 forming neighborship all the 3 directly connected neighbors, still the networks are unable to communicate. What could be the probable cause?The Interface details of R4 is given below –
  18. In the HSRP Setup, R1 is the active HSRP Router and forwards the traffic towards WAN1.The customer wants specific destination traffic to take WAN2 path and rest of default traffic to take path via WAN1 on same HSRP Group. Would this be possible?
  19. In the given setup, R1 is Active HSRP Router .Due to WAN link going down, R2 takes on the role of active Router. Now, Layer 2 Switch has MAC table information to forward the traffic towards R1 (Mac address of HSRP master). Which mechanism tells SW1 to forward the HSRP traffic towards R2 and not R1?
  20. In the below given configuration, R10, R1, R2 and R3 are forming EIGRP neighborship across AS1 and 2. But R10 I unable to any external network like 192.168.23.0/24 and 3.3.3.0/24. What could be the probable cause?
  21. In the below given OSPF setup (comprising of Area0, Area 1 and Area 2), R1 is unable receives routes from Area 2. As an architect for this network, what are your recommendations on the design?
  22. In the below scenario, CE1 is active HSRP GW for LAN while CE2 is standby. Both the CEs are running static Default Route towards WAN Links and monitoring their WAN Internet (Ethernet Links) status for HSRP failover. However, one day cable between 1st link L2 SW and PE1 got faulty which lead to downtime of 1 hour. Company management is very critical on the downtime and wants the architect to resolve the issue. As a network architect, what is your proposal on the case (considering provide routers don’t support dynamic Routing)?
  23. In the below given diagram, there is a requirement to have Active-Active link for incoming traffic from WAN 1 and 2. To achieve this scenario, the LAN has been divided into Network X and Y. How can this be achieved?
  24. In the previous question, now we need to have Active-Active flow for outgoing traffic towards WAN 1 and 2. How can this be achieved?
  25. In the given diagram, 1.1.1.0/24 is not learnt by R3. What could be the probable cause?
  26. In the below given diagram, the newly installed Access point is able to reach the controller (through ping) but AP to WLC controller registration is not happening. What could be the key reasons for this issue?
  27. In the below given setup, eBGP is running between R1, R2 and R3. For some reason R3 is not learning Network X routes advertised by R1. What could be the probable cause of this? How can this be resolved?
  28. In OSPF, an area can scale upto how many maximum number of Routers?
  29. As shown in the below given diagram, 3 Switch have been connected to each other over Gigabit Ethernet links. Which Switch will become Root Bridge and on what criteria?
  30. In the below given scenario, which port on which switch will go into blocking stage? Kindly elaborate the reason?

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