Solution To: TOP 20 Network engineer interview questions.
OSPF
* Describe OSPF in your own words.
* OSPF areas, the purpose of having each of them
* Types of OSPF LSA, the purpose of each LSA type
* What exact LSA type you can see in different areas
* How OSPF establishes neighboor relation, what the stages are
* If OSPF router is stucked in each stage what the problem is and how to troubleshoot it
* OSPF hierarchy in the single or multi areas. Cool OSPF behavior in broadcast and nonbroadcast
* Draw the diagram of typical OSPF network and explain generally how it works, DR, BDR, election, ASBR, ABR, route redistribution and summarization
STP
* How it works and the purpose
* Diff types (SSTP, MSTP, RSTP) Cisco - PVST/PVST+
* root election
* Diff. port stages and timing for convergence
* Draw the typical diagram and explain how diff types of STP work
* What ports are blocking or forwarding
* How it works if there are topology changes
ACLs
* What are they
* Diff types
* Write an example if you want to allow and to deny…
* Well-known port numbers (DNS - 53 and etc…)
QOS
* What is that
* What is the diff b/w L2 and L3 QoS
* How it works
Network:
* Draw the typical network diagram you have to deal with
* explain how it works
* What part of it you are responsible
* firewall, what is that, how it works, how it is diff from ACLs
* What problems with the network you had had and how you solved it.
* What are the ways to troubleshoot the network, techniques, commands
* network security, ways to achieve it
Switching:
* VLANs
* STP
* How a L2 switch works with broadcast, unicast, multicast, known/unknown traffic
* VRRP, GLBP
* port monitoring and mirroring
* L3 switch, how it works
* PIM sparse and dense modes
OSPF
* Describe OSPF in your own words.
* OSPF areas, the purpose of having each of them
* Types of OSPF LSA, the purpose of each LSA type
* What exact LSA type you can see in different areas
* How OSPF establishes neighboor relation, what the stages are
* If OSPF router is stucked in each stage what the problem is and how to troubleshoot it
* OSPF hierarchy in the single or multi areas. Cool OSPF behavior in broadcast and nonbroadcast
* Draw the diagram of typical OSPF network and explain generally how it works, DR, BDR, election, ASBR, ABR, route redistribution and summarization
STP
* How it works and the purpose
* Diff types (SSTP, MSTP, RSTP) Cisco - PVST/PVST+
* root election
* Diff. port stages and timing for convergence
* Draw the typical diagram and explain how diff types of STP work
* What ports are blocking or forwarding
* How it works if there are topology changes
ACLs
* What are they
* Diff types
* Write an example if you want to allow and to deny…
* Well-known port numbers (DNS - 53 and etc…)
QOS
* What is that
* What is the diff b/w L2 and L3 QoS
* How it works
Network:
* Draw the typical network diagram you have to deal with
* explain how it works
* What part of it you are responsible
* firewall, what is that, how it works, how it is diff from ACLs
* What problems with the network you had had and how you solved it.
* What are the ways to troubleshoot the network, techniques, commands
* network security, ways to achieve it
Switching:
* VLANs
* STP
* How a L2 switch works with broadcast, unicast, multicast, known/unknown traffic
* VRRP, GLBP
* port monitoring and mirroring
* L3 switch, how it works
* PIM sparse and dense modes
SAMPLE NETWORK ENGINEER INTERVIEW QUESTIONS
- What is the subnet mask 10.2.1.3/22?
- What is the administrative distance of EIGRP, eBGP, iBGP?
- What is your favorite routing Protocol?
- In EIGRP, what is a Stuck in Active route?
- In OSPF, what is a totaly stubby area? What does Area Zero do?
- Which internal routing protocol would use if you needed to route between Cisco and non-Cisco equipment?
- Explain what a 3-way handshake is in TCP?
- What is a VLAN trunking protocol?
- What is the different between 802.1q and ISL?
- Explain what is an Ether-Channel?
- What do you need to do to setup a VTP domain?
- What is Spanning Tree used for?
- What is a root bridge and why do you need one?
- What is needed on a router interface to allow DHCP to function on a subnet?
- Describe what a stateful firewall is?
- What is HSRP? Is this an open standard?
- In a PIX/ASA, what are security levels used for?
- What two things are needed in a PIX/ASA firewall to allow traffic to pass from a higher security level to a lower security level?
- In IPSec VPNs, what is diffe helman? What is it used for?
- In an IPSec tunnel, what is main mode?
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