Author Topic: Network engineer interview questions  (Read 11725 times)

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Offline cyclon

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Network engineer interview questions
« on: 20 February 2008, 12:57:39 »

  • 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


  • 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


  • What are they
  • Diff types
  • Write an example if you want to allow and to deny?
  • Well-known port numbers (DNS - 53 and etc?)

  • What is that
  • What is the diff b/w L2 and L3 QoS
  • How it works


  • 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


  • VLANs
  • STP
  • How a L2 switch works with broadcast, unicast, multicast, known/unknown traffic
  • Port monitoring and mirroring
  • L3 switch, how it works
  • PIM sparse and dense modes

Some Questions?

   1. User(s) are complaining of delays when using the network. What would you do?
   2. What are some of the problems associated with operating a switched LAN?
   3. Name some of the ways of combining TCP/IP traffic and SNA traffic over the same link.
   4. What sort of cabling is suitable for Fast Ethernet protocols?
   5. What is a Class D IP address?
   6. Why do I sometimes lose a server?s address when using more than one server?
   7. What is Firewall?
   8. How do I monitor the activity of sockets?
   9. How would I put my socket in non-blocking mode?
  10. What are RAW sockets?
  11. What is the role of TCP protocol and IP protocol.
  12. What is UDP?
  13. How can I make my server a daemon?
  14. How should I choose a port number for my server?
  15. Layers in TCP/IP
  16. How can I be sure that a UDP message is received?
  17. How to get IP header of a UDP message
  18. Writing UDP/SOCK_DGRAM applications
  19. How many bytes in an IPX network address?
  20. What is the difference between MUTEX and Semaphore?
  21. What is priority inversion?
  22. Different Solutions to dining philosophers problem.
  23. What is a message queue?
  24. Questions on Shared Memory.
  25. What is DHCP?
  26. Working of ping, telnet, gopher.
  27. Can I connect two computers to internet using same line ?

Quiestions Again

   1. Explain how traceroute, ping, and tcpdump work and what they are used for?
   2. Describe a case where you have used these tools to troubleshoot.
   3. What is the last major networking problem you troubleshot and solved on your own in the last year?
   4. What LAN analyzer tools are you familiar with and describe how you use them to troubleshoot and on what media and network types.
   5. Explain the contents of a routing table (default route, next hop, etc.)
   6. What routing protocols have you configured?
   7. Describe the commands to set up a route.
   8. What routing problems have you troubleshot?
   9. How do you display a routing table on a Cisco? On a host?
  10. How do you use a routing table and for what?
  11. What is a route flap?
  12. What is a metric?
  13. When do you use BGP, IGRP, OSPF, Static Routes?
  14. What do you see as current networking security issues (e.g. NFS mounting, spoofing, one time passwords, etc.)?
  15. Describe a routing filter and what it does.
  16. Describe an access list and what it does.
  17. What is a network management system?
  18. Describe how SNMP works.
  19. Describe the working environment you are currently in, e.g. frequent interruptions, frequent priority shifting, team or individual.
  20. What do you use to write documentation? Editor? Mail reader?
  21. What platform (s) do you currently work on at your desk?
  22. How do you manage multiple concurrent high level projects?
  23. Describe a recent short term stressful situation and how you managed it.
  24. How do you manage a long term demanding stressful work environment?
  25. Have you worked in an assignment based environment, e.g. work request/trouble ticket system, and if so, describe that environment.
  26. Describe what network statistics or measurement tools you are familiar with and how you have used them.
  27. Describe what a VPN is and how it works.
  28. Describe how VoIP works.
  29. Describe methods of QoS.
  30. How does ToS bit work?

Questions again 2 :scare:

1. How do you implement a packet filter that distinguishes following cases and selects first case and rejects...
2.What are TP-Lite and TP-Heavy Monitors?
3.List out the benefits obtained by using the Client/Server oriented TP MonitorsClient/Server applications...
4.What are the main components of Transaction-based Systems?
5.What is a TP Monitor?
6.What is the difference between an unspecified passive open and a fully specified passive open?
7.Explain the function of Transmission Control Block?
8.What is a Management Information Base (MIB)?
9.What is anonymous FTP and why would you use it?
10.What is a pseudo tty?
11.What is REX?
12.What does the Mount protocol do?
13.What is the difference between interior and exterior neighbor gateways?
14.What are the advantages and disadvantages of the three types of routing tables?
15.What is a TCP connection table?
16.What is source route?
17.What is Proxy ARP?
18.What is a Multi-homed Host?
19.What is NVT (Network Virtual Terminal)?
20.What is Gateway-to-Gateway protocol?

Latest Questions in Networking Interview Questions  :yes:

1.what is the difference between packet switched, cell switched and circuit switched technology? can we configure mail-server in win2003ADS
3.What is Frame Relay?
4.difference b/w subnetmask and default gateway
5.I have been called up for the tech interview on next week for the post of Network Engineer. Help me out...
6.What is difference between TCP/IP and UDP?
7.Encryption operation performed at what layer1.presentation layer2.physical layer3.transport layer
8.If you have 3 pc's with static IP's and there is one PC workstation that has FTP going through a router...
9.What are the network monitoring tools? Like what tools do you use to monitor network connections?
10.In tcp/ip udp is connection less , why?

Sekarang gimana? Udah siap kan. Mudah2an siap. Have fun!
« Last Edit: 22 February 2008, 07:47:10 by 1nf0rm4t1c5 »

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Network engineer interview questions
« on: 20 February 2008, 12:57:39 »
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Offline 1nf0rm4t1c5

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Re: Network engineer interview questions
« Reply #1 on: 20 February 2008, 14:24:16 »
wah bagus2... ini banyak dicari sama yang pingin kerja sbg International Network Engineer.


Offline next_icon99

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Re: Network engineer interview questions
« Reply #2 on: 21 February 2008, 18:49:20 »
wuiiih  :nerd:
jawabannya juga harus pake bahasa yang sama yak.

Offline ajie

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Re: Network engineer interview questions
« Reply #3 on: 31 March 2008, 04:32:09 »
Mmmm....Thanks :yes:

Offline TSG

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Re: Network engineer interview questions
« Reply #4 on: 28 April 2008, 08:18:16 »
tengkyu bro..  :canadian:

Offline utchanovsky

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Re: Network engineer interview questions
« Reply #5 on: 01 May 2008, 05:22:15 »
lha ini mah kerjaan yang biasa megangin RJ45 n Crimping tools nih

Offline Dk-Mag3-zordforz

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Re: Network engineer interview questions
« Reply #6 on: 09 April 2009, 13:21:34 »
gpp lah.. nice info gan..  :yes:

Offline arm88

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Re: Network engineer interview questions
« Reply #7 on: 09 April 2009, 23:11:12 »
lha ini mah kerjaan yang biasa megangin RJ45 n Crimping tools nih
ho'oh kerjaannya ngukur ma ngelurusin kabel..

info bagus umCompscience..
kali2 aj ntar gw dipanggil ma Cisco...

Offline hamburg113

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Re: Network engineer interview questions
« Reply #8 on: 12 September 2011, 08:49:34 »

Thanks very much for this comment. It help me to think about my ideals.

Tks again and pls keep posting.

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Best regards.

« Last Edit: 18 September 2011, 19:36:13 by hamburg113 »