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Cisco Interview Questions...

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  • Cisco Interview Questions...

    I recently applied to a company, and before I even walked into the interview, they had me take a "personality test". One I got there, they made me take an "IQ test". And then before I met with the hiring manager, they made me take a "Network Engineer Exam.".. they told me I had a half hour to complete this. This is NOT a company I would want to work for... but I copied the questions on the Engineer exam. Tell me how many of these you could answer....I'm a CCNP, and found a lot of them difficult!

    1) Observe the following static route:

    ip route Gig1/1

    • What is an advantage of referencing interface Gig1/1 instead of a next-hop?
    • What is a disadvantage

    2) What is a “floating static” route?

    3) What is a route-map? Name three configurations that might reference a route-map.

    4) Observe the follow access-list:

    ip access-list extended OUTSIDE_ACL
    deny any

    This ACL is applied inbound to an interface. Will inbound traffic destined to be
    allowed or denied?

    5) An inbound extended ACL named ALLOW_IN exists on your company Border Router. It is applied to the “outside” interface with the “access-group ALLOW_IN in” command. A junior admin accidentally deletes ACL_ALLOW_IN from the running-config. Is inbound traffic permitted or denied on the outside interface? Why?

    6) Your company wants to configure an Internet Border Router with the following policy: Any traffic leaving the internal network destined to the internet is permitted. Traffic sourced from the public internet addresses is to be controlled with and extended ACL applied inbound and to the outside (internet facing) interface. An internal user wants to be able to browse a website at port 80 from his PC with source IP

    Does the ACL need to be modified to permit the connection to If so, write an ACL statement that would facilitate the connection.

    7) What is a jumbo packet? How would you enable jumbo packet support on a Cisco device? Since configuration steps very between devices/models, choose any device and explain.

    Write the CLI statements for configuring an industry-standard trunk link between two Cisco switches.

    9) Write the CLI statements for configuring an etherchannel between two Cisco 3560 switches. Use two connections between ports G0/1 and G0/2 on each switch respectively. The etherchannel should be configured to disable negotiation between switches.

    10) What is ACS and how is it used?

    11) You have two Cisco routers with OSPF running on a single link between them. The subnet for the link is How would you configure the interfaces to bypass the DR election and immediately form an adjacency during start-up?

    12) What is netflow and how is it used?

    13) What Cisco feature is available on medium to upper level platform routers (6500, 7200, ASR series…) that allows you to view current traffic through the router at the CLI?

    14) An OSPF area is configured as “totally stubby” What will “show ip route ospf” reveal at the CLI?

    15) In your personal professional experience, have you worked with a company that had a public BGP number? What was the number(s)?

    16) You are troubleshooting a connectivity issue from a PC within your network to a public site. The PC is using a custom application that forms a TCP connection to port 5555.

    a) What common CLI tool can you use to test the connection from the PC?
    b) You find that the connection is not forming. What very common application could you use to
    analyze the connection attempts?
    c) You suspect that the problem is not network related and is probably due to an issue at the far
    end. The remote party confirms they are receiving your traffic. What indication seen with
    this tool could support your claim?

    17) Your company has the registered C-class range From your border router you will form a BGP peering relationship to an IP remote AS 1111. Your BGP peer has IP and your AS id 5555. You have two internal interfaces on your border router as well. The IP for one of these interfaces is the other is Write all necessary CLI commands to advertise your class-C range to AS 1111.

    1 A router learns the following routes to destination
    VIA OSPF: next-hop VIA EIGRP: net-hop
    VIA STATIC: next-hop VIA RIP: next-hop

    19) Please draw a layer 1 network diagram

    20) Please draw a layer 2 network diagram

    21) Please draw a layer 3 network diagram

  • #2
    Re: Cisco Interview Questions...

    Double post?
    ** Remember to give credit where credit is due and leave reputation points where appropriate **


    • #3
      Re: Cisco Interview Questions...

      Is it unacceptable to post on 2 different boards? I'd actually like to see how people answer some of the more obscure questions.


      • #4
        Re: Cisco Interview Questions...

        Not necessarily, but we have had a surfeit of spammers here (not that I am suggesting you are one ) so we are vigilant and wary of unexpected behaviour by members.

        Being a non-cisco person, my score is likely to be a big fat zero!
        Tom Jones
        MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
        PhD, MSc, FIAP, MIITT
        IT Trainer / Consultant
        Ossian Ltd

        ** Remember to give credit where credit is due and leave reputation points where appropriate **


        • #5
          Re: Cisco Interview Questions...

          Sounds exactly like the interview I had at cisco last year. I was applying for a spot on their Telepresence team. Granted I dont have much experience with Voip ( I manage a cisco voip network where I work now but I wasn't involved with the design etc). Their where about 6 guys in the interview and they had me drawing diagrams on the whiteboard etc. I did really well but wasn't chosen as I lacked on the voice side but they said my R&S knowledge was excellent. Best interview I ever had and I learned a lot from it.

          Granted some of those questions are difficult. I had the most trouble with the netflow and BGP questions as those are 2 things I dont use much, but the other questions where fairly easy imo. I could answer 18 of them correctly and probably take a best guess at the others. I too am a CCNP.
          CCNA, CCNA-Security, CCNP
          CCIE Security (In Progress)