This is simply a quick doze of some fun for those who network. Over the years I have conducted many Technical Interiews, and generally speaking, my approach is quite unlike almost all I have seen employed. When an Technical Interview is scheduled, I always ask that the interviewee have a wide berth of time, since I don’t constrain myself to time limits, but rather I do your Technical Limits, as reflected by your answers and your reasoning. I generally don’t care much for Q/A right/wrong style that are a function of rote memorization, but rather, I focus on your approach to dissecting issues…
OK without cheating have a go at these; If you look the answers up, the only person you are fooling is yourself:
NETWORK EINGINEER TECHNICAL INTERVIEW:
Be sure to offer explanations in your own words, and not the text book answers verbatim; technical accuracy is not my primary concern; YOUR REASONING IS!!
ENJOY!!!
=>In a deployment of OSPF, a customer seeking your consultancy expertise has mentioned concerns about MTU mismatches in parts of the customer network. How would you go around this kind of an issue, and what would be the potential downsides to the band aids you use to work around the problem, assuming changing the MTU values is not feasible in this caseA?
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=>In what ways does OSPF behave in a distance vector fashion? Explain.
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=>Customer X has two Sites, A and B; that have a direct satellite link shot between Site Aand B for backup, whereas the primary path is an MP-BGP cloud via ISP Z. Site A and Site B both participate in the same OSPF domain, where as the ISP has its own totally independent OSPF IGP that is entirely invisible to both Sites A and B. What measures will enable the direct satellite link to be used to forward traffic ONLY when the MB-BGP cloud is unavailable?
####ANSWER### YADI YADI YADA YADA TYPE HERE…
=>Customer X has got Sites A and B. There exist two paths between Site A and Site B; one is via BGP through the internet via independent ISP connections at each end; the other is a direct link between the two sites using EIGRP. Site A internal network is using major network A/16, while Site B is using Major network B/16 for the same respective purpose. How can the connectivity be setup such tha Site B uses the EIGRP connection as primary path to Site A and the ISP BGP path as a backup, and vice versa for site A towards site B, while the rest of the traffic in either case follows the normal path, with a caveat that the use of the distance command is not permissible and there is no manipulation of prefix lengths for Site A’s/16 and Site B’s /16? Explain how engineers at Site A and Site B to make this setup to work?
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=>Customer X has got Site A and Site B with connectivity between the two sites leveraging MP-BGP with MPLS for transport within the ISP network. Customer X has indicated they would like the respective QoS signalling on either side be honored by the ISP. How would the ISP effect this solution.
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=>The Chief Network Architect for ISP B has been assigned the responsibility of drawing up a game plan to potentially increase revenue, and this with minimal expenditure, and particularly, investment in additional bandwidth should be avoided to minimize costs. The ISP cloud is leveraging MP-BGP with MPLS and analysis has revealed that the bandwidth utilization is not being fully utilized within the current architecture? How would you go about it if you were the Network Architect?
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=>How does OSPF leverage split horizon rules to effect a loop free topology?
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=>Given two possible paths from A towards prefix X, there is a path 1 RIP connections announcing a /24 to reach a remote Z subnet, whereas path 2 is a /16 path EIGRP connection. All else equal which path would be preferred and why?
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=>Verison has a broad expansive ISP MP BGP cloud, which offers connectivity services to smaller ISPs through the use of the Carrier Supprorting Carrier Technological paradigm. Verizon PEs serve as the PE of smaller ISP PE devices(like a dummy CE to the Verizon PE), which in turn provides connectivity to its own customer CE devices. Customer CE1----->ISP PE1------VRF connection**–>Verizon PE1 ------Verison MP-BGP mega cloud--------Verizon PE2----VRF Connection->ISP PE2----->Customer CE2. OSPF is the respective IGP at all relevant points i.e., Verizon ISP Megacloud is using its own OSPF instance, and the respective connections have independent OSPF connectiions where applicable towrds tthe Intermediary ISP, towards Customer CE. What configuration on the Intermediary ISP PE devices would prevent connectivity issues for the Intermediary ISP PE to Verizon Megacloud PE is in a VRF context?
####ANSWER### YADI YADI YADA YADA TYPE HERE…
=>A junior Network Engineer ha spin pointed to the Network Architect that he has observed various instances of “RIB FAILURE” when he looks up the BGP Tables of several WAN routers. What does this mean, and what are the rammifications?
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AAIIIITTT FIRE AWAY!!!..Answer them to the best of your ability without looking up …and if you want real time back and forth just state so and we can as such engage in the comment section.