I was in a technical interview yesterday and my interviewer asked me a question:
If you have a single router connected to a private LAN and also connecting to two ISPs (single multihomed design) like this topology:
Assume that the Enterprise Router E1 connected to a LAN (whatever its IP) and running eBGP between each of those ISPs.
How could you route your LAN's UPLOAD traffic via ISP1 and your DOWNLOAD traffic via ISP2?
I told him that my knowledge is just about CCNA R&S and CCNP ROUTE because I thought that this question is very advanced for a CCNP ROUTE certificate holder. He told me that this question is within the CCNP ROUTE syllabus.
I wondered if I can answer this question by CCNP ROUTE knowledge and also wonder how to answer this question by using BGP attributes or by any means?
I hope if someone could help me answering this question.
Thanks in advance.