As an employer, it is extremely frustrating to receive a resume that specifies a degree of expertise - and when interviewed it becomes immediately apparent that he/she has not a clue about the subject.
A recent experience where a candidate claiming to be ready to take his Cisco CCNA exam did not have a clue as to the difference between a switch and a router!
This was not a high level discussion of the functionality of Cisco switches/routers where they can be used interchangeably in certain circumstances - this was in a basic network to network VPN discussion.
Needless to say, the interview ended shortly thereafter - another waste of my time and his because of a totally fraudulent resume...
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