What is the difference between TCP and UDP? How do you set the host name on a Nexus device? What is the advantage of subnetting? How do you load a new image on a Cisco router? Name types of fiber connectors. Name devices that you would use to measure fiber. What is the difference between single mode and multimode fiber? You have the following topology: switch - fiber - patch pannel - dark fiber - patch pannel - fiber - 2nd router in a different building; the 1st device has low light level on the receive. How would you troubleshoot? At which layer of the OSI model do switches operate? And the routers? Describe a situation when you had to take a decision without consulting your managers.