ANSWER 1. A. Northern Ireland and Republic of Ireland shares 310 miles (499 kilometers) of border area between them with 275 crossing points. Though in 1998, The Good Friday Agreement helped to remove all the security checkpoints and made the hard border invisible.
ANSWER 2. B. One positive way that the boundary has affected, is that; the south people always wanted to distance themselves from the people of north which they often tagged as violent north. The border gave them a sense of relief and freedom which they always desired. They thought themselves to be the civilized ones whereas the north people always made them feel insecure because of their violent nature.
One negative way is that the border between the two countries was very unplanned one. People had problems with partitioned lands, bridges divided between north and south, odd homes,etc. odd homes were the ones where people would have breakfast in north and went to sleep in south and cell phone network would fluctuate between north and south.