71.  What is region?

72.  What is silly window syndrome?

73.  What are Digrams and Trigrams?

74.  Expand IDEA.

75.  What is wide-mouth frog?

76.  What is Mail Gateway?

77.  What is IGP (Interior Gateway Protocol)?

78.  What is EGP (Exterior Gateway Protocol)?

79.  What is autonomous system?

80.  What is BGP (Border Gateway Protocol)?