Question: Flag question: Question 19 Question 19 400,000 pts Which communication service approach is the MOST EFFICIENT? Group of answer choices Ad-hoc Circuit-switched Data-centric Packet-switched Flag

Flag question: Question 19 Question 19 400,000
Flag question: Question 19 Question 19 400,000 pts Which communication service approach is the MOST EFFICIENT? Group of answer choices Ad-hoc Circuit-switched Data-centric Packet-switched Flag question: Question 20 Question 20 400,000 pts Routers and firewalls break up large files into small pieces and attach information to the beginning of every piece. This info is used to ensure the proper transmission and processing of the data. What is this data "envelope" called? Group of answer choices IP Footer IP Header IT Label IT Package Flag question: Question 21 Question 21 400,000 pts The Internet-based service that acts like an "Internet Phone Book" is better known by which acronym? Group of answer choices DNC I DNS DTD DTS

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